Greenhouses, their construction and equipment . various conditions. Difference in temperature on leaving andentering boiler10° 15° 20° 30° 40° Feet Per Arrangement of Piping.—There are twoapproved methods of arranging the pipingfor hot-water heating. One is known as thedown hill; the other as the up hill. In theformer the highest point in the system isdirectly above the boiler. In the latter thehighest point is at the end of the systemfarthest from the boiler. Either is satisfac-tory and is preferred to the level systemsometime
Greenhouses, their construction and equipment . various conditions. Difference in temperature on leaving andentering boiler10° 15° 20° 30° 40° Feet Per Arrangement of Piping.—There are twoapproved methods of arranging the pipingfor hot-water heating. One is known as thedown hill; the other as the up hill. In theformer the highest point in the system isdirectly above the boiler. In the latter thehighest point is at the end of the systemfarthest from the boiler. Either is satisfac-tory and is preferred to the level systemsometimes advocated. In either the down Height Difi of Column 5° 5 ft. 10 20 30 170 GREENHOUSES hill or the up hill system the air whichcollects in the pipes will eventually reach thehighest point when it may be allowed toescape through an automatic air valve. Inthe level system slight sags and raises arelikely to occur and the air will collect in thehigher parts and cause Fig. 92.—Diagram showing down-hiU and up-hill systems of piping. A, boiler; B, flow pipe;C, C, headers; D, radiating pipes or coils; E, re-turn pipe; F, automatic air valve; x indicatesheight of water column The author prefers the down hilF systemwhen the flow pipes are carried in the upperpart of the house and the coils are consider-ably lower. When all the pipes must be inthe lower part of the house, or under thebenches, he prefers the up hill system. The HOT WATER INSTALLATION 171
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