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Investigation into the High Heat Load of the Main Part of the ZICER Building
The space heating and free-cooling strategy originally in place in the main part of the ZICER building operated using two different control temperatures.
This poor use of thermal mass in the original heating and free-cooling strategy of the ZICER building meant that the building was wasteful in terms of its heating consumption.
Modifications to the Space Heating and Free-Cooling Strategy of the Main Part of the ZICER Building
The main part of the ZICER building did not originally adopt the 24-hour slab control heating and free-cooling strategy that worked well in the EFry building.
With the energy monitoring results as proof of poor operation, the BMS for the ZICER building was reprogrammed to operate on 24-hour slab control.
Moving the ZICER building away from air sensing to operate on slab control was a success.
It was evident from the results that the main part of the ZICER building still consumed more space heating and hot water than the EFry building in the inter-seasonal months and at the start of the summer months.
The scale of reduction in the space heating consumption between the original and new heating strategy of the main part of the ZICER building is illustrated in Figure 8 (only data points less than the UK's base temperature of 15.5[degrees]C were used to construct the graph).
In September 2005, the annual rolling heating and hot water consumption for the main part of the ZICER building stood at 42.8 kWh x [y.sup.-1] x [m.sup.-2].
It has been described that the heating and hot water demand for the main part of the ZICER building was reduced by the change in the building's control strategy.
However, it is normal for modern offices, especially open-plan offices, to be equipped with mechanical ventilation, and the ZICER building figure of 19.1 kWh x [y.sup.-1] x [m.sup.-2] is below the good practice energy consumption value of 22 kWh x [y.sup.-1] x [m.sup.-2] for AHUs in a standard air-conditioned office building (DETR 1998).
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