Cooling Tower Case Study
Cooling tower should be installed at an open space with free air motion and unimpeded air supply, siting is normally not an obstacle to satisfactory installation to ensure the operation effective. However, environmental limitation makes cooling tower always located at indoors environment, or placed with enclosures coverage. In such cases, the following factors must be considered such as sufficient free and unobstructed space should be provided. It can ensure sufficient air supply to the cooling tower fan and allow to proper servicing. The discharge air should not be deflected in any case that might be affect air recirculation like Fig. 2.4.1.Recirculation cause increase of the entering wet-bulb temperature, lead to enhance of the temperature …show more content…
After that, start the cooling tower and chiller if the chilled water flows are proven by flow switch.
Oppositely, the stop control sequence of chiller and pump are as following, first shut down the chiller, and then cooling tower, after shut down chiller and cooling tower then turn off the duty chilled water pumps and condensate water pump according to the total running time of each pump. Finally, close the respective motorized valve.
The above procedures should not be reversed, since those procedures reversed will be caused in equipment fault even lead to damage and need to replace.
2.5.2 Control Sequence of PAU
Pre-treated fresh air will be supplied by the Primary Air Handling units (PAU). PAUs are used to suit the loading demand of the office to optimize the fresh air quantity while the indoor air quality is
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Hensley (2009) study in case of cooling tower and found that local heat sources upwind of the cooling tower can elevate the wet bulb temperature of the air entering the tower, thereby affecting its performance. One such heat source might be a previously installed cooling tower on site, or in the immediate vicinity. Fig. 2.6.1 depicts a phenomenon called “interference”, wherein a portion of the saturated effluent of an upwind tower contaminates the ambient of a downwind tower. Although proper cooling tower placement and orientation can minimize the effect of interference, many existing installations reflect some lack of long range planning, requiring that design adjustments be made in preparation for the installation of a new
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