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Operating performances of an ASHP unit operated in a mild and humid region using tube-encircled photoelectric sensor based defrosting initiation strategy.
- Source :
-
Energy & Buildings . Oct2018, Vol. 177, p140-153. 14p. - Publication Year :
- 2018
-
Abstract
- Highlights • The TEPS defrosting initiation strategy was applied to mild and humid regions. • Five short-term and two long-term field test cases were conducted. • The TEPS defrosting initiation strategy was compared to the TT initiation strategy. • The use of TEPS strategy led to more accurate and reliable defrosting initiation. • The use of TEPS strategy led to better operating performances of ASHPs. Abstract A defrosting initiation strategy based on tube-encircled photoelectric sensors (TEPS) was previously proven effective for enhancing the frosting-defrosting performances of air source heat pumps (ASHPs) in cold and dry regions. To verify its applicability to, and evaluate the energy-saving potential when using the TEPS-based strategy in mild and humid regions, field tests were conducted in Guiyang City, China, where the outdoor averaged air temperature and relative humidity were 4.5 °C and 80% in winter, respectively. Two ASHPs of the same-make, one with the TEPS-based strategy and the other with the commonly used temperature-time (TT) strategy, were tested. Totally, seven test cases were organised. Cases 1–5 were for short-term tests to verify the technical feasibility of TEPS-based strategy by comparing the defrosting accuracy of the two strategies. Cases 6–7 were for long-term tests to validate the reliability and effectiveness of the TEPS-based strategy by comparing two ASHPs' operating performances. The test results demonstrated that the use of TEPS-based strategy in mild and humid regions can initiate defrosting more accurately, reliably and efficiently, and thus improve the COP and heating capacity by 11.3% and 12.1%, respectively, compared to the use of the TT strategy. Therefore, it was proven that the TEPS-based strategy was more effective for the ASHPs used in mild and humid regions, for a more accurate defrosting initiation and higher energy efficiency. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTOELECTRIC effect
*HEAT pumps
*ARID regions
*HUMIDITY
*ATMOSPHERIC temperature
Subjects
Details
- Language :
- English
- ISSN :
- 03787788
- Volume :
- 177
- Database :
- Academic Search Index
- Journal :
- Energy & Buildings
- Publication Type :
- Academic Journal
- Accession number :
- 131901805
- Full Text :
- https://doi.org/10.1016/j.enbuild.2018.07.054