Page 373 - Sustainable On-Site CHP Systems Design, Construction, and Operations

346 Ca s e S t u d y 3

FIGURE 21-1 Rendering of school campus.

3. Two gymnasium wings to accommodate three gymnasiums
4. Auditorium wing
5. Cafeteria wing
6. Central utility plant to accommodate chillers, boilers, pumps, etc.
7. One-story administration annex
8. Two-story common (link) section

Building envelope properties, systems efficiencies, operating schedules (lighting,
occupancy, etc.), and the like are based on the design preliminary design documents
and criteria. A variety of secondary air systems are proposed for the design, these sys-
tems include four-pipe fan coils (FPFC) for classrooms, variable air volume (VAV) with
reheat for the common areas, and admin and single zone (SZ) for auditorium, gymna-
siums, and cafeteria. A summary of the building description is assembled in Tables 21-1
and 21-2.
Since the cost of electricity can vary every hour, the cost of the electricity consump-
tion and demand need to be specified for each hour of the year. Further, there is a dif-
ferent electrical tariff for CHP applications, which will result in different electrical
prices for the proposed CHP system. The electrical energy costs are time-of-use (TOU)
price signals as shown in Tables 21-3 and 21-4 for non-CHP and in Tables 21-5 and 21-6
for the CHP application. The gas price is $7.75/MMBtu based on lower heating
value (LHV).