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• W1435338112 abstract "The present paper reviews recent developments on the influence of oil on several thermophysical phenomena in reciprocating compressors. Besides the more essential role of lubrication, the oil is responsible for several tasks in the compressor, from cooling to keeping a low system pressure while the compressor is idle. Thermodynamics dictates the amount of dissolved refrigerant the oil can retain at a particular condition. Hence, the viscosity of the lubricant is directly affected by the refrigerant solubility in the oil. Heat transfer is crucial for keeping a low temperature in the compressor because thermodynamic losses increase with increasing gas temperature. Fluid mechanics is essential to guarantee that oil is delivered to the bearings and that lubrication is performed efficiently under any operating condition. INTRODUCTION As with other economic sectors, the refrigeration industry is being faced by many challenges through recent and present times concerning ecological sustainability and environmental impact. CFCs have already been banned in many countries and HCFCs (their temporary replacements in the refrigeration industry) will be so by 2030 in many parts of the developed world [1]. It is widely acknowledged, however, that the issue of Global Warming should not be looked at only from a perspective of direct emissions, i.e., refrigerant leakages during operation and equipment end-of-life. As pointed out by many sources [1-3], approximately 80% or more of the Global Warming impact of refrigeration plants is due to energy consumption (an indirect effect), and not to refrigerant leakage. There are more than 10 domestic refrigerators currently in operation worldwide, which corresponds to a doubling of the production between 1990 and 2002 [1]. In worldwide commercial refrigeration, there are more than 75 × 10 units in operation [4]. Overall, refrigeration consumes about 15% of all electricity produced worldwide, and the latter is mostly associated with fossil fuels. Reducing the energy consumption of refrigeration systems has now become a key environmental priority [1]. A typical household refrigeration appliance operates according to the thermodynamic cycle shown in Figure 1. The compressor is responsible for moving the refrigerant through the components of the cycle and for, together with the expansion device, establishing regions of low and high refrigerant saturation pressure in the cycle. The removal of the cooling load from the ambient and its rejection (together with the compressor work, in the form of heat) to the environment is accomplished via the evaporator and condenser, respectively. An internal heat exchanger is often utilized as a means of increasing the refrigeration capacity by admitting a low vapor quality refrigerant in the evaporator [5]. This heat exchanger also guarantees that no liquid is present in the compressor suction by superheating the vapor as it leaves the evaporator. Figure 2 shows a p-h diagram of the vapor compression cycle." @default.
• W1435338112 created "2016-06-24" @default.
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• W1435338112 date "2007-01-01" @default.
• W1435338112 modified "2023-09-26" @default.
• W1435338112 title "The thermodynamics, heat transer and fluid mechanics role of lubricant oil in hermetic reciprocating compressors" @default.
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