Performance Test of a GSHP System with Centrifugal Compressors and Variable Frequency Pumps during the Heating Period
- Key words
- Ground source heat pump; centrifugal compressor; variable frequency pump; coefficient of performance
- Location
- Tangshan, China
- Conference
- Geothermal Resources Council Transactions
- Year
- 2012
- Session
- Geothermal heat pumps
- Language
- English
Abstract
This paper describes the winter performance of a ground source heat pump (GSHP) system with centrifugal compressors and variable frequency pumps. Results showed that the present GSHP system can reach a better operation performance, as compared to a typical GSHP system using screw compressors and fixed frequency pumps. Within the range of 50-100% load ratio, the degradation of COP can be neglected. At a lower operating load ratio of 40-50%, the COP of the whole system can be kept at higher than 3.0. For a much lower operating load ratio of 20-30%, it is difficult to use the present frequency conversion technology to guarantee a high COP. The present results can provide some guidelines for the design of similar large-scale GSHP systems in future.
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