B.TechSemester 72024-25Hvac SystemsKME072

Hvac Systems (KME072) - AKTU Question Paper 2024-25

B.Tech · Semester 7 · Free PDF Download

This is the official AKTU Hvac Systems Previous Year Question Paper for B.Tech Semester 7, academic session 2024-25. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 7

Session:2024-25

University:AKTU / UPTU

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Questions Asked in 2024-25

Hvac Systems (KME072) — extracted question text · 100 marks · 3 Hours

Section AAttempt all questions in brief. 2 x 10 = 20

a
Define the effect of superheating on the COP of a vapour compression cycle
b
What are Hydrofluoro-Olefins, and why are they considered futur e refrigerants?
c
Explain the significance of Appa ratus Dew Point (ADP) in air co nditioning systems
d
What is the bypass factor in a cooling coil? Explain its importance
e
Differentiate between unitary and central air conditioning systems
f
Describe the purpose of mechanical ventilation in buildings
g
What is the shading device? Explain its role in reducing heat gain
h
Define the stack effect in infiltration load calculations. 4 K1 i. What is the equal friction method in duct design? 5 K2 j. Differentiate between centrifugal and axial fans

Section BAttempt any three of the following: 10 x 3 = 30

a
Draw and explain the transcritic al vapour compression refrigeration cycle on
b
Describe the psychrometric processes involved in summer air conditioning
c
Discuss the advantages and limitations of decentralized heat pu mps in industrial applications
d
Derive an expression to calculate the heat transfer through wal l s u s i n g t h e decrement factor
e
Explain the velocity reduction method for duct design with its applications

Section CAttempt any one part of the following: 10 x 1 = 10

a
Explain the classification of refrigerants based on safety stan dards with examples
b
Show that, for t 0 = –15°C and t k = 30°C, for isobutane the suction state for maximum COP lies in the superheat region
a
Explain the working principle of an air washer with a hygroscopic solution
b
Saturated steam at standard atmospheric pressure is injected into a passing air stream in an amount sufficient to raise the absolute humidity f rom 0.0057 to 0.0143 kg w.v./kg d.a. If the air enters the humidifier at 21°C DBT, determine its leaving state
a
Explain the working of a double-bundle condenser in heat pumps
b
A simple saturation ammonia compression system has a high pressure of 1.35 MN/m2 a n d a l o w p r e s s u r e o f 0 . 1 9 M N / m2. Find per 400,000 kJ/h of refrigerating capacity, the power consumption of the compressor and COP of the cycle
a
Calculate the heat gain through a glass window using solar radiation data
b
Explain the concept of energy conservation in air-conditioned buildings
a
Describe the mechanism of flow through supply air outlets in duct systems
b
Discuss the causes and solutions t o vibration and noise in air conditioning piping systems

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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