As the phase-out of chlorofluorocarbons (CFC's) approaches, there is a current need for the development of new vapor compression chillers which can operate with non-CFC refrigerants while still maintaining high operating efficiencies. Redesign of the traditional flooded evaporator used in refrigeration chillers so as to incorporate a spray evaporation capability offers both a potential for incr...

Elastocaloric refrigeration requires refrigerants with a good heat transfer ability and high fatigue life. A million-level life can be normally obtained for NiTi via compressive loading. However, existing compression-based elastocaloric prototypes only focus on tube refrigerants, no research has been reported the cross-sectional geometry design its influence compression behavior of refrigerants...

Increasingly stringent regulations and new applications require selecting improved refrigerants for heat pumps. The selected should be environmentally friendly maximize the performance of pump process. Systematic refrigerant selection methods usually model compressor with one fixed isentropic efficiency identical all refrigerants. However, studies indicate that may highly refrigerant-dependent....

Numerical simulation is extensively used in heat exchanger design and performance evaluation. While evaluating potential working fluids, pure fluids and fluid mixtures with different component combinations and fractions are compared based on simulation results. Two of the challenges while conducting such studies are the uncertainties of refrigerant properties and the applicability of empirical ...

In this study, the experimental performance of use R1234yf refrigerant al-ternative to R134a in an automobile air conditioning system with var-iable capacity compressor was investigated. The conditioner con-sists a variable compressor, evaporator, condenser, liquid tank and expansion element. is equipped computer-aided control systems obtain desired conditions data col-lection for measuring col...

Vibration and noise are undesirable effects in daily life energy-consuming systems. In this study, the of different refrigerants on vibration a sealed reciprocating compressor discussed. The study compared performances with lower ozone depletion potential (ODP) values to R22, which has high ODP value. was carried out experimentally two stages. Firstly, tests were conducted for coefficient perfo...

A heat pump system is constructed tO evaluate the performance and the heat transfer characteristics. Mixtures of R22/Rl42b are adopted in the heat pump. The heat transfer in the evaporator and the overall perfomance arc measured and analyzed in terms of the compositions and the flow rate of the refrigerants. The evaporator consists of counter~currem concentric circular tubes. Possibility of cap...