## Overall heat transfer coefficient given by-pass factor Solution

STEP 0: Pre-Calculation Summary
Formula Used
Overall heat transfer coefficient = -((ln(By pass factor)*Mass of air*Specific Heat Capacity)/Surface Area of Coil)
U = -((ln(BPF)*mair*c)/Ac)
This formula uses 1 Functions, 5 Variables
Functions Used
ln - Natural logarithm function (base e), ln(Number)
Variables Used
Overall heat transfer coefficient - (Measured in Watt per Meter² per K) - 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.
By pass factor - By pass factor is the inability of a coil to cool or heat the air to its temperature.
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.
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.
STEP 1: Convert Input(s) to Base Unit
By pass factor: 0.8 --> 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)
Surface Area of Coil: 80 Square Meter --> 80 Square Meter No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
U = -((ln(BPF)*mair*c)/Ac) --> -((ln(0.8)*6*4184)/80)
Evaluating ... ...
U = 70.022446402399
STEP 3: Convert Result to Output's Unit
70.022446402399 Watt per Meter² per K --> No Conversion Required
70.022446402399 Watt per Meter² per K <-- Overall heat transfer coefficient
(Calculation completed in 00.016 seconds)
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Created by Ravi Khiyani
Shri Govindram Seksaria Institute of Technology and Science (SGSITS), Indore
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## < 7 By-pass Factor of Heating and Cooling coil Calculators

Sensible heat given out by coil using by-pass factor
Sensible Heat = (Overall heat transfer coefficient*Surface Area of Coil*(Final Temperature-Initial Temperature))/ln(1/By pass factor) Go
By-pass Factor of heating coil
By pass factor = exp(-((Overall heat transfer coefficient*Surface Area of Coil)/(Mass of air*Specific Heat Capacity))) Go
By-pass Factor of cooling coil
By pass factor = exp(-((Overall heat transfer coefficient*Surface Area of Coil)/(Mass of air*Specific Heat Capacity))) Go
Mass of air passing over the coil given by-pass factor
Mass of air = -((Overall heat transfer coefficient*Surface Area of Coil)/(Specific Heat Capacity*ln(By pass factor))) Go
Overall heat transfer coefficient given by-pass factor
Overall heat transfer coefficient = -((ln(By pass factor)*Mass of air*Specific Heat Capacity)/Surface Area of Coil) Go
Surface area of coil given by-pass factor
Surface Area of Coil = -((ln(By pass factor)*Mass of air*Specific Heat Capacity)/Overall heat transfer coefficient) Go
LMTD of coil given by-pass factor
Logarithmic mean temperature difference = (Final Temperature-Initial Temperature)/ln(1/By pass factor) Go

## Overall heat transfer coefficient given by-pass factor Formula

Overall heat transfer coefficient = -((ln(By pass factor)*Mass of air*Specific Heat Capacity)/Surface Area of Coil)
U = -((ln(BPF)*mair*c)/Ac)

## 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 Overall heat transfer coefficient given by-pass factor?

Overall heat transfer coefficient given by-pass factor calculator uses Overall heat transfer coefficient = -((ln(By pass factor)*Mass of air*Specific Heat Capacity)/Surface Area of Coil) to calculate the Overall heat transfer coefficient, The Overall heat transfer coefficient given by-pass factor formula calculates the heat transfer coefficient of the coil material by using the by-pass factor. Overall heat transfer coefficient is denoted by U symbol.

How to calculate Overall heat transfer coefficient given by-pass factor using this online calculator? To use this online calculator for Overall heat transfer coefficient given by-pass factor, enter By pass factor (BPF), Mass of air (mair), Specific Heat Capacity (c) & Surface Area of Coil (Ac) and hit the calculate button. Here is how the Overall heat transfer coefficient given by-pass factor calculation can be explained with given input values -> 70.02245 = -((ln(0.8)*6*4184)/80).

### FAQ

What is Overall heat transfer coefficient given by-pass factor?
The Overall heat transfer coefficient given by-pass factor formula calculates the heat transfer coefficient of the coil material by using the by-pass factor and is represented as U = -((ln(BPF)*mair*c)/Ac) or Overall heat transfer coefficient = -((ln(By pass factor)*Mass of air*Specific Heat Capacity)/Surface Area of Coil). By pass factor is the inability of a coil to cool or heat the air to its temperature, 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 & The Surface Area of Coil is the total area of the coil through which any fluid passes.
How to calculate Overall heat transfer coefficient given by-pass factor?
The Overall heat transfer coefficient given by-pass factor formula calculates the heat transfer coefficient of the coil material by using the by-pass factor is calculated using Overall heat transfer coefficient = -((ln(By pass factor)*Mass of air*Specific Heat Capacity)/Surface Area of Coil). To calculate Overall heat transfer coefficient given by-pass factor, you need By pass factor (BPF), Mass of air (mair), Specific Heat Capacity (c) & Surface Area of Coil (Ac). With our tool, you need to enter the respective value for By pass factor, Mass of air, Specific Heat Capacity & Surface Area of Coil 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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