FILM –WISE CONDENSATION OF R1234yf AND R134a REFRIGERANTS ON FINNED TUBE WITH 32 FINS PER INCH
نویسندگان
چکیده
Researchers have been motivating by the global warming challenge to develop alternatives substances compounds that contribute this problem. The refrigerant R134a (HFC134a) has identified as one of most environmentally damaging gases. As a result, R1234yf employed in air conditioning systems substitute R134a. condensation heat transfer coefficient (HTC) refrigerants and was measured on smooth standard finned tubes study. tube is characterized 32 Fins per inch (FPI) 1 mm fin height. process investigated at 37°C 40°C condensing temperatures 16°C 28°C water inlet temperatures. Nusselt theory accurately predicted HTCs within mean absolute percentage deviation (MAPD) 5.3% for 4.7% R1234yf. wall sub-cooling increases, HTC decreases. With drop LMTD, overall rises. For tube, showed greater than In comparison enhancement ratio 78% 37 82% with 65% 81% 40 ° C, respectively. experimental data compared predictions two previous analytical models film tubes.
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ژورنال
عنوان ژورنال: ???? ???? ?????? ????????
سال: 2022
ISSN: ['2305-6932', '2663-1970']
DOI: https://doi.org/10.31185/ejuow.vol10.iss2.303