Heat Exchanger LMTD Calculator

⚙

basic

Calculate log mean temperature difference.

Formula

LMTD = (dT1 - dT2) / ln(dT1/dT2)

Compare two scenarios side-by-side

Hot Fluid Inlet

°C

Hot Fluid Outlet

°C

Cold Fluid Inlet

°C

Cold Fluid Outlet

°C

dT1

—

dT2

—

LMTD

—

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About This Calculator & Guide

About the Heat Exchanger LMTD Calculator

The Heat Exchanger LMTD Calculator is a dedicated tool in our Engineering category designed to help you calculate log mean temperature difference in seconds. By automating the underlying mathematics, this utility eliminates manual calculations and provides reliable, instantaneous estimations.

Mathematical Principles & Calculation Steps

To compute the results, the calculation engine processes your custom inputs: Hot Fluid Inlet (°C), Hot Fluid Outlet (°C), Cold Fluid Inlet (°C), Cold Fluid Outlet (°C). Specifically, the calculations are evaluated using the standard relationship: LMTD = (dT1 - dT2) / ln(dT1/dT2). All computations are performed locally within your secure browser session, ensuring absolute data privacy and instantaneous updates without any network delay.

Worked Step-by-Step Calculation Example

Worked Example Sandbox

For illustrative purposes, consider the following calculation using our default values. When we initialize the input fields with Hot Fluid Inlet = 90 °C, Hot Fluid Outlet = 50 °C, Cold Fluid Inlet = 20 °C, Cold Fluid Outlet = 40 °C, the client-side calculator processes the numbers to resolve the formula and produce the final outputs: dT1 = 50 °C and dT2 = 30 °C and LMTD = 39.152 °C.

How to Use This Calculator

Set Inputs: Adjust the input values: Hot Fluid Inlet, Hot Fluid Outlet, Cold Fluid Inlet to match your scenario.
Verify Outputs: The outputs: dT1, dT2, LMTD are updated in real-time on your screen.
Iterate: Change values and compare alternative scenarios to find your optimal result.

Frequently Asked Questions

What does the Heat Exchanger LMTD Calculator calculator do?+

Calculate log mean temperature difference. It is part of the Engineering category on WebCalcSys and provides instant, accurate results. Simply enter your values and the calculator computes the answer in real time — no downloads or sign-ups required.

How do I use the Heat Exchanger LMTD Calculator calculator?+

Enter the required values (Hot Fluid Inlet, Hot Fluid Outlet, Cold Fluid Inlet, Cold Fluid Outlet) into the input fields. The calculator processes your data instantly and displays dT1, dT2, LMTD in real time. You can adjust any input to run what-if scenarios.

What formula does the Heat Exchanger LMTD Calculator calculator use?+

This calculator uses the formula: LMTD = (dT1 - dT2) / ln(dT1/dT2). It is based on standard engineering principles and is trusted by students, professionals, and educators worldwide.