Duct Heat Gain Calculator

✖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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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 00.020 seconds)

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Credits

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

Kethavath Srinath has verified this Calculator and 1200+ more calculators!

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Duct Heat Gain Formula

LaTeX Go

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, Duct Heat Gain formula is defined as the total heat gain of a duct in an air distribution system, which is a critical parameter in designing and optimizing heating, ventilation, and air conditioning (HVAC) systems, as it directly affects the overall energy efficiency and indoor air quality. 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?

Duct Heat Gain formula is defined as the total heat gain of a duct in an air distribution system, which is a critical parameter in designing and optimizing heating, ventilation, and air conditioning (HVAC) systems, as it directly affects the overall energy efficiency and indoor air quality 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?

Duct Heat Gain formula is defined as the total heat gain of a duct in an air distribution system, which is a critical parameter in designing and optimizing heating, ventilation, and air conditioning (HVAC) systems, as it directly affects the overall energy efficiency and indoor air quality 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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