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But sometimes a bigger unit of pressure known as bar is used, such that. The process T- 8 represents the heating of air upto the cabin temperature F r www.

refrgeration For the sake of convenience, the unit of force adopted is such that it produces a unit acceleration to a body of unit mass, F – m a – Mass x Acceleration In S. This high pressure and high temperature air is cooled initially in the heat exchanger. Multiple Evaporator and Compressor Systems m Similarly, the refrigerant coming out from the second compressor C 2 U. Effect of Suction Pressure. The performance curves for the various air cooling systems used for aircraft are shown in Fig.

In a refriigeration flow process, the following conditions must be satisfied: Textboook actual practice, the compression will start from pressure p i at point V conritioning expansion from pressure p d at point 3′.

The refrigerants, usually, used for this purpose are ammonia NH 3carbon dioxide C0 2 and sulphur dioxide SO. In this case, the point 3 ties on the isothermal curve as shown in Fig. Similarly, when heat is removed from a substance and akr temperature falls, the heat removed or aie Is called sensible heat.


The refrigerant in the evaporator with oil floating on the top has a tendency to have a higher boiling point than that corresponding to its pressure. Condition of air after the coil and before the recirculated air mures with it The condition of air after the coil and before the recirculated air mixes with it, is shown by point 2 on the psychrometric chart, as shown in Fig.

The leakage occurs due to opening in the joints or flaws in material used for construction. The sling psychro meter is rotated in the air for approximately one minute after which the readings from both the thermometers are taken.

An air refrigeration used for food storage provides 25 TR. VS The standard value of atmospheric pressure is taken as 1.

Also find the volume flow rate through compressor inlet and expander outlet for 1 X TR. The isentropic efficiencies of turbine and compressor are 0.

Textbook of Refrigeration and Air Conditioning

Let at any small section aif shadedthe pressure p of the system is constant If A is the crass-sectional area of the piston, then force on the piston F – pA causes the piston to move through a distance dx. Moreover, it is also impossible to make an absolutely non-conducting cylinder in case of an adiabatic operation.


But it did not elaborate the rules for the usage of the units. The condensate from the condenser is supplied to the evaporator to compensate the water vapour formed in the evaporator.

Textbook of Refrigeration and Air Conditioning : R. S. Khurmi :

A system is said to be in thermal equilibrium, when there is no temperature difference between Lhe parts of the system or between the system and the surroundings. Non-flow processes, and 2. Performance Characteristics of Refrigerant Reciprocating Compressor.

Hydrogen H 2 Conditikning this cycle, the cooling of superheated vapour will lake place in two stages.

The heat is transferred across a boundary from a system refrigerayion a higher temperature to a system at a lower temperature by virtue of the temperature difference.

When the temperature of refrigerant leaving the intercooler i. The latter is generally used in big refrigerating plants. Comparison of Performance of Reciprocating and Centrifugal Compressors. Pressure – enthalpy p-h chart, 4.

Textbook of Refrigeration and Air-conditioning by R.S. Khurmi

If the compressor is supplied with liquid along with vapour refrigerant. Reversible and irreversible process. According to this law, when a dosed system undergoes a thermodynamic gycle, the net heat transfer is equal to the refrigeraion work transfer.