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S. 2 End Use Consumption by Task Finally, one must know the end use category — space heating, cooling, water heating, or lighting — in order to assess whether DG is appropriate for a given sector. Space heating and lighting are generally the largest energy loads in commercial office buildings. In 1995, energy consumed for lighting accounted for 31% of commercial energy loads. Space heating consumed 22%, and space cooling consumed 15% of commercial energy loads. On average, water heating is not high at 7%, but this average is largely variable.
Space heating consumed 22%, and space cooling consumed 15% of commercial energy loads. On average, water heating is not high at 7%, but this average is largely variable. Health care facilities and lodging are unique in their high water heating loads; however, offices, mercantile and service facilities, and warehouses require minimal hot water. ©2001 CRC Press LLC 0074_ch01_fm Page 26 Tuesday, September 3, 2002 12:58 PM Another approach to considering the data in the preceding figure is to consider the end uses aggregated over all buildings but further disaggregated over the nine main end uses in commercial buildings.
The key barriers to MT usage include maintenance cost (the exact costs are unknown but are expected to be lower than ICEs due to fewer moving parts) questionable part load efficiency (manufacturer’s data vary), limited field experience, use of air bearings is desirable to reduce maintenance but air filtration requirements are stringent, and high frequency noise is produced but is relatively easy to control. 3 Photovoltaics Photovoltaic (PV) cells directly convert sufficiently energetic photons in sunlight to electricity.
