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Q=M X CP X DELTA T
M is mass flow rate [kg/s]
CP Specific Heat kJ/(kg*K]
DELTA T for change in temperature [K]
Q = m' x Cp x DeltaT
Q = load
Q = m' x Cp x DeltaT
Q = load
m' = mass flow rate or volume flow rate which is 1 l/s = 1kg/s almost in case of water
DeltaT = temp difference between water in and water out temperature Normally keep it 5.5 - 6.5 Deg C
Thats the basic formula but always keep some factor of safety