EarthWiseTM Chilled Water Systems Consume Less Energy, Less Capital, and Less Water

Donald Eppelheimer, PE

Chilled Water Solutions

Trane Company

LaCrosse, WI

deppelheimer@trane.com

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