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2205, Page 1 Experimental Assessment on Performance of a Heat Pump Cycle Using R32/R1234yf and R744/R32/R1234yf Sho FUKUDA1*, Hideki KOJIMA2, Chieko KONDOU3, Nobuo TAKATA2, and Shigeru KOYAMA1,4 1 Faculty of Engineering Sciences, Kyushu University Kasuga, Fukuoka, 816-8580, Japan Phone: +81-92-583-7269, Fax: +81-92-583-7833, E-mail: fukuda@phase.cm.kyushu-u.ac.jp 2 Interdisciplinary Graduate School of Engineering Sciences, Kyushu University Kasuga, Fukuoka, 816-8580, Japan 3 Graduate School of Engineering, Nagasaki University Bunkyo-machi, Nagasaki, 852-8521, Japan 4 International Institute for Carbon-Neutral Energy Research, Kyushu University Motooka, Nishi-ku, Fukuoka 819-0395, Japan ABSTRACT This study measures the COPs of R744/R32/R1234yf and R32/R1234yf with GWPs of approximately 300 and 200 under two heating modes in experimentally and analytically, where the heat sink water change temperature 10 K and 25 K. In experiment, COP of Ternary 300 and Binary 300 are comparable to that of R410A. In analysis, COP of Ternary 300, Binary 300 and Binary 200 are higher than that of R410A. Even if temperature glide of zeotropic mixture equal to water temperature change in the heat exchanger, irreversible loss in heat exchanger increases because of lower heat transfer performance of heat exchanger. COP of Ternary 300, Binary 300 and Binary 200 are higher than that of R410A in experiment if compressor is improved and the diameter of connecting pipe and heat exchanger is increased. 1. INTRODUCTION Hydro-fluorocarbons (HFCs) are widely used as refrigerants in air-conditioning and refrigeration systems. At the 1997 Kyoto Conference (COP3), it was determined that the product and use of HFCs should be regulated due to their high global warming potential (GWP). Therefore, several studies related to Hydro-fluoro-olefins (HFOs) have been reported in the past decade. In the above mentioned situation for the air-conditioning and refrigeration systems, recently, R1234yf is nominated as one of the alternates of HFCs, due to its extremely low GWP. The heating capacity of heat pump cycles using R1234yf is, however, expected to be lower than that of R410A currently most used, because of its lower vapor density and latent heat. To achieve performance equal to R410A, much larger unit is required. In the previous studies (Kojima et al., 2015), drop-in experiments on heat pump cycle using mixtures of R1234yf/R32 was carried out; R32 was selected as the second component to increase vapor density and latent heat. It was found that mixtures of R1234yf/R32 were strong candidates for replacing R410A. In this study, adding, to reduce GWP furthermore as maintaining the volumetric capacity, adding R744 to R-32/1234ze(E) was therefore attempted. On other hand, the mixtures of R744/R32/R1234yf and R32/R1234yf are zeotropic and have a temperature change during the phase-change, typically called temperature glide. When the temperature glide is utilized effectively, the irreversible loss or exergy loss in heat exchangers is reduced and the cycle performance is improved (e.g., Jakobs and Kruse, 1978, Kruse, 1981, McLinden and Radermacher, 1987, Swinney et al., 1998). The temperature glide is determined by the composition and pressure of refrigerant mixture. International Refrigeration and Air Conditioning Conference at Purdue, July 16-19, 2012PDF Image | Experimental Assessment on Performance of a Heat Pump Cycle
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