Thermodynamic Analysis of Fluids for Transcritical Heat Pump Utilizing Low Grade Geothermal Source

Author

Xuenong Qiu ; Jun Zhao

Author_Institution

Sch. of Mech. Eng., Tianjin Univ., Tianjin, China

fYear

2011

fDate

25-28 March 2011

Firstpage

1

Lastpage

3

Abstract

Three working fluids R125, R143a and R32 were analyzed thermodynamically for the transcritical heat pump with low temperature geothermal source as its heat source. The system parameters investigated include coefficient of performance (COP), volumetric heat capacity (Q_v), compressor discharge temperature and the pressure ratio. The results show that Q_v, pressure ratio and compressor discharge temperature all increase with the increase of gas cooler pressures while COP values decrease. COP curve of R125 has a maximum value point. R32 presents better performances with higher COP and Q_v values and lower pressure ratio values, but it shows the highest compressor discharge temperature. R125 shows the lowest compressor discharge temperature values and also the lowest COP value.

Keywords

compressors; cooling; geothermal power; ground source heat pumps; space heating; specific heat; thermodynamics; COP curve; R125 fluid; R143a fluid; R32 fluid; coefficient of performance; compressor discharge temperature; gas cooler; heat source; low grade geothermal source; pressure ratio; thermodynamic analysis; transcritical heat pump; volumetric heat capacity; working fluid; Discharges; Fluids; Heat pumps; Temperature; Water heating;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Engineering Conference (APPEEC), 2011 Asia-Pacific

Conference_Location

Wuhan

ISSN

2157-4839

Print_ISBN

978-1-4244-6253-7

Type

conf

DOI

10.1109/APPEEC.2011.5748692

Filename

5748692