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  • 1.
    Arias, Jaime
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Effektivare butikskyla: Värme ur kylanläggningar samt system med flytande kondensering, Aktiviteter 20062007Report (Other academic)
  • 2.
    Arias, Luis
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Achieving energy efficiency in a hotel-office building under tropical Latin American climatic conditions2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 3.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Adiabatic two-phase flow hydraulic performance in a compact brazed plate heat exchanger2007In: Heat SET: Heat Transfer in Components and Systems for Sustainable Energy Technologies / [ed] Thonon, 2007Conference paper (Refereed)
  • 4.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Beräkningsmetoder för årsvärmefaktor för värmepumpsystem för jämförelse, systemval och dimensionering2010Report (Other academic)
  • 5.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Butiken i kyllabbet på IUC har öppnat2006In: ScanRef, ISSN 0284-0758, no 4, p. 44-47Article in journal (Other (popular science, discussion, etc.))
  • 6.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    CERBOF Projekt no. 72: Utfall och metodutvärdering av energideklaration av byggnader2011Report (Other academic)
  • 7.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    En litteraturstudie om klimatets inverkan på kyleffekt och avfrostningsbehov i livsmedelsbutiker2005Report (Other academic)
  • 8.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Local flow boiling experiments with refrigerant R134a in compact brazed plate heat exchanger2007Conference paper (Other academic)
  • 9.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Performance Evaluation of Combined Heat Sources for Innovative Heat Pumps: Ground Source Combined With an Air Coil, Paper ID 6502013Conference paper (Refereed)
    Abstract [en]

    A significant amount of the Swedish single family houses have installed a ground source heat pump as primary energy source. Many of these installed heat pumps are due for replacement and the new installed heat pumps are generally more efficient. Thus, they extract more heat from the ground at a given heat load of the building. This fact combined with the early “rule of thumb” used by Swedish installers for sizing the borehole length means that many boreholes now are slightly undersized in terms of length.One obvious remedy is to drill some additional meters to the existing borehole. Other alternatives exist to offset this situation as well and two of these are that the borehole is assisted by either a solar collector or an outside air heat collector, similar type used for air-to-air heat pumps. The effect of such a measure is that less energy is extracted from the ground during the heating season, and the heat pump may operate at higher heat source temperatures. In addition, it may prevent or at least delay freezing of the borehole, which may occur late of the heating season for some installations.The present paper investigates the performance of such system and to compare the outcome of these three systems in terms of annual energy extraction rate from the ground. The results indicate that the proposed system indeed may offset the additional heat extraction that a new more efficient heat pump would otherwise cause.

  • 10.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Performance of compact brazed plate heat exchanger operating as condenser in domestic heat pump system: An experimental investigation2005In: International Energy Agency Heat Pump Conference: Global Advances in Heat Pump Technology, Applications, and Markets, 2005Conference paper (Refereed)
  • 11.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Plattvärmeväxlare: Hur kan jag räkna enfasvärmeövergångstal i dessa?2005Report (Other academic)
  • 12.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Plattvärmeväxlare som förångare, jämförelse mellan förångare med och utan fördelningsanordning2002In: Kyla, no 3, p. 41-43Article in journal (Other academic)
  • 13.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    The influence of brine flow on the flow boiling refrigerant heat transfer coefficient in a compact brazed plate heat exchanger2005In: International Journal of Heat Exchangers, ISSN 1524-5608, Vol. 6, no 1, p. 35-54Article in journal (Refereed)
    Abstract [en]

    The present article investigates the heat transfer coefficient on the refrigerant side in an compact brazed plate heat exchanger used as evaporator with different brine flows. The experimental equipment consisted of a test rig, simulating a domestic heat pump. Two different heat loads were tested, 5 kW and 10 kW, which corresponds to approx. 2.5 kW/m2 and 5.0 kW/m 2. The inlet quality to the evaporator was kept within 0.18 - 0.20. The pressure was kept within 2.93 - 2.97 bar(a) and R134a was used as refrigerant. The experiment showed for both heat loads a significant increase in the refrigerant area averaged heat transfer coefficient with increasing brine flow. It may be concluded that the temperature profile on the brine side has a significant influence on the refrigerant area averaged heat transfer coefficient. It is suggested that the higher wall superheat on the refrigerant side near the inlet of refrigerant is enhancing the heat transfer.

