Logarithmic mean of temperature difference Calculator

✖Heat Flow Rate is the amount of heat that is transferred per unit of time in some material, usually measured in watt. Heat is the flow of thermal energy driven by thermal non-equilibrium.ⓘ Heat Flow Rate [Q]			+10% -10%
✖The area is the amount of two-dimensional space taken up by an object.ⓘ Area [A]			+10% -10%
✖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_overall]			+10% -10%

✖Logarithmic Mean Temperature Difference is the log of the mean of the temperature values.ⓘ Logarithmic mean of temperature difference [ΔT_m]

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Logarithmic mean of temperature difference Solution

STEP 0: Pre-Calculation Summary

Formula Used

Logarithmic Mean Temperature Difference = Heat Flow Rate/(Area*Overall Heat Transfer Coefficient)
ΔT_m = Q/(A*U_overall)
This formula uses 4 Variables

Variables Used

Logarithmic Mean Temperature Difference - Logarithmic Mean Temperature Difference is the log of the mean of the temperature values.
Heat Flow Rate - (Measured in Watt) - Heat Flow Rate is the amount of heat that is transferred per unit of time in some material, usually measured in watt. Heat is the flow of thermal energy driven by thermal non-equilibrium.
Area - (Measured in Square Meter) - The area is the amount of two-dimensional space taken up by an object.
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.

STEP 1: Convert Input(s) to Base Unit

Heat Flow Rate: 125 Watt --> 125 Watt No Conversion Required
Area: 50 Square Meter --> 50 Square Meter No Conversion Required
Overall Heat Transfer Coefficient: 0.25 Watt per Square Meter per Kelvin --> 0.25 Watt per Square Meter per Kelvin No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ΔT_m = Q/(A*U_overall) --> 125/(50*0.25)

Evaluating ... ...

ΔT_m = 10

STEP 3: Convert Result to Output's Unit

10 --> No Conversion Required

FINAL ANSWER

10 <-- Logarithmic Mean Temperature Difference

(Calculation completed in 00.004 seconds)

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Home » Physics » Heat and Mass Transfer » Heat Exchanger » Transverse Fin Heat Exchanger » Mechanical » Heat Transfer Through Fin » Logarithmic mean of temperature difference

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Created by Nishan Poojary

Shri Madhwa Vadiraja Institute of Technology and Management (SMVITM), Udupi

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< Heat Transfer Through Fin Calculators

Overall heat transfer coefficient

LaTeX Go Overall Heat Transfer Coefficient = Heat Flow Rate/(Area*Logarithmic Mean Temperature Difference)

Heat flow required

LaTeX Go Heat Flow Rate = Area*Overall Heat Transfer Coefficient*Logarithmic Mean Temperature Difference

Mass flux of fluid in transverse fin heat exchanger

LaTeX Go Mass Flux = (Reynolds Number(e)*Viscosity of Fluid)/Equivalent Diameter

Reynolds number in heat exchanger

LaTeX Go Reynolds Number = (Mass Flux*Equivalent Diameter)/(Viscosity of Fluid)

Logarithmic mean of temperature difference Formula

LaTeX Go

Logarithmic Mean Temperature Difference = Heat Flow Rate/(Area*Overall Heat Transfer Coefficient)
ΔT_m = Q/(A*U_overall)

What is Heat exchanger?

A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural-gas processing, and sewage treatment. The classic example of a heat exchanger is found in an internal combustion engine in which a circulating fluid known as engine coolant flows through radiator coils and air flows past the coils, which cools the coolant and heats the incoming air. Another example is the heat sink, which is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant.

How to Calculate Logarithmic mean of temperature difference?

Logarithmic mean of temperature difference calculator uses Logarithmic Mean Temperature Difference = Heat Flow Rate/(Area*Overall Heat Transfer Coefficient) to calculate the Logarithmic Mean Temperature Difference, The Logarithmic mean of temperature difference formula is defined as is a logarithmic average of the temperature difference between the hot and cold fluid at each end of the exchanger. Logarithmic Mean Temperature Difference is denoted by ΔT_m symbol.

How to calculate Logarithmic mean of temperature difference using this online calculator? To use this online calculator for Logarithmic mean of temperature difference, enter Heat Flow Rate (Q), Area (A) & Overall Heat Transfer Coefficient (U_overall) and hit the calculate button. Here is how the Logarithmic mean of temperature difference calculation can be explained with given input values -> 10 = 125/(50*0.25).

FAQ

What is Logarithmic mean of temperature difference?

The Logarithmic mean of temperature difference formula is defined as is a logarithmic average of the temperature difference between the hot and cold fluid at each end of the exchanger and is represented as ΔT_m = Q/(A*U_overall) or Logarithmic Mean Temperature Difference = Heat Flow Rate/(Area*Overall Heat Transfer Coefficient). Heat Flow Rate is the amount of heat that is transferred per unit of time in some material, usually measured in watt. Heat is the flow of thermal energy driven by thermal non-equilibrium, The area is the amount of two-dimensional space taken up by an object & 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.

How to calculate Logarithmic mean of temperature difference?

The Logarithmic mean of temperature difference formula is defined as is a logarithmic average of the temperature difference between the hot and cold fluid at each end of the exchanger is calculated using Logarithmic Mean Temperature Difference = Heat Flow Rate/(Area*Overall Heat Transfer Coefficient). To calculate Logarithmic mean of temperature difference, you need Heat Flow Rate (Q), Area (A) & Overall Heat Transfer Coefficient (U_overall). With our tool, you need to enter the respective value for Heat Flow Rate, Area & Overall 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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