Industrial Coolers: Problems and Solutions
For the optimum use of industrial equipment, it is essential to keep them at an optimum temperature by proper cooling. The industrial coolers are perfectly fit for this purpose.
When the air quality degrades and workers do not get fresh air due to poor air quality, the condition is termed as sick building syndrome. The main reason is that the industry outlets are very high and thereby inflow of air tends to be difficult.
Air flow is the most important factor in air cooler operation. It changes depending upon ambient air temperature. When air flow reduces, cooling capacity also reduces along with efficiency.
With an increase in pressure drop in the tube bundle, the air flow decreases. This is called dirty tube bundle and it can be removed by regular cleaning. It is detected by developing an air flow profile.
The reverse flow of air is another common problem found in old coolers and causes loss of air. As the return is air is sucked by the suction fan so inlet temperature also rises. This problem is also detected by air velocity profile development. This can be corrected by sealing the plenum gap which must be limited to 3/4 inch. Sometimes a gap in the hub or motor may also cause reverse air flow. This is eliminated by inserting appropriate hub seal.
The blade pitch also must be proper to avoid any problem with the cooler. The optimum range is 12 to 17 degree for blade pitch. Above all, you must ensure that the motor runs at full load to confirm peak air flow.