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  • 1.
    Blomkvist, Pär
    et al.
    Division of Organization and Management, Mälardalen University, Högskoleplan 1, 722 20, Västerås, Sweden.
    Karpouzoglou, Timon
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History, History of Science, Technology and Environment.
    Nilsson, David
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History, History of Science, Technology and Environment.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Entrepreneurship and alignment work in the Swedish water and sanitation sector2023In: Technology in society, ISSN 0160-791X, E-ISSN 1879-3274, Vol. 74, article id 102280Article in journal (Refereed)
    Abstract [en]

    Water and sewage (WS) systems are, like most grid based infrastructural systems, often centralised and hierarchical and the end user has almost no possibility to influence the technical standards, business models or system architecture. The preferred method for connecting new areas to the grid are underground water pipes and gravity flow for sewage. Thus, the WS system is “tightly coupled”. It is hard to change and conservative in its system culture, exhibiting a strong “momentum” or “path dependence”. In this article we investigate an unusual case in the development of WS-systems. As a rule, WS-systems, as most infrastructural systems, develop gradually through incremental innovations, and system owners/utilities traditionally build their systems “from the inside out”. In our case, we investigate a situation where the end users took the initiative to connect a residential area, Aspvik, part of the municipality of Värmdö, outside Stockholm, Sweden, to the municipal grid and thus expand the WS-system, not from the inside out, but from the outside in. Furthermore, we highlight another unusual feature: the role of a resident that acted as the “entrepreneur” in this process of WS-system expansion. The entrepreneur had unique trust building abilities in the local community, which the regime actor (the WS utility), could not match. Historically, inventor-entrepreneurs have been common, acting as “system builders” in the establishment phase of new infrastructural systems. However, entrepreneurs outside the regime are not common in the WS sector. Although atypical in mature WS systems in developed countries, these types of local initiatives or hybrid solutions are common in developing countries. In this article, we argue that there are lessons to be learnt from our case, when dealing with system expansion processes both inside and outside the Global North.

  • 2.
    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)
  • 3.
    Karpouzoglou, Timos
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History, History of Science, Technology and Environment.
    Blomkvist, Pär
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Golzar, Farzin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Nilsson, David
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History, History of Science, Technology and Environment.
    Silveira, Semida
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy and Climate Studies, ECS.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Winners and losers during transition: the case of urban water and energy systems in Sweden2020Conference paper (Refereed)
    Abstract [en]

    Globally, there is an increasing consensus around the need to realise deep transformations invital sectors of society such as those related to urban water supply and energy, particularly in cities where the largest share of the global population is living. Taking the example of recent changes in energy requirements for buildings in Sweden, the government has proposed that, by 2021, all new houses shall have” near zero” energy demand, which for a multifamily house in Stockholm translates into a primary energy demand of 85 kWh /m2 per year. This has generated a new kind of niche experimentation in the building sector that cuts across traditionally disconnected domains of innovation around water and energy. For example, technologies around greywater re-use and heat recovery from wastewater have become associated with reduction in water use and important energy gains. These innovations propel private users and organisations - notably in the real estate sector - towards new investments as part of realising ambitious energy and water targets. As end-users of networked water and energy services, actors make technology-decisions that save energy, water and reduce their dependence on centralised network providers. But this also causes negative commercial and physical effects on the established networked configurations of water and energy, in the form of reduced economic revenue, less heat circulation, and colder wastewater causing problems in the treatment plants. In our study we focus on the winnersand losers of energy and water transition in Sweden, to learn about how transition in energy and water is evolving and why it is being negotiated along particular trajectories by a range of relevant actors.

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  • 4.
    Madani, Hatef
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Wallin, Jörgen
    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.
    Ventilation heat recovery with run around coil: System analysis and a study on efficiency improvement – Part II2009Conference paper (Other academic)
    Abstract [en]

    In order to improve the system efficiency, a heat pump is retrofitted to a conventional run around coil ventilation heat recovery system.  The present paper aims at evaluating the annual performance of both existing run around coil system and the system to which a heat pump is retrofitted. The paper also makes a comparison between the efficiency of these two systems in two different climatic conditions. Dynamic modeling of the system was carried out over a year, using TRNSYS as the simulation tool and the results were presented for different climatic conditions. Results from the annual modeling shows that by retrofitting a well-designed heat pump unit to the system, there is a potential to increase the amount of the recovered heat up to more than 50%. By considering the energy used by the compressor of the heat pump, it can be concluded that the new system looks promising from the economic point of view and it can lead to save a large amount of energy use and money annually.

  • 5.
    Nilsson, David
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History, History of Science, Technology and Environment.
    Karpouzoglou, Timon
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History, History of Science, Technology and Environment.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Blomkvist, Pär
    Mälardalen University, Division of Organization and Management, Sweden.
    Golzar, Farzin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy Systems.
    Martin, Viktoria
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Is on-property heat and greywater recovery a sustainable option? A quantitative and qualitative assessment up to 20502023In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, Vol. 182, p. 113727-Article in journal (Refereed)
    Abstract [en]

    This article deals with ongoing attempts to recover heat and greywater at property level, based on an in-depth study of Stockholm, Sweden. We explore different socio-technical development paths from now up until 2050 using a novel combination of on-property technology case-studies, actor studies and system-level scenario evaluation, based on Artificial Neural Networks modelling. Our results show that the more conservative scenarios work in favour of large-scale actors while the more radical scenarios benefit the property owners. However, in the radical scenarios we identify disruptive effects on a system level due to disturbance on wastewater treatment plants, where incoming wastewater can be critically low for up to 120 days per year. At the same time, net energy savings are relatively modest (7.5% of heat demand) and economic gains for property owners small or uncertain. Current policies at EU and national level around energy-efficient buildings risk being counter-productive in cases when they push property owners to install wastewater heat recovery technology which, in places like Stockholm, can create suboptimal outcomes at the system level.

  • 6.
    Pasichnyi, Oleksii
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
    Levihn, Fabian
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Sustainability and Industrial Dynamics.
    Shahrokni, Hossein
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Wallin, Jörgen
    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. KTH Royal Inst Technol, Dept Energy Technol ETT, Res Grp Urban Analyt & Transit UrbanT, Brinellvagen 68, S-10144 Stockholm, Sweden..
    Kordas, Olga
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Data-driven strategic planning of building energy retrofitting: The case of Stockholm2019In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 233, p. 546-560Article in journal (Refereed)
    Abstract [en]

    Limiting global warming to 1.5 degrees C requires a substantial decrease in the average carbon intensity of buildings, which implies a need for decision-support systems to enable large-scale energy efficiency improvements in existing building stock. This paper presents a novel data-driven approach to strategic planning of building energy retrofitting. The approach is based on the urban building energy model (UBEM), using data about actual building heat energy consumption, energy performance certificates and reference databases. Aggregated projections of the energy performance of each building are used for holistic city-level analysis of retrofitting strategies considering multiple objectives, such as energy saving, emissions reduction and required social investment. The approach is illustrated by the case of Stockholm, where three retrofitting packages (heat recovery ventilation; energy-efficient windows; and a combination of these) were considered for multi-family residential buildings constructed 1946-1975. This identified potential for decreasing heat demand by 334 GWh (18%) and consequent emissions reduction by 19.6 kt-CO2 per year. The proposed method allows the change in total energy demand from large-scale retrofitting to be assessed and explores its impact on the supply side. It thus enables more precisely targeted and better coordinated energy efficiency programmes. The case of Stockholm demonstrates the potential of rich urban energy datasets and data science techniques for better decision making and strategic planning.

  • 7.
    Pasichnyi, Oleksii
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Kordas, Olga
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
    Data-driven building archetypes for urban building energy modelling2019In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 181, p. 360-377Article in journal (Refereed)
    Abstract [en]

    This paper presents an approach for using rich datasets to develop different building archetypes depending on the urban energy challenges addressed. Two cases (building retrofitting and electric heating) were analysed using the same city, Stockholm (Sweden), and the same input data, energy performance certificates and heat energy use metering data. The distinctive character of these problems resulted in different modelling workflows and archetypes being developed. The building retrofitting case followed a hybrid approach, integrating statistical and physical perspectives, estimating energy savings for 5532 buildings from seven retrofitting packages. The electric heating case provided an explicitly statistical data-driven view of the problem, estimating potential for improvement of power capacity of the local electric grid at peak electric power of 147 MW. The conclusion was that the growing availability of linked building energy data requires a shift in the urban building energy modelling (UBEM) paradigm from single-logic models to on-request multiple-purpose data intelligence services.

