Log Mean Temperature Difference Calculation

Mechanical Engineering

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With this calculator, you w/ill be able to quickly and easily determine the velocity of the air in a ducted system, allowing you to make informed decisions when designing and installing an HVAC system.

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Air duct velocity is the speed at which air moves through an air duct. It is usually measured in feet per minute (fpm) or meters per second (m/s). The following equation calculates the velocity of air in a duct based on the volumetric flow rate and the cross-sectional area of the duct. 

If you're looking for more HVAC calculations, why not take a look at some of our other HVAC calculators?

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Air Duct Velocity Calculator 

🏁 Free-To-Use Air Duct Velocity Calculator: Easily Calculate Air Duct Velocity with CalcTree. Get Accurate Results in No Time! Start using now!

The Mach number can be used to determine if a flow is compressible or incompressible. This page allows you to calculate Mach number for any fluid, just adjust the speed of sound in the fluid to match your requirements!

The Mach number represents the ratio between velocity and the speed of sound in the surrounding fluid. Mach number can determine whether a flow is compressible or incompressible.

Check out some of our fluid mechanics or other related calculators!

Mach Number Calculator

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Welcome to our page about buoyancy force! Buoyancy force is the upward force that a fluid exerts on a submerged object, countering the object's weight. Here you will find an overview of the concept of buoyancy and a calculator to help you determine the buoyancy force on an object in a fluid.

, pressure increases with depth. If we considers a column of fluid, the pressure at the bottom is greater than the pressure at the top.

We calculate the buoyancy force using the following equation:

Bouyancy Force Calculator 

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Welcome to our page about Reynolds number! The Reynolds number is a dimensionless quantity used for the categorisation of fluid flows as either turbulent or laminar. It is calculated as the ratio of inertial forces to viscous forces, with higher Reynolds numbers indicating turbulent flow.

Here we'll provide some more information and a calculation to categorise your flows!

Reynolds number can be defined as the ratio of internal forces to the viscous forces within a fluid experiencing relative internal movement due to different fluid velocities. 

For most practical purposes concerning pipes, if the Reynolds number is below 2300 the flow is considered to be 

. If the Reynolds number is between 2300 and 4000 the flow is considered 

These critical values do vary depending on various factors related to different situations, so it is important to ensure that the correct critical value is being used.

The Reynolds number of fluid is calculated using the following equation;

For another similar calculator, check out our 

Reynolds Number Calculator 

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Heat transfer rate refers to the rate at which heat energy is transferred from one body to another. The rate of heat transfer is determined by several factors, including the specific heat capacity of the materials involved and temperature difference. This calculator calculates the heat transfer rate of a fluid in motion.

The heat transfer rate in a fluid in motion is calculated using mass flow rate, specific heat capacity and temperature difference. The specific heat capacity of a substance is a measure of the amount of heat required to raise the temperature of a given amount of the substance by one degree Celsius.

Heat Transfer Calculator 

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Log mean temperature difference (LMTD) in the logarithmic average between the hot and cold flows at each end of a heat exchanger. The LMTD is used in heat exchangers to determine the temperature driving force of heat transfer. This calculator is used specifically for heat exchangers operating in parallel flow.

In parallel flow heat exchangers the hot and cold fluids enter at the same end, and flow in the same direction to leave together at the other end of the exchanger. 

Check out our log mean temperature difference for counterflow heat exchangers 

🏁 Calculate the LMTD of your heat exchanger with CalcTree's Free-To-Use Log Mean Temperature Difference Calculator. No fees, no sign-up required!

Volumetric efficiency is a measure of how effectively an internal combustion engine can draw in and utilize air during the intake stroke. It is an important factor in engine performance and can be affected by a number of factors such as engine design, atmospheric conditions, and operating conditions. This volumetric efficiency calculator can help you determine the efficiency of an engine and identify areas for improvement!

And the density of air can be calculated using:

Calculate Volumetric Efficiency

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Welcome! This page helps you calculate the static pressure in a fluid at any given depth. Knowing the static pressure can help you better understand the properties of the fluid and the environment it's in. Let's get started!

To calculate the dynamic pressure in a fluid, check out our dynamic pressure calculator!

Static Pressure Calculator 

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This duct system pressure drop calculator is a tool to assist in estimating the pressure drop in an HVAC ducts.

Duct system pressure drop is calculated using the velocity pressure of the duct and the loss coefficient for the particular duct components. The ducts velocity pressure is calculated using the density of air flowing through the duct and the velocity of this air stream.

To calculate the velocity pressure we use the following equation:

For some more HVAC calculations, why not take a look at some of our other HVAC calculators?

Duct System Pressure Drops Calculator

🏁Calculate pressure drops in duct systems with CalcTree's Free-To-Use online calculator. Simplify HVAC calculations. Try our free calculators now!

When we have a dynamic fluid system, we have both static pressure, and dynamic pressure which is related to the local velocity of the flow. This equation calculates dynamic pressure in fluid flow.

Dynamic pressure is the kinetic energy per unit volume of a fluid in motion, and can be expressed in the following formula:

To find the static pressure in a fluid and other fluid dynamics calculators, have a look at:

Dynamic Pressure Calculator 

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This rate of ventilation calculator is designed to help you calculate the required rate of ventilation in a room based on the number of occupants.

Rate of ventilation in a room refers to the amount of air that is exchanged in the space between the outside environment and the interior of the room over a given period of time. This calculator uses the number of occupants and the required ventilation rate per person to calculate the required rate of ventilation.

Make sure to check recommendations and standards for ventilation rate per person depending on your particular situation.

Room ventilation calculator | Occupancy Method

🏁 Calculate room ventilation requirements with our Free-To-Use Occupancy Method Room Ventilation Calculator. Accurate and easy to use. Try now!

This rate of ventilation calculator is designed to help you calculate the required rate of ventilation in a room based on the size of the room.

Rate of ventilation in a room refers to the amount of air that is exchanged in the space between the outside environment and the interior of the room over a given period of time. This calculator uses the area of the room and the required ventilation rate per square metre to calculate the required rate of ventilation.

💡 Make sure to check recommendations and standards for ventilation rate per square meter depending on your particular situation.

Room ventilation calculator | Area Method

🏁 Use CalcTree Free-To-Use Room Ventilation Calculator to estimate the ventilation requirement in your room. Area Method. Calculate now

In parallel flow heat exchangers the hot and cold fluids enter at the same end, and flow in the same direction to leave together at the other end of the exchanger. This means that the greatest temperature difference occurs as the fluids enter. This difference decreases along the length of the exchanger as heat is transferred between the fluids. Log mean temperature difference is is used to describe this difference using the following the equation.

Log mean temperature difference (LMTD) in the logarithmic average between the hot and cold flows at each end of a heat exchanger. The LMTD is used in heat exchangers to determine the temperature driving force of heat transfer.

Check out our log mean temperature difference for parallel flow heat exchangers 

Log Mean Temperature Difference in Counter Flow Heat Exchangers

🏁 Easily calculate the Log Mean Temperature Difference in Counter-Flow Heat Exchangers with our Free-To-Use Calculator. Eeasy to use. Try it now!