126 



The Florists^ Review 



Febbdabt 26. 1920 



Greenhouse Heating 



SASH HOUSE IN CANADA. 



My house is 12^x60 feet and is made 

 cf sashes. It is seven feet from floor 

 to ridge. It lies at the east side of 

 another house. The walls are four feet 

 high; the east side has eighteen inches 

 of glass, the north end adjoins the 

 boiler pit and working room and the 

 south end is glass. I have a S-section, 

 round boiler rated at 1,100 feet of radia- 

 tion; its top is about eight inches be- 

 low the greenhouse floor. The smoke 

 fltie has an 8-inch grade and a 22-ineh 

 diameter. The boiler has two 2%-inch 

 outlets and two 2% -inch inlets. I wish 

 to keep the house about 40 to 45 degreea 

 when it is 30 degrees below outside. 

 How should I arrange the heating for 

 this house f 



Please tell me also how I should take 

 off the flows from the boiler so as to 

 heat the next house, which I intend to 

 pipe later on. This house is 17^x60 

 feet, eight and a half feet from floor 

 to ridge and of the three-quarter-span 

 tjpe of construction. Its walls are all 

 good. I should want to keep it at 

 about the same temperature as the first 

 house, using both of them for the grow- 

 ing of plants. I have 480 feet of 1%- 

 inch pipe and 150 feet of 2-inch pipo OB 

 hand. A. P.— Cim. 



One 2%-inch supply pipe will answer 

 for the narrow house, but a somewhat 

 larger pipe should be used to supply the 

 wider one. However, since the now and 

 return outlets are only 2%-inch, it will 

 answer if 2V^-inch connections are 

 made with the boiler and 2-inch pipee 

 are taken off as soon as possible to 

 serve as flows and returns on the east 

 side of the 17yi.-foot house. 



Run a 2-inch flow pipe on each side 

 plate of the narrow house and at the 

 farther end connect each of these flow 

 pipes with a return coil under the side 

 benches. Five 1%-inch returns will be 

 required on the side where the wall is 

 exposed and four returns on the other. 



In the 17%-foot house, after taking 

 off a 2-inch flow pipe for the plate on 

 the east side, carry the 2%-inch flow 

 to a point opposite and about two feet 

 below the ridge. There take off another 

 flow and continue the main flow as a 

 2-inch pipe to the west wall plate, 

 where it should be continued to the 

 farther end of this house. This will 

 provide three 2-inch flow pipes. Con- 

 nect each flow with a coir of 1%-inch 

 return pipes, using four returns in the 

 west coil and three in each of the 

 others, unless the house is in an ex- 

 posed location, when it will be well 

 to run four pipes in the center coil. 



NUMBER OF FLOWS. 



We are erecting three short-span 

 houses of the A. Dietsch Co., as shown 

 in the sketch sent you, and should ap- 

 preciate some information regarding the 

 heating system and arrangement of 

 pipe, so that we may maintain a night 

 temperature of 60 degrees. 



The houses will be 14%x225 and will 

 be eight feet to the gutter, with six feet 

 of glass in each wall. The houses are 

 connected and there are solid benches 

 throughout. We intend using 2-inch 

 pipe. How many runs of pipe will it 

 take and where will they be best placed 



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