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Ambient pressure Pressure of ram air Temperature of ram air Pressure at the end of main compressor Efficiency of main compressor Heat exchanger effectiveness Teextbook at the exit of the auxiliary turbine Efficiency of auxiliary turbine Temperature of air leaving the cabin Pressure in the cabin Row rale of air through cabin Or Determine the final dry hath temperature and relative humidity of air washed with recirculated spray water if the air is initial!

As a matter of fact, the efficiency of an intercooler plays an important role in the erfrigeration of a two stage reciprocating compressor. The pressure ratio of compressor is 4. Find the refrigeration capacity of the plant Solution, Given: It refigeration further expanded in the expander to L bar and discharged to take the cooling load.

Due to this reason, a dosed cycle or dense air Bell-Coleman refrigerator as shown in Fig. 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 process ‘ represents the actual compression process because of internal friction due to irreversibilities.

The pressure reducing valve reduces the pressure of condensate from the condenser pressure to the evaporator pressure. It is a system of fixed mass and no heat or work energy cross its boundary. List the names of three evaporative coolants that can he used in aircraft refrigeration system at an altitude of 15 metres.


Similarly, It is also not possible to make a refrigerating machine working on the reversed Carnot cycle. Effect of Suction Pressure. Therefore, an oil lighter than that used with other refrigerants may be used in the compressors. In a steady flow process, the following conditions must be satisfied: FmJ far power required bh run the system; and b the coefficient of performance of the combined system. Open Preview See a Problem? Actual increase in temp.

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

If the gas is cooled at a constant pressure. R of the Carnot refrigerator will be high.

The air is now expanded isothermally i. The area below the p-v diagram of any thermodynamic process represents the work done during that process. Textbook of Refrigeration and Air-conditioning M. The authors have tried to avoid such questions in the text of the book. Chandru Sengodan rated it liked it Aug 31, Shivprasad Shaiv rated it it was amazing May 03, It is not a point function as the temperature and pressure.

The stagnation pressure after isentropic compression p 2 is given by Tf Ea. L Stored energy, and 2, Transit energy or energy in transition The is the energy possessed by a system whthin its boundaries.

The corresponding p-h diagram is shown in Fig. From the figure, we find that work done during suction conditioing. It is a very stable refrigerant with a high critical temperature and it is non-flammable and non-explosive.

Textbook of Refrigeration and Air Conditioning

Want to Read Currently Reading Read. We know that room sensible heat load, RSH – 0. The dry bulb temperature lines are vertical be. When the power requirements, needed to transport the additional off of the refrigerating system are taken into account, the air cycle systems usually prove to be the most efficient. Coditioning NH 3 2. Now we shall find out the amount of work done in compressing the refrigerant in all the above mentioned three cases.


The air for cooling is taken from the cooling turbine which lowers the high temperature of rammed air. It is usually denoted by h r Thus, the sensible heat may be defined as the heat which causes a change in temperature in a substance. Steam engine cranks may be made to revolve in a reversed direction by mechanically altering the valve settings.

The refrigeration has also wide applications in submarine ships, aircraft and rockets.

Each of these scales is based on two fixed points known as tire: The pan of the air passes through the coil and part is by-passed around the coil. It is generally denoted by r; In S I. Finally, the air is passed through the cooling turbine and then it is supplied lo the cabin at a pressure of 1.

Derive an expression for finding out the mass of motive steam required per kg of water vapour produced. Assuming ramming action to be isetttropic, the required cabin pressure of 0. Values of specific heats for some commonly used substances. The scientists, of the time, developed a few stray machines to refrigeraion some pleasure.

The concept of this system is particularly useful in formulating the principles derived from the Second Law of Thermodynamics. Manoj rated it it was amazing Dec 06,