Duct Heat Gain Calculator

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Heat Gain

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✖The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat.ⓘ Overall Heat Transfer Coefficient [U_overall]			+10% -10%
✖Surface area of duct is the sum of the areas of all faces of the duct.ⓘ Surface Area of Duct [SA_Duct]			+10% -10%
✖Temperature change between outdoor and inside air is the temperature difference between air outdoor and inside of the specified space.ⓘ Temperature change between Outdoor and Inside air [TC]			+10% -10%

✖Duct heat gain is the amount of heat that is increase or decrease due to air from duct.ⓘ Duct Heat Gain [Q_{heat gain}]

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Formula

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Duct Heat Gain

Formula

`"Q"_{"heat gain"} = "U"_{"overall"}*"SA"_{"Duct"}*"TC"`

Example

`"2493.645Btu/h"="0.25W/m²*K"*"120ft²"*"12°F"`

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Duct Heat Gain Solution

STEP 0: Pre-Calculation Summary

Formula Used

Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature change between Outdoor and Inside air
Q_{heat gain} = U_overall*SA_Duct*TC
This formula uses 4 Variables

Variables Used

Duct Heat Gain - (Measured in Watt) - Duct heat gain is the amount of heat that is increase or decrease due to air from duct.
Overall Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat.
Surface Area of Duct - (Measured in Square Meter) - Surface area of duct is the sum of the areas of all faces of the duct.
Temperature change between Outdoor and Inside air - (Measured in Kelvin) - Temperature change between outdoor and inside air is the temperature difference between air outdoor and inside of the specified space.

STEP 1: Convert Input(s) to Base Unit

Overall Heat Transfer Coefficient: 0.25 Watt per Square Meter per Kelvin --> 0.25 Watt per Square Meter per Kelvin No Conversion Required
Surface Area of Duct: 120 Square Foot --> 11.1483648000892 Square Meter (Check conversion here)
Temperature change between Outdoor and Inside air: 12 Fahrenheit --> 262.038882255554 Kelvin (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Q_{heat gain} = U_overall*SA_Duct*TC --> 0.25*11.1483648000892*262.038882255554

Evaluating ... ...

Q_{heat gain} = 730.326262798134

STEP 3: Convert Result to Output's Unit

730.326262798134 Watt -->2493.64494345997 Btu (th) per Hour (Check conversion here)

FINAL ANSWER

2493.64494345997 ≈ 2493.645 Btu (th) per Hour <-- Duct Heat Gain

(Calculation completed in 00.004 seconds)

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Created by Rudrani Tidke

Cummins College of Engineering for Women (CCEW), Pune

Rudrani Tidke has created this Calculator and 100+ more calculators!

Verified by Kethavath Srinath

Osmania University (OU), Hyderabad

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< 9 Heat Gain Calculators

Latent cooling load from ventilation air

Go Latent cooling load from ventilation air in BTU/hr = 0.68*Air ventilation rate in Cubic foot per minute*(Outside Humidity Ratio-Inside humidity ratio)

Duct Heat Gain

Go Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature change between Outdoor and Inside air

Heat Gain through Partition, Floor or Ceiling

Go Heat Gain = Heat Transfer Coefficient for Interior Structure*Surface Area of Duct*Cooling Load Temperature Difference

Sensible Heat Gain per people using Sensible Heat Gain from people

Go Sensible Heat Gains per person = Sensible Heat Gain from people/(Number of people*Cooling Load Factor for people)

Sensible Heat Gain from people

Go Sensible Heat Gain from people = Sensible Heat Gains per person*Number of people*Cooling Load Factor for people

Sensible Cooling Load Heat Gain through Structure

Go Sensible Cooling Load = Overall Heat Transfer Coefficient*Surface Area*Cooling Load Temperature Difference

Latent Heat Gain per person using Latent Heat Gain from people

Go Latent heat gains per person = Latent Heat Gain/Number of people

Latent Heat Gain from people

Go Latent Heat Gain = Latent heat gains per person*Number of people

Cooling load Heat Gain through windows

Go Sensible Cooling Load = Area of Glass*Glass Load Factor

Duct Heat Gain Formula

Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature change between Outdoor and Inside air
Q_{heat gain} = U_overall*SA_Duct*TC

How many CFM can a 4 duct handle?

The minimum duct size for a range hood is 4”, which is ideal for range hoods 400 CFM and under. The higher the cubic feet per minute, the larger the duct you'll need.

How to Calculate Duct Heat Gain?

Duct Heat Gain calculator uses Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature change between Outdoor and Inside air to calculate the Duct Heat Gain, The Duct Heat Gain formula is defined as the heat that is increased or decreased in the conditioned space due to air through duct. Duct Heat Gain is denoted by Q_{heat gain} symbol.

How to calculate Duct Heat Gain using this online calculator? To use this online calculator for Duct Heat Gain, enter Overall Heat Transfer Coefficient (U_overall), Surface Area of Duct (SA_Duct) & Temperature change between Outdoor and Inside air (TC) and hit the calculate button. Here is how the Duct Heat Gain calculation can be explained with given input values -> 8514.366 = 0.25*11.1483648000892*262.038882255554.

FAQ

What is Duct Heat Gain?

The Duct Heat Gain formula is defined as the heat that is increased or decreased in the conditioned space due to air through duct and is represented as Q_{heat gain} = U_overall*SA_Duct*TC or Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature change between Outdoor and Inside air. The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat, Surface area of duct is the sum of the areas of all faces of the duct & Temperature change between outdoor and inside air is the temperature difference between air outdoor and inside of the specified space.

How to calculate Duct Heat Gain?

The Duct Heat Gain formula is defined as the heat that is increased or decreased in the conditioned space due to air through duct is calculated using Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature change between Outdoor and Inside air. To calculate Duct Heat Gain, you need Overall Heat Transfer Coefficient (U_overall), Surface Area of Duct (SA_Duct) & Temperature change between Outdoor and Inside air (TC). With our tool, you need to enter the respective value for Overall Heat Transfer Coefficient, Surface Area of Duct & Temperature change between Outdoor and Inside air and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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