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Analysis of system improvements in solar thermal and air source heat pump combisystems
Dalarna University, School of Technology and Business Studies, Energy Technology. KTH. (SERC)ORCID iD: 0000-0002-3201-8518
Dalarna University, School of Technology and Business Studies, Energy Technology. (SERC)
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2016 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 173, p. 606-623Article in journal (Refereed) Published
Abstract [en]

A solar thermal and heat pump combisystem is one of many system alternatives on the market for supplying domestic hot water (DHW) and space heating (SH) in dwellings. In this study a reference solar thermal and air source heat pump combisystem was defined and modelled based on products available on the market. Based on the results of an extensive literature survey, several system variations were investigated to show the influence of heat pump cycle, thermal storage and system integration on the use of electricity for two houses in the climates of Zurich and Carcassonne. A singular economic cash flow analysis was carried out and the “additional investment limit” of each system variation was determined for a range of economic boundary conditions. This is the maximum extra investment cost for the system variant compared to the reference system that will give a break even result for a 10 year period. The results show that variations in electricity price affects the additional investment limit far more than the other economic parameters. Several of the variants show potential for achieving a cost benefit, but the potential varies a lot depending on load and climate boundary conditions. For all variants, the biggest difference in electricity savings was found for Zurich rather than in Carcassonne, which is explained by the larger heating load. However, in three cases the largest savings were for the SFH45 house despite the fact that the annual electricity use of the system is much lower than that for the SFH100 house, 3581 kW h/year compared to 8340 kW h/year. This was attributed to the fact that, in these cases, the operating level of the space heating circuit played a significant role, the SFH45 house being supplied with a 35/30 °C heating system while the SFH100 was supplied with a 55/45 °C heating system.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 173, p. 606-623
Keywords [en]
Solar combisystem; Heat pump cycle; Thermal storage; Hydraulics
National Category
Energy Systems
Research subject
Energy, Forests and Built Environments, MacSheep
Identifiers
URN: urn:nbn:se:du-21378DOI: 10.1016/j.apenergy.2016.04.048ISI: 000377235200050OAI: oai:DiVA.org:du-21378DiVA, id: diva2:922155
Funder
EU, FP7, Seventh Framework ProgrammeAvailable from: 2016-04-22 Created: 2016-04-22 Last updated: 2017-11-30Bibliographically 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
National Category
Environmental Engineering
Research subject
Energy, Forests and Built Environments, MacSheep
Identifiers
urn:nbn:se:du-26498 (URN)978-91-7729-526-6 (ISBN)
Public defence
2017-10-09, 14:26
Opponent
Supervisors
Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-06Bibliographically approved

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Poppi, StefanoCialani, Catia

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