Refrigeration and air conditioning notes pdf

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Refrigeration and Air Conditioning - RAC Study Materials | PDF FREE DOWNLOAD

Refrigeration Cycle: Refrigeration is the process in which heat is removed from a body enclosed space so that its temperature is reduced and then maintained at the temperature below the surrounding temperature. The working substance which is used to produce refrigeration is known as refrigerant. Heat Pump: Heat pump is used to remove heat from a body at lower temperature and transfer this heat to a body having high temperature on the expense of external work supplied. Coefficient of Performance;. Here, the desired effect is to give heat to higher temperature body.
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Mechanical Engineering mcq on # Heat Transfer, Refrigeration and Air Conditioning - PART-1


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In other words it is the process of cooling a substance. This can be achieved only if the heat is removed from that substance. Principle of refrigeration: The principle of refrigeration is based on second law of thermodynamics. It sates that heat does not flow from a low temperature body to a high temperature body without the help of an external work. In refrigeration process, since the heat has to Hot Body be transferred from a low temperature body to a high temperature body some external work has to be done according to the second law of thermodynamics as work shown.

In other words, refrigeration means artificial human-made cooling [1] [2]. Heat is removed from a low-temperature reservoir and transferred to a high-temperature reservoir. The work of heat transfer is traditionally driven by mechanical means, but can also be driven by heat, magnetism , electricity , laser , or other means. Refrigeration has many applications, including, but not limited to: household refrigerators , industrial freezers , cryogenics , and air conditioning. Heat pumps may use the heat output of the refrigeration process, and also may be designed to be reversible, but are otherwise similar to air conditioning units. Refrigeration has had a large impact on industry, lifestyle, agriculture, and settlement patterns. The idea of preserving food dates back to at least the ancient Roman and Chinese empires.

Lesson 3. Lesson 5. Effect of change of operation conditions on the working of vapour compression refrigeration plant. Lesson Importance of Multiple evaporator and compressor systems, Multi evaporator and one compressor systems. Click Here. Disclaimer: The information on this website does not warrant or assume any legal liability or responsibility for the accuracy, completeness or usefulness of the courseware contents.


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