Heating, Ventilation, Air Conditioning & Refrigeration (HVACR) SPPU Endsem Question Paper May 2024
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 2024
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- VII
- Paper code
- [6263]-210
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 and 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
- a)[6]
Explain with a neat sketch Thermostatic Expansion Valve.
- b)[5]
Explain with neat schematic Simple Ejector Refrigeration System.
- c)[6]
Discuss the following terms used in thermodynamics analysis of Simple Ejector Refrigeration Cycle. i) Entrainment Ratio ii) Entrainment efficiency iii) Nozzle Efficiency
OR- a)
Q2
Q3
- a)[8]
Explain in detail the “decrement factor” and “time lag”.
Also asked:Nov 2024
- b)[10]
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
OR- a)
Q4
- a)[8]
What is CLTD method? How it connects with time lag and decrement factor?
- b)[10]
Atmospheric air at 30 °C dew point 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 3
- a)
Q5
- a)[8]
Define the following as applied to “Air Distribution System” Intake, Outlet, Grille, Register, Diffuser, Filter, Throw and Primary Air.
- b)[10]
Using equal Friction pressure drop method and friction chart estimate the diameter and velocity pressure in AB, BC, CD, BE, CF Duct sections. Take the assumption if any.
Also asked:Nov 2024
OR- a)
Q6
- a)[8]
Explain FAN Laws. With neat sketch explain the working of AHU.
- 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 .
- a)
Q7
ORQ8
- a)[6]
What is Heat pump? Write down different circuits of heat pump and Industrial applications of heat pump.
- b)[6]
Explain with neat diagram Direct evaporative cooling air conditioning system.
- c)[5]
This part has equations that don’t show as text. Open the PDF to read it.
- a)