Improvement of compressor efficiency using the alternative refrigerant is demanded strongly to reduce CO2 emission, which causes the global warming. Especially the compressor using in frozen temperature level has long lifetime, and the correspondence to above-mentioned is one of the most important subjects. The scroll compressor is the promising structure to solve this problem. A technical poin...

While most recently electronic cooling studies have been focused on removing the heat from high-power-density devices, the present study also explores means of greatly decreasing the device operating temperature. This is achieved by incorporating a microchannel heat sink as an evaporator in an R134a refrigeration loop. This system is capable of maintaining device temperatures below 55°C while d...

• A new hybrid humidification–dehumidification and air conditioning system is proposed and investigated. • The proposed system keeps the function of the air conditioning system and uses it in water desalination. • The effects of system operating parameters on system performance were evaluated and correlated. a b s t r a c t a r t i c l e i n f o An experimental study of the performance of a hyb...

The vortex tube is an intriguing device that separates an incoming high-pressure fluid stream into a two low-pressure streams. Work interaction during the expansion process causes a temperature decrease in one of the two exit streams, while the other one experiences a temperature increase. The overall expansion process in a vortex tube therefore approaches isentropic rather than isenthalpic exp...

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...

This study focuses on the thermal performance analysis of an organic Rankine cycle powered vapor compression refrigeration for a set working fluids each cycle, also known as dual fluid system. Both cycles are coupled using common shaft to maintain constant transmission ratio one. Eight have been studied and total sixty-four combinations analyzed combined The has performed achieve temperature −1...

The adverse effects of global warming and climate change require critical measures for marine refrigeration technology because its impact on greenhouse gas emissions. A novel transcritical CO2 two-stage compression/ejector cycle shipboard cold chamber is proposed in this research. comparative analysis was conducted between the basic compression equipped with a two-phase ejector considering coef...

Mixed refrigerants are obtained from mixing pure in specific proportions and it is known as mixed refrigerants. Mixture divided into two groups according to their thermodynamic behavior: zeotropic mixtures azeotropic mixtures. In this study, the performance of R410A refrigerant mixture (R125 R32) vapor compression refrigeration cycle was investigated. The coefficients (COP) cooling system under...