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122 



The Florists^ Review 



Fkbbdaby 19. 1920 



Greenhouse Heating 



SIZE OF BOILEB. 



We have just erected a greenhouse, 

 16x100 feet and seven feet high at the 

 ridge, for which we need a hot water 

 boiler. There are three feet of con- 

 crete in the side walls. The length of 

 the sashbars is nine feet. We have 200 

 feet of 3-inch pipe, which we wish to 

 use for flow pipes under the ridge, and 

 four lines of 3-inch cast-iron pipe to go 

 under the side benehesj two on each 

 side. How large a boiler would be need- 

 ed to heat the house to 60 degrees in 

 zero weather? The house was formerly 

 part of a range of twelve houses and 

 gave good service with the pipes ar- 

 ranged as we have them. 



L. S.— N. Y. 



To heat the house described, it would 

 be desirable to use a boiler rated for 

 about 800 square feet of hot water ra- 

 diation, or about 900 square feet if soft 

 coal is to be used. This will require 

 a grate of twenty-four or twenty-five 

 inches in diameter. The radiation 

 would perhaps be a little more effec- 

 tually distributed if the flow pipes 

 were carried at the purlins rather than 

 under the ridge. 



USING OLD EQXTIFMENT.- 



I have purchased two greenhouses, 

 sketches of which I am sending, and in- 

 tend to rebuild them. The heating ar- 

 rangements were not good, the boUer 

 being too small. I should like to use 

 the same material that was in the old 

 arrangement. Could you tell me the 

 best system of heating and how large 

 a boUer for the hot water system is 

 needed to keep a temperature of 60 de- 

 grees in zero weather t I shall erect 

 the boiler house at the north end of the 

 houses. The sides will be boarded dou- 

 ble, with air space between, up to the 

 6aves. The houses are 15x90 and ten 

 feet high. There are three solid benches, 

 with two. paths eighteen inches wide. 



A. G. — Can. 



The houses will each require about 

 600 square feet of radiation and it would 

 be advisable to use a boiler rated for 

 about 1,500 square feet. This will re- 

 quire a grate about thirty inches in 

 diameter or 28x32 inches. 



The greater part of the pipe on hand 

 is either 1-inch or 1%-inch in diameter. 

 This is too small for' use with hot water 

 heat in a house ninety feet in length, al- 

 though the 246 feet of 1 14-inch pipe 

 may be used. The fifty feet of 4-inch 

 pipe and the fifty feet of 3-inch pipe 

 may be used for the flow and return 

 pipes leading to the houses. It is al- 

 ways well to have the returns of the 

 same size as the flow pipes. 



It would be best to run a 2V^-inch 

 pipe as a flow upon each purlin. This 

 wUl require about ninety feet for each 

 house, making it necessary to purchase 

 about 250 feet of this size. For returns 

 it would be best to use three 2-inch 

 pipes on each side wall and one 2-inch 

 return in each walk. The 246 linear 

 feet of 1^-inch pipe may be used on 

 one of the walls, forming three runs, 

 which may be substituted for two runs 

 of 2-inch pipe. By getting twenty feet 

 more of 1^-inch pipe, there wUl be 

 enough for one run, which may be used 

 in place of one of the 2-inch returns, 



• OBaaDBaHaBDBaB DBOBDBaBDBDB 



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