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Precautions for Selecting Heat Exchangers
Created on 08.15
(1) Although the steps for selecting a heat exchanger are simple, they contain a wealth of content. It requires both theoretical depth and practical experience. Ultimately, it boils down to carefully comparing and analyzing the available heat exchangers and selecting them based on their performance rankings.
(2) When selecting a heat exchanger, the investment cost is not necessarily the most important factor. In some cases, to ensure reliable continuous operation and convenient maintenance, it is justifiable to have a higher equipment cost. Otherwise, even a short - term production stoppage can result in losses exceeding the investment difference. However, in other cases, such as in a workshop with 30 soaking pits, a malfunction in one pit is not a major issue, so a lower investment cost can be considered.
(3) When several heat exchangers can meet the technical requirements, the one with the minimum sum of fixed costs and variable costs within a certain period (usually one year) should be selected first.
(4) From the economic accounting of heat exchangers, a high - efficiency heat exchanger does not necessarily mean it is an excellent one. In fact, a heat exchanger with the smallest possible heat transfer area and the largest possible heat transfer rate is both economical and excellent.
(5) The most appropriate operating time of the heat exchanger should be considered. After the heat exchanger is in operation, fouling will occur on the heat transfer surface. Over time, the fouling gradually thickens, reducing the heat transfer coefficient and thus the heat transfer. When the heat transfer coefficient drops to a certain value, the operation should be stopped for descaling. Therefore, there is an optimal operating time for the heat exchanger.
(6) When choosing a pre - heating method and selecting a heat exchanger, a detailed technical and economic analysis should be carried out first. However, due to limitations, it is often difficult to conduct a comprehensive technical and economic analysis.
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