Heat exchanger for propylene refrigeration
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For heat exchangers using propylene as a cooling medium, the pressure of the gaseous propylene at the outlet remains constant. What is the effect of the liquid level of propylene within the heat exchanger on the temperature of the material after cooling? Is it better to have a higher liquid level for better cooling effects, or a lower liquid level? Why?
I don’t think the impact is very significant, but a lower liquid level should be better, as it provides more space for heat absorption during vaporization
It’s not good if it’s too high or too low; if it’s too high, the space for gas-liquid heat exchange is limited, and if it’s too low, energy loss is high. That’s just my opinion
There is no doubt that a higher liquid level results in a better cooling effect; on the contrary, if the propylene level is low, the temperature after cooling will be higher. This has nothing to do with the vaporization space, as heat exchange takes place on the outer wall of the tubes. The higher the liquid level, the more tubes are submerged, and thus more heat exchange occurs, resulting in a greater cooling capacity. It has nothing to do with any space.
This post was last edited by longziyun on 2018-9-15 at 10:51. What was said on the 4th floor is correct: this cooler that uses propylene as a coolant takes advantage of liquid propylene at temperatures around -10 to 10°C. Under the pressure in such piping systems, propylene with a vapor pressure that isn’t too high doesn’t undergo any significant phase changes. It’s similar to a water bath cooler in a laboratory, with a cooling coil submerged inside it; of course, submerging the coil completely yields the best cooling effect. Therefore, to achieve good cooling performance, the liquid level of propylene in the shell side must be high.