Heat Load Formula and Examples

Heat Load Formula :

The heat load formula is Q(kw) in Kelvin per watts is equal the product of mass m(kg/s) in kilogram per second and multiply the specific heat cp(kj/kgk/kj/kg0c) in kilojoule per kilogram Kelvin or degree Celsius and multiply the change in temperature ΔT(k or0c) in Kelvin or degree Celsius. Hence the Heat Load Formula can be written as

Heat load =Q(kw)=m(kg/s)*cp(kj/kgk/kj/kg0c)*ΔT(k or0c)

Where,

Q→ Heat load in kw

M→ mass flow rate in kg/s

Cp→ specific heat  in KJ/Kg k or kJ/Kg0C

ΔT →change in temperature in K or 0C

Sample Problems :

Example 1 :

Calculate the heat load in the electric convector in which the rate of mass flow is 4.50 and Cp is 2000 and the enthalpy is from 30.50 to 26.55.

Solution :

Given,

M=4.50

Cp=2000

T1=30.50

T2=26.55

Heat load Q=m*cp*ΔT

Q=4.50*2000*(30.50-26.55)

Q=35550W

Example 2:

Calculate the heat load in the electric convector in which the rate of mass flow is 8.30 and Cp is 3000 and the enthalpy is from 45.00 to 48.50.

Solution :

Given,

M=8.30

Cp=3000

T1=45.00

T2=48.50

Heat load Q=m*cp*ΔT

Q=8.30*3000*(45.00-48.50)

Q= 112045W

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