  • 14.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Afghani, Mohsen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Palm, Björn
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Influence of large temperature difference in a compact brazed plate evaporator with low overall heat flux2003In: / [ed] J.M. Corberán, R. Royo, 2003, p. 33-37Conference paper (Refereed)
  • 15.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Antin, Karina
    Arias, Jaime
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Utvärdering av värmepumpar som attraktivt del i åtgärder i 50-, 60-, 70-tals inklusive även miljonprogrammet sett ur ett tekno-ekonomiskt perspektiv2010Report (Other academic)
  • 16.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Forsén, Martin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Capacity control of a domestic heat pump: Part 1 – Performance of the heat pump and its components2002Conference paper (Refereed)
  • 17.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Hill, Peter
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Björk, Folke
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Slutrappport - Värmestugan – effektiviseringskoncept av bergvärme/solpanel/energilager - Utvärdering KTH: Diarienummer: 2013-0066552016Report (Other academic)
    Abstract [sv]

    Föreliggande projekt syftar till att utvärdera funktionen på ett bergvärmepumpsbaserat uppvärmningssystem för småhus med korta borrhål. För att kompensera för det korta borrhålet när en ny större och effektivare värmepump installeras har kollektorsystemet (dvs. borrhålssystemet) kompletterats med en solfångare kombinerad luftkonvektor, ”energikollektor”. Energikollektorns syfte är att tillföra energi till värmepumpens kalla sida, så att energiuttaget ur borrhålet inte ökar mot tidigare med den ersatta värmepumpen.

    Systemet har utrustats med flertalet energimätare samt en värmepumpsanalysator som samlar in och lagrar driftdata för systemet. Dessa driftdata visar för en dag i april, 2016, att energiuttaget ur kollektorsystemet via värmepumpen helt har kompensats av tillförd energi från energikollektorn. Dygnets medeltemperatur för detta dygn var 8.6 °C. Detta tyder på att syftet med systemet är uppfyllt och funktionen är den som initialt efterfrågades.

    Långtidsmätningar har inte gått att genomföra än, då installation av själva energisystemet, dvs. Värmestugan, försenats. Det intressantaste för en framtida studie är att se hur mycket energi, på årsbasis, som energikollektorn tillför kollektorsystemet, i förhållande till bortförd energi via värmepumpen. Det kunde noteras för undersökt dygn att temperaturen av vätskan in i värmepumpen signifikant ökade då energikollektorn tillförde energi. Kan detta även noteras sett över en årscykel? Solenergi som tillförs under varma tiden på året måste finnas kvar under uppvärmningssäsongen (dvs. ge en höge kollektorsystemtemperatur).

  • 18.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Palm, Björn
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Boiling mechanism in a small compact brazed plate heat exchanger (CBE) determined by using thermochromic liquid crystals (TLC)1999Conference paper (Refereed)
  • 19.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Palm, Björn
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Discrepancy between calculated and measured superheated area in an evaporator plate heat exchanger2002Conference paper (Refereed)
  • 20.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Palm, Björn
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Performance of a compact brazed plate heat exchanger evaporator run in co-current and counter-current2003Conference paper (Other academic)
  • 21.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Palm, Björn
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Pelletier, Olivier
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    On the influence of geometry on evaporation in compact brazed plate heat exchangers2001Conference paper (Other academic)
  • 22.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Rogstam, Jörgen
    Den fullskaliga testbutiken i miniatyr har öppnat2006In: Kyla+, no 8, p. 41-43Article in journal (Other academic)
  • 23.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Simanic, Branko
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Pressure drop and visualization of adiabatic R134a two-phase flow inside a chevron type plate heat exchanger2003Conference paper (Refereed)
  • 24.
    Claesson, Joachim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Stare, Johan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Bergvärme kombinerat med uteluftkonvektor – Förbättrad SPF i stadsdelar med hög andel bergvärme2014In: KYLA+ Värmepumpar, ISSN 1100-343XArticle in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Att använda en uteluftkonvektor som kompletteringskälla är intressant för de installationer som finns i stadsdelar där avståndet till grannhål är kort. Genom återladdning kan ett nästan balanserat energiuttag ur berget erhållas och därmed nästan ett ”hållbart” energisystem. Projektet har visat att även om det (även för enskilda hål) ges mer gynnsamma förhållanden för konvektorn äts nyttan upp av de ökande driveffekterna för pump och fläkt. Noggrann analys behöver alltså göras innan dylikt system implementeras. För stadsdelar som Bromma kan det dock vara intressant för att dels undvika oväntade stopp av värmepumpen pga. för kalla brinetemperaturer, dels få ett balanserat energiuttag ur berget genom återladdning.

