CTS CHILLED Tower™W Series
Piping Components Business Unit
This system, used to cool semiconductor-production equipment, is compared below with the chilled tower, air-cooled chiller, turbo-refrigeration and gas-combustion cold water generation systems, in terms of power requirement, annual power consumption and annual running costs.
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| Heat needed for cooling purposes | 279kW (240,000kcal/h) |
|---|---|
| Water volume | 48m3/h (800 l/min) |
| Water temperature at inlet | 25°C |
| Water temperature at outlet | 20°C |
| Operating time | 24 hours, 365 days |
| Meteorological conditions | Those of Kanto region |
| Electricity rates | 10 yen/kW・h |
| Basic electricity rates | 1,550 yen/kW・Month |
| Water rates | Clean water 200 yen/m3 Sewage water 190 yen/m3 |
| Gas rates | 44 yen/Nm3 (11,000kcal/Nm3) |
Below are diagrammatic overviews of each system (figures 1-5).
Figure 1: Chilled tower system
Figure 2: Air-cooled chiller system
Figure 3: Water-cooled chilling system
Figure 4: Turbo-refrigeration system (As this system is used in tandem with air-conditioning loads, the figures below reflect only 22% of actual levels.)
Figure 5: Cold water generation system (As this system is used in tandem with air-conditioning loads, the figures below reflect only 22% of actual levels.)
Chart 1: Estimated power requirement, annual power consumption and annual running costs
| Unit | Chilled tower | Air-cooled chiller | Water- cooled chiller | Turbo-refrigerated system |
Cold-water generation system | |
|---|---|---|---|---|---|---|
| Power requirement | kW | 82.7 | 128.9 | 100.1 | 98.9 | 35.5 |
| Annual power consumption |
kW・h | 237,396 | 830,200 | 697,946 | 712,693 | 310,104 |
| Annual gas consumption |
Nm3 | 0 | 0 | 0 | 0 | 156,876 |
| Water consumption | m3 | 4,974 | 0 | 5,735 | 5,662 | 8,777 |
| Annual electricity rates | ¥ | 2,374,000 | 8,302,000 | 6,979,000 | 7,127,000 | 3,101,000 |
| Basic electricity rates | ¥ | 1,538,000 | 2,398,000 | 1,862,000 | 1,840,000 | 660,000 |
| Gas rates | ¥ | 0 | 0 | 0 | 0 | 6,903,000 |
| Annual water rates | ¥ | 1,229,000 | 0 | 1,417,000 | 1,399,000 | 2,169,000 |
| Annual running costs | ¥ | 5,141,000 | 10,700,000 | 10,258,000 | 10,366,000 | 12,833,000 |
In comparison with other systems, the chilled tower system offers savings of 16% ～ 35% in terms of power requirement (excluding the cold-water generation system).
With regard to annual running costs, the system saves
- approximately ¥5.5 million (approximately 52%) compared with the air-cooled chilling system
- approximately ¥5.1 million (approximately 50%), compared with the water-cooled chilling system
- approximately ¥5.2 million (approximately 50%), compared with the turbo-refrigeratied system
- approximately ¥7.6 million (approximately 60%), compared with the cold-water generaton system
proving that it has major merits of economy.