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116 



The Florists' Review 



June 1, 1922 



Greenhouse Heating 



Subscribers are invited to write the 

 editor of this department with regard to 

 any details of greenhouse heating that are 

 not understood. When information is de- 

 sired regarding the capacity of boilers, or 

 the amount of radiation required for a 

 greenhouse, the needed temperatures 

 should be stated in the inquiry, as well 

 as the amount of glass in the side walls, 

 and the dimensions and general arrange- 

 ment of the greenhouses. It is often help- 

 ful, also, to have a sketch showing the 

 location of the houses. 



FOB HIOH-FBESSUBE STEAM. 



We are completing a greenhouse, 20x 

 350 feet, with solid benches for carna- 

 tions. The heating system will consist 

 of a high-pressure steam boiler, cen- 

 trally located. What size of flow and re- 

 turn pipes and how many -will be needed! 

 The minimum temperature to be main- 

 tained will be 60 degrees in a climate 

 similar to that of Chicago and vicinity. 



B. F. L. — Can. 



For a house 20x350 feet it would be 

 advisable to use one 3-inch main flow 

 pipe. From the description, it is under- 

 stood that the boiler will be located op- 

 posite the middle of the house. The 

 main flow pipe should be divided at 

 that point and a 2%-inch flow pipe car- 

 ried in each direction to the ends of the 

 house, where they should be connected 

 with the coils. The coils should be 

 located on the sides of the walls. If 

 more convenient, two 2-inch flows may 

 be substituted for each of the 2%-inch 

 flows. These may be carried either on 

 the side wall plates or on the purlin 

 posts. The pipes for the coils should 

 be 114-inch, and the number will de- 

 pend upon the amount of glass in the 

 walls and the construction of the house. 

 A well built house without glass in the 

 walls will require three pipes in each 

 coil, but for two and one half or three 

 feet of glass in each end wall an addi- 

 tional return pipe will be required on 

 each wall. If the end of the house is 

 much exposed it will be advisable to 

 start the coils on the end of the house 

 five or six feet from each corner. E. 



HEATING TWO HOUSES, 



We have erected two connecting 

 greenhouses IS^^xlOO feet and will use 

 a Lord & Burnham soft coal boiler with 

 a fire box 24x38 inches. We are getting 

 3,000 feet of 2-inch, 400 feet of 3-inch 

 and 5-inch pipe for flows and returns. 

 What is the proper way to arrange these 

 pipes in order to secure the best re- 

 sults! T. B. G.— Pa. 



The sketch shows that each of the 

 houses has one side wall exposed, con- 

 taining thirty inches of glass and thirty 

 inches of concrete. The temperature de- 

 sired is 55 to 60 degrees. Each house 

 has two side benches, with a solid bed 

 in the center. 



From the size of pipe ordered, it is 

 inferred that the idea is to use 3-inch 

 flows and 2-inch returns, which will be 

 all right. 



For each house it will be advisable to 

 use two 3-inch flow pipes, placing them 

 on the side wall plates and giving them 

 a slight downward slope. At the farther 

 end of the houses connect each flow pipe 

 with a coil of five 2-inch returns on the 



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