We were discussing various basic concepts of thermodynamics
such as thermodynamic system, boundary and surrounding and also we have seen thermodynamic equilibrium, intensive and extensive properties in our previous
post.
Today we will see here the very important and basic
term used in thermodynamics i.e. thermal reservoir in our thermal engineering category
with the help of this post.
Let us see thermal reservoir
Thermal reservoir or thermal energy reservoir is
also termed as thermal bath and it is basically defined as a system with
infinite capacity and with constant temperature. Temperature of thermal
reservoir will never be affected due to transfer of quantity of heat energy
from it or to it.
Thermal reservoir will either provide the heat
energy or receive the heat energy but its temperature will be remaining
constant.
Thermal reservoir which will be at higher
temperature will be termed as heat source and it will give the heat energy to
the system. Whereas thermal reservoir which will be at lower temperature will
be termed as heat sink and it will receive the heat energy to the system but we
must note it here that temperature of heat source or heat sink will be
remaining constant.
Thermal
energy reservoir: Heat source and heat sink
Let us see one example, ocean could be considered as
thermal reservoir. Let us assume that
we are pouring 5 or 10 liter worm water in to the ocean and after that
we are measuring the temperature of ocean water.
Is temperature of ocean water will be increased?
Your answer will be surely no because ocean will be the infinite capacity
system and its temperature will never be affected due to the addition of heat
energy in terms of 5 or 10 liter worm water.
In simple words, we can say that thermal reservoir
is basically defined as the constant temperature and infinite capacity system
which will receive the heat energy from the system or will provide the heat
energy to the system but its temperature will be remaining constant.
Atmospheric air, boiler furnace, river and
combustion chamber another example of thermal reservoir could be seen.
Do you have suggestions? Please write in comment box
we will see another topic in our next post i.e. “Carnot heat engine and concept of entropy in thermodynamics”
we will see another topic in our next post i.e. “Carnot heat engine and concept of entropy in thermodynamics”
Reference:
Engineering thermodynamics by P.K. Nag
Image courtesy: Google
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