Twelve design points of countercurrent closed cooling tower

Twelve design points of countercurrent closed cooling tower

A countercurrent closed cooling tower is a cooling tower whose air flow is opposite to the direction of the water flow. The water flow in the tower falls vertically inside.

Key points for design and selection of countercurrent closed cooling tower:

1) Counterflow cooling towers should have high cooling efficiency, low energy consumption, low noise, light weight, small size, long life, simple installation and maintenance, and less water.

2) The design and selection of the finished countercurrent closed cooling tower meets the requirements for closed cooling towers in GB 7190.2-1997.

3) If there is a large gap between the design conditions and the standard conditions of the low temperature type cooling tower, it should be selected based on the thermal performance curve provided in the product sample.

3) If there is a large gap between the design conditions and the standard conditions of the low temperature type cooling tower, it should be selected based on the thermal performance curve provided in the product sample.

4) The thermal performance curve provided by the manufacturer, if the test data on the simulation tower is used to draw, the test data of the simulation tower should be corrected according to the difference between the test conditions of the simulation tower and the operating conditions of the design tower, and the correction coefficient 0.80 to 1.00.

5) The position of the closed cooling tower should be kept at a certain distance from the building, and should not be arranged near the heat source, exhaust and flue gas outlets. If the above requirements cannot be met, technical measures should be taken and the thermal performance should be checked. .

6) The circulating cooling water should be free of oils and substances that corrode FRP, and the turbidity of water should not be greater than 50mg / L. And measures should be taken to eliminate algae and stabilize water quality.

7) The design circulating water volume should not exceed the rated water volume of the finished countercurrent closed cooling tower. If the circulating water volume does not reach 80% of the rated water volume, the selected closed cooling tower water distribution system should be checked.

8) The number of closed cooling towers should match the number of air-conditioning refrigeration units.

9) According to the requirements for noise control of civil buildings in the "Environmental Noise Standard for Urban Areas" GB3096-1993, a low-noise or ultra-low-noise closed cooling tower can be selected through the spatial attenuation calculation of the noise. , Further noise reduction measures should be taken.

10) It is advisable to install roof fire hydrants and flushing facilities near the closed cooling tower for fire extinguishing and flushing of sprinkler fillings and sediments inside the tower.

11) The material of the closed cooling tower should be flame-retardant and meet the fire protection requirements. It should be indicated in the main equipment table and the order contract.

12) When selecting the finished countercurrent closed cooling tower, attention should be paid to the coordination and coordination of electrical control.