Coaxial Heat Exchanger Calculator


In engineering and thermodynamics, calculating the performance of a coaxial heat exchanger is crucial for various applications, including HVAC systems, refrigeration, and industrial processes. Understanding how to efficiently transfer heat between fluids in a coaxial heat exchanger ensures optimal system design and operation. This article presents a comprehensive guide on using a calculator to determine the heat transfer rate in a coaxial heat exchanger.

How to Use

To use the coaxial heat exchanger calculator, follow these simple steps:

  1. Input the relevant parameters such as the inner and outer diameters of the tubes, the length of the heat exchanger, and the flow rates of the fluids.
  2. Click the “Calculate” button to obtain the heat transfer rate.


The most accurate formula for calculating the heat transfer rate (Q) in a coaxial heat exchanger is given by:


  • Q = Heat transfer rate (W)
  • k = Thermal conductivity of the fluid (W/mK)
  • Tin​ = Inlet temperature of the fluid (°C)
  • Tout​ = Outlet temperature of the fluid (°C)
  • ro​ = Outer radius of the inner tube (m)
  • ri​ = Inner radius of the outer tube (m)

Example Solve

Let’s consider a coaxial heat exchanger where the inner tube has an outer radius (ro​) of 0.05 meters, the outer tube has an inner radius (ri​) of 0.1 meters, the length of the heat exchanger is 2 meters, the thermal conductivity (k) is 100 W/mK, the inlet temperature (Tin​) is 80°C, and the outlet temperature (Tout​) is 50°C.

Using the formula:

The heat transfer rate is approximately 4529.8 W.


Q: What is a coaxial heat exchanger?
A: A coaxial heat exchanger consists of two concentric tubes where heat is transferred between fluids flowing in the inner and outer tubes.

Q: What factors affect the heat transfer rate in a coaxial heat exchanger?
A: Factors such as fluid properties, flow rates, tube dimensions, and temperature differentials influence the heat transfer rate.

Q: Why is calculating the heat transfer rate important?
A: Calculating the heat transfer rate helps engineers design and optimize coaxial heat exchangers for efficient thermal performance.


Understanding how to calculate the heat transfer rate in a coaxial heat exchanger is essential for designing efficient heat exchange systems. By utilizing the provided formula and calculator, engineers can accurately determine the thermal performance of coaxial heat exchangers for various applications.

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