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Location : Home > NEWS > How to determine the heat exchanger fluid outlet temperature?
How to determine the heat exchanger fluid outlet temperature?

It is not difficult to determine the temperature of the fluid if the technological conditions supply the temperature of the hot and cold fluid in the heat exchanger. The designer should establish the output temperature if one of the fluids is only known to have an import temperature. For instance, when using cold water to cool a hot fluid, the inlet temperature of the cold water can be estimated based on the ambient temperature, and its outlet temperature can be calculated based on economic accounting. This means that you can use less cold water by increasing the heat transfer area, or less cold water by increasing the heat transfer area. They contradict each other.

In general, the water source is abundant in the area to select a smaller temperature difference, the greater the temperature difference between the region with a water shortage. However, temperatures above 45 are generally unfavorable for industrial cooling water because they allow various salts (such CaCO3, MgCO3, CaSO4, and MgSO4) to become more soluble in the water. The exit temperature of the medium can be chosen using the same logic if the heating medium is used to warm the cooling fluid.

The cold fluid and hot flow paths in a tubular heat exchanger can be chosen using the following guidelines:

(1) The unclean and scaling liquid must be treated in the pipe because it is simple to clean.

(2) Corrosive fluid must be used to prevent pipe shell corrosion.

(3) High-pressure treatment needs to be done to avoid pressure on the housing.

(4) The shell side is where the saturated steam must be removed. Due to the cleaner nature of saturated steam, the convection heat transfer coefficient is flow-independent, and the condensate is simple to drain.

(5) To aid in heat dispersion, the cooling liquid must be on the shell side.

(6) It is advised to transfer the shell with a large convective heat transfer coefficient for the rigid structure heat exchanger if the temperature difference between the two streams is significant in order to decrease thermal stress.

(7) The fluid must travel via the shell side if it has a low flow rate and a high viscosity.

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