Abstract
AbstractThis paper reports an experimental comparison between the use of the refrigerants R409A and R437A in a heat pump unit designed and developed to work with R12. Although the use of both refrigerants in new equipments were abolished in EU and US according the new F-Gas Regulation of EU and SNAP, they still being used as options for R12 in old equipments, especially in developing countries. Both refrigerants were studied for the same test conditions, according to two groups of tests: group A (variation of the heat source temperature) and group B (variation of refrigerant flow rate). The results obtained showed that the R437A presents a higher discharge pressure and a lower discharge temperature. The heating and cooling capacities of both refrigerants were similar, as well as the exergetic efficiency. For the group A of tests the COP of both refrigerants was similar and for the group B of tests the R409A presented an average COP 15% higher. According to the results obtained it is recommended the use of R409A in old equipments (as transition refrigerant) until the acquisition of equipments operating with refrigerants with low-GWP becomes technically and economic feasible.
Highlights
This paper reports an experimental comparison between the use of the refrigerants R409A and R437A in a heat pump unit designed and developed to work with R12
A small capacity heat pump unit operating by direct expansion was used to test both of the refrigerants under study: R409A and R437A
(i) The default water flow rate set across each heat exchanger was mwater = 40 kg h−1; (ii) The compressor was not changed during the entire experimental study; (iii) The dead-state conditions regarded on exergetic performance calculation of the heat pump unit were: T0 = 26∘C and p0 = 0.092 MPa, since they correspond to the thermodynamic conditions of the surrounding environment, i.e., the room conditions where the installation set-up was tested
Summary
Abstract: This paper reports an experimental comparison between the use of the refrigerants R409A and R437A in a heat pump unit designed and developed to work with R12. The presence of CFC compounds stands out in developing countries, according to forecasts published [13, 14] Being as it may, HCFCs compounds continue to be used in most of the vapor compression based refrigeration, air conditioning and heat pump systems in developing countries due to:. There is a lack of information in literature relative to R437A [23] It is still sold by manufactures as the ideal drop-in replacer (of the HFC family) for R12, R409A and other HCFC blends in existing stationary refrigeration systems equipped with reciprocating compressors. Et al [25] explored some low-GWP options to replace the R22 in air-conditioning and heat pump systems for residential and small/medium size refrigeration plants, and included the R437A on the study. Namely the discharge pressure and temperature, the cooling and heating capacity, COP and exergetic efficiency, for a wide range of the heat source temperature (TA) and refrigerant flow rate (mref ) on the system
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