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 ...

Measurements on R600a refrigerators have shown electricity savings over R134a and R12 up to 20%. We propose new parameters which are functions of well known refrigerant properties. These parameters show that R600a has half the leakage, pressure loss and condenser pressure and double the heat transfer coefficient of R12 and R134a explaining the measurements. Use of R600a in small heat pumps and ...

Results: The calculated results show that because of high system pressure for R290 and R134a, R600a is the more suitable working fluid for ORC in terms of expander size parameter, system efficiency and system pressure. In addition, R600a is also the most appropriate working fluid for VCC in terms of pressure ratio and coefficient of performance. R600 and R600a are more suitable working fluids f...

This paper reports on an experimental study evaluating a window air conditioner's performance when R152a/R290/R600/R600a refrigerant mixture (by various mass percentages) is used as possible alternative to R-22. Alternative refrigerants are local, cheap, and environmentally friendly. Unmodified R-22 AC was charged with R152a/R290/R600/R600a. During the experiment, parameters such coefficient of...

This paper presents an analytical evaluation of isobutane (R600a), propane (R290), R134a, R22, R410A, and R32 in a vapor compression system used for comfort cooling applications. The evaluation method was based on a system simulation model that was complimented with an evolutionary computation module for the optimization of refrigerant circuitries in the evaporator and condenser. The evaluation...

In this study, the thermal performance of an internal heat exchanger-organic flash cycle system driven by geothermal water was investigated. The R600a/R601a mixtures were selected as working fluid. effects mole fraction on absorption capacity heater, temperature rise cold fluid in exchanger, net power output, efficiency, and electricity generation costs analyzed. outputs, costs, efficiency simp...

The methods for improving second law efficiency have been considered in this paper by using liquid vapour heat exchanger is investigated in this paper. Detailed energy and exergy analysis of multi-evaporators at different temperatures with single compressor and single expansion valve using liquid vapour heat exchanger vapour compression refrigeration systems have been done in terms of performan...

This paper presents technical assessment of environmentally friendly refrigerants as alternatives to R410A for window air conditioners. The alternative refrigerants that are studied for its replacement include R32, R600a, R290, R1234yf, R1234ze and a mixture of R32 (90% molar concentration) and R125 (10% molar concentration). Baseline experiments were performed on a window unit charged with R41...