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Keep up to dateTable 1: Emissions comparison | |||||||
Bidder | Type | Case | CO2(kg) | CO(kg) | NOx (kg) | SO2 (kg) | % Saving |
1 | Space heating | worst | 16.149 | 0.011 | 0.013 | 0 | 9.8 |
Space heating | typical | 14.575 | 0.009 | 0.011 | 0 | ||
Electrical | worst | 12.761 | 0 | 0.032 | 0.063 | 51 | |
Electrical | typical | 6.256 | 0 | 0.016 | 0.031 | ||
2 | Space heating | worst | 17.471 | 0.011 | 0.014 | 0 | 10 |
Space heating | typical | 15.722 | 0.01 | 0.012 | 0 | ||
Electrical | worst | 11.353 | 0 | 0.028 | 0.056 | 38.3 | |
Electrical | typical | 7.002 | 0 | 0.018 | 0.034 | ||
3 | Space heating | worst | 16.615 | 0.011 | 0.013 | 0 | 15 |
Space heating | typical | 14.128 | 0.009 | 0.011 | 0 | ||
Electrical | worst | 8.867 | 0 | 0.022 | 0.044 | 26.2 | |
Electrical | typical | 6.546 | 0 | 0.016 | 0.032 |
Table 2: Natural daylight | |||
Bidder | General classroom DF | CLD Classroom DF | Savings from lighting control MWh |
1 | 5.66% | 3.55% | 27.5 (65.0%) |
2 | 3.62% | 3.40% | 27.2 (61.8%) |
3 | 4.64% | 3.89% | 26.9 (64.7%) |
Table 3: Carbon dioxide levels comparison | ||||
This involved analysing the CO2 levels for the summer (May to June) | ||||
Bidder | Zone | Room CO2 concentration (ppm) – hours in range | ||
%3E800 | %3E1500 | |||
1 | CLD classroom | 181 (51%) | 46 (13%) | |
General classroom | 191 (54%) | 24 (7%) | ||
2 | CLD classroom | 66 (19%) | 32 (9%) | |
General classroom | 119 (34%) | 45 (13%) | ||
3 | CLD classroom | 222 (63%) | 31 (9%) | |
General classroom | 274 (78%) | 109 (31%) | ||
Note: Bidder 3’s design performs the poorest due to CO2 mixing in the corridor and with air returning to some classrooms dependent on the wind direction. The stack effect design would work more effectively to reduce CO2 if the classroom stacks were independent. Bidder 2’s design performs well with CO2 below 800ppm over two-thirds of the time. |
Table 4: Temperatures comparison | ||||
This involved analysing the temperatures for the summer period of May to September. The average number of hours for CLD classrooms was calculated for occurrences over 24ºC, 26ºC and 28ºC. | ||||
Bidder | Zone | Air temperature ºC – hours in range | ||
%3E24 | %3E26 | %3E28 | ||
1 | CLD classroom | 422 (48.0%) | 131 (14.9%) | 24 (2.7%) |
General classroom | 151 (17.1%) | 45 (5.1%) | 11 (1.2%) | |
2 | CLD classroom | 134 (15.3%) | 19 (2.2%) | 3 (0.3%) |
General classroom | 197 (22.4%) | 36 (4.0%) | 7 (08%) | |
3 | CLD classroom | 183 (20.8%) | 8 (0.9%) | 0 (0%) |
General classroom | 108 (12.2%) | 6 (0.7%) | 0 (0%) |