How to chose a suitable pump for a water chiller

Aug 09, 2023

The selection of the water pump is a particularly critical step in the commissioning of the chiller. A suitable water pump can ensure the normal operation of the chiller, save energy and reduce maintenance costs.When choosing a pump for a chiller, there are several factors to consider:

Flow Rate: Determine the required flow rate based on the cooling capacity and specifications of the chiller. The pump should be capable of delivering the necessary flow rate to ensure efficient cooling. The flow rate is typically measured in gallons per minute (GPM) or liters per minute (LPM).

Head Pressure: Consider the required head pressure or pressure drop for the chiller system. It depends on factors such as the length and diameter of the piping, the resistance of the heat exchangers, and any additional components in the system. The pump should be able to provide sufficient pressure to overcome the head loss and maintain the desired flow rate.

Pump Type: Select the appropriate pump type for your application. Common pump types used in chiller systems include centrifugal pumps and positive displacement pumps. Centrifugal pumps are generally more suitable for high flow rates, while positive displacement pumps are better for applications with variable or lower flow rates.

Steps for pump selection

1. Determine the working parameters of the chiller

Before selecting the type of water pump, it is first necessary to clarify the working parameters of the chiller, including cooling capacity, external ambient temperature, cooling water diameter, etc.

2. Choose the right pump type

When selecting models, it is necessary to choose popular pump types, such as centrifugal pumps, axial flow pumps, mixed flow pumps, etc. At the same time, full consideration should be given to indicators such as flow, lift, and efficiency, which can usually be calculated by professional selection software on the market or Refer to the selection manual of the large water pump manufacturer.

3. Determine the pump shaft power and motor power

After the selection, it is necessary to calculate the shaft power of the pump and the corresponding motor power based on the flow rate and head. In general, it is necessary to refer to the parameter manual of the pump manufacturer, or use professional software for calculation.

4. Check whether the matching of water pump and chiller is suitable

After determining the shaft power of the water pump and motor, it is necessary to check the data to ensure that the working range of the selected water pump can match the flow rate, head and other parameters required by the chiller, so as to ensure the normal operation of the chiller.

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