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Textbook of Refrigeration and Air-conditioning (M.E.)

This applies to all refrigerating machines, both theoretical and practical. It is a system of fixed mass and no heat or work energy cross its boundary. Three stage compression with flash intercoolers. The latter is generally used in big refrigerating plants. The pan of the air passes through the coil and part is by-passed around zir coil.

Textbook of Refrigeration and Air Conditioning

What would be the ideal C. Pressure – enthalpy p-h chart, 4. The ambient air conditions Eire 15 6 C and 0.

But mass remains the same everywhere. The point 2 represents the supply condition of air. The sensible cooling can be done only upto the dew point temperature U Jp as shown in Fig. Cy Cy The values of cc redrigeration y for some common gases are given below: The cooled air from the heat exchanger is expanded upto 1 bar in the second cooling turbine and discharged into air cabin to be cooled.


Pitchaporn rated it it was amazing Feb 07, In that case, etS will be decrease in entropy, The engineers and scientists use it for providing quick solution to problems dealing with adiabatic expansion.

Capacity of the cooling system required 3, C.

The various processes arc as follows: Two stage compression with liquid intercooler. Thus, if there is some friction involved in the process, it becomes irreversible. Though there are many cycles, yet the following are important from the subject conditikning of view: Pankaj Kumbhar rated it really liked it Oct 21, Air Refrigeration Systems m 95 and C.

There is also an arrangement for extra water known as make-up water to flow into the chamber from its top, as shown in Fig. May 07, Rohit Raizada rated it really liked it.

R of the system. Mathematically, heat absorbed by the working substance. They possess satisfactory thermodynamic properties but are highly flammable and explosive. The minimum temperature to which moist air can be cooled under ideal conditions in a spray washer is a dew point temperature of inlet air ft wet bulb temperature of inlet air c water inlet temperature d water outlet temperature www.

The quantity E is an extensive property and represents the total energy of the system at a particular slate.


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

Since the work can not be interpreted similar to temperature and pressure of the system, therefore textbok is a path function and it depends upon the process. The refrigerants, usually, used for this purpose are ammonia NH 3carbon dioxide C0 2 and sulphur dioxide SO.

The cooling demands per unit volume of space, are heavy. Regenerative air cooling system.

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

Let us assume the compression and expansion to be isentropic and y for air as 1. P, of the Camot refrigerator will be high. The condenser temperature is 40 n Refrgeration The liquid refrigerant leaving the condenser is sub-cooled to 30 C C. Similarly, when heat is removed from a substance and the temperature falls, the heat removed or subtracted Is called sensible heat. This phenomenon is known as hvquixs factor www. They are observed at the boundary of the system, 3.

Following are the conditions for reversibility of a cycle: The change in internal energy is equal to the work done. The fallowing two types of specific heats of a gas are important from the subject point of view: