A building pursuing LEED 2009 NC certification will be located in a campus with a District Energy System (DES) that incorporates a CHP, absorption chillers, electric chillers and boilers. This DES will supply 100% of the building’s thermal needs (hot and chilled water). Under this context:
1) What methodology shall be adopted to calculate Proposed Design building energy costs under EAc2 when following option 2 – Full accounting (aggregate building / DES scenario). As this DES includes CHP as well as boilers and electric compression chillers, our proposal is (using as reference document ”Treatment of District or Campus Thermal Energy in LEED v2 and LEED 2009 – Design&Construction”):
a. To use appendix D for CHP modelling
b. To use the general methodology for DES modelling for calculating chilled and hot water energy rates;
2) Does electric energy use of CHP ancillary equipment (e.g.: pumps) need to be accounted? How shall it be included in the energy costs calculations? Please note that there isn’t any reference to this energy use in appendix D (using as reference document ”Treatment of District or Campus Thermal Energy in LEED v2 and LEED 2009 – Design&Construction”)
3) When calculating Xheat (the fraction of CHP plant total thermal energy supplied to the DES) shall the Proposed Building energy use included in the calculations (historic data from meters does includes the new building…)?