Overall Heat Transfer Coefficient for Unfinned Tube Calculator

✖External Convection Heat Transfer Coefficient is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat in case of convective heat transfer.ⓘ External Convection Heat Transfer Coefficient [h_outside]			+10% -10%
✖Fouling Factor on Outside of Tube represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the Outside of tube surfaces of the heat exchanger.ⓘ Fouling Factor on Outside of Tube [R_o]			+10% -10%
✖Outside Tube Diameter is defined as the Outer diameter of the tube present in heat exchanger.ⓘ Outside Tube Diameter [d_o]			+10% -10%
✖Inside Tube Diameter is defined as the Outer diameter of the tube present in heat exchanger.ⓘ Inside Tube Diameter [d_i]			+10% -10%
✖Thermal Conductivity is rate of heat passes through specified material, expressed as amount of heat flows per unit time through a unit area with a temperature gradient of one degree per unit distance.ⓘ Thermal Conductivity [k]			+10% -10%
✖Fouling Factor on Inside of Tube represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the Inside of tube surfaces of the heat exchanger.ⓘ Fouling Factor on Inside of Tube [R_i]			+10% -10%
✖Outside Tube Surface Area is the outer surface area of the tube.ⓘ Outside Tube Surface Area [A_o]			+10% -10%
✖Inside Tube Surface Area is the inside surface area of the tube.ⓘ Inside Tube Surface Area [A_i]			+10% -10%
✖Inside Convection Heat Transfer Coefficient is the coefficient of convection heat transfer at the inside surface of the body or object or wall, etc.ⓘ Inside Convection Heat Transfer Coefficient [h_inside]			+10% -10%

✖Overall Heat Transfer Coefficient after Fouling is defined as the overall HT Coefficient of uncleaned heat exchanger after fouling has occured in it.ⓘ Overall Heat Transfer Coefficient for Unfinned Tube [U_d]

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Overall Heat Transfer Coefficient for Unfinned Tube

Formula

`"U"_{"d"} = 1/((1/"h"_{"outside"})+"R"_{"o"}+((("d"_{"o"}*(ln("d"_{"o"}/"d"_{"i"}))))/(2*"k"))+(("R"_{"i"}*"A"_{"o"})/"A"_{"i"})+("A"_{"o"}/("h"_{"inside"}*"A"_{"i"})))`

Example

`"0.975937W/m²*K"=1/((1/"17W/m²*K")+"0.001m²K/W"+((("2.68m"*(ln("2.68m"/"1.27m"))))/(2*"10.18W/(m*K)"))+(("0.002m²K/W"*"14m²")/"12m²")+("14m²"/("1.35W/m²*K"*"12m²")))`

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Overall Heat Transfer Coefficient for Unfinned Tube Solution

STEP 0: Pre-Calculation Summary

Formula Used

Overall Heat Transfer Coefficient after Fouling = 1/((1/External Convection Heat Transfer Coefficient)+Fouling Factor on Outside of Tube+(((Outside Tube Diameter*(ln(Outside Tube Diameter/Inside Tube Diameter))))/(2*Thermal Conductivity))+((Fouling Factor on Inside of Tube*Outside Tube Surface Area)/Inside Tube Surface Area)+(Outside Tube Surface Area/(Inside Convection Heat Transfer Coefficient*Inside Tube Surface Area)))
U_d = 1/((1/h_outside)+R_o+(((d_o*(ln(d_o/d_i))))/(2*k))+((R_i*A_o)/A_i)+(A_o/(h_inside*A_i)))
This formula uses 1 Functions, 10 Variables

Functions Used

ln - The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function., ln(Number)

