Transmissivity Absorptivity product Calculator

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✖Transmissivity is the fraction of incident radiation flux transmitted through the body.ⓘ Transmissivity [τ]			+10% -10%
✖Absorptivity is the fraction of incident radiation flux absorbed by the body.ⓘ Absorptivity [α]			+10% -10%
✖Diffuse reflectivity is the reduction in reflected power caused by the introduction of an absorbing material.ⓘ Diffuse Reflectivity [ρ_d]			+10% -10%

✖Transmissivity - Absorptivity product is defined as the ratio of flux absorbed in the absorber plate to the flux incident on cover system.ⓘ Transmissivity Absorptivity product [τα]

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Formula

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Transmissivity Absorptivity product

Formula

`"τα" = "τ"*"α"/(1-(1-"α")*"ρ"_{"d"})`

Example

`"0.174731"="0.25"*"0.65"/(1-(1-"0.65")*"0.2")`

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Transmissivity Absorptivity product Solution

STEP 0: Pre-Calculation Summary

Formula Used

Transmissivity - Absorptivity product = Transmissivity*Absorptivity/(1-(1-Absorptivity)*Diffuse Reflectivity)
τα = τ*α/(1-(1-α)*ρ_d)
This formula uses 4 Variables

Variables Used

Transmissivity - Absorptivity product - Transmissivity - Absorptivity product is defined as the ratio of flux absorbed in the absorber plate to the flux incident on cover system.
Transmissivity - Transmissivity is the fraction of incident radiation flux transmitted through the body.
Absorptivity - Absorptivity is the fraction of incident radiation flux absorbed by the body.
Diffuse Reflectivity - Diffuse reflectivity is the reduction in reflected power caused by the introduction of an absorbing material.

STEP 1: Convert Input(s) to Base Unit

Transmissivity: 0.25 --> No Conversion Required
Absorptivity: 0.65 --> No Conversion Required
Diffuse Reflectivity: 0.2 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

τα = τ*α/(1-(1-α)*ρ_d) --> 0.25*0.65/(1-(1-0.65)*0.2)

Evaluating ... ...

τα = 0.174731182795699

STEP 3: Convert Result to Output's Unit

0.174731182795699 --> No Conversion Required

FINAL ANSWER

0.174731182795699 ≈ 0.174731 <-- Transmissivity - Absorptivity product

(Calculation completed in 00.004 seconds)

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< 10+ Liquid Flat Plate Collectors Calculators

Collection efficiency when collector efficiency factor is present

Go Instantaneous Collection Efficiency = (Collector Efficiency Factor*(Area of absorber plate/Gross Collector Area)*Average Transmissivity-absorptivity Product)-(Collector Efficiency Factor*Area of absorber plate*Overall loss coefficient*(Average of Inlet and Outlet Temperature of fluid-Ambient Air Temperature)*1/Flux Incident on Top Cover)

Collection efficiency when heat removal factor is present

Go Instantaneous Collection Efficiency = Collector heat removal factor*(Area of absorber plate/Gross Collector Area)*(Flux absorbed by plate/Flux Incident on Top Cover-((Overall loss coefficient*(Inlet fluid temperature flat plate collector-Ambient Air Temperature))/Flux Incident on Top Cover))

Collector heat removal factor

Go Collector heat removal factor = (Mass Flow Rate*Specific Heat Capacity at Constant Pressure)/(Overall loss coefficient*Gross Collector Area)*(1-e^(-(Collector Efficiency Factor*Overall loss coefficient*Gross Collector Area)/(Mass Flow Rate*Specific Heat Capacity at Constant Pressure)))

Collection efficiency when average transmissivity-absorptivity product is present

Go Instantaneous Collection Efficiency = Collector heat removal factor*(Area of absorber plate/Gross Collector Area)*(Average Transmissivity-absorptivity Product-(Overall loss coefficient*(Inlet fluid temperature flat plate collector-Ambient Air Temperature))/Flux Incident on Top Cover)

Heat loss from collector

Go Heat Loss from Collector = Overall loss coefficient*Area of absorber plate*(Average temperature of absorber plate-Ambient Air Temperature)

Collection efficiency when fluid temperature is present

Go Instantaneous Collection Efficiency = (0.692-4.024*(Inlet fluid temperature flat plate collector-Ambient Air Temperature))/Flux Incident on Top Cover

Transmissivity Absorptivity product

Go Transmissivity - Absorptivity product = Transmissivity*Absorptivity/(1-(1-Absorptivity)*Diffuse Reflectivity)

Instantaneous collection efficiency

Go Instantaneous Collection Efficiency = Useful heat gain/(Gross Collector Area*Flux Incident on Top Cover)

Useful heat gain

Go Useful heat gain = Area of absorber plate*Flux absorbed by plate-Heat Loss from Collector

Bottom loss coefficient

Go Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation

Transmissivity Absorptivity product Formula

Transmissivity - Absorptivity product = Transmissivity*Absorptivity/(1-(1-Absorptivity)*Diffuse Reflectivity)
τα = τ*α/(1-(1-α)*ρ_d)

Reason of actual heat absorbed in the absorber

The fraction of solar radiation that is transmitted through the cover
and the fraction of this transmitted radiation that is absorbed in the
absorber.

How to Calculate Transmissivity Absorptivity product?

Transmissivity Absorptivity product calculator uses Transmissivity - Absorptivity product = Transmissivity*Absorptivity/(1-(1-Absorptivity)*Diffuse Reflectivity) to calculate the Transmissivity - Absorptivity product, The Transmissivity Absorptivity product formula is defined as the ratio of the flux absorbed in the absorber plate to the flux incident on the cover system. Transmissivity - Absorptivity product is denoted by τα symbol.

How to calculate Transmissivity Absorptivity product using this online calculator? To use this online calculator for Transmissivity Absorptivity product, enter Transmissivity (τ), Absorptivity (α) & Diffuse Reflectivity (ρ_d) and hit the calculate button. Here is how the Transmissivity Absorptivity product calculation can be explained with given input values -> 0.174731 = 0.25*0.65/(1-(1-0.65)*0.2).

FAQ

What is Transmissivity Absorptivity product?

The Transmissivity Absorptivity product formula is defined as the ratio of the flux absorbed in the absorber plate to the flux incident on the cover system and is represented as τα = τ*α/(1-(1-α)*ρ_d) or Transmissivity - Absorptivity product = Transmissivity*Absorptivity/(1-(1-Absorptivity)*Diffuse Reflectivity). Transmissivity is the fraction of incident radiation flux transmitted through the body, Absorptivity is the fraction of incident radiation flux absorbed by the body & Diffuse reflectivity is the reduction in reflected power caused by the introduction of an absorbing material.

How to calculate Transmissivity Absorptivity product?

The Transmissivity Absorptivity product formula is defined as the ratio of the flux absorbed in the absorber plate to the flux incident on the cover system is calculated using Transmissivity - Absorptivity product = Transmissivity*Absorptivity/(1-(1-Absorptivity)*Diffuse Reflectivity). To calculate Transmissivity Absorptivity product, you need Transmissivity (τ), Absorptivity (α) & Diffuse Reflectivity (ρ_d). With our tool, you need to enter the respective value for Transmissivity, Absorptivity & Diffuse Reflectivity 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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