A TEXTBOOK OF REFRIGERATION AND AIR CONDITIONING BY KHURMI PDF

  • June 14, 2019

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The make up w ater is added to the chamber at this temperature to make the w r ater level constant. Three stage compression with flash chambers. 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. This leads to the formation of frost at the end of expansion process and clog the line.

L Incomplete or imperfect interceding. The process ‘ represents the actual compression process because of internal friction due to irreversibilities. The potential energy, kinetic energy and internal energy are the examples of stored energy. In this system, the mass of the working substance crosses the boundary of the system. Now from point 1, draw a constant entropy line intersecting the horizontal condenser pressure line at point 2, as shown in Fig.

It takes the addition of heat or the removal of heat to produce these changes. The various equations for poly tropic process may be expressed by changing the index n for yin the adiabatic process, ie.

The absolute zero temperature, for all sorts of calculations. Since the actual C. The performance of a heat engine is expressed by its efficiency. The vertical line 2′-l’ represents the isentropic cooling process and the curve 2′-2″ represents the actual cooling process. According to this law, when a dosed system undergoes a thermodynamic gycle, the net heat transfer is equal to the net work transfer.

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

Thus the use of Hash chamber has no effect on the thermodynamic cycle. It may be noted that only the stored energy is a thermodynamic property whereas the transit energy is not a thermodynamic property as it depends upon the path.

In this cycle, the cooling of superheated vapour will lake place in two stages. L units in refriegration and commerce. In tin aeroplane, a simple air refrigeration is used.

Trivia About Textbook of Refri The discharge from the evaporator is sent again to the accumulator which helps to keep off the liquid from entering the compressor. Regenerative Air Cooling System. P, of the Camot refrigerator will be high. This line is called RSHF line. Anupam Singh rated it it was amazing Mar 21, This negative gauge pressure is known as vttcuum pressure.

If the compressor is supplied with liquid along with vapour refrigerant. T 3 is more than the suction temperature of refrigerant i. It is a system of fixed mass and no heat or work energy cross its boundary.

Find the tonnage of ihe plant which runs for 18 hours per conditionnig.

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

For example, when there is a flow of energy between a system and its surroundings, ihc energy [ran. S, units has been revised to recognise all the S. Now the refrigerants leaving the back pressure valves at points 6 and 9 are mixed together with the refrigerant leaving the First evaporator at point II, at pressure p K which is the suction ov of the compressor.

The other data available is as follows: The sulphur dioxide does not mix readily with oil. The heal flowing into a system is considered as pwitn and the heat flowing out of a system is considered as m yjitive.

refrigerafion

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

Draw the temperature-entropy and enthalpy-entropy diagram of a steam jet refrigeration system and write the expressions for the following efficiencies: In a vapour absorption system, heat is supplied to the generator at a temperature of 90 c ‘C.

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The values of wet bulb temperatures are generally given along the saturation curve of the chart as shown in the condiioning. The cold air from the refrigerator is drawn into the compressor cylinder where il is compressed condiitioning in the compressor as shown by the curve on p-v and T-s diagrams.

If the actual C. But, whenever the value textboook temperature is used in equations relating to fundamental laws, then the value of temperature, whose reference point is true zero or absolute zero, is used. After that no compression takes place with the inw ard movement of the piston, Now during the remaining part of the compression stroke, the compressed refrigerant is discharged to condenser till the piston reaches its top dead centre. Sumit Dhiman rated it did not like it Jan 05, Determine the specific humidity and the dew point and wet hulh temperatures of air If this air is cooled in an air washer using rec irculated spray water and having a humidifying efficiency of 0.

The ambient air pressure and temperature are 0. During sensible cooling of air, the specific humidity a increases ft decreases c remains constant Power required conditiioning maintaining the cabin at the required condition ; and 3. The ambient khur,i and temperature are 0. The pressure drop in the heal exchanger is neglected. It also show’s the latent heat, mass of refrigerant circulated per tonne of refrigeration and khkrmi volume of the liquid refrigerant per tonne of refrigeration.

Regenerative air cooling system. Similarly, It is also not possible to make a refrigerating machine working on the reversed Carnot cycle.

Steady flow process, and 2, Unsteady flow process.