  • 8.
    Pasichnyi, Oleksii
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Levihn, Fabian
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.). AB Stockholm Exergi, Sweden.
    Shahrokni, Hossein
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Kordas, Olga
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Energy performance certificates — New opportunities for data-enabled urban energy policy instruments?2019In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, p. 486-499Article in journal (Refereed)
    Abstract [en]

    Energy performance certificates (EPC) were introduced in European Union to support reaching energy efficiency targets by informing actors in the building sector about energy efficiency in buildings. While EPC have become a core source of information about building energy, the domains of its applications have not been studied systematically. This partly explains the limitation of conventional EPC data quality studies that fail to expose the essential problems and secure effective use of the data. This study reviews existing applications of EPC data and proposes a new method for assessing the quality of EPCs using data analytics. Thirteen application domains were identified from systematic mapping of 79 papers, revealing increases in the number and complexity of studies and advances in applied data analysis techniques. The proposed data quality assurance method based on six validation levels was tested using four samples of EPC dataset for the case of Sweden. The analysis showed that EPC data can be improved through adding or revising the EPC features and assuring interoperability of EPC datasets. In conclusion, EPC data have wider applications than initially intended by the EPC policy instrument, placing stronger requirements on the quality and content of the data.

  • 9.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Case studies of four installed wastewater heat recovery systems in Sweden2021In: CASE STUDIES IN THERMAL ENGINEERING, ISSN 2214-157X, Vol. 26, article id 101108Article in journal (Refereed)
    Abstract [en]

    The energy demand for tap water heating is significant in the developed world and significant to buildings energy performance. However, little attention is given to this untapped potential of heat recovery from wastewater. The purpose of this investigation is to investigate performance of different wastewater heat recovery systems to obtain more knowledge on how these systems perform in reality. Four systems were investigated showing that the annual heat recovery ratios between 17 and 43% and annual heat recovery per heat transfer areas between 1586 and 13 108 kWh/m(2). The paper also proposes a design equation with a validated accuracy of +/- 15% for sizing horizontal wastewater heat exchangers in wastewater heat recovery systems.

  • 10.
    Wallin, Jörgen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Investigating Different Opportunities to Increase Energy Efficiency in Buildings by Retrofitting Heat Pump Coupled Heat Recovery Systems2014Doctoral thesis, comprehensive summary (Other academic)
  • 11.
    Wallin, Jörgen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Bastien, Diane
    Claesson, Joachim
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    The influence of energy conservation on the performance of solar thermal systems - A cold country case study2012In: 1st International Conference On Solar Heating And Cooling For Buildings And Industry (SHC 2012), Elsevier, 2012, p. 1069-1078Conference paper (Refereed)
    Abstract [en]

    The European Union has set a goal that the energy use in the built environment shall be reduced by 41 % to the year 2050 compared to 2005-2006. This could introduce new opportunities for solar thermal systems in cold countries. In such countries, like Sweden and Canada, the economy in solar thermal collector installation projects is often spoiled by the fact that most of heating energy demand of the building occurs during periods when the available solar energy is low. The present paper investigates the performance of solar thermal systems subjected to different quota between space heating and domestic hot water demand (DHW). This study investigates the performance of a solar thermal system integrated to four different buildings with varying heating loads in two different locations, Sweden and Canada. Models of single family houses are created which are able to simulate the total heating demand with different heating demand profiles but the same DHW demand. Simulations are performed in TRNSYS, an advanced tool used to simulate transient systems. Results indicate that solar combisystems tend to generate more useful energy and therefore be more cost effective when installed in buildings with higher heating demands.

