Dear Martin,
“Purchased” can be a couple of different, similar ideas:
1. Some cities sell steam, hot water or chilled water to customers in their locale. It is produced in a central plant and then distributed to the buildings nearby. These customers thus purchase heating, cooling or both.
2. Some large commercial, industrial or institutional campuses use a central power plant to provide heating and cooling for the buildings on the campus. Although the individual buildings do not “purchase” the service, it is not generated within the building. In addition the part load efficiencies are not the same as the individual buildings (since they correspond to the entire campus part loads) and so you do not want to assign a specific boiler or chiller to the E+ Plant.
Hope that helps!
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: Ene
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