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Energy Analysis of a Low-Temperature Heat Pump Heating System in a Single-Family House
KTH, Superseded Departments, Energy Technology.
KTH, Superseded Departments, Energy Technology.
2004 (English)In: International journal of energy research (Print), ISSN 0363-907X, E-ISSN 1099-114X, Vol. 28, no 1, 1-12 p.Article in journal (Refereed) Published
Abstract [en]

 Energy costs and environmental concerns have made energy optimisation a viable option for buildings. Energy-efficient heating systems together with an effective use of buildings thermal mass and tightness have a significant impact on the energy requirement and on the possibility for sizeable running cost savings. In this study we use the simulation tool TRNSYS-EES to model and analyse the performance of a residential house and the low-temperature heating system that serves its thermal needs. The building is a single-family house with controlled ventilation and the chosen heating system is a hydronic floor heating system connected to an exhaust air heat pump. The aim of the simulation is to study the performance of the building, the heating system and the controls in an integrated manner. Overall, the results indicate that the energy efficiency issue implicates system design and system thinking concerns as well as techno-economic difficulties. Them controls and the choice of the operation mode are of a great importance.

Place, publisher, year, edition, pages
2004. Vol. 28, no 1, 1-12 p.
Keyword [en]
heat pump, floor heating, exhaust air, tight building construction, ventilation, controls, simulation, co-solving
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-5307DOI: 10.1002/er.947ISI: 000188544100001Scopus ID: 2-s2.0-0442312924OAI: oai:DiVA.org:kth-5307DiVA: diva2:8379
Note
QC 20100913Available from: 2005-06-07 Created: 2005-06-07 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Modelling the dynamics of domestic low-temperature heat pump heating systems for improved performance and thermal comfort: a systems approach
Open this publication in new window or tab >>Modelling the dynamics of domestic low-temperature heat pump heating systems for improved performance and thermal comfort: a systems approach
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The present environmental concerns and the rising human requirement for solutions with better comfort and lower costs have resulted in an increased awareness for the energy use in the built environment. Technical advances in building structural systems and materials, heating and other comfort-providing systems and controlling strategies all lead to the integration of building technology with the function of buildings and the aesthetics. Therefore, in the process of improving the performance of energy systems and increasing the energy efficiency, integrated system approaches are of high importance. Performing the necessary energy analysis before any construction-installation occurs can help designers and decision makers reach guided solutions. Hence, a broad range of calculation tools for evaluating the operation of energy systems and the controls in buildings have been developed the latest years with different levels of complexity and angles of focus.

However, research and development regarding holistic energy system designs and techniques are in their infancy. The standard tactic has been to isolate system parts, study them as stand-alone sub-systems and focus on optimising components or processes of a complex function. In the present study, it is demonstrated the necessity for uniting energy engineers, architects, installers and technicians regarding decision making upon the energy use for heating, ventilation and air-conditioning (HVAC) in the built environment. Systems approach has been employed for studying the research issue that is presented in the current thesis. An extended part of this treatise has been devoted to systems thinking in practice.

The thesis demonstrates systematic methods of modelling and analysing certain, integrated, domestic, HVAC applications. The reference system boundaries enclose the building as a construction and as a dynamic function, a comfort-providing system based on a heat pump, a low-temperature hydronic heat distribution system and controls in a residential application. Obviously, these are not the only components met in a hydronic heating system. Numerous pieces of equipment, as piping, circulating pumps, expansion tanks, zone valves, relief valves and other essential elements are needed to make a safe and functional heating system. However, this study focuses on the analysis of the chosen reference system. Several models have been developed in the computational tools of TRNSYS and EES. These tools have been employed because they allow co-solving, hence the integrated system as well as the interaction between the different parts of the system can be studied.

The foremost result of this study is that approaching the system as a whole provides a better picture of the operation of every system component and the interaction between them. Explanations are given for the parameters that have a significant impact on the system’s performance. The thesis shows the importance of factors that are not easy to predict, as well as the difference in the building’s behaviour under fast changing thermal loads when the incorporated thermal mass is altered. Finally, implementing sophisticated controls for reducing the energy costs without compromising thermal comfort is vital.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 131 p.
Series
Trita-REFR, ISSN 1102-0245 ; 05:46
Keyword
Technology, heat pump, domestic heating and ventilation, low-temperature hydronic heat distribution, systems approach, integration, simulation, energy efficiency, TEKNIKVETENSKAP
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-269 (URN)91-7178-018-1 (ISBN)
Public defence
2005-06-14, Sal M3, Brinellvägen 64, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101008Available from: 2005-06-07 Created: 2005-06-07 Last updated: 2010-10-08Bibliographically approved

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