RAC (Diploma Mechanical Engineering 5th)

                                                          REFRIGERATION

1. Fundamentals of Refrigeration (06 hrs)

Introduction to refrigeration, and air conditioning, meaning of refrigerating effect, units

of refrigeration, COP, methods of refrigeration. Introduction to air refrigerator working

on reversed carnot

2. Vapour Compression System (12 hrs)cle.

Introduction, principle, function, parts and necessity of vapour compression system, T- 

and p– H charts, dry, wet and superheated compression. Effect of sub cooling, super

heating, mass flow rate, entropy, enthalpy, work done, Refrigerating effect and COP.

actual vapour compression system

3. Refrigerants (06 hrs)

Functions, classification of refrigerants, properties of R - 717, R – 22, R–134 (a) and

CO2. Properties of ideal refrigerant, selection of refrigerant

4. Vapour Absorption System (06 hrs)

Introduction, principle and working of simple absorption system and domestic electrolux

refrigeration systems. Solar power refrigeration system, advantages and disadvantages of

solar power refrigeration system over vapour compression system.

5. Refrigeration Equipment (14 hrs)

5.1 Compressor - Function, various types of compressors

5.2 Condenser - Function, various types of condensers

5.3 Evaporator - Function, types of evaporators

5.4 Expansion Valve - Function, various types such as capillary tube, thermostatic

expansion valve, low side and high side float valves, application of various

expansion valves

5.5. Safety Devices-Thermostat, overload protector LP, HP cut out switch.

101

                                                                           AIR CONDITIONING

6. Psychrometry (08 hrs)

Definition, importance, specific humidity, relative humidity, degree of saturation, DBT,

WBT, DPT, sensible heat, latent heat, Total enthalpy of air. Psychrometry chart and

various processes of psychrometry

7. Air-Conditioner (12 hrs)

Study of window air-conditioning, split type air conditioning, concept of central air- condition, automobile air-conditioning