EarthWise chilled water systems consume less energy, capital, and water through three main strategies: (1) using colder chilled water which reduces energy usage in chillers and chilled water pumps, (2) maintaining warmer cooling tower water which saves energy in condenser water pumps and cooling tower fans, and (3) implementing thermodynamic staging with series chillers which lowers compressor energy usage. These techniques were shown to save over 2.9 million gallons of water annually in a 10,000 ton chilled water system in Dubai.
1. EarthWise TM Chilled Water Systems Consume Less Energy, Less Capital, and Less Water Donald Eppelheimer, PE Chilled Water Solutions Trane Company LaCrosse, WI deppelheimer @ trane.com
2. Annual Energy Consumption Chilled Water Systems Chiller Cooling Tower Water Pumps 1972 2010 73% 9% 18% 56% 27% 17%
8. Cooling Tower Capital Cost 10000 ton chilled water system 30,000 gpm 20,000 gpm 15,000 gpm 9 cells 23 x 127 ft 386,000 lbs 8 cells 23 x 113 ft 341,000 lbs 6 cells 23 x 85 ft 257,000 lbs
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10. Cooling Tower Energy Cost 10000 ton chilled water system 675 hp 360 hp 225 hp 40/34/30 44/34/30 42/34/30 30,000 gpm 20,000 gpm 15,000 gpm
11. 24000 18000 12000 6000 MWH chilled water 7 0 C 5 0 C tower water 44 0 C chillers tower fans pumps Benefit of Warmer Tower Water