Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ondition. This steam gives up heat to thepiston head so that the steam entering the cylinder meets apiston surface that is warm while the head and walls are heated 228 HEAT ENGINEERING to the temperature of the incoming steam on one side and to atemperature higher than this by the superheated steam on theother side. The part of the cylinder near the center which is in0 contact with the low pres- sure or exhaust steam iscut off by the piston fromcontact with the fresh curves of Fi
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ondition. This steam gives up heat to thepiston head so that the steam entering the cylinder meets apiston surface that is warm while the head and walls are heated 228 HEAT ENGINEERING to the temperature of the incoming steam on one side and to atemperature higher than this by the superheated steam on theother side. The part of the cylinder near the center which is in0 contact with the low pres- sure or exhaust steam iscut off by the piston fromcontact with the fresh curves of Fig. 105 madeby Stumpf show how thewall temperature (a) variesalong the cylinder of a con-densing engine comparedwith the temperature (b) ofthe saturated steam corre-sponding to the pressurewhen the piston is at variouspoints. The fact that themetal line is above the satu-ration line indicates thatsuperheated steam must bepresent and this is only possible on compression. The coolcentral portion of the cylinder is a good feature structurallyfor lubrication as at this location the piston is moving at its. Fig. 105.—Curve showing temperatureof wall and saturated steam for differentpositions of piston as found by Stumpf.
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