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Log Mean Temperature Difference (LMTD) is an indicator of the average temperature difference between the hot and cold fluids in a heat exchanger. It is calculated using the following equation - ΔT 1 → the temperature difference between hot and cold fluids at one end of the heat exchanger.
2 Φεβ 2011 · The simplest case is pure countercurrent flow. Here the mean temperature difference can be expressed in terms of the inlet and outlet temperatures of each stream. For a heat exchanger with countercurrent flow, the mean temperature difference is known as the log mean temperature difference, ΔT LM.
The Log Mean Temperature Difference (LMTD) is a mathematical formula used in the design of heat exchangers to calculate the temperature difference between the hot and cold fluid streams at different points in the exchanger.
A heat exchanger is a system for transferring thermal energy from a fluid to another without mixing them. The heat flow passes through an exchange surface that separates the fluids. The heat exchanger is an essential element in industry.
27 Ιουν 2018 · The log mean temperature difference (LMTD) is the earliest method for analyzing heat exchangers. It provides a convenient method for heat exchanger selection (sizing problems) in which the temperatures are known or can be determined and the size of the heat exchanger is required. Dividing Eq.
In thermal engineering, the logarithmic mean temperature difference (LMTD) is used to determine the temperature driving force for heat transfer in flow systems, most notably in heat exchangers. The LMTD is a logarithmic average of the temperature difference between the hot and cold feeds at each end of the double pipe exchanger.
Calculation method. The heat load of a heat exchanger can be derived from the following two formulas: 1. Heat load, Theta and LMTD calculation. Where: P = heat load (btu/h) m = mass flow rate (lb/h) c p = specific heat (btu/lb °F) δt = temperature difference between inlet and outlet on one side (°F) k = heat transfer coefficient (btu/ft 2 h °F)
