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Evaluation of refrigerant mixtures in three different cold-climate residential air-source heat pumps
, Article ASHRAE Transactions, 25 June 2016 through 29 June 2016 ; Volume 122 , 2016 , Pages 63-70 ; 00012505 (ISSN) ; 9781939200464 (ISBN) ; Aidoun, Z ; Eslami Nejad, P ; Sharif University of Technology
Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc
2016
Abstract
This paper addresses the challenge of improving the performance of heat pumps (HPs) in cold-climate conditions by applying refrigerant mixtures. The potential benefits of implementing R-32/CO2 zeotropic refrigerant mixtures in three different residential air-source HPs for cold climates are studied. The cases considered are conventional residential HP, HP with a variable mixture control system, and HP with a variable compressor speed. The seasonal performance of a heating system with these air-source HPs, supplemented with an auxiliary electric heater, is studied in the cold-climate city of Montreal, Canada. To this aim, a detailed screening HP model previously developed is modified and...
Technical assessment of ground-source, air-source, and hybrid heat pumps for single-family buildings in cold climates
, Article 25 June 2016 through 29 June 2016 ; Volume 122 , 2016 , Pages 270-280 ; 00012505 (ISSN) ; 9781939200464 (ISBN) ; Hakkaki Fard, A. M ; Aidoun, Z ; Ouzzane, M ; Sharif University of Technology
Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc
Abstract
This paper discusses a technical comparison of a directexpansion ground-source heat pump (DX-GSHP) and an airsource heat pump (ASHP). To lower the ground heat exchanger size for cost reduction purposes, the system performance of a hybrid system is also evaluated using a supplementary air evaporator combined with the DX-GSHP. Detailed screening models previously developed for ASHPs and DX-GHSPs are first used to compare the seasonal performance of these two options for a residential building in the cold-climate city of Montreal, Canada. Then, the model is adopted for performance evaluation of the hybrid system. Additionally, different parameters including borehole total length and heat pump...