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Investigating Control Strategies for a Domestic Low-Temperature Heat Pump Heating System
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2006 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 29, no 4, 547-555 p.Article in journal (Refereed) Published
Abstract [en]

Despite energy conservation regulations and efforts for improving HVAC operations, numerous domestic buildings do not perform energy efficiently and many times the indoor environment is far away from specified comfort levels. Especially in houses served from low-temperature heating systems the low ability of the heating system to respond to fast changing thermal loads is common. In such cases, the implementation of new, sophisticated controls is an important issue. In this study, we use a reference model of a domestic low temperature heat pump heating system developed in TRNSYS-EES and analyse its operation. Several methods of control strategies have been applied for specified time periods in order to keep the comfort within reasonable ranges. Prognostic climatic control and increased ventilation rates when required are some of these methods. The results depict the influence of the control method on the indoor temperature and the comfort indexes of PMV and PPD. The highest indoor temperature difference for a chosen day reaches 4 degrees C when there is no shading and when there is internal shading with the option of applying prognostic climatic control. Generally, the findings highlight the importance of dynamics in controlling functions and the difficulty of incorporating in models unpredictable factors as the solar radiation.

Place, publisher, year, edition, pages
2006. Vol. 29, no 4, 547-555 p.
Keyword [en]
Automatic, Domestic application, Floor, Heat pump, Heating, Modelling, Regulation
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-5310DOI: 10.1016/j.ijrefrig.2005.10.009ISI: 000238333600004Scopus ID: 2-s2.0-33646500970OAI: oai:DiVA.org:kth-5310DiVA: diva2:8382
Note
QC 20100920. Uppdaterad från Submitted till Published (20100920).Available 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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