I have a headache problem (cooling tower). Can any expert come in and give me some advice?
Thread Content
Look at the picture, use circulating water to cool the flue gas. I consulted the cooling tower manufacturer and found that the water temperature in the same cooling tower dropped from 37°C to 32°C in summer without any problem. What I am confused about is winter. I think the average winter temperature in Guangdong is 10°C, and the wet bulb temperature is a few degrees lower than the air temperature. The cooling tower water should be able to drop to 13°C, no problem, right? However, after asking many manufacturers, they either said that they have never encountered such working conditions, or that it is impossible and must be calculated based on the wet bulb temperature of 28°C. I'm very confused. Are the cooling towers designed with a default wet bulb temperature of 28°C, without considering the operating capacity at low temperatures in winter? The same cooling tower has the same outlet water temperature data when it is operated in summer, and the same outlet water temperature data when it is operated in winter?
Generally speaking, 28°C is selected for design. When the temperature is low in winter, the minimum load of the condenser is calculated. The temperature of the flue gas outlet is adjusted by controlling the refrigerant water circulation volume and the frequency conversion of the fan at the top of the cooling tower.
If you only run it in the winter, design it for your winter conditions.
Manufacturers base their calculations on the harsh conditions of summer~~ As for winter, you can make your own estimates~~
To be honest...the outlet water temperature of your water tower should be 13 degrees...I don't believe it. Firstly, your water tower can withstand other heat sources. Secondly, your windmill can be turned off to save power. Thirdly, the return water from your water tower can be bypassed. Directly enter the water tower mountain without turning around. Turn around. Don't turn around. People turn around.
First understand the process and then discuss the design calculation. The design of this thing is based on the control upper limit, and the lower limit is adjusted according to the environment using control means.
This post was last edited by xzm881122 on 2019-7-14 14:07 Sometimes the brain needs to be more active. It can reach the required temperature in summer, and it can definitely be done in winter. Why must it run at full load when the temperature is low in winter? Furthermore, many manufacturers may not fully understand this technology. All they need to do is run the software according to the design conditions. What you are asking seems to be beyond the scope of people’s knowledge.
The manufacturer designed the cooling tower so that the water temperature drops from 37°C to 32°C in summer. How low can it be dropped under the same operating conditions in winter? I asked this question to many manufacturers but couldn't answer it.
In winter, you should consider changing the operating parameters of the cooling tower unit, such as stopping several fans, stopping a circulation pump, etc. The overall operation is close to the design conditions. To save energy.
This is not a dividing wall air cooler. You can use this to calculate. In fact, the cooling tower exchanges heat through water evaporation, not through heat exchange with air. So your idea is partially wrong.