  • 12.
    Wallin, Jörgen
    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.
    Analyzing the efficiency of a heat pump assisted drain water heat recovery system that uses a vertical inline heat exchanger2014In: Sustainable Energy Technologies and Assessments, ISSN 2213-1388, E-ISSN 2213-1396, Vol. 8, p. 109-119Article in journal (Refereed)
    Abstract [en]

    The purpose of the present study is to accumulate knowledge on how a drain water heat recovery system using a vertical inline heat exchanger and a heat pump performs under different drain water flow profile scenarios. Investigating how the intermittent behavior of the drain water influences the performance for this type of system is important because it gives insight on how the system will perform in a real life situation. The scenarios investigated are two 24. h drain water flow rate schedules and one shorter schedule representing a three minute shower.The results from the present paper add to the knowledge on how this type of heat recovery system performs in a setting similar to a multi-family building and how sizing influences the performance. The investigation shows that a heat recovery system of this type has the possibility to recover a large portion of the available heat if it has been sized to match the drain water profile. Sizing of the heat pump is important for the system performance; sizing of the storage tank is also important but not as critical.

  • 13.
    Wallin, Jörgen
    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.
    Improving heat recovery using retrofitted heat pump in air handling unit with energy wheel2014In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 62, no 2, p. 823-829Article in journal (Refereed)
    Abstract [en]

    The world is facing a challenge to reduce energy use to meet the environmental goals set for the future. One factor that has a great impact on the energy performance of buildings is the ventilation losses. To handle these losses, heat recovery systems with rotating heat exchanger are often implemented. These systems have been shown to recover about 60-70% of the energy in the exhaust air on an annual basis. After a heat recovery system is installed it is hard to improve the efficiency of the installed recovery system with an acceptable economic payback period. In the present paper one way to improve the energy performance of a building with this type of heat recovery system by the use of a heat pump is investigated by simulations in TrnSys. The heat pump system is arranged so that the evaporator is connected to a heat exchanger mounted in the exhaust airstream after the energy wheel, and the condenser of the heat pump is mounted so that the temperature of return water from the heating coil is increased. The simulations show that there is a possibility to increase the heat recovery rate of the air handling unit in a significant way by retrofitting a heat pump to the system.

  • 14.
    Wallin, Jörgen
    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.
    Investigating the Efficiency of a Vertical Inline Drain Water Heat Recovery Heat Exchanger in a System Boosted with a Heat Pump2014In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 80, p. 7-16Article in journal (Refereed)
    Abstract [en]

    In the present study, the performance of a vertical inline drain water heat recovery heat exchanger is investigated. The system recovers the heat with the aid of a heat pump. To produce quality measurement data for the analysis special attention have been given to the calibration of sensors and the analysis of the propagation of uncertainty. The results from the analysis of the heat exchanger reveal that the contact resistance between the two copper pipes and the heat resistances on the inside of the drain water pipe are the dominating resistances to the heat transfer. Investigation of the heat recovery ratio shows that the heat exchanger has the capability to recover more than 25% of the available heat in the drain water at the flow rates investigated.

  • 15.
    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)
  • 16.
    Wallin, Jörgen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Knutsson, Jesper
    Karpouzoglou, Timon
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History, History of Science, Technology and Environment.
    A multi-criteria analysis of building level graywater reuse for personal hygiene2021In: Resources, Conservation & Recycling Advances, ISSN 2667-3789, Vol. 12, p. 200054-200054, article id 200054Article in journal (Refereed)
  • 17.
    Wallin, Jörgen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Madani, Hatef
    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.
    Run-around coil ventilation heat recovery system: A comparative study between different system configurations2010In: ICAE 2010 – International conference on Applied energy – Singapore 21‐23 April 2010, 2010Conference paper (Refereed)
    Abstract [en]

    The energy performance of buildings with considerable annual heat load is dependent on the ventilation air change rates (ACH). Buildings utilized for commercial use often have high ACH and therefore high annual heat load. In order for these buildings to have a reasonable energy performance a heat recovery system is often used to recover heat from the extraction air to the makeup air. There are different variations of these systems; one that is frequently used in Sweden is a run around coil heat recovery system.

