Thermal energy Reservoir:
It is a body of infinite heat capacity which has able to absorbing or rejecting an heat with out effecting its temperature.This is called Thermal Energy Reservoir.
In this high temperature is known has heat source.
In this low temperature is known as heat sink.
1.Heat source:
it is used to supply energy in the form of heat
Eg: Sun, Nuclear Reactor,
2.Heat Sink:
It is to absorb energy in the form of heat
Eg: River, Ocean Water
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