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Heat Exchanger Duty Equation:
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The Heat Exchanger Duty Equation calculates the thermal energy transfer rate in a heat exchanger. It is fundamental in determining the performance and sizing of heat exchangers in various engineering applications.
The calculator uses the Heat Exchanger Duty equation:
Where:
Explanation: The equation quantifies the rate of heat transfer based on the heat transfer coefficient, surface area, and the temperature driving force.
Details: Accurate calculation of heat exchanger duty is essential for designing efficient thermal systems, optimizing energy usage, and ensuring proper equipment sizing in industrial processes.
Tips: Enter the overall heat transfer coefficient in W/m² K, heat transfer area in m², and log mean temperature difference in K. All values must be positive.
Q1: What is the overall heat transfer coefficient (U)?
A: The overall heat transfer coefficient represents the combined thermal resistance of all materials and fluids involved in the heat transfer process.
Q2: How is LMTD calculated?
A: LMTD is calculated using the temperature differences at both ends of the heat exchanger, providing an average temperature driving force.
Q3: What are typical values for U in different applications?
A: U values vary widely depending on the fluids and materials, ranging from 10 W/m² K for gas-to-gas to over 1000 W/m² K for liquid-to-liquid heat exchangers.
Q4: Can this equation be used for all types of heat exchangers?
A: This equation is primarily used for steady-state calculations in simple heat exchanger configurations. Complex geometries may require corrections.
Q5: Why is heat exchanger duty important in system design?
A: It helps determine the required size and configuration of heat exchangers to meet specific thermal performance requirements in various applications.