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Retrofitting Strategy |
Conversion to Waterside Free Cooling System
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The system is to save chiller plant electricity consumption by producing chilled water not with a chiller but with a cooling tower operated at low wet bulb temperature of outdoor air in winter. Heat exchanger was used to indirectly connect the condensing water circuit with the chilled water circuit.
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| Consideration
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- When using cooling tower to reject heat from (produce cooling to) the return chilled water of the system, the chiller water supply would be increased to around 15 to 17°C (the wet bulb temperature is about 6 to 9°C), which is much higher than that of the normal supply temperature at 7-8°C. Only sensible cooling would be provided for the enclosed environment.
- When the same cooling tower system is used for condensing water heat rejection of chiller plant in summer and waterside free cooling in winter. The cooling tower should be designed at different operating conditions in both summer mode and winter mode operation.
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| Estimated Saving
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| The retrofit strategies is a mixture of different strategies and the saving estimation should be make reference to other single strategies.
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