An experimental performance study on VCR system with 100g R600a/R290 refrigerant mixture and 100g R600a (pure isobutene) as drop in replacement of R134a was conducted . continuation running tests were performed under different length of capillary for R600a/R290 & R600a. The result showed that the hydrocarbon mixture (R600a/R290) had highest COP at L=10 feet length capillary by17.35% -23.5% for ...

The use of refrigerant mixtures in refrigeration machines has been proposed in the technical literature. Some but not all of the arguments for and against the use of mixtures as refrigerants are examined in this study. An issue associated with use of blends is the segregation on leakage and the ensuing loss in capacity and performance change on repeated recharging with the original mixture. We ...

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 st...

Cooling of datacenters is estimated to have an annual electricity cost of 1.4 billion dollars in the United States and 3.6 billion dollars worldwide. Currently, refrigerated air is the most widely used means of cooling datacenter’s servers, which typically represents 40e45% of the total energy consumed in a datacenter. Based on the above issues, thermal designers of datacenters and server manuf...