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Large heat exchanger unit

2021-11-25 14:11:13
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Large heat exchanger unit
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Manufacturers usually use kW to represent the rated power of large heat exchanger units. Like the air heating group in front, the steam consumption can be calculated according to this power. However, the parameters of heat exchanger (especially shell and tube heat exchanger) are much larger than the actual needs.

A certain safety factor is considered in the calculation of heat load of building hot water heating system. Because the non storage heat exchanger is usually selected according to the standard diameter range, it is often much larger than the design parameters.

When selecting plate heat exchanger, if the heat exchanger is brazed or fully welded, its standard series products are usually selected. However, for the gasket plate heat exchanger, its size selection will be much more flexible, and its plates can be increased or reduced according to the required heat exchange surface. In many cases, the selection of heat exchanger is too large only because it is necessary to reduce the secondary side fluid pressure drop.

In the existing plant, the actual load can be calculated according to the inlet and outlet temperature and the pump capacity. However, it should be noted that the capacity of the pump provided by the manufacturer usually refers to the specific head, and in practice, the actual pressure of the pump may be different from it. Calculation of steam consumption of heat exchanger: shell and tube heat exchanger and plate heat exchanger are typical flow heat exchange applications. When selecting heat exchanger, if the start-up is few or the time to reach full load output is not important, the start-up load can be ignored. The heat exchanger is usually selected according to the full load of operation, and a part of safety factor is reserved.

Heat losses are rarely calculated in these types of applications because they are very small compared to the full load of operation. Shell and tube heat exchangers are usually insulated to prevent heat loss and possible harm to human body. The heat exchanger is generally compact in structure, and the heat exchange area exposed to the air is very small.

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