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Duct Heat Gain Formula

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Duct heat gain is the amount of heat that is increase or decrease due to air from duct. Check FAQs

Q heat gain = U overall \cdot SA Duct \cdot TC

Q_{heat gain} - Duct Heat Gain?U_overall - Overall Heat Transfer Coefficient?SA_Duct - Surface Area of Duct?TC - Temperature Change Between Outdoor and Inside air?

Duct Heat Gain Example

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Here is how the Duct Heat Gain equation looks like with Values.

Here is how the Duct Heat Gain equation looks like with Units.

Here is how the Duct Heat Gain equation looks like.

2493.6449 = 0.25 \cdot 120 \cdot 12

2493.6449Btu/h = 0.25W/m²*K \cdot 120ft² \cdot 12°F

2493.6449 = 0.25 \cdot 120 \cdot 12

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Duct Heat Gain Solution

Follow our step by step solution on how to calculate Duct Heat Gain?

FIRST Step Consider the formula

Q heat gain = U overall \cdot SA Duct \cdot TC

Next Step Substitute values of Variables

∴

Q heat gain = 0.25W/m²*K \cdot 120ft² \cdot 12°F

Next Step Convert Units

∴

Q heat gain = 0.25W/m²*K \cdot 11.1484m² \cdot 262.0389K

Next Step Prepare to Evaluate

∴

Q heat gain = 0.25 \cdot 11.1484 \cdot 262.0389

Next Step Evaluate

∴

Q heat gain = 730.326262798134W

Next Step Convert to Output's Unit

∴

Q heat gain = 2493.64494345997Btu/h

LAST Step Rounding Answer

∴

Q heat gain = 2493.6449Btu/h

Duct Heat Gain Formula Elements

Variables

Duct Heat Gain

Duct heat gain is the amount of heat that is increase or decrease due to air from duct.

Symbol: Q_{heat gain}

Measurement: PowerUnit: Btu/h

Note: Value can be positive or negative.

Formulas to find Duct Heat Gain

Overall Heat Transfer Coefficient

The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat.

Symbol: U_overall

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value should be greater than 0.

Formulas to find Overall Heat Transfer Coefficient

Surface Area of Duct

Surface area of duct is the sum of the areas of all faces of the duct.

Symbol: SA_Duct

Measurement: AreaUnit: ft²

Note: Value should be greater than 0.

Formulas to find Surface Area of Duct

Temperature Change Between Outdoor and Inside air

Temperature change between outdoor and inside air is the temperature difference between air outdoor and inside of the specified space.

Symbol: TC

Measurement: TemperatureUnit: °F

Note: Value can be positive or negative.

Formulas to find Temperature Change Between Outdoor and Inside air

Other formulas in Heat Gain category

Go Latent Heat Gain from people

Q l = q l \cdot n

Go Latent Heat Gain per person using Latent Heat Gain from people

q l = \frac{Q l}{n}

Go Latent cooling load from ventilation air

Q L = 0.68 \cdot CFM \cdot (W' o - W' i)

Go Sensible Heat Gain from people

Q S = q s \cdot n \cdot CLF

How to Evaluate Duct Heat Gain?

Duct Heat Gain evaluator uses Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature Change Between Outdoor and Inside air to evaluate 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 evaluate Duct Heat Gain using this online evaluator? To use this online evaluator 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.

FAQs on Duct Heat Gain

What is the formula to find Duct Heat Gain?

The formula of Duct Heat Gain is expressed as Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature Change Between Outdoor and Inside air. Here is an example- 8514.366 = 0.25*11.1483648000892*262.038882255554.

How to calculate Duct Heat Gain?

With Overall Heat Transfer Coefficient (U_overall), Surface Area of Duct (SA_Duct) & Temperature Change Between Outdoor and Inside air (TC) we can find Duct Heat Gain using the formula - Duct Heat Gain = Overall Heat Transfer Coefficient*Surface Area of Duct*Temperature Change Between Outdoor and Inside air.

Can the Duct Heat Gain be negative?

Yes, the Duct Heat Gain, measured in Power can be negative.

Which unit is used to measure Duct Heat Gain?

Duct Heat Gain is usually measured using the Btu (th) per Hour[Btu/h] for Power. Watt[Btu/h], Kilowatt[Btu/h], Milliwatt[Btu/h] are the few other units in which Duct Heat Gain can be measured.

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