Variables Used

Overall Heat Transfer Coefficient after Fouling - (Measured in Watt per Square Meter per Kelvin) - Overall Heat Transfer Coefficient after Fouling is defined as the overall HT Coefficient of uncleaned heat exchanger after fouling has occured in it.
External Convection Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - External Convection Heat Transfer Coefficient is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat in case of convective heat transfer.
Fouling Factor on Outside of Tube - (Measured in Square Meter Kelvin per Watt) - Fouling Factor on Outside of Tube represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the Outside of tube surfaces of the heat exchanger.
Outside Tube Diameter - (Measured in Meter) - Outside Tube Diameter is defined as the Outer diameter of the tube present in heat exchanger.
Inside Tube Diameter - (Measured in Meter) - Inside Tube Diameter is defined as the Outer diameter of the tube present in heat exchanger.
Thermal Conductivity - (Measured in Watt per Meter per K) - Thermal Conductivity is rate of heat passes through specified material, expressed as amount of heat flows per unit time through a unit area with a temperature gradient of one degree per unit distance.
Fouling Factor on Inside of Tube - (Measured in Square Meter Kelvin per Watt) - Fouling Factor on Inside of Tube represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the Inside of tube surfaces of the heat exchanger.
Outside Tube Surface Area - (Measured in Square Meter) - Outside Tube Surface Area is the outer surface area of the tube.
Inside Tube Surface Area - (Measured in Square Meter) - Inside Tube Surface Area is the inside surface area of the tube.
Inside Convection Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - Inside Convection Heat Transfer Coefficient is the coefficient of convection heat transfer at the inside surface of the body or object or wall, etc.

STEP 1: Convert Input(s) to Base Unit

External Convection Heat Transfer Coefficient: 17 Watt per Square Meter per Kelvin --> 17 Watt per Square Meter per Kelvin No Conversion Required
Fouling Factor on Outside of Tube: 0.001 Square Meter Kelvin per Watt --> 0.001 Square Meter Kelvin per Watt No Conversion Required
Outside Tube Diameter: 2.68 Meter --> 2.68 Meter No Conversion Required
Inside Tube Diameter: 1.27 Meter --> 1.27 Meter No Conversion Required
Thermal Conductivity: 10.18 Watt per Meter per K --> 10.18 Watt per Meter per K No Conversion Required
Fouling Factor on Inside of Tube: 0.002 Square Meter Kelvin per Watt --> 0.002 Square Meter Kelvin per Watt No Conversion Required
Outside Tube Surface Area: 14 Square Meter --> 14 Square Meter No Conversion Required
Inside Tube Surface Area: 12 Square Meter --> 12 Square Meter No Conversion Required
Inside Convection Heat Transfer Coefficient: 1.35 Watt per Square Meter per Kelvin --> 1.35 Watt per Square Meter per Kelvin No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

U_d = 1/((1/h_outside)+R_o+(((d_o*(ln(d_o/d_i))))/(2*k))+((R_i*A_o)/A_i)+(A_o/(h_inside*A_i))) --> 1/((1/17)+0.001+(((2.68*(ln(2.68/1.27))))/(2*10.18))+((0.002*14)/12)+(14/(1.35*12)))

Evaluating ... ...

U_d = 0.975937149366369

STEP 3: Convert Result to Output's Unit

0.975937149366369 Watt per Square Meter per Kelvin --> No Conversion Required

FINAL ANSWER

0.975937149366369 ≈ 0.975937 Watt per Square Meter per Kelvin <-- Overall Heat Transfer Coefficient after Fouling

(Calculation completed in 00.004 seconds)

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< 10+ Heat Exchanger Calculators

Overall Heat Transfer Coefficient for Unfinned Tube

Go Overall Heat Transfer Coefficient after Fouling = 1/((1/External Convection Heat Transfer Coefficient)+Fouling Factor on Outside of Tube+(((Outside Tube Diameter*(ln(Outside Tube Diameter/Inside Tube Diameter))))/(2*Thermal Conductivity))+((Fouling Factor on Inside of Tube*Outside Tube Surface Area)/Inside Tube Surface Area)+(Outside Tube Surface Area/(Inside Convection Heat Transfer Coefficient*Inside Tube Surface Area)))

Total Heat Transfer Coefficient for Long Cylinder

Go Heat Transfer Coefficient = ((0.023*(Mass Velocity^0.8)*(Thermal Conductivity^0.67)*(Specific Heat Capacity^0.33))/((Diameter of Tube^0.2)*(Viscosity of Fluid^0.47)))

Heat Transfer in Heat Exchanger given Cold Fluid Properties

Go Heat = modulus(Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid))

Heat Transfer in Heat Exchanger given Hot Fluid Properties

Go Heat = Mass of Hot Fluid*Specific Heat Capacity of Hot Fluid*(Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)

Rate of Heat Transfer using Correction Factor and LMTD

Go Heat Transfer = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Correction Factor*Log Mean Temperature Difference

Maximum Possible Rate of Heat Transfer

Go Maximum Possible Rate of Heat Transfer = Minimum Capacity Rate*(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)

