Exam Details
| Subject | Refrigeration And Air Conditioning | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
Explain the vapour compression refrigeration cycle with the help of T-s and p-h diagrams.
Discuss the effect of superheat and sub-cooling on the vapour compression refrigeration cycle.
What are the different types of compressors used in vapour compression plants Explain with their applications.
Derive an expression of COP for an air refrigeration system based on reversed Brayton cycle.
What do you understand by cascade refrigeration system? Explain it with the help of a flow chart and T-s diagram.
An air-water vapour mixture enters an adiabatic saturator at 30°C and leaves at 20°C, which is the adiabatic saturation temperature. The pressure remains constant at 100 kPa. Determine the relative humidity and the humidity ratio of the inlet mixture.
Derive an expression for the maximum COP of an absorption refrigeration system.
What do you understand by dry bulb and wet bulb temperature?
What do you understand by saturated and unsaturated air Also state their importance.
Give the comparison between a vapour compression refrigeration system and a vapour absorption refrigeration system.
A refrigeration cycle uses Freon-12 as the working fluid. The temperature of the refrigerant in the evaporator is -10°C. The condensing temperature is 40°C. The cooling load is 150 W and the volumetric efficiency of the compressor is 80%. The speed of the compressor is 720 rpm. Calculate the mass flow rate of the refrigerant and the displacement volume of the compressor.
<img src='./qimages/11388-6a.jpg'>
An ice plant produces 10 tonnes of ice per day at using water at room temperature of 20°C. Estimate the power rating of the compressor motor, if the COP of the plant is 2·5 and overall electromechanical efficiency is
90%. Take latent heat of freezing for water 335 kJ/kg. Specific heat of water =4·18 kJ/kg.
The capacity of the refrigerator (working on reversed Carnot cycle) is 280 tonnes when operating between -10°C and 25°C.
Determine:
Quantity of ice produced within 24 hours, when water is supplied at 20°C,
Minimum power (in kW) required.
The temperature in a refrigerator coil is 267 K and that in the condenser coil is 295 K Assuming that the machine operates on the reversed Carnot cycle,
calculate:
The COP of the refrigerator,
The refrigerating effect per kW of input work, and
The heat rejected to the condenser.
8. Write short notes on any four of the following:
Cooling and Dehumidification
Electrolux Refrigerator
Dew Point
Steam Ejector Refrigeration
Refrigerant
Winter Air Conditioning System
Discuss the effect of superheat and sub-cooling on the vapour compression refrigeration cycle.
What are the different types of compressors used in vapour compression plants Explain with their applications.
Derive an expression of COP for an air refrigeration system based on reversed Brayton cycle.
What do you understand by cascade refrigeration system? Explain it with the help of a flow chart and T-s diagram.
An air-water vapour mixture enters an adiabatic saturator at 30°C and leaves at 20°C, which is the adiabatic saturation temperature. The pressure remains constant at 100 kPa. Determine the relative humidity and the humidity ratio of the inlet mixture.
Derive an expression for the maximum COP of an absorption refrigeration system.
What do you understand by dry bulb and wet bulb temperature?
What do you understand by saturated and unsaturated air Also state their importance.
Give the comparison between a vapour compression refrigeration system and a vapour absorption refrigeration system.
A refrigeration cycle uses Freon-12 as the working fluid. The temperature of the refrigerant in the evaporator is -10°C. The condensing temperature is 40°C. The cooling load is 150 W and the volumetric efficiency of the compressor is 80%. The speed of the compressor is 720 rpm. Calculate the mass flow rate of the refrigerant and the displacement volume of the compressor.
<img src='./qimages/11388-6a.jpg'>
An ice plant produces 10 tonnes of ice per day at using water at room temperature of 20°C. Estimate the power rating of the compressor motor, if the COP of the plant is 2·5 and overall electromechanical efficiency is
90%. Take latent heat of freezing for water 335 kJ/kg. Specific heat of water =4·18 kJ/kg.
The capacity of the refrigerator (working on reversed Carnot cycle) is 280 tonnes when operating between -10°C and 25°C.
Determine:
Quantity of ice produced within 24 hours, when water is supplied at 20°C,
Minimum power (in kW) required.
The temperature in a refrigerator coil is 267 K and that in the condenser coil is 295 K Assuming that the machine operates on the reversed Carnot cycle,
calculate:
The COP of the refrigerator,
The refrigerating effect per kW of input work, and
The heat rejected to the condenser.
8. Write short notes on any four of the following:
Cooling and Dehumidification
Electrolux Refrigerator
Dew Point
Steam Ejector Refrigeration
Refrigerant
Winter Air Conditioning System
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
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Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
- I.C. Engines
- Industrial Engineering
- Industrial Ergonomics
- Industrial Measurement And Quality Control
- Industrial Organization And Management
- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
- Metrology And Quality Control
- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.