    The present paper summarizes the findings from the previous studies, and presents a comparative study, for three different cases; the traditional run-around coil heat recovery system; with a three stage on/off controlled heat pump retrofitted into the system; and with a variable capacity heat pump retrofitted into the system.

    Annual modeling shows that by retrofitting a well-designed 3 stage heat pump to the system the annual heat recovery rate for the Stockholm Case can be increased from 47 % to 65 %. For the retrofitted variable capacity heat pump the numbers for the Stockholm Case is an improvement of annual heat recovery from 47 % to 66 %.

    The modeling also shows that a well designed variable heat pump can cover 81 % of the ventilation heating demand and a well designed multi stage heat pump 77 % of the demand.

    Download full text (pdf)
    Run-around coil ventilation heat recovery system: A comparative study between different system configurations
  • 18.
    Wallin, Jörgen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Madani, Hatef
    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.
    Run-around coil ventilation heat recovery system: A comparative study between different system configurations2012In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 90, no 1, p. 258-265Article in journal (Refereed)
    Abstract [en]

    The energy performance of buildings in cold climates, with a considerable annual heating demand, is dependent on the ventilation air change rates (ACH). Buildings utilized for commercial use often have high annual ventilation heating demand due to high ACH required from indoor air quality aspect. In order for these buildings to have a reasonable energy performance a heat recovery system is often used to recover heat from the exhaust air to the makeup air. There are different variations of these systems; one that is sometimes used in Sweden is a run around coil heat recovery system. The present paper summarizes the findings from previous studies [5-7], and presents a comparative study, for three different cases; the traditional run-around coil heat recovery system; with a three stage on/off controlled heat pump retrofitted into the system; and with a variable capacity heat pump retrofitted into the system. Annual modeling (using TRNSYS) shows that by retrofitting a well-designed 3 stage heat pump to the system the annual heat recovery rate for the Stockholm case can be increased from 47% to 65%. For a retrofitted variable speed capacity heat pump for the Stockholm case the annual heat recovery improves from 47% to 66%. The modeling also shows that a well designed variable speed heat pump can cover 81% of the total ventilation heating demand and a well designed multi stage heat pump 77% of the total ventilation heating demand.

  • 19.
    Wallin, Jörgen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Madani, Hatef
    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.
    Ventilation heat recovery with run around coil - System analysis and a study on efficency improvment - Part I2009In: Ashrae - Symposium on “Sustainability and Green Buildings”, October 5, 2009, KUWAIT, 2009Conference paper (Refereed)
    Abstract [en]

    A run around coil ventilation heat recovery system is analyzed in order to identify important performance factors. The aim of this investigation was to find the factors that influence the system performance, with focus on the brine side of the system. A test rig was built to provide measurements for the evaluation of the system behavior during different operating conditions. Results from measurements and calculations are presented.  Three significant factors that affect system efficiency have been identified, the brine flow rate, the concentration of glycol and the charge (pressure) of the system. In addition suggestions on possible further analysis are presented to the reader. It is also concluded that for many existing systems, the heat transfer resistance may be considered to be approximately constant throughout the year even considering the fact that the outdoor temperature changes significantly.

    Download full text (pdf)
    Ventilation heat recovery with run around coil: System analysis and a study on efficiency improvement – Part I
  • 20.
    Wallin, Jörgen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Madani, Hatef
    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.
    Ventilation heat recovery with run around coil: System analysis and a study on efficiency improvement – Part I2009Conference paper (Refereed)
    Abstract [en]

    In order to improve the system efficiency, a heat pump is retrofitted to a conventional run around coil ventilation heat recovery system.  The present paper aims at evaluating the annual performance of both existing run around coil system and the system to which a heat pump is retrofitted. The paper also makes a comparison between the efficiency of these two systems in two different climatic conditions. Dynamic modeling of the system was carried out over a year, using TRNSYS as the simulation tool and the results were presented for different climatic conditions. Results from the annual modeling shows that by retrofitting a well-designed heat pump unit to the system, there is a potential to increase the amount of the recovered heat up to more than 50%. By considering the energy used by the compressor of the heat pump, it can be concluded that the new system looks promising from the economic point of view and it can lead to save a large amount of energy use and money annually.

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