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CRISTOPIA NEWS |
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The Newsletter of Cristopia Energy Systems |
Number : 19 |
Date: Sept. 2001 |
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CRISTOPIA NEWS |
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The Newsletter of Cristopia Energy Systems |
Number : 19 |
Date: Sept. 2001 |
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Reduction of CO2 Emissions with CRISTOPIA's STL |
Traditional air conditioning systems rarely operate at full capacity. They usually operate during the day to meet the building demand and remain idle at night. Chillers are selected to satisfy the maximum instantaneous cooling demand, which occurs only a few days each year. Similarly, industrial refrigeration systems provide cooling for a wide variety of applications, many of which require high cooling capacities for a short periods only (corresponding to the production cycles).
Depending on the chiller technology it is estimated that the
operation of chillers at partial capacity leads to a 10% to 30% increase of
electrical consumption. If we retain a mean value of 15% to take into
account the thermal losses in the STL (< 5%), the reduction of CO2 emissions
by the STL is important. The example below demonstrate the calculation.
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Case
study 2 |
Traditional A/C system |
A/C System with an STL |
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Peak demand |
500 kW |
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Daily energy consumption |
3760 kWh |
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A/C period |
10 hours: 9:00 to 19:00 |
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Chiller |
500
kW |
250
kW |
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STL |
- |
STL
- AC.00- 23 |
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Energy shifted by the STL |
- |
1290
kWh |
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Over consumption (15% and assuming a COP of 3) |
(3760/3)*0.15
= 188 kWhelec |
0
kWh |
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CO2 emissions per day due to the
over consumption (0.3 kg per kWh during the day) |
188*0.3
= 56.4 kg |
- |
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CO2 emissions per year (6 months of A/C) due to the over consumption |
10 293 kg |
- |
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CO2 emissions per year (12 months of
A/C) due to the over consumption |
20 586 kg |
- |
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Saving of CO2 emissions per year
and per m3 of STL |
- |
between
447 and 895 kg of CO2 / m3 |
In conclusion, the STL is an efficient technology for reducing the CO2 emissions by increasing the efficiency of the system. The saving of CO2 emissions is between 447 and 895 kg of CO2 per m3 of STL and per year.
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Cristopia Energy Systems
: 78, chemin du Moulin de la Clue - Quartier Cayrègues -
06140 Vence - France Tel : 33 (0) 4 93 58 4000 - Fax : 33 (0) 4 93 24 29 38 |