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Influence of boundary conditions and component size on electricity demand in solar thermal and heat pump combisystems
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Solar Energy Research Center (SERC), Dalarna University College, Sweden.
2016 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 162, 1062-1073 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Solar thermal and heat pump combisystems are used to produce domestic hot water (DHW) and space heating (SH) in dwellings. Many systems are available on the market. For an impartial comparison, a definite level of thermal comfort should be defined and ensured in all systems. This work studied the influence of component size on electricity demand for a state of the art solar thermal and heat pump system. A systematic series of parametric studies was carried out by using TRNSYS to show the impact of climate, load and size of main components as well as heat source for the heat pump. Penalty functions were used to ensure that all variations provided the same comfort requirements. Two reference systems were defined and modelled based on products on the market, one with ambient air and the other with borehole as heat source for the heat pump. The results show that changes in collector area from 5 to 15m2 result in a decrease in system electricity of between 305 and 552kWh/year. Changes in heat exchanger size for DHW preparation were shown to give nearly as large changes in electricity use due to the fact that the set temperature in the store was changed to give the same thermal comfort in all cases. Decrease in heat pump size was shown to give a decrease in electricity use for the ASHP in the building with larger heat demand while it increased or had only a small change for other boundary conditions. Heat pump losses were shown to be an important factor highlighting the importance of modelling this factor explicitly.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 162, 1062-1073 p.
Keyword [en]
Component size, Heat pump, Simulation, Solar combisystem
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-181438DOI: 10.1016/j.apenergy.2015.10.190ISI: 000367631000092Scopus ID: 2-s2.0-84947999137OAI: oai:DiVA.org:kth-181438DiVA: diva2:900466
Note

QC 20160204. QC 20160205

Available from: 2016-02-04 Created: 2016-02-02 Last updated: 2017-09-15Bibliographically approved
In thesis
1. Solar heat pump systems for heating applications: Analysis of system performance and possible solutions for improving system performance
Open this publication in new window or tab >>Solar heat pump systems for heating applications: Analysis of system performance and possible solutions for improving system performance
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Solar heat pump systems (SHPs) are systems that combine solar energy and heat pumps. SHPs have been investigated for several decades and have been proven to increase the share of renewable energy and reduce electric energy demand in residential heating applications. Many solar thermal heat pump systems have become market-available in recent years; however these systems are still not widely employed in the residential sector. This is due mainly to the high initial costs (investment and installation costs) of solar thermal heat pump systems, which limits their cost-effectiveness. Enhancing cost-effectiveness of solar thermal heat pump systems is necessary for a more effective and broader market penetration.

In this thesis, solar thermal and photovoltaic systems combined with heat pumps for heating applications are treated. The overall aims of the thesis are to: 1) investigate techno-economics of SHPs and 2) investigate possible solutions for improving system performance of a reference solar thermal and heat pump system for residential heating applications.

In the first part of the thesis, the influence of climatic boundary conditions on economic performance of SHPs has been investigated by means of: a) an economic comparison of SHPs found in the relevant literature and b) system simulations of the reference solar thermal heat pump system.

In the second part of the thesis, potential solutions for improving system performance of the reference solar thermal heat pump system with limited change in system’ costs are investigated. A systematic approach was used for investigating cost-effectiveness of the system improvements in the reference system.

Based on results of the cost-effectiveness analysis, some of the investigated system improvements were chosen for being included in the design of a novel solar thermal and air source heat pump system concept. The novel system was designed for a house standard with relatively high operating temperatures (55°C/45°C) in the space heating distribution system and for high space heating demand (123 kWh/m2·year). Finally, the thesis ends with a cost-effectiveness analysis of the novel system.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 88 p.
Series
TRITA-REFR, ISSN 1102-0245
Keyword
Solar heat pump systems, techno-economics, solar thermal, system improvements, cost-effectiveness
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-214552 (URN)978-91-7729-526-6 (ISBN)
Public defence
2017-10-09, Sal F3, Lindstedtvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
MacSheepiNSPiRe
Note

QC 20170918

Available from: 2017-09-18 Created: 2017-09-15 Last updated: 2017-09-18Bibliographically approved

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Citation style
  • apa
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