This paper focuses initially on the calculation of the flows of exergy corresponding to the energy demand of buildings for the following uses: heating and cooling in the air handling units, local (room level) heating and cooling, lighting, ventilators and electrical appliances. The calculation method is presented as well as its implementation in the existing energy-calculation software. The effect of the temperature of the supply system for heat and cold is discussed.
The paper then deals with the exergy delivery at room level, with the exergy consumption at the meter box and with the final building exergy consumption. The exergy demand is based purely on physical balances between the building being maintained at a defined level of comfort and its environment, whereas the final exergy consumption is dependent on the type and efficiency of the energy distribution and generation systems. The method used to estimate the exergy delivery at room level, the exergy consumption at the meter box and the final exergy consumption in the early design stage is explained. Initial conclusions are drawn about the discrepancies between the exergy demand of the building and its final exergy consumption on one hand, and about the discrepancies between the energy analysis and the exergy analysis on the other.
|Title of host publication||Proceedings of the ninth international IBPSA conference Building simulation 2005|
|Editors||I Beausoleil-Morrisson, M Bernier|
|Place of Publication||Montreal|
|Number of pages||8|
|Publication status||Published - 2005|