Refrigeration is one of the leading uses of electric power in the United States. The term "refrigeration" refers to air-conditioning for homes, businesses, and industry and the operation of refrigerators, freezers, and heat pumps. The technology most often used in refrigeration, the vapor compression cycle, is 100 years old, inefficient, and environmentally unsound. Since the 1980s, the refrige...

Refrigeration is one of the leading uses of electric power in the United States. The term "refrigeration" refers to air-conditioning for homes, businesses, and industry and the operation of refrigerators, freezers, and heat pumps. The technology most often used in refrigeration, the vapor compression cycle, is 100 years old, inefficient, and environmentally unsound. Since the 1980s, the refrige...

In this study, a cascade refrigeration system comprising gas and vapor compression cycles operating at ultra-low temperature was designed. the thermodynamic analyses, R744, R404A, R410A refrigerants in high cycle (HTC), R1150, R170, R23 low (LTC) were used. Thermodynamic analyses carried out using Engineering Equation Solver package program. Outputs considered were: performance(COP), ratio, mas...

This paper presents recent developments and state of the art for transcritical CO2 cycle technology in various refrigeration, air-conditioning and heat pump applications. The focus will be on fundamental process and system design issues, including discussions of properties and characteristics of CO2, cycle fundamentals, methods of high-side pressure control, thermodynamic losses, cycle modifica...

In this study thermodynamic performance analysis of a combined organic Rankine cycle and ejector refrigeration cycle is carried out for use of low-grade heat source in the form of sensible energy. Special attention is paid to the effects of system parameters including the turbine inlet temperature and turbine inlet pressure on the characteristics of the system such as ratios of mass flow rate, ...

The paper focuses on operation of simple refrigeration cycles and considers the selection of controlled variables for two different cycles. One is conventional sub-critical ammonia refrigeration cycle and the other is a trans-critical CO refrigeration cycle. There is no fundamental difference 2 etween the two cycles in terms of degrees of freedom and operation. However, in practical operation t...

The exergetic analysis is a tool that has been used successfully in many studies aiming a more rational energy consumption to reduce the cost of processes. With this analysis, it is possible to perform an evaluation of the overall process, locating and quantifying the degradation of exergy. This paper applies exergy approach for analyzing the heat exchanger network design and refrigeration of M...

This study evaluates the performance of an R744/R404A cascade refrigeration system (CRS) with internal heat exchangers (IHE) in supermarkets. R744 is used as refrigerant a low-temperature cycle, and R404A high-temperature cycle. In previous studies, there are many studies including theoretical analysis CRS. However, experimental on CRS lacking, research IHE scarce. Therefore, this provides basi...

In this study, a boil-off gas reliquefaction system that is part of liquid ethylene (LEG) carriers evaluated. The formed by two thermally interconnected two-stage refrigeration cycles. working fluid the bottoming cycle ethylene; topping propylene. research based on determining irreversibilities in cycles using entropy-cycle method thermodynamic analysis. impact process performance main componen...