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Useful heat gain Formula

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Useful heat gain is defined as the rate of heat transfer to the working fluid. Check FAQs

q u = A p \cdot S flux - q l

q_u - Useful Heat Gain?A_p - Area of Absorber Plate?S_flux - Flux Absorbed by Plate?q_l - Heat Loss from Collector?

Useful heat gain Example

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Here is how the Useful heat gain equation looks like with Values.

Here is how the Useful heat gain equation looks like with Units.

Here is how the Useful heat gain equation looks like.

1111.5 = 13 \cdot 98 - 162.5

1111.5W = 13m² \cdot 98J/sm² - 162.5W

1111.5 = 13 \cdot 98 - 162.5

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Useful heat gain Solution

Follow our step by step solution on how to calculate Useful heat gain?

FIRST Step Consider the formula

q u = A p \cdot S flux - q l

Next Step Substitute values of Variables

∴

q u = 13m² \cdot 98J/sm² - 162.5W

Next Step Convert Units

∴

q u = 13m² \cdot 98W/m² - 162.5W

Next Step Prepare to Evaluate

∴

q u = 13 \cdot 98 - 162.5

LAST Step Evaluate

∴

q u = 1111.5W

Useful heat gain Formula Elements

Variables

Useful Heat Gain

Useful heat gain is defined as the rate of heat transfer to the working fluid.

Symbol: q_u

Measurement: PowerUnit: W

Note: Value can be positive or negative.

Formulas to find Useful Heat Gain

Area of Absorber Plate

Area of absorber plate is defined as the area exposed to the sun that absorbs incident radiation .

Symbol: A_p

Measurement: AreaUnit: m²

Note: Value should be greater than 0.

Formulas to find Area of Absorber Plate

Flux Absorbed by Plate

Flux absorbed by plate is defined as the incident solar flux absorbed in the absorber plate.

Symbol: S_flux

Measurement: Heat Flux DensityUnit: J/sm²

Note: Value can be positive or negative.

Formulas to find Flux Absorbed by Plate

Heat Loss from Collector

Heat loss from collector is defined as the heat losses that occur due to convection, conduction and radiation.

Symbol: q_l

Measurement: PowerUnit: W

Note: Value should be greater than 0.

Formulas to find Heat Loss from Collector

Other formulas in Liquid Flat Plate Collectors category

Go Instantaneous collection efficiency

η i = \frac{q u}{A c \cdot I T}

Go Transmissivity Absorptivity product

τα = τ \cdot \frac{α}{1 - (1 - α) \cdot ρ d}

Go Heat loss from collector

q l = U l \cdot A p \cdot (T pm - T a)

Go Bottom loss coefficient

U b = \frac{K Insulation}{δ b}

How to Evaluate Useful heat gain?

Useful heat gain evaluator uses Useful Heat Gain = Area of Absorber Plate*Flux Absorbed by Plate-Heat Loss from Collector to evaluate the Useful Heat Gain, The Useful heat gain formula is defined as the amount of heat absorbed from the incident radiation from the sun which has further applications. Useful Heat Gain is denoted by q_u symbol.

How to evaluate Useful heat gain using this online evaluator? To use this online evaluator for Useful heat gain, enter Area of Absorber Plate (A_p), Flux Absorbed by Plate (S_flux) & Heat Loss from Collector (q_l) and hit the calculate button.

FAQs on Useful heat gain

What is the formula to find Useful heat gain?

The formula of Useful heat gain is expressed as Useful Heat Gain = Area of Absorber Plate*Flux Absorbed by Plate-Heat Loss from Collector. Here is an example- 1111.5 = 13*98-162.5.

How to calculate Useful heat gain?

With Area of Absorber Plate (A_p), Flux Absorbed by Plate (S_flux) & Heat Loss from Collector (q_l) we can find Useful heat gain using the formula - Useful Heat Gain = Area of Absorber Plate*Flux Absorbed by Plate-Heat Loss from Collector.

Can the Useful heat gain be negative?

Yes, the Useful heat gain, measured in Power can be negative.

Which unit is used to measure Useful heat gain?

Useful heat gain is usually measured using the Watt[W] for Power. Kilowatt[W], Milliwatt[W], Microwatt[W] are the few other units in which Useful heat gain can be measured.

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