Home
Class 11
PHYSICS
What is coefficient of performance of a ...

What is coefficient of performance of a refrigerator ?

Text Solution

Verified by Experts

It is the ratio of heat extracted `Q_2` in the refrigerator to the work done W on the refrigerant. It is denoted by `alpha`.
Promotional Banner

Topper's Solved these Questions

  • THERMODYANMICS

    KUMAR PRAKASHAN|Exercise Section-F Questions from Module|20 Videos

  • THERMAL PROPERTIES OF MATTER

    KUMAR PRAKASHAN|Exercise Question Paper (Section - D) (Answer following in brief :) Each carry 4 marks|1 Videos

  • UNITS AND MEASUREMENT

    KUMAR PRAKASHAN|Exercise Section -F (Questions from Module )|20 Videos

Similar Questions

Explore conceptually related problems

Why the coefficient of performance of a refrigerator never be infinite ?

Can the coefficient of performance of a refrigerator be increased by increasing the mass of working substance ?

Define and write the formula for coefficient of performance of a refrigerator.

A refrigerator is to maintain eatables kept inside at 9^@ C. If room temperature is 36^@ C , calculate the coefficient of performance of refrigerator.

Why the coefficient of performance of refrigerator become infinity ?

If the coefficient of performance of a refrigerator is 5 and operates at the room temperature (27^@C) , find the temperature inside the refrigerator.

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is - 20^@ C , the temperature of the surroundings to which it rejects heat is _____

Is the coefficient of performance of refrigerator constant ?

Refrigerator is an apparatus which takes heat from a cold body, work is done on it and the work done together with the heat absorbed is rejected to the source. An ideal refrigerator can be regarded as Carnot's ideal heat engine working in the reverse direction. The coefficient of performance of refrigerator is defined as beta = ("Heat extracted from cold reservoir")/("work done on working substance") = (Q_(2))/(W) = (Q_(2))/(Q_(1)- Q_(2)) = (T_(2))/(T_(1) - T_(2)) A Carnot's refrigerator takes heat from water at 0^(@)C and discards it to a room temperature at 27^(@)C . 1 Kg of water at 0^(@)C is to be changed into ice at 0^(@)C. (L_(ice) = 80"kcal//kg") What is the coefficient of performance of the machine?

Refrigerator is an apparatus which takes heat from a cold body, work is done on it and the work done together with the heat absorbed is rejected to the source. An ideal refrigerator can be regarded as Carnot's ideal heat engine working in the reverse direction. The coefficient of performance of refrigerator is defined as beta = ("Heat extracted from cold reservoir")/("work done on working substance") = (Q_(2))/(W) = (Q_(2))/(Q_(1)- Q_(2)) = (T_(2))/(T_(1) - T_(2)) A Carnot's refrigerator takes heat from water at 0^(@)C and discards it to a room temperature at 27^(@)C . 1 Kg of water at 0^(@)C is to be changed into ice at 0^(@)C. (L_(ice) = 80"kcal//kg") What is the work done by the refrigerator in this process ( 1 "cal" = 4.2 "joule" )