Selection of logistics outlet temperature when designing heat exchanger
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When designing a heat exchanger, the flow rate and inlet and outlet temperature of one stream of logistics are known, and the inlet temperature of the other stream of stream is known. Now when designing a heat exchanger, the outlet temperature of the other stream of stream must be selected during design. Experts please discuss, what are the principles for selecting the outlet temperature of this stream of stream? This post was last edited by Houfei Stupid Bird on 2009-4-2 09:42 ]
If the flow rate and inlet and outlet temperatures of the first stream of logistics are determined, then the heat load has been determined. Once the inlet temperature of the second stream of material is determined, it is necessary to determine the outlet flow rate and temperature. The two are in an inverse relationship, that is, the greater the flow rate, the lower the outlet temperature. How to determine the specific method depends on the actual working conditions. 1. The heat exchanger is used as a condenser, and the second material is circulating water. It is generally calculated based on the temperature rise of the circulating water by 8 to 10 degrees. ； 2. The heat exchanger is a reboiler, and the second stream of material is heating steam. The outlet temperature is generally calculated as about 1 lower than the bubble point of the steam. ； Let’s talk about these two situations first, there are more situations, and those who come later will add them.