B.TechSemester 62024-25Refrigeration And Air ConditioningBME601

Refrigeration And Air Conditioning (BME601) - AKTU Question Paper 2024-25

B.Tech · Semester 6 · Free PDF Download

This is the official AKTU Refrigeration And Air Conditioning Previous Year Question Paper for B.Tech Semester 6, 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 6

Session:2024-25

University:AKTU / UPTU

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Questions Asked in 2024-25

Refrigeration And Air Conditioning (BME601) — extracted question text · 70 marks · 3 Hours

Section AAttempt all questions in brief. 02 x 7 = 14

a
Define Refrigeration Effect and Ton of Refrigeration (TR). 1 K 1
b
Differentiate between Re frigerator and Heat Pump. 1 K 2
c
Why is subcooling done in a vapour compression cycle?
d
What is the significance of DART (Dry Air Rated Temperature ) in aircraft refrigeration?
e
Define term Refrigerant and Absorbent in case of vapour absorp tion refrigeration system
f
What are Ozone Depletion Potential (ODP) and Global Warming Potential (GWP)?
g
Define Sensible Heat Factor (SHF) and Apparatus Dew Point (ADP). 5 K 2

Section BAttempt any three of the following: 07 x 3 = 21

a
Explain the Reversed Carnot Refrigeration Cycle with a T-S diag ram. Why is it not practical for real applications?
b
Compare Boot-Strap and Reduced Ambient aircraft refrigeratio n systems with neat sketches
c
Discuss the effect of superheating and subcooling on the perfor mance of a Vapour Compression Refrigeration System (VCRS)
d
Explain the working principle of a vapour absorption refrigerat ion system with neat sketch. Consider the case of Ammonia -water
e
What are secondary refrigerant s? Compare them with primary refrigerants

Section CAttempt any one part of the following: 07 x 1 = 07

a
In a 5-kW refrigeration system worki ng on a simple VCRS cycle, the refrigerant enters the evaporator with an enthalpy of 75 kJ/kg and leaves at 183 kJ/kg. The enthalpy at the compressor discharge is 210 k J/kg. Calculate:(i) COP (ii) Power consumption (kW) (iii) Rate of heat transfer in the condenser (kW) (iv) Mass flow rate of Refrigerant
b
A VCRS system using R-12 produces 8640 kg of ice/day. The condenser and evaporator temperatures are 48°C and -20°C, respectively. Saturated liquid leaves the condenser, and saturated vapour leaves the ev aporator. The compression is isentropic. Water at 35°C is used to form ic e at -8°C. Heat leakage into the brine tank is 10% of the total heat remov ed. Determine the total power required (kW). (Given: Specific heat of ice = 2.26 kJ/kgK, Latent heat of ice = 334.72 kJ/kg, Specific heat of vapour refrigerant = 0.82 kJ/kgK.)
a
A Bell-Coleman cycle refrigerator operates with air entering th e compressor at 1 bar, -3°C, compressed to 5 bar, cooled to 17°C, and expanded polytropically (PV1.25 = C) to 1 bar. Determine: (i) Refrigeration effect (kJ/kg) (ii) Work input (kJ/kg)(iii) COP
b
A Joule cycle refrigeration syst em has an outlet temperature fr om the cold space at 270 K and turbine inlet at 318 K with a pressure ratio of 4. For 1 TR cooling capacity, determine:(i) Mass flow rate (kg/s) (ii)He at rejection (kW) (iii) Compressor & Turbine work (kW) (iv) COP (v) Volume f low rates at compressor inlet & turbine outlet. Take Cpair = 1.005 KJ/KgK
a
The DBT and WBT of atmospheric a ir are 30°C and 20°C, respectiv ely, at 740 mm Hg . D e t e r m i n e : (i) Partial pressure of water vapour & dew point temperature (ii) Specific humidity (iii) Relative humidity (iv) Vapour density (Given: Saturated pressur e at 30°C is 0.04242 bar and a t 20°C = 0.02337 bar.)
b
A geothermal well (130°C) supplies 100,500 kJ/hr to an absorpti on refrigeration system. The environment is at 30°C, and the refri gerated space is at -22°C. Determine the maximum possible heat removal rate from the refrigerated space
a
Break down the Cooling Load Calculation process by comparing th e relative contributions of wall heat gain, infiltration, and int ernal heat sources. How would you diagnose the dominant factor in a given scenario?
b
Using a psychrometric chart, dem onstrate the adiabatic mixing o f two air streams with given temperature a nd humidity conditions. Calcula te the resulting DBT, WBT, and Specific Humidity, and justify your findings
a
Explain the working of a Steam J et Refrigeration System using a n e a t diagram and classify the key components based on their functions
b
Analyze the key distinctions bet ween vapour compression and vap our absorption refrigeration systems by: (i) Evaluating their energy sour ces in terms of efficiency and practicality (ii) Comparing their theoretica l and practical COP under varyin g conditions (iii) Diagnosing their suitabil ity for specific industrial/comm ercial applications (iv) Assessing their environmenta l impact in terms of refrigera nt emissions and energy sustainability

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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