By-Pass Factor of Heating Coil Calculator

✖Overall heat transfer coefficient is the overall convective heat transfer between a fluid medium (a fluid) and the surface (wall) flowed over by the fluid.ⓘ Overall Heat Transfer Coefficient [U]			+10% -10%
✖The Surface Area of Coil is the total area of the coil through which any fluid passes.ⓘ Surface Area of Coil [A_c]			+10% -10%
✖Mass of Air is both a property of air and a measure of its resistance to acceleration when a net force is applied.ⓘ Mass of Air [m_air]			+10% -10%
✖Specific Heat Capacity is the heat required to raise the temperature of the unit mass of a given substance by a given amount.ⓘ Specific Heat Capacity [c]			+10% -10%

✖By Pass Factor is the inability of a coil to cool or heat the air to its temperature.ⓘ By-Pass Factor of Heating Coil [BPF]

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Formula

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By-Pass Factor of Heating Coil

Formula

BPF = \exp (- \frac{U \cdot A c}{m air \cdot c})

Example

0.88032 = \exp (- \frac{50 W/m²*K \cdot 64 m²}{6 kg \cdot 4.184 kJ/kg*K})

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By-Pass Factor of Heating Coil Solution

STEP 0: Pre-Calculation Summary

Formula Used

By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity))
BPF = exp(-(U*A_c)/(m_air*c))
This formula uses 1 Functions, 5 Variables

Functions Used

exp - n an exponential function, the value of the function changes by a constant factor for every unit change in the independent variable., exp(Number)

Variables Used

By Pass Factor - By Pass Factor is the inability of a coil to cool or heat the air to its temperature.
Overall Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - Overall heat transfer coefficient is the overall convective heat transfer between a fluid medium (a fluid) and the surface (wall) flowed over by the fluid.
Surface Area of Coil - (Measured in Square Meter) - The Surface Area of Coil is the total area of the coil through which any fluid passes.
Mass of Air - (Measured in Kilogram) - Mass of Air is both a property of air and a measure of its resistance to acceleration when a net force is applied.
Specific Heat Capacity - (Measured in Joule per Kilogram per K) - Specific Heat Capacity is the heat required to raise the temperature of the unit mass of a given substance by a given amount.

STEP 1: Convert Input(s) to Base Unit

Overall Heat Transfer Coefficient: 50 Watt per Square Meter per Kelvin --> 50 Watt per Square Meter per Kelvin No Conversion Required
Surface Area of Coil: 64 Square Meter --> 64 Square Meter No Conversion Required
Mass of Air: 6 Kilogram --> 6 Kilogram No Conversion Required
Specific Heat Capacity: 4.184 Kilojoule per Kilogram per K --> 4184 Joule per Kilogram per K (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

BPF = exp(-(U*A_c)/(m_air*c)) --> exp(-(50*64)/(6*4184))

Evaluating ... ...

BPF = 0.880320066293238

STEP 3: Convert Result to Output's Unit

0.880320066293238 --> No Conversion Required

FINAL ANSWER

0.880320066293238 ≈ 0.88032 <-- By Pass Factor

(Calculation completed in 00.004 seconds)

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Home » Physics » Refrigeration and Air Conditioning » Psychrometry » Mechanical » By Pass Factor » By-Pass Factor of Heating Coil

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Shri Govindram Seksaria Institute of Technology and Science (SGSITS), Indore

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< By Pass Factor Calculators

By-Pass Factor of Heating Coil

Go By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity))

By-Pass Factor of Cooling Coil

Go By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity))

Overall Heat Transfer Coefficient given By-Pass Factor

Go Overall Heat Transfer Coefficient = -(ln(By Pass Factor)*Mass of Air*Specific Heat Capacity)/Surface Area of Coil

Surface Area of Coil given By-Pass Factor

Go Surface Area of Coil = -(ln(By Pass Factor)*Mass of Air*Specific Heat Capacity)/Overall Heat Transfer Coefficient

By-Pass Factor of Heating Coil Formula

By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity))
BPF = exp(-(U*A_c)/(m_air*c))

What is By-pass factor?

The inability of a coil to cool or heat the air to its temperature is indicated by a factor called the by-pass factor (BPF) or Coil Bypass Factor. This inability is due to the coil inefficiency and some amount of air just bypassing the coil without getting affected by it. A coil with low BPF has better performance. BPF can also be defined as the ratio of air that is unaffected by the coil to the total quantity of air passing over the coil.

How to Calculate By-Pass Factor of Heating Coil?

By-Pass Factor of Heating Coil calculator uses By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity)) to calculate the By Pass Factor, By-Pass Factor of Heating Coil formula is defined as a dimensionless quantity that represents the ratio of the heat transferred from the heating coil to the air stream to the maximum possible heat transfer, indicating the coil's heat transfer effectiveness in an air heating system. By Pass Factor is denoted by BPF symbol.

How to calculate By-Pass Factor of Heating Coil using this online calculator? To use this online calculator for By-Pass Factor of Heating Coil, enter Overall Heat Transfer Coefficient (U), Surface Area of Coil (A_c), Mass of Air (m_air) & Specific Heat Capacity (c) and hit the calculate button. Here is how the By-Pass Factor of Heating Coil calculation can be explained with given input values -> 0.88032 = exp(-(50*64)/(6*4184)).

FAQ

What is By-Pass Factor of Heating Coil?

By-Pass Factor of Heating Coil formula is defined as a dimensionless quantity that represents the ratio of the heat transferred from the heating coil to the air stream to the maximum possible heat transfer, indicating the coil's heat transfer effectiveness in an air heating system and is represented as BPF = exp(-(U*A_c)/(m_air*c)) or By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity)). Overall heat transfer coefficient is the overall convective heat transfer between a fluid medium (a fluid) and the surface (wall) flowed over by the fluid, The Surface Area of Coil is the total area of the coil through which any fluid passes, Mass of Air is both a property of air and a measure of its resistance to acceleration when a net force is applied & Specific Heat Capacity is the heat required to raise the temperature of the unit mass of a given substance by a given amount.

How to calculate By-Pass Factor of Heating Coil?

By-Pass Factor of Heating Coil formula is defined as a dimensionless quantity that represents the ratio of the heat transferred from the heating coil to the air stream to the maximum possible heat transfer, indicating the coil's heat transfer effectiveness in an air heating system is calculated using By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity)). To calculate By-Pass Factor of Heating Coil, you need Overall Heat Transfer Coefficient (U), Surface Area of Coil (A_c), Mass of Air (m_air) & Specific Heat Capacity (c). With our tool, you need to enter the respective value for Overall Heat Transfer Coefficient, Surface Area of Coil, Mass of Air & Specific Heat Capacity and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate By Pass Factor?

In this formula, By Pass Factor uses Overall Heat Transfer Coefficient, Surface Area of Coil, Mass of Air & Specific Heat Capacity. We can use 1 other way(s) to calculate the same, which is/are as follows -

By Pass Factor = exp(-(Overall Heat Transfer Coefficient*Surface Area of Coil)/(Mass of Air*Specific Heat Capacity))

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