For the environmental conditions of a running chiller, the load has become a constant value. At this time, the condensation heat load is also a constant value. It is stipulated that the temperature difference between the inlet and outlet water is 5℃, the cooling water volume must also be a specific value, and the flow rate is inversely proportional to the temperature difference between the inlet and outlet water. Therefore, for the operation of the chiller, it is only necessary to specify the temperature difference between the inlet and outlet water of the cooling water. This flow rate is usually controlled by the pressure drop of the cooling water entering and exiting the condenser. Under standard working conditions, the pressure drop of the condenser inlet and outlet water is set to 68.6 kPa (0, 7kg/cm:).

Several aspects to pay attention to when using a chiller:

1. Selection of injection molding machine chiller model size

When used to cool the mold of an injection molding machine, it can be calculated based on the injection volume of the injection molding machine. Generally, a 1HP chiller is required for every 6 ounces of injection volume. For example: The customer factory is 100T (5.5OZS) × 3 units; 150T (12OZS) × 4 units; 200T (23OZS) × 3 units; the required chiller size is (5.5×3+12×4+23×3)/6=22.25, which means a 25HP chiller is required. When used for cooling other equipment, it depends on the specific flow rate of the cooling water circulation.

2. Selection of insulated water tank and water pump for chiller

Sometimes, depending on the actual situation of the customer's factory, the box-type chiller may also need an external water pump. In this case, the model of the external water pump must be the same as the power of the water pump that comes with the chiller. For example, if a 10HP box-type chiller comes with a water pump power of 2HP, when an external water pump is added, it must also be 2HP. The water pump power requirements are the same as those of the box-type chiller of the same model. For an open-type chiller, an external water pump is required.

3. The temperature of the return water of the chiller should not be higher than 40 degrees. The higher the return water temperature, the greater the damage to the compressor.