Feasibility of using near‐azeotropic refrigerant mixture R290/R1234ze(E) as substitute for R22

Abstract

The flammability and explosiveness are the disadvantages of the application of R290 practically as an alternative refrigerant of R22. However, adding flame‐retardant R1234ze(E) to R290 can make up for those shortcomings. The refrigerant mixture R290/R1234ze(E) with mass ratio 55%:45% (coded RC01) was proposed to replace R22. The data of RC01 were obtained by calculating using the refrigerant software REFPROP9.1. The environmental impact indexes, temperature glide characteristics, thermodynamic and thermophysical properties, theoretical thermodynamic cycle performances, safety, and lubrication properties of RC01 were analyzed and compared with that of R22, R410A, R407C, R290, R1234ze(E), respectively. The results show that the RC01, with the ozone depletion potential of 0 and global warming potential of 12, is a near‐azeotropic refrigerant whose glide temperature is approximately 0, and it has better thermodynamic and thermophysical properties as well as theoretical thermodynamic cycle performances. The RC01 also has good lubrication characteristics and low flammability. So it is technically feasible to replace R22.

Increasing the efficiency of liquefied natural gas production plant with considering appropriate refrigerant components

“…[8][9][10] These processes are counted as costly processing industries because the energy and equipment are very expensive. 11,12 The main part of these costs includes their refrigeration system and the consumption capacity of compressors. 12 Thus, the important parameters in these processes are dealt with the optimum designing of the refrigeration system (from the amount of energy consumption) and investment costs.…”

“…11,12 The main part of these costs includes their refrigeration system and the consumption capacity of compressors. 12 Thus, the important parameters in these processes are dealt with the optimum designing of the refrigeration system (from the amount of energy consumption) and investment costs. For this reason, refrigeration systems are highly deliberated in cryogenic processes.…”

“…They could specify the optimum operational conditions for this process. 12 Gong et al, dissected the advantages and disadvantages of expanded and mixed refrigerant cycles in equal conditions. Then, they optimized these processes.…”

“…However, the methods of producing LNG are generally divided into two groups: in this method, compressing and expanding are applied without an external refrigerant to change natural gas into liquid 8–10 . These processes are counted as costly processing industries because the energy and equipment are very expensive 11,12 . The main part of these costs includes their refrigeration system and the consumption capacity of compressors 12 .…”

Performance, environment, and cost‐benefit analysis of a split air conditioning unit usingHC‐290 andHCFC‐22

“…Apart from the performance of HC-290 in AC unit, it is very important to identify its oil solubility and compatibility with HC-290, the compressor's tribology and flammability aspects in case of HC-290 leakage. 20 Wang et al 21 used 3GS and 4GS mineral oils in HC-290 unit to find the optimum oil circulation ratio (OCR). The results showed that the optimum OCR was found to be 2% and 4% for 3GS and 4GS oils.…”