  • 25. Edwards, Deborah
    et al.
    Martinac, Ivo
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Miller, Graham
    Research agenda for innovation in sustainable tourism2008In: Tourism and Hospitality Research, ISSN 1464-2700, Vol. 8, no 1, p. 56-61Article in journal (Refereed)
  • 26.
    Forsén, Martin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Capacity control of a domestic heat pump: Part 2 System modelling and Simulation2002Conference paper (Refereed)
  • 27.
    Galimova, Veronica
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Pétilon, Diane
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Building Efficiency Improvementand Renewable Energy IntegrationProject2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 28.
    Ghasemi, Milad
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Behavior Related Energy Use in Single-Family Homes: A Study on residential houses in Sweden2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Complete overview of energy use in a residential building is depends on many different factors. When analyzing proper and effective ways for energy reducing/conserving systems, often times only technological solutions for households appliances are considered. Human behavior has been shown to be an important factor affecting the overall energy use in the household. Many aspects of energy use are directly connected to user behavior and are affected by how the user utilizes available systems.

    This paper focuses on describing the mean influencing causes of human environmental psychology based on study on a Swedish suburb community, called Fårdala. User behaviors and actions affecting residential energy use are analyzed and presented in form of eleven (11) abstract triggers to households energy use. Finally an energy monitoring system based on the findings are purposed.

    What is found from study on human psychology, shows that human behavior is mainly controlled by three (3) key categories of behavior. Conscious/voluntary behavior, Socio-environmental/cultural based behavior and Systemic/learned behavior. Out of the three, while the last one poses as most influential on behavior related energy use, it is also the hardest to affect and change. To effectively counteract the negative effects of user behavior on residential energy use, energy saving devices should react more accordingly to the users and offer engagement.

    Such a system is an energy monitoring device, which allows for a “double-sided” communication with the user. The user is presented with relevant information about real-time energy use of all of the systems and is able to make changes on the fly. The system should also be able to learn and apply energy saving actions based on user behavior.

  • 29.
    Havtun, Hans
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bohdanowicz, Paulina
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Ch 10: Passive Heating and Cooling Systems2011In: Sustainable Energy Utilisation / [ed] Havtun, H., Bohdanowicz, P., Stockholm: KTH Royal Institute of Technology, 2011, 300, p. 261-272Chapter in book (Other academic)
  • 30.
    Havtun, Hans
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bohdanowicz, Paulina
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Ch 2: Thermal Comfort2011In: Sustainable Energy Utilisation / [ed] Havtun, H., Bohdanowicz, P., Stockholm: KTH Royal Institute of Technology, 2011, 300, p. 7-50Chapter in book (Other academic)
  • 31.
    Havtun, Hans
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bohdanowicz, Paulina
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Ch 3: Heating Demand Calculations2011In: Sustainable Energy Utilisation / [ed] Havtun, H., Bohdanowicz, P., Stockholm: KTH Royal Institute of Technology, 2011, 300, p. 51-82Chapter in book (Other academic)
  • 32.
    Havtun, Hans
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bohdanowicz, Paulina
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Ch 5: Ventilation Requirements2011In: Sustainable Energy Utilisation / [ed] Havtun, H., Bohdanowicz, P., Stockholm: KTH Royal Institute of Technology, 2011, 300, p. 105-124Chapter in book (Other academic)
  • 33.
    Havtun, Hans
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bohdanowicz, Paulina
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Ch 7: Heating Systems, Their Components and Construction2011In: Sustainable Energy Utilisation / [ed] Havtun, H., Bohdanowicz, P., Stockholm: KTH Royal Institute of Technology, 2011, 300, p. 133-172Chapter in book (Other academic)
  • 34.
    Havtun, Hans
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bohdanowicz, Paulina
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Ch 8: Ventilation Systems2011In: Sustainable Energy Utilisation / [ed] Havtun, H., Bohdanowicz, P., Stockholm: KTH Royal Institute of Technology, 2011, 300, p. 173-218Chapter in book (Other academic)
  • 35.
    Havtun, Hans
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bohdanowicz, PaulinaKTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Sustainable Energy Utilisation2011Collection (editor) (Other academic)
  • 36.
    Kuldkepp, Térèse
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Ett mikroklimats påverkan på en byggnads energianvändning2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The idea of profiting from a greenhouse to create a local microclimate around a building is not new, in 1976 such a house was built in Saltsjöbaden outside of Stockholm. The house was built inside a greenhouse, and there are also other examples from both Sweden and abroad. However, this is not a widely spread building solution, and there are only a few buildings that are built in Sweden according to this principle. The idea is that a glass building that encloses an internal building will provide warmer temperatures around the house and as a result the building's heating demand could be reduced. 

