Heating, Ventilation, Air Conditioning & Refrigeration (HVACR) SPPU Endsem Question Paper Nov 2023
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 2023
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- VII
- Paper code
- [6181]-231
Printed for: B.E. (Mechanical)
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 side indicate full marks.
- Use of scientific calculator is allowed.
- Assume Suitable data, if necessary.
Questions
Q1
- a)[6]
Explain with a neat sketch Thermostatic Expansion Valve.
- b)[6]
Explain with a neat sketch Low Pressure (LP) cut off used in VCR cycle.
- c)[5]
Distinguish between the air cooled and water cooled condensers.
Also asked:Nov 2022
OR- a)
Q2
Q3
- a)[8]
- b)[10]
Atmospheric air at 30°C dry bulb temperature and 75% relative humidity, enters a cooling coil at a rate of 200 m 3 /min. The coil dew point temperature is 14°C 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 TR and in kW; iii) The amount of water vapour removed per minute; and iv) The sensible heat factor for the process.
ORQ4
- a)[9]
- b)[9]
A conference room for sitting 100 persons is to be maintained at 22°C DBT and 60% relative humidity. The outdoor conditions are 40°C DBT and 27°C WBT. The various loads in the auditorium are as follows : i) Sensible and latent heat loads per person 80 W and 50 W respectively; ii) Lights and fans, 15000 W; iii) Sensible heat gain through glass ceiling etc. 15000W. iv) The air infiltration is 20 m 3 /min and fresh air supply is 100 m 3 / min. v) Two-third of recirculated room air and one-third of fresh air are mixed before entering the cooling coil. vi) The bypass factor of the coil is 0.1. Determine :
- a)
Apparatus dew point,
- b)
Grand total heat load and
- c)
Effective room sensible heat factor
Q5
- a)[8]
What is infiltration and Ventilation? What are different Methods of Infiltration?
Also asked:May 2023
- b)[10]
A circular duct of 400 mm is selected to carry air at a velocity 440 m/min. If duct is replaced by rectangular duct of aspect ratio 1.5. Find the size of rectangular duct for equal friction when; i) Velocity in two Duct is same. ii) Discharge in two Duct is same. If f = 0.015, Find the pressure loss per 100m length of Duct. Take density of air = 1.15 kg/m 3 .
OR- a)
Q6
- a)[8]
- b)[10]
Using Equal friction method, determine the duct diameter and velocity for section AB, BD and BC. Assume velocity in the main duct AB = 600 m/min. Also Calculate maximum pressure drop in the duct system. Distance AB = 30 m, Distance BC = 30 m and Distance BD = 10 m. Refer the figure as given below.
Q7
- a)[6]
- b)[6]
- c)[5]
ORQ8
- a)[6]
Explain with neat sketch All water system.
- b)[6]
Write a short note on Sorbents and Desiccants.
- c)[5]
This part has equations that don’t show as text. Open the PDF to read it.
- a)