Retrotec USACE - Manual (Page 100)

78 ENERGY & PROCESS ASSESSMENT PROTOCOL
The powerhouse may also have air compressors that generate compressed
air for process needs or controls. Heat created by compressing the air is
removed by cooling towers using water circulated through coolers on the
compressor.
The central plant systems sometimes need booster pumps to transport
these fl uids to their destination. Chilled and hot water distribution may also
require the use of booster pumps on a large site where changes in elevation are
dramatic. Both central and local systems may have distribution issues for duct-
work and piping systems. Tables 3–5 list potential causes of water and energy
waste and ineffi ciency for central systems and their distribution.
TABLE 3. CAUSES OF WATER WASTE
Problem description Waste/ineffi ciency Reference/appendix
Water system Water leaks Waste D3.1
Heat trace equipment operating above 4.4 °C (40 °F)
outside temperature Waste D3.2
Water supply to buildings no longer in use Waste D3.3
Use of high pressure pumps to service a
remote location instead of use of booster pump Ineffi ciency D3.4
Discharging condensate water rather than
using it for other purposes Waste D3.5
Boiler system Failure to return condensate Waste D4.1.2
Leaks at gaskets, fi ttings, and valves Waste D4.1,3
Leaking steam traps Waste D4.1.4
Overventing the deaerator Waste D4.1.5
Furnace
operations Heated cooling water is wasted Waste D7.8.18
Catering
process High fl ow prerinse spray nozzles use large
volumes of water to rinse soiled wares Waste D7.10.1
TABLE 4. CAUSES OF ENERGY WASTE AND INEFFICIENCY IN CENTRAL ENERGY PLANT
AND DISTRIBUTION SYSTEMS
Problem description Waste/ineffi ciency Reference/appendix
Boiler
systems More than 5% boiler water blowdown Waste D4.1.1
Failure to return condensate Waste D4.1.2
Leaks at gaskets, fi ttings, and valves Waste D4.1.3