
What is the impact of temperature on the selection of cooling towers?
Let's learn together what wet bulb temperature is. Wet bulb temperature generally refers to the thermodynamic wet bulb temperature. The thermodynamic wet bulb temperature (adiabatic saturation temperature) refers to the temperature of a system when a lot of water comes into contact with limited moist air under adiabatic conditions, and the latent heat required for water transpiration comes completely from the sensible heat released by the decrease in moist air temperature. When the system reaches a state of full air and thermal equilibrium, the system temperature is reached. Simply put, wet bulb temperature is the temperature that the environment can reach only through transpiration of water at that time, and thermodynamic wet bulb temperature is also known as adiabatic saturation temperature.
If there is wet bulb temperature, there must be dry bulb temperature. So what is dry bulb temperature? Dry bulb temperature is a value read from a dry bulb thermometer that is exposed to the air and not directly illuminated by the sun. It is the temperature measured by a thermometer in general air, which is commonly referred to as the temperature in our weather forecast. The temperature of a dry bulb thermometer is the temperature measured when the thermometer is freely exposed to the air, and it should be protected from radiation and moisture interference. The temperature of a dry bulb thermometer is usually regarded as the actual temperature of the air being measured, which is the real thermodynamic temperature. It is the temperature measured by a general thermometer exposed in an airflow.
What is the connection between the cooling tower and these two temperatures? After testing, it has been proven that the cooling effect of a cooling tower is measured by the difference between the outlet temperature and the inlet temperature, and the difference between the return water temperature and the outlet water temperature of the cooling tower mainly depends on the wet bulb temperature of the surrounding air.
In simple terms, the change in wet bulb temperature directly affects the cooling effect of the cooling tower, where the dry bulb temperature is the ambient temperature; The wet bulb temperature represents the temperature that can be reached by natural transpiration of water in the environment; The combination of the two can indicate the temperature and humidity of the air.
So usually when selecting a cooling tower, we inquire about the wet bulb temperature of the location where the cooling tower is used. The cooling limit of the cooling tower is the temperature that the cooling tower can cool to, which is about 4 degrees Celsius above the local wet bulb temperature.
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