Oil return from the evaporator to the compressor crank case is a critical requirement affected by the refiigerantllubricant properties, gas velocities and piping geometry. Refrigerant R-22 has been successfully used with mineral oil in residential air-conditioning and heat pump systems (AC/HP). R-407C and R-41 OA are two chlorine free HFC refrigerant candidates to replace R-22. This paper descr...

Ammonia can be applied to any type and size of refrigeration system from domestic refrigeration to commercial refrigeration and air-conditioning to industrial refrigeration. However, it is desirable to minimize the charge to prevent toxic effects and, sometimes to use secondary refrigerants, such as volatile carbon dioxide, to keep ammonia away from the general public. This article describes a ...

the quantitative structure-property relationship (qspr) method is used to develop the correlation between structures of refrigerants (198 compounds) and their critical temperature. molecular descriptors calculated from structure alone were used to represent molecular structures. a subset of the calculated descriptors selected using a genetic algorithm (ga) was used in the qspr model development...

The ability of a material to supply heat by means of conduction is called thermal conductivity, which is defined by Fourier's equation. Thermodynamic data on environmental refrigerants have attracted considerable interest in the design and optimization of refrigeration equipment, such as heat compressors and exchangers. After analysis of statistical effects, a new simple correlation was develop...

The popularity of vehicles and the increased time spent in cars with air conditioning systems has led to regulations many countries that require use environmentally friendly refrigerants minimal global warming zero ozone depletion potential (GWP ODP). Cars need high-performance, eco-friendly reduce their impact on environment, lower fuel consumption, decrease carbon emissions. aim current work ...

The aim of reviewing information was characterizing in the labor factor using refrigeration technology is and their impact on environment. development industry occurred thanks to progress towards coolants. most important aspect refrigerators health human life, atmosphere. By caring for health, European Union achieves legal rights. Research thermodynamic factors pose a wide field work many scien...