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REFRIGERATION AND AIR CONDITIONING RAC 5th /Mech/5321/Feb 2021 Diploma Paper

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REFRIGERATION AND AIR CONDITIONING 5th Sem/Mech./5321/Feb 2021

                                SECTION-A

Q2. Attempt any Three questions.                                                                    5×6=3

i. Explain the effect of sub-cooling with the help of p-h diagram.
ii. When used as refrigerant, state the properties of the following:
iii. Carbon Dioxide- CO2 (R-744)(b) Ammonia-NH3 (R-717)
iv. Explain the working of flood evaporator with the help of a neat sketch.
v. Write comparison between water cooled condenser and air cooled condenser?
vi. Write the advantages of vapour absorption system over vapour compression system
vii. Define: a) Percentage Humidity or Degree of Saturation b) Latent Heat and Its Types

                                     SECTION-C

Q3. Attempt any one question.                                                       1×10=10

a. What do you mean by effective temperature? Explain the factors which affect the effective temperature.
b. Describe briefly i) Cooling dehumidification ii) Infiltration
c. Draw the PV and TS diagram of Bell Coleman Cycle and derive an expression of its COP.
d. Describe briefly the principle and working of a vapour compression system.

Explain the effect of sub-cooling with the help of p-h diagram.

When used as refrigerant, state the properties of the following:

Write comparison between water cooled condenser and air cooled condenser

Advantages of vapour absorption system over vapour compression system

a) Percentage Humidity or Degree of Saturation b) Latent Heat and Its Types

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REFRIGERATION AND AIR CONDITIONING RAC 5th /Mech/5321/Feb 2021 Diploma Paper

Effective temperature

factors which affect the effective temperature.

i) Cooling dehumidification

ii) Infiltration

PV and TS diagram of Bell Coleman Cycle and derive an expression of its COP.

Principle and working of a vapour compression system.

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