A text book of refrigerarion and air-conditioning by R S Khurmi. Refrigeration and airconditionin by rs khurmi. Onkar Nath. Engineering. Textbook of Refrigeration and Air-conditioning has ratings and 8 reviews. For the students of B.E.;UPSC(Engg. Services); UPSC (Civil Services); Secti. I found a Substitute for A Textbook of Refrigeration and Air Conditioning by R. S. Khurmi. This Substitute has all the Similar Topics Covered. Please get it from.
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The various processes are discussed below: In – Actual increase in temp. It is compressed in the compressor to 5 bar and cooled to K at the same pressure. Assuming ramming action to be isetttropic, the required cabin pressure of 0. Preview — Textbook of Refrigeration and Air-conditioning by R. The process 2′-3 represents isentropic compression of air in the main compressor and the process l! Mass of refrigerant at point 4 required to be circulated through the third evaporator or the highest temperature evaporator, ft x10 The following relations arc important for the reversible adiabatic or isentropie process, a!
Textbook of Refrigeration and Air Conditioning : R. S. Khurmi :
Hence the volumetric efficiency decreases as the clearance factor increases. The sensible heat factor scale is shown on the right hand side of the psy chrome trie chart.
The temperature of air recorded by a thermometer, when it is not effected by the moisture present in it, is called a wet bulb temperature 6 dry bulb temperature c dew point temperature d none of these 3.
The air bled from the main compressor is first cooled by the ram air in the first heat exchanger This cooled air, after compression in the secondary compressor, is led to the second heat exchanger where it is again cooled by the ram air before passing to the cooling reffigeration. However, single row condensers require more space than multi-row condensers.
The ambient pressure and temperature are 0.
May 07, Rohit Raizada rated it really liked it. L Isentropic compression process.
Textbook of Refrigeration and Air-conditioning (M.E.)
In the cooler, the compressed air is cooled to 15 C, pressure remaining zir same, ft is then expanded w a pressure of l bar in art expat]sion cylinder ; from where it is passed to the cold chamber Find ; I. But this does not reverse the cycle, on which it works, A two-stroke petrol engine may be made to revolve in reverse direction by altering the timing of ignition. Find the tonnage of ihe plant which runs for 18 hours per textbolk.
Boot strap air evaporative cooling system. Now, if this gas is heated, it will increase the temperature and pressure of the gas in the container. The relevant properties of refrigeratiob chloride are as follows: The ambient air conditions Eire 15 6 C and 0.
The above mentioned types are now discussed, in detail, one by one in the following pages. Constant pressure process or I so baric process We akr already discussed that when a gas is heated at a constant pressure, its temperature and volume will increase.
A little consideration will show that when the operations are performed in the reversed order, the cycle draws heat from the cold body and rejects it to the hot body. Simple Saturation Cycle with Accumulator or Precoaler. In engineering, we are mainly concerned with steady flow processes. The temperature at which the volume of a gas becomes zero is called absolute zero temperature. During the compression stroke, both the pressure and temperature increases and the specific volume of air at delivery from compressor reduces from v, to annd 2.
The line S’- 6 represents the refrigeration process. I X Advantages of Multistage Compression, The enthalpy at point 2 as read from p-h diagram is h z – The compression and expansion are isenlropic f. The air, in this system, is used for absorbing heat from Ihe other fluid say brine and this cooled brine is circulated into the space to be cooled. In engineering practice, the intensive property difference is the pressure difference.
These three modes of heat transfer are quite different, but they have one factor in common. But it did not elaborate the rules for the usage of the units. Types of Vapour Compression Cycles. Want to Read saving…. L Mass of the air bled from cooling turbine to he used for regenerative coding ; 2.
The behaviour of a perfect gas, undergoing any change in the above mentioned variables, is governed by the following laws, which have been established from expert mental results.
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. Let the pressure and temperature of ambient air is p refriegration and T, respectively.
The water has the ability to absorb very large quantities of ammonia vapour and the solution thus formed, ts known as iff fiat-ammonia The absorption of ammonia khurji in water Iowcts the pressure in the absorber which in turn draws more ammonia vapour from the evaporator and thus raises the temperature of solution.
A dash is to be used to separate units that are multiplied together. In a reversible process, there should not be any loss of heat due to friction, radiation or conduction, etc. The specific volume also reduces from v 2 to v 3. As the air passes through the chamber over a long sheet of water, the water evaporates khurmo is carried with the flowing stream of air, and the specific humidity of the khuemi increases. The main causes for the irreversibility are: In some cases, aeroplanes cany an auxiliary gas turbine for cabin pres suri sat ocnditioning and air conditioning.
The wet bulb temperature lines are inclined straight lines and non-uniformly spaced as shown in Fig. This book is not yet featured on Listopia. For air assume law for expansion.