Our project is a college residence hall in downtown Boston. Energy for heating will be purchased from a steam utility company, so the project will not include boilers. In calculating the energy performance of this building above the minimum requirements of ASHRAE 90.1-1999, can we compare a standard efficiency steam boiler as our base case (Energy Cost Budget)and a higher efficiency boiler (reflecting the higher efficiencies of the district steam boilers) as the design case (Design Energy Cost)? For example: To calculate the Energy Cost Budget: A building with an 80% efficient standard steam boiler (as per ASHRAE 90.1 1999, Table 6.2.1F). To calculate the Design Energy Cost: A building with a high efficiency steam boiler with equivalent efficiency as the district steam boilers(typical efficiency 85 to 88 %). We will document the exact efficiency of district steam boilers with a letter from the utility as part of the project LEED documentation.
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