Selection parameters of combined air conditioning unit

1. Determine the specific model based on the air volume of the combined air conditioner unit . From a cost perspective, the headwind speed of general comfort air conditioners is 3m/s, such as shopping malls, office buildings, etc.; the headwind speed of clean or process air conditioners is 2.5m/s, such as hospitals and electronic factories.

2. After determining the cooling capacity, select the appropriate number of tube rows based on the sample. If the number of rows is larger, the cost will increase, and the wind pressure accompanying the demand will also increase, which may lead to an increase in motor demand. Let the design check and confirm. This needs to fill in the air inlet working conditions and the chilled water inlet and outlet temperature used. Return air condition: directly select the number of rows of surface cooler tubes on the sample. Fresh air working condition: directly select the number of rows of surface cooler tubes on the sample. Mixed air condition: The theoretical calculation is to determine the inlet air condition point after mixing the new return air volume, and then compare it with the outlet air condition to obtain the specific cooling capacity (given the temperature difference between inlet and outlet water), which can also be estimated based on the difference in new return air.

3. A conventional unit has only one fan section, so you only need to fill in the supply air volume and supply air static pressure. If it is a dual-fan unit, you must also fill in the air volume and residual pressure (static pressure) of the return air fan (exhaust fan).

4. Motor form: Generally, there are no special requirements for fixed frequency configuration. If there is a need for variable frequency, choose variable frequency. When choosing variable frequency, you need to pay attention to whether you need to configure a frequency converter. The price of this frequency converter may be more expensive than a variable frequency motor.

5. The unit is left and right, facing the return air direction. Normally, if the water pipe and access door are on the left, it is a left-hand unit, and vice versa is a right-hand unit.

6. Pay attention to the direction of the air outlet and whether it has an air valve.

7. The DDC is configured for automatic control, and the electric control box is configured for manual control switch.