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Portable room air cleaners with HEPA filters can be used if ventilation is poor or outside air has high level of PM 2.5. [122] Air filters are used to reduce the amount of dust that reaches the wet coils. [citation needed] Dust can serve as food to grow molds on the wet coils and ducts and can reduce the efficiency of the coils. [citation needed]
Deep water source cooling (DWSC) or deep water air cooling is a form of air cooling for process and comfort space cooling which uses a large body of naturally cold water as a heat sink. It uses water at 4 to 10 degrees Celsius drawn from deep areas within lakes, oceans, aquifers or rivers, which is pumped through the one side of a heat exchanger .
After being granted an audience with the Yang di-Pertuan Agong to discuss the issue, Bersih subsequently agreed on 5 July 2011 to move the rally from the streets to Stadium Merdeka. [9] [10] Estimates of the turnout on 9 July 2011 ranged from 10,000 to 50,000. The police deployed tear gas and water cannons to break up the protest and arrested ...