The development of vapor compression refrigeration systems currently depends on the issue environmental problems related to ozone layer depletion (ODP) and global warming potential (GWP). In addition issues, low energy use is also in spotlight researchers. To solve problem development, natural refrigeration, especially hydrocarbons, focus attention. Hydrocarbons are refrigerants that have excel...

A modification of Peng-Robinson equation is described wherein in the parameter b is expressed as a linear function of temperature. The modified equation is then applied to a series of light hydrocarbons and refrigerants, and predicted values for vapor pressure, saturated vapor volume, saturated liquid volume and the heat of evaporation are compared with the corresponding experimental data. ...

The awareness to protect the environment from the harmful effects of CFCs has motivated the refrigeration scientists and engineers to study alternative refrigerants to replace the CFCs even in the existing units. This paper presents a thermodynamic study of hydrocarbon blends (Propane/lsobutane) and blends of HFC-134a-HC-600a as a possible "drop-in" (some electrical component to be changed to m...

Concerning the use of HFCs as substitutes for CFCs and HCFCs a major concern in applications with remarkable leakages of refrigerant is its contribution to global warming. Therefore, the attention has been drawn to the use of natural working fluids, like carbon dioxide, hydrocarbons, water and air. Air had been already used in the range of air conditioning technology. Air as refrigerants is sta...

Air conditioning contributes significantly to building energy consumption in hot climate regions. In addition to greater cooling requirements in hot climates, cooling equipment efficiency decreases with increasing outdoor temperature. Therefore, it is advantageous to develop improved technologies that can achieve higher efficiency at high ambient conditions. In this paper, two novel compression...

Recently, the development of environmentally friendly refrigerants has emerged as a major issue in industry. Owing to high cost developing new refrigerants, falling-film evaporators are attracting increasing interest, given their reduced refrigerant usage compared with flooded evaporators. In falling–film evaporators, distributor at top evaporator uniformly delivers through multiple holes over ...

In this work, CO2 conditioning processes for ship-based CCS sequestration are modelled using the software APSEN HYSYS V11. This study uses captured gas from 3D project as feed. The feed stream contains water, H2S, and CO contaminants. purification dehydration, desulfurization, removal reviewed. Two liquefaction approaches, open-cycle closed-cycle liquefaction, compared transport pressures 7 15 ...

The temperature separation effects of vortex tubes have been widely studied in open systems, using mainly air or N2as the working fluid. When a tube is employed closed thermal system, more fluid choices, such as refrigerants, could be considered. Different to air, refrigerants quite varied thermal-physical properties, and research properties? influence on effect rather limited. Based CFD simula...