Running a refrigeration cycle at saturated liquid conditions at the evaporator inlet has a few interesting advantages in comparison to the conventional 2-phase situation. Opportunities in using novelty heat exchangers, increased cycle efficiency and significantly reduced main compressor sizes occur. Using the two rotor integrated compressor/expander idea developed by Olofsson (1993) in a refrig...

This study conducts a parametric based on the energy and exergy analysis of combined cycle composed an organic Rankine dual evaporator cooling cycles. The mechanical power supplied provides compression refrigeration with two evaporators. influence operating temperature, including impact temperature effect were investigated; in this case, three fluids employed such as R134a, R290, R600. results ...

Objective . With the decreasing use of refrigerants with a high global warming potential, increasing efficiency refrigeration machines using natural working fluids is very urgent task. The CO2 booster refrigerant cycle may be optimal for fields commercial refrigeration, climate engineering and heat pumps, but needs to adapted regions hot climates. purpose study also systematize possible ways im...

Due to their contribution to the ozone depletion and the anthropogenic greenhouse warming effect caused by the refrigerant as well as the foam blowing agent household refrigerators and freezers were attracting public attention especially in Western Europe. The conversion to the use of environmentally benign fluids as refrigerants and foam blowing agents requires a large number of extensive, exp...

Centrifugal compressors are most widely used in large capacity refrigeration and air conditioning plants. Its other applications include in gas turbines for air craft applications, diesel engine turbochargers, chemical and process industries, factory workshop air supplies etc. In refrigeration field these are suitable for high specific volume refrigerants or low pressure stages. They have been ...

Nowadays around 46% of food production the world requires refrigeration, which is generally provided either by active vapour-compression (based on refrigerants with liquid-gas transitions) or passive cold-storage on...

Trans-critical CO2 vapor compression (VC) refrigeration cycles require a high ratio, which is associated with expansion losses. To recover these losses, pressure exchange process between the low- and high-pressure sides of VC cycle proposed examined in this study. The system an open type constant volume where high- low-pressure flows mix inside system. This prototype inspired by exchangers used...

Direct expansion (DX) refrigeration technology is almost exclusively used in multi-temperature transport refrigeration systems. Multi-temperature systems use up to three evaporators, requiring large refrigerant charges and system pressure control to operate over a wide range of set-point conditions. Despite incremental design improvements over the past decade, environmental and control issues c...