Heating, Ventilation, Air Conditioning & Refrigeration (HVACR) SPPU Endsem Question Paper Nov 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
- Nov 2024
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- VII
- Paper code
- [6354]-612
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 indicate full marks
- Use of Scientific Calculator is allowed
- Assume Suitable data if necessary
Questions
Q1
ORQ2
- 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 2
- a)
Q3
- a)[8]
- 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 40ºC 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. 15000 W. 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 1) Apparatus dew point, 2) Grand total heat load and 3) Effective room sensible heat factor
ORQ4
- a)[8]
Explain in detail the “decrement factor” and “time lag”.
Also asked:May 2024
- 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 o C DBT, 27 o C WBT, and 80 % recirculated air at 25 o C DBT and 50% RH. The air leaves the cooling coil at l3 o C saturated state. Calculate the following. i) Total cooling load, and ii) Room heat gain
Also asked:May 2023
- a)
Q5
- 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. 3
ORQ6
- 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:May 2024
- a)
Q7
- a)[6]
- b)[6]
- c)[5]
ORQ8
- a)[6]
Explain with neat sketch variable refrigerant flow (VRF) air conditioning system.
Also asked:May 2024
- b)[6]
Explain with neat sketch all year round air conditioning system.
Also asked:May 2024
- c)[5]
State the factors to be considered while selecting a system of air conditioning. 4 5
Also asked:May 2024
- a)