Field Test Results from Combined Solar Thermal and Air-source Heat Pump Systems with a Special Focus on Defrosting
Open accessAbstract
Three different combined solar thermal and air-source heat pump systems for domestic hot water preparation and space heating in single- and multi-family houses in Germany have been monitored since the beginning of 2012. Through these field test investigations component as well as system performances could be characterized and it was possible to identify errors regarding installation and control of the multiple operation modes. A particular attention was paid to the energetic effort and drop in thermal efficiency due to frosting and defrosting of the heat pump’ evaporator. Furthermore, some of the descriptive parameters in the defrosting process (e.g. amount of energy required, work cycle between two defrosting modes) have been put in relation to the prevalent outdoor conditions (temperature, relative humidity). From this analysis the effectiveness of the applied defrosting strategy could be estimated, i.e. to which extent defrosting operation was initiated at the ideal point of time to be needed.
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Solar irradiation and defrosting necessity did not always match.
“concluded that the solar irradiation and defrosting necessity did not always match.”
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Research works printed but not linked: 4
- Loose A, Bonk S, Drück H. Investigation of solar thermal and heat pump systems – field and laboratory tests. Proceedings of the EuroSun 2012 Conference, September 18th – 20th, 2012, Rijeka, Croatia.
- Hadorn JC. IEA solar and heat pump systems. Solar heating and cooling Task 44 & heat pump programme. Annex 38. Energy Procedia 2012; 30: 125-133. · DOI
- Wang W, Xiao J, Feng Y, Guo Q, Wang L. Characteristics of an air source heat pump with novel photoelectric sensors during periodic frost-defrost cycles. Applied Thermal Engineering 2013; 50: 177-186. · DOI
- Wang W, Xiao J, Guo QC, Lu WP, Feng YC. Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena. Applied Energy 2011; 88: 4470-4480. · DOI · Paper page
Cited by
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Patil, M. S., Seo, J.-H., & Lee, M.-Y. (2017) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2016.11.107 · Cited by 86 · see citing works
- Authors
- Stark, S., Loose, A., & Drück, H.
- Affiliations
- University of Stuttgart (DE)
- Corresponding author
- Stark, Sven
- Venue
- Energy Procedia
- Publisher
- Elsevier BV
- Published
- 2014
- Volume
- 48
- Pages
- 654-663
- ISSN
- 1876-6102 (ISSN-L)
- OpenAlex
- W1970077256
- Cited by
- 10
- References
- 0
- Citations by year
- 2025: 1 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2017: 2 · 2016: 2
- FWCI
- 3.04
- Type
- conference paper
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- Locations
- Energy Procedia (publishedVersion, cc-by-nc-nd)
- Funders
- Bundesministerium für Umwelt, Naturschutz, nukleare Sicherheit und Verbraucherschutz
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Refrigeration and Air Conditioning Technologies
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Solar Thermal and Photovoltaic Systems
- Physical Sciences › Engineering › Building and Construction › Building Energy and Comfort Optimization
- Keywords
- solar thermal systems, air-source heat pump, thawing, domestic hot water, space heating, system efficiency
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