114 



The Florists^ Review 



DiCEUBBB 25, 1919. 



-V 



Greenhouse Heating 



BuBSCBiBKBS are invited to write the 

 editor of this department with regard to 

 any details of greenhouse heating that 

 are not understood. When information 

 is desired regarding the capacity of boil- 

 ers, or the amount of radiation required 

 for a greenhouse, the needed temperatures 

 should be stated in the inquiry, as well 

 as thd 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. 



FIVE NEW, CONNECTED HOUSES. 



We have just built five connected 

 greenhouses, each 25x150, with a height 

 of seven feet to the gutters. We wish 

 to maintain a temperature of 60 degrees 

 in zero weather, using a steam boiler. 

 We have plenty of 2-inch and 3-inch 

 pipe, and we wish to use 3-inch pipe 

 for the main and 2-inch for the flows 

 and returns. How many coils will be 

 needed and how many pipes in each 

 coil! G. W. R.— Can. 



Although it is stated that a steam 

 boiler is to be used for heating the 

 houses, from the fact that the coils are 

 to be of 2-inch pipe we are not sure that 

 hot water will not be the heating me- 

 dium. With hot water we would use 

 three 3 -inch flow pipes in each of the 

 houses, with nine 2-inch returns in the 

 inside houses and ten in those which 

 have one outer wall exposed. If there 

 is more than two feet of glass in these 

 walls, an additional return should be 

 put in. If the houses are to be heated 

 with steam, we would use one 3-inch flow 

 pipe and seven 2-inch returns, with one 

 Additional return in the houses with one 

 exposed wall. The coils may be either 

 tinder the benches, on the walls or on 

 the supporting pipes over the benches. 



STEAM FOR A 200-FOOT HOUSE. 



What size of steam boiler, as indi- 

 cated in horsepower, would be required 

 to heat an even-span greenhouse, 33x200 

 and seven feet high to the eaves, main- 

 taining a temperature of 50 degrees in 

 aero weather! How many runs of pipe 

 will be needed! Could 2-inch pipe be 

 used for part of the system! We under- 

 stand that in the state of Ohio a licensed 

 fireman must be employed for a boiler 

 of over thirty horsepower. Is this cor- 

 rect! F. & S.— O. 



While a considerably smaller boiler 

 would answer, we would advise the use 

 of a boiler of about twenty-five horse- 

 power. In case one or more houses are 

 to be added, it would be well to provide 

 boiler capacity for any likely to be 

 erected during the next two or three 

 years. For two houses use a BO-horse- 

 power boiler and allow about the same 

 amount of added horsepower for each 

 additional house. 



Two-inch pipes will answer well as 

 flow pipes in the houses, but it will be 

 better to use 1%-inch pipes as returns. 

 We would suggest the use of three 2- 

 inch flows and ten 1^/4 -inch returns, 

 provided each side wall contains four 

 feet of glass. If there is more or less 

 than four feet of glass, use one return 

 more or less, accordingly, for each four 

 feet of glass. 



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^^A Merry Christmas 



and a Happy New Year^' 



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|HE spirit of the sea- 

 son prompts us to 

 express to you ap- 

 preciation of our pleasant 

 business relations during 

 the past year and to most 

 heartily wish you health 

 and prosperity for the com- 

 ing year. 



KROESCHELL BROS. CO. 



444 West Erie Street 

 CHICAGO 



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