    In this thesis a building enclosed in a glass building was simulated in the simulation program IDA ICE 4.21. The model should prove principle and is thus not based on an existing building. The building has been assumed to be an office building that is based in Stockholm. The glass building has no mechanical ventilation, and no supply of heating or cooling. Airing hatches are opened when the temperatures in the microclimate reaches temperatures above the comfort level.

    The results showed that for a building of new built standard, 30 % of the heating demand is reduced, which led to a decrease of 10.6 % of facility energy and a decrease of 6.0 % of the total energy use for the building. On a less insulated building the effect was greater, the heating demand decreased 41.1 %, facility energy decreased by 30.8 % and the total energy use was reduced by 22.9 %. When the windows in the enclosed building have low g-values, as in the case for the building of new built standard, the cooling demand increased with the usage of a microclimate. With the case of windows having a higher g-value, like the less insulated building, even the cooling demand decreased as the microclimate was added.

    A microclimate makes the average temperature per month increase outside the internal building envelope. The increase is larger when the number of hours with sun is higher. During months with virtually no sun at all, the microclimate has only marginally higher temperature than the outside temperature. During a day the temperatures vary much more inside the microclimate, than outside. At night or at other times when there is no sunshine, the temperature is only a few degrees above the outside temperature, but when the sun is out, the differences may be 10 °C – 15 °C between the temperature in the microclimate and the outdoor temperature. The use of various set points for the temperature controlled airing hatches during the summer compared to the rest of the year allows for better utilization of the microclimates potential for saving energy.

  • 37.
    Madani, Hatef
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Lundqvist, Per
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    P5 – Dynamic heat pump system with capacity control2010Report (Other academic)
  • 38.
    Martin, Andrew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Jonsson, Hans
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Martinac, Ivo
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Sustainable Energy Engineering:  An International Master Degree Program2002In: Proc. Engineering in Sustainable Development Conference, October 24th/25th 2002, Delft, The Netherlands, 2002, p. Paper no. 143-Conference paper (Refereed)
  • 39.
    Paillat, Etienne
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Energy Efficiency in Food-Service Facilities: The Case of Långbro Värdshus2011Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Food-service facilities have high energy intensities compared to other commercial buildings due to their energy use for cooking and refrigeration. Assessing the energy performance of such facilities has two main purposes. The first one is to evaluate how efficient food-service facilities are and to compare the results with other similar facilities. The second objective is to get a deeper analysis of the energy uses, what enables an easier identification of the processes whose energy efficiency can be improved. This thesis gives, in a first part, a general methodology of how such an energy performance assessment could be carried out. In a second part, a Swedish restaurant – Långbro Värdshus – is taken as a case study. This case study consists in an analysis of the cooking appliances' energy use and an energy performance assessment of the whole facility. A first result of this thesis is the importance of the definition of the system before to start the assessment. Lack of information about the considered processes or how energy use is estimated makes comparison and benchmarking difficult and potentially irrelevant. A second important aspect that stands out of the study when dealing with energy efficiency is the choice of a meaningful indicator. In the case of food-service facilities the amount of energy used per meal (typically expressed in kWh/meal) seems to be the most appropriate one. As regards the energy efficiency of Långbro Värdshus, it has been estimated at 5.9 kWh/meal when considering the total energy use of the facility and at 4.1 kWh/meal without HVAC systems' energy use. Concerning the cooking appliances, the monitored data of their electricity consumption have been analysed to identify the influence of the heating technology and behaviours on the energy use. It resulted, for example, that replacing two hot plate range tops by a solid top and an induction range top enabled 38 % energy savings. Moreover, training the personnel reduced by 7 % the total energy use of the monitored cooking appliances.

  • 40.
    Palm, Björn
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Effektiva plattvärmeväxlare som förångare i värmepumpar: Vidare studier. Slutrapport2005Report (Other academic)
  • 41.
    Revholm, Johan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Energisimulering av kvarteret Hästskon 9 och 12 med ombyggnad och termiskt akviferlager2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis investigates the viability of a system solution for aquifer thermal energy storage along with new HVAC technical solutions in real estates Hästskon 9 and 12 at a proposed future renovation. It also explores opportunities for certification in the Swedish energy and environmental certification system Miljöbyggnad (Environmental Building) regarding energy consumption, daylight comfort, solar heat load and thermal comfort for the renovation and extension proposal of Hästskon 12 with the goal of the GOLD level.

