How should the air inlet temperature of the air cooler be determined?
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Recently, the staff working on the equipment reported that the air coolers of the unit are not able to provide sufficient cooling capacity during the summer months to meet the production requirements. I examined the original design plan; the inlet temperature for the air was set at 34 degrees, and I’m puzzled as to how this temperature was determined. When designing air coolers, is the temperature of the incoming air generally determined based on the average temperature of the hottest month? In Nanjing, during the summer the outside temperature is usually around 37 or 38 degrees Celsius, and the equipment becomes even hotter. However, when looking at historical weather data from previous years, the temperatures were not that high. I would like to ask those who have experience in this field: who has designed air coolers, and how should the inlet temperature be determined?
This post was last edited by CHANGBAISHI on 2018-6-1 at 13:29. When choosing an air cooler, should one consider whether the outlet temperature meets the requirements of the downstream production processes? Additionally, during the design phase, users are required to provide data on local natural conditions such as hydrogeology, meteorology and climate, and seismic intensity. At the beginning of operation, the equipment requires an acceptance signature; it would be best to check whether there are any issues related to substandard design The production capacity of air coolers is fixed; does the issue of it not matching the actual capacity of the equipment arise only under conditions of extremely high production loads, or due to factors such as the need to reduce costs?
The temperature at this entrance is already 34 degrees – so is it still necessary to lower it further? I think freezing water would be needed to achieve that. Even if you use air cooling to lower the temperature, won’t it rise again naturally given such a high starting temperature?
I’m sorry, I strayed from the topic. Regarding the temperature of the air you mentioned, our air cooling system isn’t cold enough either. After seeing your question, we should check the original design value for the inlet air temperature in the air cooling system to see if it was set too low.
Air coolers are generally designed based on the outdoor ventilation temperature; some manufacturers add 2-3 degrees to this value. However, according to user feedback, even this does not meet the requirements. The safest approach is to use the extreme high temperature as the inlet temperature for the air cooler
It is usually the highest ambient temperature. Because the temperature is different at different times of day. As a conservative approach, the average temperature in August during the summer can be chosen. I think 37 degrees is a reasonable temperature for Nanjing.
For dry air coolers, the air inlet temperature is generally taken as the dry-bulb temperature, that is, the dry-bulb temperature of the atmosphere with a summer occurrence frequency of 5% as determined by temperature frequency statistics, and this value lies between the average temperature of the hottest month and the extreme maximum temperature.