Reg No.:

Max. Marks: 100

12

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00000AU309 1219081116:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth semester B.Tech degree examinations (S) September 2020

Course Code: AU 309
Course Name: Heating Ventilating and Air Conditioning

(Refrigeration table and psychrometric chart are permitted)

PARTA
Answer any 3 questions, each carries 10 marks.

List the common problems of warm air heating system.
List the needs of ventilation.
With a sketch explain two pipe water heating systems.
Identify the basic difference between gravity heating system and forced heating
system.
With a sketch explain the working of heat pump.
Differentiate between “back to back ventilation” and “cross ventilation”.
What do you mean by air change in air conditioning?
Describe the effect of humidity and microbial growth.
PART ‏تا‎

Answer any three questions, each carries 10 marks.
5000 Kg of water at 20°C is converted into ice at -30°C in 12 hours. Determine the
heat removal rate in kW and in Ton of Refrigeration (TR). Latent heat of fusion of
ice is 335 kJ /kg.
List the advantages of mixed refrigerants
Atmospheric air at 760 mm of mercury barometric pressure has 25°C dry bulb
temperature and 15°C wet bulb temperature. Determine using Psychrometric chart
1. Relative humidity 2. Specific humidity
3. Dew point temperature 4 Enthalpy
5. Specific Volume
Illustrate the Psychrometric process “Sensible heating”.
Explain required thermodynamic properties of refrigerants.

Describe the significant of GWP of refrigerants.

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Duration: 3 Hours

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