Number of Heat Transfer Units

Go Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate

Heat Transfer in Heat Exchanger given Overall Heat Transfer Coefficient

Go Heat = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Log Mean Temperature Difference

Fouling Factor

Go Fouling Factor = (1/Overall Heat Transfer Coefficient after Fouling)-(1/Overall Heat Transfer Coefficient)

Capacity Rate

Go Capacity Rate = Mass Flow Rate*Specific Heat Capacity

< 15 Heat Exchanger and its Effectiveness Calculators

Overall Heat Transfer Coefficient for Unfinned Tube

Effectiveness of Counter-Current Heat Exchanger if Cold Fluid is Minimum Fluid

Go Effectiveness of HE when Cold Fluid is Min Fluid = (modulus((Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid))/(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid))

Effectiveness of Parallel-Flow Heat Exchanger if Cold Fluid is Minimum Fluid

Go Effectiveness of HE when Cold Fluid is Min Fluid = (Outlet Temperature of Cold Fluid-Inlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)

Effectiveness of Parallel-Flow Heat Exchanger if Hot Fluid is Minimum Fluid

Go Effectiveness of HE when Hot Fluid is Min Fluid = ((Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)/(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid))

Effectiveness of Counter-Current Heat Exchanger if Hot Fluid is Minimum Fluid

Go Effectiveness of HE when Hot Fluid is Min Fluid = (Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)/(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)

Heat Transfer in Heat Exchanger given Cold Fluid Properties

Go Heat = modulus(Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid))

Heat Transfer in Heat Exchanger given Hot Fluid Properties

Go Heat = Mass of Hot Fluid*Specific Heat Capacity of Hot Fluid*(Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)

Rate of Heat Transfer using Correction Factor and LMTD

Go Heat Transfer = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Correction Factor*Log Mean Temperature Difference

Maximum Possible Rate of Heat Transfer

Go Maximum Possible Rate of Heat Transfer = Minimum Capacity Rate*(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)

Number of Heat Transfer Units

Go Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate

Heat Transfer in Heat Exchanger given Overall Heat Transfer Coefficient

Go Heat = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Log Mean Temperature Difference

Heat Exchanger Effectiveness for Minimum Fluid

Go Effectiveness of Heat Exchanger = Temperature Difference of Minimum Fluid/Maximum Temperature Difference in Heat Exchanger

Fouling Factor

Go Fouling Factor = (1/Overall Heat Transfer Coefficient after Fouling)-(1/Overall Heat Transfer Coefficient)

Heat Exchanger Effectiveness

Go Effectiveness of Heat Exchanger = Actual Rate of Heat Transfer/Maximum Possible Rate of Heat Transfer

Capacity Rate

Go Capacity Rate = Mass Flow Rate*Specific Heat Capacity

Overall Heat Transfer Coefficient for Unfinned Tube Formula

What is Heat Exchanger?

A Heat Exchanger is a device that facilitates the process of heat exchange between two fluids that are at different temperatures.

What are the Different Types of Heat Exchanger?

Mainly Heat Exchanger are divided in 4 categories: Hairpin Type Heat Exchanger, Double Pipe Heat Exchanger, Shell and Tube Heat Exchanger & Plate Type Heat Exchanger.

How to Calculate Overall Heat Transfer Coefficient for Unfinned Tube?

Overall Heat Transfer Coefficient for Unfinned Tube calculator uses Overall Heat Transfer Coefficient after Fouling = 1/((1/External Convection Heat Transfer Coefficient)+Fouling Factor on Outside of Tube+(((Outside Tube Diameter*(ln(Outside Tube Diameter/Inside Tube Diameter))))/(2*Thermal Conductivity))+((Fouling Factor on Inside of Tube*Outside Tube Surface Area)/Inside Tube Surface Area)+(Outside Tube Surface Area/(Inside Convection Heat Transfer Coefficient*Inside Tube Surface Area))) to calculate the Overall Heat Transfer Coefficient after Fouling, The Overall Heat Transfer Coefficient for Unfinned Tube formula is defined as the function of Outside Tube Surface Area, Inside Tube Surface Area, Thermal Resistance for Conduction Offered By Tube, Inside Convection Heat Transfer Coefficient, External Convection Heat Transfer Coefficient. Overall Heat Transfer Coefficient after Fouling is denoted by U_d symbol.

