Heat power calculator

for heaters and chillers

online since 2005

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Action
Calculation setup
Flow rates and heat power
Diameter and velocity
Temperatures
Fluid properties

Exclusive calculator

On exclusive calculator page you can use the online calculator without interference from advertisements, additional text, links and other content that is not required for the calculations themselves. A pure experience of using a calculator as with a desktop application.

An exclusive version of the calculator is available to registered users. Choose the right subscription duration and start using the exclusive service.

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Description

P - heat power
Heat energy in the unit of time exchanged in the device.
q - volume flow
Volume flow rate of the fluid at actual pressure and temperature.
ṁ - mass flow rate
Fluid flow rate in terms of units of mass per unit of time
T1 - inlet temperature
Fluid temperature in front of the heat exchanger
T2 - outlet temperature
Fluid temperature after the heat exchanger
ΔT - temperature change
Fluid temperature difference before and after the heat exchanger. Gained or lost temperature depending if the device is a heater or a chiller
ρ - fluid density
Actual fluid density in terms of mass per unit of volume on real pressure and the temperature
C - specific heat
Heat capacity (specific heat) of the fluid; Specific heat at constant pressure for a gas, in terms of energy per unit of mass and temperature.
D - diameter of tube
Internal pipe diameter
V - flow velocity
Fluid flow velocity in the pipe of the heat exchanger

Calculation setup

Select calculation type
P
Calculate heat power for known flow rate
q / ṁ
Calculate flow rate for known heat power
Select value to input. You should enter selected one. The other one will be calculated
q
volume flow rate
mass flow rate
Select value to input. You should enter selected one. The other one will be calculated
T2
temperature after the heater/chiller
ΔT
temperature difference in the device
Select value to input. You should enter selected one. The other one will be calculated
D
internal pipe diameter
V
fluid velocity
Select device type
Heater
Device that has outlet temperature lower then inlet one, due to heat energy released from the fluid to the surrounding one
Chiller
Device that has outlet temperature higher then inlet one, due to heat energy of the fluid increased and surrounding fluid chilled

Exclusive calculator

On exclusive calculator page you can use the online calculator without interference from advertisements, additional text, links and other content that is not required for the calculations themselves. A pure experience of using a calculator as with a desktop application.

An exclusive version of the calculator is available to registered users. Choose the right subscription duration and start using the exclusive service.

Exclusive

Available in download version

save/open multiple results
export to word and excel
print results
custom fluid properties
K factor for fittings, resistance coefficient
pipe surface roughness selection
select between gauge and absolute pressure
compressible isothermal flow
dry air isothermal flow
gas offtake flow
natural gas flow

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Issues and answers

Having problems with calculators usage? Read more about known issues and problems and way to solve it.

Issues and answers

Watch how calculator can help you resolve task in less than a minute

HeaterWaterQ, T1, T2, dP

Example #13

Task: Calculate the heat output of the heat exchanger if the water flow is 2 l/s, the temperature in front of the exchanger is 25 C, and behind the exchanger is 60 C. The diameter of the connecting pipes is 60 mm.

Solution: Heat output: 292.43 kW

HeaterWaterP, T1, T2, dQ

Example #14

Task: Calculate the flow of water through the heat exchanger if the heat output of the exchanger is 2000 kW. The temperature in front and behind the exchanger is 70 C and 90 C. The diameter of the connecting pipes is 150 mm.

Solution: Flow rate: 86.173 m3/h

ChillerWaterP, T1, T2, dQ

Example #15

Task: Calculate the flow of water through the chiller if the output of the chiller is 2000 kW. The temperature in front and behind the chiller is 12 C and 7 C. Calculate also the diameter of the connecting pipes for a known water flow rate of 1 m/s.

Solution: Flow rate: 344.96 m3/h

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