Book - School of Science and Technology

696 Combined heat and power (CHP)Figure 24.7 Circuit diagram of pipe connectionswill be less simple and,once again,if an existing system is to be extended,it would besensible to involve the original designer.Packaged plantIt is fortunate that,in this particular field,a number of suppliers are able to offer standarddesign packages made up from engines,alternators and heat recovery components whichare complementary one to another and pre-wired complete at works to a central controlpanel. Table 24.1 lists the ratings of a selection of the packages available.Plant room accommodationTo avoid noise nuisance to building occupants,steps should be taken to isolate any plantroom accommodating CHP equipment,with particular emphasis upon doors whichshould be heavy and well fitting. As is noted at the end of Chapter 12,openings to admitboth combustion air for the prime mover and ventilation air for removal of heat generatedby equipment generally should be provided with sound-attenuating louvres. If site circumstancesso dictate,it may be desirable to site the equipment at roof level in which case antivibrationmountings and a sectional acoustic enclosure will certainly be required.CHP systems ± criteria for selectionThe principal matter which should be taken into account when either considering avariety of components or selecting a packaged CHP system is the probable load factor,