The energy consumption is calculated from a combination of the three different reduction measures as discussed in the previous sections. The heating, electrical and CHP savings for the high-rise case study are presented below.
Waste heat is negative meaning that 8% of the hot water demand will have to be derived from the electric immersion heater. The % CHP electricity is defined by the % of the electrical load which the CHP can cover. It is low at 48.5% as the CHP has been sized only to cover the electricity baseload. For all other calculation assumptions please go to the downloads for the spreadsheet.
The graph on the left shows the orignal "total energy consumption" breakdown for a highrise. The graph on the right shows the impact of the different energy saving measures.
Using the standard coefficients of embodied Carbon dioxide per kWh demand for both natural gas and national grid electricity, we can calculate the carbon footprint of these different energy saving measures.
In the graph below, it is clear that the biggest contribution to carbon savings is reducing the load itself. This is evident because of the assumption of electrically heated highrise block. However, it is interesting to see that even by only covering the hot water load with the CHP can see considerable carbon savings of 82 tonnes per year per building.
© University of Strathclyde 2009
