The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternatives replace conventional R134a, which can be beneficial for climate change. Most the experimental and numerical investigations have been conducted explore water, carbon dioxide R134a as working fluids. Hydrofluoroolefin (HFO) refrigerants blends considered most environment-friendly Chloro...

This paper presents environment friendly refrigerant R290 as a solution to the environmental concerns like depletion of ozone layer and rise in global warming because of wide use of synthetic refrigerants R22 and R134a. The water cooler is the widely used refrigeration application in warm climatic countries. Refrigerant R22 and R134a are predominantly used refrigerants in water cooler refrigera...

The use of new generation refrigerants in heating and cooling systems operating according to vapor compression cycles the preference renewable energy sources is very important reduce negative effects on environment. Here, exergy performance refrigerant R450A R1234ze, which are alternatives R134a, were theoretically examined. Energy analysis system performed under same working conditions (source...

In this work, the inversion scheme was used to determine the potential energy surfaces of five polar refrigerant mixtures. The systems studied here are R123-R134a, R123-R142b, R123-R152a, R142b-R134a, and R142b-R152a. The low-density transport coefficients of the refrigerant mixtures were calculated from the new invert potentials by the classical kinetic theory. The viscosity coefficient, binar...

A comparison of the start-up cooling capacities for an automotive R744 and an automotive R134a air conditioning system is presented. It is shown that development of the cooling capacities during start-up can be described with one correlation for both systems. The comparison of the cooling capacities and the redistribution of refrigerant mass during start-up suggest a strong relationship between...

A cold room assisted vapor-compression refrigeration cycle is dynamically modeled in a year and optimized. Total annual cost (TACO) and coefficient of performance (COP) are selected as two objective functions. Both cold room and refrigeration cycle parameters are considered as design variables. Moreover, three working fluids included R22, R134a and R407c are examined. The optimum Pareto front r...

The ground source heat pump heating system is considered as one of the best solutions for transition towards green under continental climate conditions like Kazakhstan. In this paper, experimental and theoretical investigations were carried out to develop a pump-based weather in Kazakhstan evaluate its thermodynamic performance. water-to-water system, integrated with exchanger used refrigerant ...

In recent years, ejectors have received much attention because of their ability to reduce throttling losses and increase the efficiency of stationary and mobile air-conditioning systems. While much of the initial research was carried out with high pressure fluids, such as carbon dioxide, it was soon discovered that ejectors can also offer significant advantages in systems that utilize low press...

Two-phase ejectors have been gaining increased attention in recent years due to their ability to directly improve the COP of the cycle. Of common interest in two-phase ejector studies is how the ejector improves cycle COP. However, less emphasis is often given to the performance of the two-phase ejector itself. The amount of COP improvement offered by an ejector cycle is very strongly influence...