How to calculate Overall Heat Transfer Coefficient for Unfinned Tube using this online calculator? To use this online calculator for Overall Heat Transfer Coefficient for Unfinned Tube, enter External Convection Heat Transfer Coefficient (h_outside), Fouling Factor on Outside of Tube (R_o), Outside Tube Diameter (d_o), Inside Tube Diameter (d_i), Thermal Conductivity (k), Fouling Factor on Inside of Tube (R_i), Outside Tube Surface Area (A_o), Inside Tube Surface Area (A_i) & Inside Convection Heat Transfer Coefficient (h_inside) and hit the calculate button. Here is how the Overall Heat Transfer Coefficient for Unfinned Tube calculation can be explained with given input values -> 0.718493 = 1/((1/17)+0.001+(((2.68*(ln(2.68/1.27))))/(2*10.18))+((0.002*14)/12)+(14/(1.35*12))).

FAQ

What is Overall Heat Transfer Coefficient for Unfinned Tube?

The Overall Heat Transfer Coefficient for Unfinned Tube formula is defined as the function of Outside Tube Surface Area, Inside Tube Surface Area, Thermal Resistance for Conduction Offered By Tube, Inside Convection Heat Transfer Coefficient, External Convection Heat Transfer Coefficient and is represented as U_d = 1/((1/h_outside)+R_o+(((d_o*(ln(d_o/d_i))))/(2*k))+((R_i*A_o)/A_i)+(A_o/(h_inside*A_i))) or Overall Heat Transfer Coefficient after Fouling = 1/((1/External Convection Heat Transfer Coefficient)+Fouling Factor on Outside of Tube+(((Outside Tube Diameter*(ln(Outside Tube Diameter/Inside Tube Diameter))))/(2*Thermal Conductivity))+((Fouling Factor on Inside of Tube*Outside Tube Surface Area)/Inside Tube Surface Area)+(Outside Tube Surface Area/(Inside Convection Heat Transfer Coefficient*Inside Tube Surface Area))). External Convection Heat Transfer Coefficient is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat in case of convective heat transfer, Fouling Factor on Outside of Tube represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the Outside of tube surfaces of the heat exchanger, Outside Tube Diameter is defined as the Outer diameter of the tube present in heat exchanger, Inside Tube Diameter is defined as the Outer diameter of the tube present in heat exchanger, Thermal Conductivity is rate of heat passes through specified material, expressed as amount of heat flows per unit time through a unit area with a temperature gradient of one degree per unit distance, Fouling Factor on Inside of Tube represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the Inside of tube surfaces of the heat exchanger, Outside Tube Surface Area is the outer surface area of the tube, Inside Tube Surface Area is the inside surface area of the tube & Inside Convection Heat Transfer Coefficient is the coefficient of convection heat transfer at the inside surface of the body or object or wall, etc.

How to calculate Overall Heat Transfer Coefficient for Unfinned Tube?

The Overall Heat Transfer Coefficient for Unfinned Tube formula is defined as the function of Outside Tube Surface Area, Inside Tube Surface Area, Thermal Resistance for Conduction Offered By Tube, Inside Convection Heat Transfer Coefficient, External Convection Heat Transfer Coefficient is calculated using Overall Heat Transfer Coefficient after Fouling = 1/((1/External Convection Heat Transfer Coefficient)+Fouling Factor on Outside of Tube+(((Outside Tube Diameter*(ln(Outside Tube Diameter/Inside Tube Diameter))))/(2*Thermal Conductivity))+((Fouling Factor on Inside of Tube*Outside Tube Surface Area)/Inside Tube Surface Area)+(Outside Tube Surface Area/(Inside Convection Heat Transfer Coefficient*Inside Tube Surface Area))). To calculate Overall Heat Transfer Coefficient for Unfinned Tube, you need External Convection Heat Transfer Coefficient (h_outside), Fouling Factor on Outside of Tube (R_o), Outside Tube Diameter (d_o), Inside Tube Diameter (d_i), Thermal Conductivity (k), Fouling Factor on Inside of Tube (R_i), Outside Tube Surface Area (A_o), Inside Tube Surface Area (A_i) & Inside Convection Heat Transfer Coefficient (h_inside). With our tool, you need to enter the respective value for External Convection Heat Transfer Coefficient, Fouling Factor on Outside of Tube, Outside Tube Diameter, Inside Tube Diameter, Thermal Conductivity, Fouling Factor on Inside of Tube, Outside Tube Surface Area, Inside Tube Surface Area & Inside Convection Heat Transfer Coefficient 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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