We use standard thermodynamic relationships to demonstrate the accuracy of new vapor pressure measurements by using them in the calculation ofliquid-phase heat capacities and comparing the results with recently published experimental values. Results for the new alternative refrigerants Rl34a and R 123 are used as examples.

This paper presents the improvement of eco-friendly and power consumption saving refrigerants for refrigeration systems. The novel azeotropic refrigerant mixtures HFCs HCs can replace systems, using R134, R32, R125, R1270 in several compositions found decision tree function RapidMiner software (which came first KDnuggets annual poll). All results are mixed POE, which is A1 classification refrig...

On the basis of available data on use refrigeration units with conventional artificial refrigerants, recommendations CO2 are used when designing refrigerant machines to operate under various external conditions, efficient in terms their thermotechnical, energetic, and performance characteristics. A comparative analysis cycle indicators refrigerating using refrigerants as working substance is gi...

This work presents an energy, exergy, and environmental evaluation of a novel compound PV/T (photovoltaic thermal) waste heat driven ejector-heat pump system for simultaneous data center cooling recovery district heating networks. The uses with evaporative-condenser as driving force ejector while exploiting the generated electric power to operate compressor pumps. vapor compression assessed sev...

This study provides a global warming impact analysis of environmentally friendly refrigerants used as replacements for R134a and R245fa. R290, R1234yf, R1234ze(E), R513A R450A are considered to replace in medium temperature applications. For R245fa, there five alternative refrigerants, R1224yd(Z), R600, R1336mzz(Z), R1233zd(E) R1234ze(Z), which selected high-temperature The is done considering ...

This paper investigates the feasibility of hydrocarbon refrigerant mixtures as a replacement for HCFC-22 in residential air-conditioning and heat pump systems. The COP and the seasonal performance factor (SPF) were calculated using a UA-model for single component refrigerants and refrigerant mixtures. Simulations were run for pure propane and the mixtures of propane/i-pentane, propane/n-butane,...

The experimental investigation of applying refrigerant Rl52a and zeotropes RI52al R22, Rl52al R221 Rl 14 to replacing refrigerant Rl2 is reported in this paper. The operating characteristics have been gotten using R 12, R I S2a, R ISia I R22 and R I 52a I R22 I R I 14 in the household refrigerator. The experimental results have been analysed. It is known that the·energy consumption of the refri...