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

Types of Stored Energy. Since the work can not be interpreted similar to temperature and pressure of the system, therefore it is a path function and condihioning depends upon the process. The T-s diagram for a boot-strap air cycle cooling system is shown in Fig. P is always greater than unity. It is also true for pressure and density of the system. Prince Ashish rated it really liked it Jul 24, Regenerative refirgeration cooling system.

P of a refrigerating machine We know r that C.

What is the capacity of the plant in tonnes of refrigeration for cooling the fish? The values of wet bulb temperatures are generally given along the saturation curve of the chart as shown in the figure.

In – Actual increase in temp. The reciprocating refrigeratoon are used with refrigerants having ot pressures and low volumes of the suction vapour. The water starts vaporising at 10G Q C he. L the ratio of by-passed air to ram air used for cooling purposes ; and 2.

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Time taken to achieve cooling. An air refrigerator used for food storage, provides 50 TR. The cold air is passed through the pipes and it is used for absorbing heat from the brine and this cooled brine textvook circulated in the refrigerated space.

The leakage occurs due to opening in the joints or flaws in material used for construction. Preview — Textbook of Refrigeration and Bh by R. Thus the line A B represents suction stroke and the area below this line i.

This refrigerant is not injurious to food and is used commercially as a ripener and preservative of Foods. The air leaves the cabin at a temperature of 25T, Assuming the isentropic efficiencies of the compressor and turbine as 80 per cent textook 75 percent respectively, find ; 1.

The atmospheric temperature is f7 C. When cnoditioning temperature of refrigerant leaving the intercooler i. Explain, with the help of a neat sketch, the working of a steam jet refrigeration system.

If the load on the refrigerating machine is 10 TR, find the amount of air dtrulaied per minute through the system assuming that the actual C.

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

In this system, the mass of the working substance crosses the boundary of the system. Wet bulb thermometer Handle Dry bulb thermometer Bulb covered with wetted wick Fig. The confusion in the units of mass and weight is eliminated, to a great extent, in S.


The leakage tendency of a refrigerant should be low. The isent topic efficiencies of both compressor and turbine are 0,9, Calculate the mass of air circulated per minute and the Refrigeratino. Now for the hextbook cooling process T-W 1M 1. Determine compressor and turbine work per TR ; C. In actual practice, however, an isothermal operation may be approached if the process is so slow that the heat is absorbed or rejected at such a rale that the temperature remains, practically, constant.

The value of gas constant R is different for different gases, Jn S. Both the air and water are cooled as the evaporation takes place.

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

The amount of air supplied rnj may also be obtained as discussed below: The area below the p-v diagram of any thermodynamic process represents the work done during that process. Power required to take the load of cooling in the cabin Refrigeratikn of all, let us Find the mass of air mj required for the refrigeration purpose.

The thermodynamic properties of a system may be divided into the following two general classes: