Selection and calculation of the cooling tower pump

A pump is needed to circulate the water in the cooling tower circuit. Basically, in air conditioning systems, circulator pumps are used to move the fluid that transmits temperature and energy, and these types of pumps are also used to circulate water in the cooling tower circuit; Things like chiller capacity, chiller type (aqueous compression or absorption), and chiller condenser type are effective in choosing the cooling tower pump head and discharge.
In general, the characteristics of a pump are two factors: flow rate and head, the amount of which depends on the mentioned factors. The flow rate of the volume of water moved per unit of time and the head of the pressure difference required to make the water flow in the corresponding path is defined. Stay with us so that we can continue with a more complete description of the components affecting the selection and calculation of the cooling tower pump.

Cooling tower pump flow

The flow rate is the volume of water that the water pump can circulate in the cooling tower circuit in units of cubic meters per hour (m3/hr), liters per second (L/s), or gallons per minute (GPM). ) will be measured.
The most important way to determine the flow rate of the cooling tower pump is to refer to the manufacturer's catalog and the declared value for that capacity.
If we want to calculate the flow rate of the cooling tower pump, we can get it by dividing the cooling load of the building by 5000:
GPM (flow) = (Q (Btu/hr))/5000
If the flow rate of the circulator pump is less than the required level, it will cause improper distribution of water, and air escape, and as a result, the efficiency of the cooling tower will decrease. Also, if the flow rate of the pump is more than required, it will cause improper passage of air in contact with water and the cooling tower will suffer from suffocation, as a result, it will cause problems in the system's performance.

Cooling tower pump head

The pump head actually represents the power of the pump and the pressure difference required to make the water flow in the cooling tower circuit is defined. The physical definition of the pump head is the maximum height that the pump can move the fluid up, for this reason, the unit of measurement of the head in circulation pumps is in meters (m) or feet (ft).

The amount of head in the cooling tower circuit (open circuit) is as follows:

+ pressure drop of cooling tower water spray nozzles + height difference of the return path = pump head (ft)
Condenser pressure drop + (1.5 x pressure drop of pipes, valves, and connections of the piping path to the tower)

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Final word

In this article, we tried to provide explanations regarding the selection and calculation of the cooling tower pump. According to what was said, flow rate and head are two important factors in choosing a cooling tower pump. We also saw that if these components are less or more than the allowed limit, we will have a decrease in the performance of the cooling tower, so we must have a careful check before choosing it.
If you want to get more information and get advice, you can contact the sales experts of the air conditioning equipment department in the Damatajhiz specialized group during office hours.

Related Articles

In order to get more information, it is recommended to read the articles related to the selection and calculation of the cooling tower pump.

• How to choose the best cooling tower
• All about the cooling tower
• Arrangement and piping of cooling tower water
• Methods and principles of cooling tower maintenance
• Fiberglass cooling tower

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