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EarthWiseTM Chilled Water Systems Consume Less Energy, Less Capital, and Less Water
Donald Eppelheimer, PE
Chilled Water Solutions
Trane Company
LaCrosse, WI
204/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
ChillerCooling TowerWater Pumps
1972 2010
73%73%
9%9%18%18%
56%56%
27%27% 17%17%
Annual Energy ConsumptionChilled Water Systems
304/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Chilled Water System10,000 cooling tons
Dubai, UAE
70C
400C
404/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Benefit of Colder Chilled Water
TMBH
EWT
WTR
LPS
576.5
7 C
6 C
7.3
575.6
5 C
9 C
4.8
504/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
24000
18000
12000
6000
MWH chilled water
70C 50C
chillers
tower fans
pumps
Benefit of Colder Chilled Water
604/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
EarthWise Chilled Water Systems
• Colder chilled water reduces energy consumption
– Chilled water pumps
704/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Chilled Water System10,000 cooling tons
Dubai, UAE
70C
400C
50C
440C
804/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Cooling Tower Capital Cost10000 ton chilled water system
30,000 gpm
20,000 gpm
15,000 gpm
9 cells23 x 127 ft386,000 lbs
8 cells23 x 113 ft341,000 lbs
6 cells23 x 85 ft257,000 lbs
904/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Cooling Tower Capital Cost
• Cooling tower capital cost is not a function of chiller capacity
• Cooling towers are sized by the amount of water they process
1004/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Cooling Tower Energy Cost10000 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
1104/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
24000
18000
12000
6000
MWH chilled water
70C 50C
tower water
440C
chillers
tower fans
pumps
Benefit of Warmer Tower Water
1204/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
• Colder chilled water reduces energy consumption
– Chilled water pumps
• Warmer cooling tower water saves energy
– Condenser water pumps
– Cooling tower fans
EarthWise Chilled Water Systems
1304/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
lift
refrigerant mass flow
compressor work
Compressor Energy
1404/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
lift
cooling capacity
compressor work
40 C
7 C
33 C
Compressor Energy
1504/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Thermodynamic Staging
44 41.5 39 36.5 34
16 13 10 7 4
lift32.5 C
1604/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
lift
cooling capacity
compressor work
44 C
4 C
~32 C
Thermodynamic Staging
1704/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
24000
18000
12000
6000
MWH chilled water
70C 50C
tower water
440C series chillers
chillers
tower fans
pumps
Benefit of Series Chillers
1804/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Cooling Tower Water Consumption
• Chilled water pump power is rejected to atmosphere by the cooling tower
• Compressor power is rejected to atmosphere by the cooling tower
• Condenser water pump power is rejected to atmosphere by the cooling tower
1904/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Chilled Water System10,000 cooling tons
2004/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
Cooling Tower Water Savings10000 ton Chilled Water System
Colder Chilled Water 747,100 gallons
Warmer Tower Water 427,350
Series Chillers 1,750,900
EarthWise Total 2,925,350 gallons
11,090 cubic meters annually
2104/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
2204/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
2304/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
2404/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
2504/09/23 CONFIDENTIAL AND PROPRIETARY – © Trane 2007 – All rights reserved
EarthWise Chilled Water Systems
• Colder chilled water saves energy
– Chilled water pumps
• Warmer cooling tower water saves energy
– Condenser water pumps
– Cooling tower fans
• Series chillers save energy
– Compressors
• EarthWise saves water
– Chilled water and condenser water pumps
– Series chillers