The demand for liquified natural gas grows as it is an energy resource that has more flexible means of transport than non-liquefied gas, and eco-friendly other fossil fuels. This paper focused on comparing five different mixed-refrigerant liquefaction processes to determine which one the most efficient in energetic economic terms four processing scales (20,000 kg/h 2, 4, 8 MTPA feed). Simpler w...

HFC-134a is used as working fluid in refrigerators widely. However, how to improve the efficiency of compressor and refrigerator is major topic in the word. The purpose of this study is aimed at the performance evaluation of compressors with different viscosity of POEs oil. A hermetic reciprocating compressor using HFC-134a as refrigerant was adopted and the experimental investigation was carri...

This paper presents a cost-effective method to increase the COP and utility of a domestic refrigerator using R-134a refrigerant. A cabin was installed on the top of a domestic refrigerator with condenser coils of refrigerator serving as heating coils inside the cabin. Known quantity of water was heated by the condenser coils (due to convection currents) thereby increasing the overall COP of the...

A performance analysis on a vapour compression refrigeration system with various refrigerants mixture of R152a, RE170, R600a, and R290 were done for various mixture ratios and their results were compared with R134a as possible alternative replacement. The results showed that all of the alternative refrigerants investigated in the analysis except R431A, [R 152a (29%), R290 (71%)] have a slightly...

Vapor absorption refrigeration system efficiently could be driven by the low grade renewable heat associated with the exhaust gas from the car engine, and uses the eco-friendly refrigerant, i.e. water. The absorption cycle, however, has not yet obtained much attraction in the automobile application due to its large volume and weight per unit of cooling capacity, which has limited to use. A micr...

In this paper study on refrigeration system designed for low temperature which has Zero-Ozone depleting point better heat transfer characteristic gives greater refrigerant effect. In this paper we study the main function part like compressor, evaporator, refrigerant, fan and motor, Technical Details of the components. Energy is the primary and most universal measure of all kind of work by human...

With the increasing of the environmental concerns, carbon dioxide (CO2) as an alternative refrigerant has been investigated intensively. In this study, the heating performance of a transcritical CO2 heat pump system with a twinrotary compressor was investigated. The transcritical CO2 heat pump with gas injection was tested by varying gas injection ratio and outdoor temperature at the optimum re...

This paper presents the development and validation of a simulation model of an injection scroll compressor that can be used for optimization of a heat pump system for electric vehicles. The modeling considered the effects of refrigerant leakage and suction gas heating. The simulation model solved continuity and energy conservation equations using 4th Runge-Kutta scheme to predict the pressure a...

After almost 20 years of intensive research on magnetocaloric effects near room temperature, magnetic refrigeration with first-order magnetocaloric materials has come close to real-life applications. Many materials have been discussed as potential candidates to be used in multicaloric devices. However, phase transitions in ferroic materials are often hysteretic and a metric is needed to estimat...

The present work deals with thermodynamic analysis of cascade refrigeration system using ozone friendly refrigerants pair R507A and R23. R507A is azeotropic mixture composed of HFC refrigerants R125/R143a (50%/50% wt.). R23 is a single component HFC refrigerant used as replacement to CFC refrigerant R13 in low temperature applications. These refrigerants have zero ozone depletion potential and ...