What causes the water inlet temperature of the heat exchanger to be extremely high?
Thread Content
Our heat exchanger currently uses a spiral plate type, with water as the heat transfer medium； Water enters from above and exits from below, and hot fluid also enters from above and exits from below. Under such circumstances, our return water temperature is 90 degrees, and it is possible that the supply pipe is also gradually heating up due to the narrow diameter of the return pipe. The water vaporizes due to the high water temperature, and the return pipe vibrates. May I ask, is this situation not suitable for using spiral plate heat exchangers? How should this phenomenon be eliminated
Based on what the poster has described, the rate at which heat is removed by your heat exchange equipment is insufficient; the return temperature of the cooling water has reached 90 degrees. As for using a spiral plate heat exchanger, I don’t see any problem with that, since the medium involved is water. The solutions to this problem are 1. increasing the flow rate of cooling water, and 2. replacing the heat exchanger to increase its heat transfer area. If your factory does not address this issue promptly, I believe your spiral plate heat exchangers will break down soon, as water hammer has already occurred.
Increase the constant-pressure setting of the circulation pump (for example, by raising the water tank height) to boost the circulation flow rate, or replace it with a circulation pump that offers a higher flow rate and lower NPSH, in order to reduce the return water temperature.
May I ask: What is water hammer phenomenon? How can the heat exchange area be increased, unless a new heat exchanger is installed? My water inlet diameter is 25, and the water supply pressure is 2.5 kilograms ； The return pipe diameter is 32. Is it due to an insufficient amount of water in circulation, or is the return pipe diameter too small? Is it still the case that the circulating water enters from above and exits from below, which is not in line with the conventional pattern of entering from below and exiting from above? ?