    By exploiting the aquifer in the properties Hästskon 9 and 12 today, very low energy consumption is achievable with seasonal energy efficiency via chillers for heating and cooling supply of 5.6. The LCC analysis shows that there are energy cost savings for property owner Vasakronan of about 3.65 million SEK per year compared to the current situation, if the described aquifer thermal energy storage solution is used. This gives a payback time of approximately 4.5 years in the investment to be made. Certification in the Miljöbyggnad system for existing buildings is probably possible with the aquifer thermal energy storage, but with BRONZE or possibly SILVER level.

    In the future refurbishment and extension proposal, the property owner adds about 13 000 m² of additional rentable commercial premises and offices. Nevertheless, the energy use of the properties decreases further owing to a seasonal energy efficiency via chillers for heating and cooling supply of 7.0 when the data centre refrigeration equipment for tenant SEB persists with heat recovery on the properties' heating systems, heating and cooling systems are adapted for low heat carrier temperature and high brine water temperature, ventilation systems are designed for low fan electricity demand and high heat recovery rate, glass solutions chosen are based on limited solar radiation and the building envelope is additionally insulated to some extent. Energy cost savings are furthered to 4.8 million SEK per year compared to the current situation.

    Even if the data centre refrigeration equipment for tenant SEB is closed down in a future refurbishment scenario, there is possibility to independently supply the property with its own heat produced by an additional heat pump, which removes the dependence of tenant SEB's data centre for heat supply and yet provides an energy saving of 4.25 million SEK per year compared the current situation. Such a solution will result in specific energy with the BBR 2012 (Swedish building regulations) definition of only about 30 kWh / m² Atemp, year. This figure is much lower than new construction requirements of BBR 2012 and on par with virgin buildings with borehole energy storage system.

    Based on the analysis of the Miljöbyggnad system indicators for energy, solar thermal load, daylight comfort and thermal comfort it is possible to certify Hästskon 12 and 9 in a future refurbishment and extension at GOLD level with some changes in the refurbishment proposal. In order to achieve GOLD level with respect to daylight comfort and solar heat load, special adaptation of the glazing on the S building, M building's facade facing Malmskillnadsgatan, and a large atrium in the H-building is required to let in enough natural light while still providing effective solar shading.

  • 42.
    RIFAI, Nabil
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Monitoring the energy consumption in buildings in B2B sector2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This report discusses the ambition of EDF, a French electricity provider, to offer new services to its customers. With the emergence of the smart grid that will be operational in 2020 in France, there are several opportunities that have to be taken. One of them is to be able to offer a suitable monitoring system to its customer.

    This study tried to emphasize the important aspects and features that are required in such a system. Several solutions that are currently being commercialized in France have been analyzed. A grading has been made according to the technical functionalities and the business models have been analyzed.  Recommendations for EDF have also been made in order to help the company to choose the right monitoring system.

  • 43.
    Sommerfeldt, Nelson
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Demonstrating the significance of microclimate on annual building energy simulations using RadTherm2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Buildings account for over 35% of the energy demand in OECD countries, making them a prime target for improvement. (EIA 2011) To help building owners reduce energy usage, ratings systems such as LEED have been developed. A prerequisite for certification is the demonstration of energy efficiency through computer modeling; however, the complex nature of building energy simulations too often leads to errors of up to 30% (Turner and Frankel 2008). One source of significant error can be the assumptions made of environmental conditions, which are often simplified to speed up simulations.

    To demonstrate the significance of active microclimate modeling, a building energy model combined with a microclimate model has been created in RadTherm, a commercial CAE thermal solver. Simulations are run using Passive House construction in three types of environments, and demonstrate an increase in energy demand over an annual time scale when microclimatic components are included. The increase in demand is less than 1%, however the decrease in radiant heat losses are up to 30%. Using the same methodology with revisions to the building construction and urban geometry, a larger increase in energy demand is expected. 

