Heating, Ventilation, Air Conditioning & Refrigeration (HVACR) SPPU Endsem Question Paper Nov 2022
All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.
- Subject code
- 402041
- Pattern
- 2019 pattern
- Exam
- Endsem
- Session
- Nov 2022
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- VII
- Paper code
- [5927]-412
Printed for: B.E. (Mechanical & Automobile)
Instructions to the candidates
- Solve Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
- Neat diagrams must be drawn wherever necessary.
- Figures to the right indicate full marks.
- Use of scientific calculator is allowed.
- Assume suitable data, if necessary.
Questions
Q1
- a)[5]
Explain with a neat sketch Thermostatic Expansion Valve.
- b)[6]
Discuss the following terms used in thermodynamic analysis of Simple Ejector Refrigeration Cycle. i) Entrainment Ratio ii) Entrainment efficiency iii) Nozzle efficiency
- c)[6]
Explain with a neat sketch Low Pressure (LP) cut off used in VCR cycle.
OR- a)
Q2
Q3
- a)[6]
What is CLTD method? How it connects with time lag and decrement factor?
- b)[12]
A commercial shop has following loads : Room sensible heat : 58.15 kW Room latent heat : 14.54 kW 2 The summer outside and inside design conditions are : Outside : 40ºC DBT, 27ºC WBT Inside 25ºC DBT, 50% RH 70 m 3 /min of ventilation air is used. Determine the following if the by-pass factor of the cooling coil is 0.15. i) Ventilation load ii) Grand total heat iii) Grand sensible heat factor iv) Effective room sensible heat factor v) Apparatus dew point
OR- a)
Q4
- a)[10]
Explain the ASHARE comfort chart showing the comfort zones for winter and summer. Also explain factors (any two) affecting human comforts.
- b)[8]
Atmospheric air at 30ºC dry bulb temperature and 75% relative humidity enters a cooling coil at a rate of 200m 3 /min. The coil dew point temperature is 14ºC and the by-pass factor of the coil is 0.1. Determine : i) The temperature of air leaving the cooling coil; ii) The capacity of the cooling coil in tonnes of refrigeration and in kW iii) The amount of water vapour removed per minute; and iv) The sensible heat factor for the process.
- a)
Q5
- a)[4]
What is infiltration and Ventilation?
- b)[8]
A Duct of Rectangular cross section 600mm × 400mm carries 90m 3 /min of air having density of 1.2kg/m 3 . Determine the equivalent diameter of the circular duct; i) When the quantity of air carries in both the cases is same; ii) When velocity of air in both cases is same. Take friction factor is 0.011. Also calculate pressure loss per 100m length of duct.
- c)[6]
Explain Fan Coil System? Write application of various types of Fans. 3
OR- a)
Q6
- a)[5]
What do you mean by Infiltration? Explain Natural Ventilation induced by wind.
- b)[7]
Using Equal friction method, determine the duct diameter and velocity for section AB, BD and BC. Assume velocity in the main duct AB = 600m/min. Also Calculate maximum pressure drop in the duct system. Distance AB = 30m, Distance BC = 30m and Distance BD = 10m. Refer the figure as given below :
- c)[6]
Explain any two types of “Air Distribution System” used in Air Conditioning system.
Also asked:Nov 2025
- a)
Q7
ORQ8