Handbook for heating and ventilating engineers . he line and a corre- DISTRICT HEATING 265 spending reduction in pipe sizes. Yacuum returns may be ap-plied to central station work the same as to isolated plants. The principles involved in the power plant end of asteam heating system may be represented by Fig. 119. Itwill be seen that the exhaust steam from the engines or tur-bines has four possible outlets. Pasising through the oilseparator, which removes a large part of the entrained oil,part of the exhaust steam is turned into the heater for use inheating the boiler feed water. The rest of t
Handbook for heating and ventilating engineers . he line and a corre- DISTRICT HEATING 265 spending reduction in pipe sizes. Yacuum returns may be ap-plied to central station work the same as to isolated plants. The principles involved in the power plant end of asteam heating system may be represented by Fig. 119. Itwill be seen that the exhaust steam from the engines or tur-bines has four possible outlets. Pasising through the oilseparator, which removes a large part of the entrained oil,part of the exhaust steam is turned into the heater for use inheating the boiler feed water. The rest of the steam passeson into the heating system. If there be more exhaust steamthan Is necessary to supply the heating system, the balancemay go to the atmosphere through the back pressure the heating system is not in use, as would be the casein the four warm mionths of the year, the exhaust isteam maybe passed into the condenser. I BYPASS AROUND METATCRBACKPRESSURE VALVE TOHEATER ANDBACK DRES5 VALVE V EPaRATOR TOHEATINOSY3TEM TOCONDENSCR. ?TO SEWERSTEAM TRAP LIVE 3TEAMFROM BOILERS Fig. 119. It is very evident, from what has been said before, thatit Wiould not be economical to condense the steam in acondenser as long as there is a posisibiMty of using it in theheating system. The increased gain in efficiency, when con-densing the exhaust steam under va-cuum, is very i&mall com-pared to the gain when this same steam is used for heatingpurposes. It wiould be also very poor economy to use anylive steam for heating when there were any exhaust steamwasted. When the anaount of exhaust is-team is inisufficient,live &team is admiitted through a pressure reducing \Talve. 175. Drop in Pressure and the Diameter of the Mains:—The flow of steam in a pipe follows the sfoane general law as i 266 HEATING AND VENTILATION the flow of water. Tlie loss of head may be representedby the well known formula hf = (101) gd where hf = loss of head In feet, <p = coefflaient of friction,f = velo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
