Question

Decide which process is mainly responsible for the heat transfer in each of the examples listed below.

a) Heat is absorbed as liquid refrigerant changes to vapour in the pipework. : Evaporation
b) Cool air descending from the freezer compartment takes away heat from the food. : convection
c) Heat is lost to the outside air through the cooling fins at the back. : Convection.
d) Some heat from the kitchen enters the refrigerator through its outer panels. : Convection

Answer 1

Answer:

(a) true

(b) false

(c) true

(d)true

Answer 2

a) Heat is absorbed as liquid refrigerant changes to vapour in the pipework. : Evaporation: true

b) Cool air descending from the freezer compartment takes away heat from the food. : convection:true

c) Heat is lost to the outside air through the cooling fins at the back. : Convection.: true

d) Some heat from the kitchen enters the refrigerator through its outer panels. : Convection false

Explanation:

• there are three ways in which there is transfer of heat. The transfer of heat is known as conduction and convection when there is a material medium for transfer of heat  
• however radiation does not need any material medium for its transfer. Conduction requires a solid media and conviction requires a gaseous or a liquid media. Radiation from the sun proves that it does not require any material medium

To know more,

calculate the heat generated if a charge of 80,000 C is transferred ...

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