  • 44.
    Stare, Johan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Bergvärme kombinerat meduteluftkonvektor2014Report (Other academic)
    Abstract [sv]

    I detta arbete har problematiken kring befintliga bergvärmeanläggningar som varit i drift imånga år och är dags att byta ut undersökts. Fokus har varit på en specifik frågeställning, kandet finnas någon nytta med att komplettera befintlig värmekälla (bergkollektorn) med enuteluftkonvektor. Anledningen är de faktum att

    1. Nya värmepumpar är effektivare än gamla.

    2. Ny ”praxis” vid dimensionering gör att värmepumpar väljs relativt större än tidigare.

    3. I en del områden är det väldigt tätt mellan hålen, vilket gör att dessa kan påverkarvarandra.

    En effektivare värmepump använder, vid samma värmeavgivning till huset, mindre elektriskenergi, vilket betyder att större mängd energi tas upp ur hålet. Detta leder till försämradeförutsättningar för effektiv värmepumpsdrift och prestandan för värmepumpen kan blibetydligt sämre än förväntat.I detta arbete har ett stort antal variationer på en nyinstallerad värmepump undersökts för ett(av många möjliga) typiskt hus. Dels har det studerats hur en gammal byts mot ny, ny medkompletterande konvektor och ny med konvektor som även återladdar borrhålet. Även nyvärmepump med avbrottskriterier vid för kall brine samt borrhålsfält har studerats. Dessutomny värmepump dimensionerad enligt ”äldre” praxis, dvs 50 % effekttäckning vid DVUTistället för 70 %.Simuleringarna visar visserligen att konvektor i sig självt, och vid återladdning gervärmepumpen bättre driftsförutsättning, men inte tillräckligt för att kompensera för dedriveffekter som behövs för pump och fläkt som tillkommer vid dessa systemlösningar. Förborrhålsfält blir driftpunkten vid riktigt låga temperaturer, och i dessa fall kan värmepumpenvia styrsystemet stänga av kompressorn. I dessa fall visar sig konvektorn med återladdningsignifikant öka årsvärmefaktorn i förhållande till att inte installera den.Vidare visar simuleringarna att dimensionera den nya värmepumpen efter gammal praxis(50 % effekttäckning) tillsammans med luftkonvektorn och återladdning ger, trots ökatkyleffekt i värmepumpen, en driftpunkt som är jämförbar med den gamla. Det innebär attfinns det från början inga driftstörningar i form av avstängd värmepump har konvektorn medåterladdning den inverkan att problem inte kan förväntas med den nya effektivarevärmepumpen, trots det större momentana effektuttag en ny har.För alla andra fall kommer det nya systemet att betyda kallare energibrunn med risk förframtida driftsproblem.

  • 45.
    Thouvenel, Julie
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Find a modern and quick method to determine the U value and the thermal characteristics of a building envelope using an IR camera2012Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

     

    The overall heat transfer coefficient of a building wall, the U value, is an interesting parameter to deduce the heat loss rate through the wall. The current method to determine this U value is well known, but is requires a lot of time to be performed. In this work a new idea of methodology is presented to get an accurate idea of the U value in a really smaller time, using an IR camera. IR thermography is a non destructive method that is mainly used today to carry out qualitative observations. In this work it is used as a quantitative tool to determine the conductivity of a wall knowing the external heat transfer coefficient. The error obtained on homogeneous and heterogeneous walls are smaller than 10 %, which is accurate enough for a fast measurement. The thermal mass of the wall can also be estimated with errors between 5 and 20 %, but only if the user has a good first guess of the real value. Finally some ideas are proposed when the heat transfer coefficient is not known, leading to less reliable results. More work is necessary to transform it as a usable method in everyday life. A part of the report concerns some attempts done with a simulation of the experiment, leading to no concrete results but it is still presented as it took some time to be studied.

  • 46.
    VIALANEIX, Jeremy
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Energy audits of existing office buildings of the 80’s:On the way of sustainability in France.2012Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
  • 47.
    Wallin, Jörgen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    P22 - Modell för identifiering av lämplig effektivisering av energitekniska system med värmepumpar i befintligt byggnadsbestånd – När/Var/Hur?2010Report (Other academic)
  • 48.
    zhang, shan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Sustainable Building Systems.
    Study of building code and calculation of energy consumption for same building situated in two climates, Chengdu and Stockholm2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This report is aim to compared building standard of Chengdu city and Stockholm, as well as find out the suitable energy-saving scenario for two places. To simulate the total energy consumption of logistics building, energy software named design builder will be introduce to calculate. Some of other analysis will be implemented at the same time, including economic analysis, environment analysis and thermal comfort analysis.

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