: 00000AU309121901 Pages: 3

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: AU309
Course Name: HEATING, VENTILATING & AIR CONDITIONING
Max. Marks: 100 Duration: 3 Hours
(Use of refrigeration table, psychrometric chart and steam table may be permitted.)
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 a) Explain the construction and working of forced warm air heating system with a (6)
neat sketch.
b) Prepare a short note on radiant heating systems and their applications. (4)
2 ച Discuss the merits of hydronic systems for space heating. (4)

b) Describe the salient features of two pipe direct return and two pipe reverse (6)
return systems with neat sketches.
3 9) Explain the effects of relative humidity on ventilation. (4)
b) Prepare short notes on the following room air distribution systems with neat (6)
sketches.
i. Mixing systems

ii. Under floor systems

4 a) Classify the contaminants which affect the indoor air quality. (3)
b) What are the mechanisms of particle collection in filters? (3)
c) Discuss parallel blade damper and opposed blade damper with neat sketches. (4)
PART ‏تا‎
‎Answer any three full questions, each carries 10 marks.
5 9) Write the designation of following refrigerants. (2)
i) CF3;CHCl,
ii) (02
b) Write the chemical formula of following refrigerants (2)
i) R-22
ii) R-50
c) Discuss four salient thermodynamic requirements of refrigerants. (6)

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