Heating, Ventilation, Air Conditioning & Refrigeration (HVACR) SPPU Endsem Question Paper May 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
- May 2023
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- VII
- Paper code
- [6004]-604
Printed for: B.E. (Mechanical)
Instructions to the candidates
- Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
- 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
ORQ2
- a)[5]
Explain with a neat sketch Thermostatic Expansion Valve.
- b)[6]
Discuss the following terms used in thermodynamics 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.
- a)
Q3
- a)[8]
- b)[10]
The air-handling unit of an air-conditioning plant supplies a total of 4500 cmm of dry air which comprises by weight 20% fresh air at 40°C DBT, 27°C WBT, and 80 % recirculated air at 25°C DBT and 50% RH. The air leaves the cooling coil at 13°C saturated state. Calculate the following i) Total cooling load, and ii) Room heat gain.
Also asked:Nov 2024
ORQ4
- a)[6]
- b)[12]
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: Sensible and latent heat loads per person 80 W and 50 W respectively; lights and fans, 15000 W; sensible heat gain through glass ceiling etc. 15000 W. The air infiltration is 20 m 3 /min and fresh air supply is 100 m 3 /min. Two-third of recirculated room air and one-third of fresh air are mixed before entering the cooling coil. The bypass factor of the coil is 0.1. Determine i) Apparatus dew point, ii) Grand total heat load and iii) Effective room sensible heat factor.
Q5
- a)[5]
What is infiltration and Ventilation? What are different Methods of Infiltration?
Also asked:Nov 2023
- b)[7]
A circular Duct of 400mm 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
- c)[6]
Write a note on FAN Law, List the different types of fans used in air conditioning system, state applications.
OR- a)
Q6
- a)[4]
- b)[7]
In the air duct system, as shown figure below, air enters at A with a static pressure of 7.5 mm of water. The branch B is 15 m long and delivers 120 m 3 /min. The branch at C is 22.5 m long and delivers 140 m 3 /min. At the end D of the main duct, the air delivered is 200 m 3 /min. Using friction chart and equal pressure drop method determine the diameter and velocity pressure in lengths AB, BC, CD, BE, CF Duct sections. Consider friction losses only.
- c)[7]
Define the following as applied to “Air Distribution System” Intake, Outlet, Grille, Register, Diffuser, Throw and Primary Air.
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)