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Steam consumption of the steam exchange unit of the heat exchanger
Aug 23, 2020

Steam consumption of heat exchangers, the term usually refers to shell and tube heat exchangers or plate heat exchangers, in which the main heating medium such as steam is used to heat another medium. Shell and tube heat exchangers used for space heating (whether steam or water is used) are often referred to as non-storage heaters.


The manufacturer usually USES kW to indicate the rated power of the heat exchanger, and the steam consumption can be calculated according to this power, just like the air heating group in the front. However, in general, the parameters of heat exchangers (especially shell and tube heat exchangers) are much larger than what is actually needed.


A certain safety factor is taken into account in the calculation of thermal load of building hot water heating system. Since non-storage heat exchangers are usually selected according to the standard diameter range, they are often much larger than the design parameters.


When choosing plate heat exchangers, if the heat exchanger is brazed or all-welded, the standard series product is usually chosen. However, for the gasket type plate heat exchanger, its size choice will be much more flexible, its plate can be increased or decreased according to the need of the heat exchange surface. In many cases, the large selection of plate heat exchangers is simply due to the need to reduce the pressure drop of the secondary side fluid.


In existing plants, the actual load can be calculated based on the inlet and outlet temperatures and pump capacity. However, it should be pointed out that the manufacturer provides the capacity of the pump usually refers to the specific head reached, and in practice, the actual pressure of the pump may have some differences with it. Calculation of steam consumption of heat exchanger:


Shell and tube heat exchangers and plate heat exchangers are typical flow-type heat transfer applications. When selecting heat exchangers, the start load can be ignored if the start time is small or the output time to reach full load is not important. Heat exchangers are usually selected according to the operating full load, and leave a part of the safety factor.


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

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