Classification of heat exchanger types
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When classifying heat exchangers, does specifying the heat exchange area have an impact on the classification? Should it still be determined only by the design pressure? Does the heat exchange area have an impact on category classification?
That’s my personal opinion: the classification of heat exchangers doesn’t have a significant relationship with their heat exchange area. Nor does it have much to do with pressure; only when a heat exchanger also falls under the category of pressure vessels might its classification as a Class 1, Class 2, or Class 3 pressure vessel become relevant. However, if the heat exchange area is fixed, different types of heat exchangers can exhibit vastly different heat exchange efficiencies.
The classification of heat exchangers has nothing to do with their heat exchange area; when the geometric dimensions of the vessel meet the requirements, it is necessary to consider not only pressure but also temperature and the type of fluid in order to determine whether it falls into one category or another – namely, whether it is a category 1, 2, or 3 vessel.
The category of a heat exchanger has nothing to do with its heat exchange area. According to Chapter 1 of the Pressure Vessel Regulations, it can be classified only when its volume, pressure, and medium all meet the required standards; once it can be classified, further subdivision into specific categories is possible.
It seems the poster is a newcomer to the \"pressure vessel\" industry. The classification of container types should be carried out according to the following steps: 1. First, determine whether the container falls under the scope of the Container Regulations based on its operating pressure, medium, volume, and diameter ； 2. Then, based on the design pressure, medium, volume, PV product, as well as the type and material of the container, each pressure chamber is classified in accordance with the provisions of the Pressure Vessel Regulations; the highest category among these classifications is taken as the container’s category. The container category has no relation to the heat exchange area.
Given that the specifications of the heat exchange tubes are standardized and the heat exchange area remains constant, the diameter and volume of the heat exchanger can be calculated. However, the category of the container is determined according to the design pressure, the medium used, the volume, the PV product, as well as the type and material of the container, in accordance with the regulations set out in the Container Regulations; the highest category among these is then adopted as the container category. Therefore, the heat exchange area has an impact on category classification, but not directly.
I believe the classification of heat exchangers has nothing to do with the heat exchange area; it is generally based on their structural form. Or according to the classification of pressure levels. It’s also possible to classify by material