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Textbook of Refrigeration and Air Conditioning

O,R P or EP. The actual expansion of air in refrigerayion second cooling turbine is represented by the curve ‘. Similarly, a refrigerating system working on the reversed Carnot cycle, will have the maximum possible coefficient of performance.

The sulphur dioxide does not mix readily with oil. Mathematically, Q Theoretical C. When the power requirements, needed to transport the additional weight of the refrigerating system are taken into account, the air cycle systems usually prove to be the most efficient. The closed air refrigeration cycle has Lhe following thermodynamic advantages: The ammonia, being the cheapest, is widely used in large industrial plants such as cold storages refrigerahion ice plants.

Time taken to achieve cooling.

A thermostat is used to control the temperature in the refrigerator. Conditiohing line represents adiabatic humidification and the line represents sensible cooling. Performance Characteristics of Refrigerant Reciprocating Compressor.

This process is shown by the curve 5′- 6 in Fig, 3. The rotary compressors are used with refrigerants having intermediate pressures and volumes of the suction vapour. The heat is transferred across a boundary from a system at a higher temperature to a system at a lower temperature by virtue of the temperature difference.


L Cycle with dry saturated vapour after compression, textbiok. Mathematically, Work done – F x x www. During sensible cooling of air, the dry bulb temperature o increases ft decreases c remains xonditioning The air is now expanded isothermally i.

Full text of “A Textbook Of Refrigeration And Air Conditioning By R. S. Khurmi And J. K Gupta”

However, single row condensers require more space than multi-row condensers. The pressure drop in the heal exchanger is neglected. When steady conditions are reached, the air flowing at seel ion 2 is saturated with water vapour. In this cycle, the cooling fefrigeration superheated vapour will lake place in two stages.

The properties of R are given below: From the figure, we find that Work done during compression. We have already discussed that C. Compare the various air cooling systems used for aircraft.

Manufacture of Hydrocarbon refrigerants. Power required to take the load of cooling in the cabin First of all, let us Find the mass of air mj required for the refrigeration purpose. In actual practice, because of internal friction due to irreversibilities, the temperature of the rammed air is more than TV Thus the actual ramming process is shown by conditloning curve ‘ which is adiabatic but not iscntropic due to friction.


R of the plant is 1. All these modes occur across the surface area of a system because of cconditioning temperature difference between the system and the surroundings. A system is said to refrigrration in chemical equilibrium, when there is no chemical reaction within the system and also there is no movement of any chemical constituent from one part of the system to the other, 1. The heal is a form of transit energy which can be identified only when it crosses the boundary of a system.

Jt is also known as adiabatic index.

Cy Cy The values of cc and y for some common gases are texbtook below: The following points are worth noting about heat: The authors have tried to avoid such questions in the text of the book. Assumptions in Two Stage Compression with Intercooler.

Theoretical power required First of alk let us find the temperature of superheated vapour at point 2 7V. Another disadvantage of the open cycle system is that the moisture is regularly carried away by the air circulated through the cooled space.