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Low
Water distribution is inside the cooling tower at about 3.5m height above basin top level Low pump head required |
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High
Water distribution tray is on the top of the tower at about 7m height above basin top level High pump head required |
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| Higher the height, higher the pumping head required |
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| Water distribution system |
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| Water distribution is inside the cooling tower, protected from outside atmosphere and sun. Hence no algae formation and no setting of dust, dirt and leaves |
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| Water distribution tray is outside the cooling tower, exposed to atmosphere and sun, thus causing algae formation and setting of dust, dirt and leaves in the tray |
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| Exposure to sun and atmosphere causes algae formation and setting of dust, dirt, leaves etc. in the tray |
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| Hot air recirculation is completely eliminated. Since air entry is all around from the bottom of casing and above basin top level, fan discharge and air entry are well separated, re-circulation of hot air is not possible |
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| Recirculation of hot air takes place. Since air entry and air discharge are close by and air entry is through-out the vertical section of the cooling tower, the discharge of hot air entering into cooling tower is unavoidable resulting in recirculation of hot air in the cooling tower |
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| Hot air recirculation in the cooling tower reduces the efficiency of the cooling tower |
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| Easy and can be done through air entry section |
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| Difficult, as basin is directly below the PVC fills |
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Cleaning of cooling tower basin is required for maintaining the quality of water for better heat transfer.
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| The height of PVC fills is low (approx 900 mm) and spread across the entire horizontal cross section of the tower. |
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| The height of fills is more and spread partly across the horizontal cross section of the tower |
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| Lower the fill height, lower pumping head. |
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| Site activity is reduced to less than 50% and less labour force is required. Frp top section is totally factory moulded and supplied as ready for assembly / installation at site, which normally takes about 10 to 12 weeks. |
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| RCC casing and entire civil work takes minimum 8 to 10 weeks involving a large labour force |
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| Easy to construct. Reduction in site activity and labour force, hence economical in cost and time |
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