The influence of circulating water pressure and return water pressure on cooling effect
Thread Content
How do the circulating water pressure and return water pressure affect the cooling effect?
Pressure has little effect, mainly flow and temperature
Purely from the perspective of heat transfer coefficient, there is almost no impact. However, if the resistance is too large, which affects the flow of the pump, the heat transfer effect will decrease significantly.
The return water pressure will affect the circulating water flow rate. In Principles of Chemical Engineering (Chen Minheng) it is written above: If the heat transfer coefficient of the cold fluid is equal to or smaller than the heat transfer coefficient of the hot fluid, changing the flow rate of the cooling medium will cause a large change in the logarithmic average temperature difference and the heat transfer coefficient K.
I don’t agree with the statement on the first floor. The circulating water pressure difference is small and the relative flow rate is small. The pipe diameter of the return water is larger than that of the supply water. If the supply water pressure is small, the return water is also low.
Back upstairs, "If the pressure difference of circulating water is small, the flow rate is also small." Why do I think there is a problem with this sentence? The flow rate is basically determined after the pump is selected, and the fluctuation will not be too large. If it is in a network, then where the pressure drop is small, the amount of circulating water passing through should be large.
Pressure or pressure difference has little effect on the cooling effect. What mainly affects the cooling effect is the flow rate and temperature difference. It is true that the pressure difference may affect the flow rate, but in the end, the heat transfer system can only be affected by the flow rate.
This post was last edited by sexman on 2017-6-12 17:00. What was said on the second floor and the seventh floor is reasonable, but how to balance the pressure difference and flow rate? There is also the accumulation of dirt. Can you guys explain it to me? * Down!
Can the return water pressure go to the tower if it is 0.05?
Q=CMδT, indicating that heat transfer has nothing to do with pressure