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Suitable low Global Warming Potential (GWP) refrigerants for two-speed Heat Pumps for residential applications based on speed...

by Moonis R Ally, Bo Shen, Vishaldeep Sharma
Publication Type
Conference Paper
Book Title
International Refrigeration and Air conditioning conference 2021
Publication Date
Page Numbers
1 to 10
Publisher Location
Indiana, United States of America
Conference Name
2020 Purdue Conference
Conference Location
West Lafayette, Indiana, United States of America
Conference Sponsor
Purdue University, Herrick Laboratories and the Center for High Performance Buildings
Conference Date

Cold climate Heat Pumps (CCHPs) using single-speed compressors in tandem have been successfully built and tested to reach its performance metrics with outdoor temperatures as low as -25°C. CCHPs must be designed to alleviate the problems of too high discharge temperatures, low suction pressure and high-pressure ratio at low ambient conditions and insufficient heating capacity relative to the heating capacity at 8.3°C. In this paper we recognize those concerns. Low-GWP refrigerants are screened based on the shape of their T-S saturation boundary. Simulations of the performance of low-GWP refrigerants (R32, R454B, R466A, and R452B) relative to R410A is done using the DOE/ORNL Heat Pump Design Model at the component level. Systemic inefficiency, the root cause of lost work, is addressed by component-level exergy analysis to refine design options. CCHPs using low-GWP refrigerants addresses issues of reducing energy consumption, lowering carbon footprint, and enabling environmentally sustainability. The CCHP was designed to meet a HSPF > 11.0 and SEER > 15.0 having adequate heat pump heating capacity down to -25°C. It is estimated that at least 2.6 million U.S homes using electric furnaces and heat pumps in cold or very old climates with an annual energy consumption of 0.17EJ would benefit by CCHPs.