124 



The Florists^ Review 



NoramiB 11. IMO 



Greenhouse Heating 



SuBSORiBiBS are inrited to write the 

 editor of thia department with reg^ard 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 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. 



INSUI.ATE THEEITT FEET. 



I am installing a Oiblin No. 70 hot 

 water boiler for my four greenhouses, 

 20x150 feet. Instead of putting up a 

 building next to the greenhouses for 

 the boiler, I intend to put the boiler in 

 the basement of my residence, which is 

 about thirty feet from greenhouse No. 

 1. The floor of the basement is five 

 feet below the floors of the greenhouses. 

 The top of the boiler is on a level with 

 the floor of the greenhouses. Can I 

 run a pipe from the boiler on a level 

 with the ground outside to the nearest 

 greenhouse, and then elevate the pipe 

 and run it on a slope to the end of the 

 greenhouses and bring the returns back 

 underground to the boiler, boxing both 

 pipes with asbestos to keep in the heatt 

 What would you suggest t 



G. F. M.— Cal. 



There should be no difficulty in run- 

 ning the flow pipe as outlined above. 

 Unless it is possible to locate the ex- 

 pansion tank in the greenhouse above 

 the highest point in the flow pipe, an 

 air valve will be necessary. The ex- 

 pansion tank may then be connected 

 with the flow pipe before it is carried 

 outside of the basement. It should, of 

 course, be located at a level higher than 

 the highest point in the system. If the 

 flow and return pipes are properly in- 

 sulated, the loss of heat between the 

 residence and the greenhouses will be 

 negligible. 



HEATING WITH STEAM. 



I am sending sketch of my two green- 

 houses. What would be the best way 

 to run the pipes in them? I have an 

 American Badiator Co. steam boiler No. 

 207, rated at 2,000 feet, which is also 

 used to heat my residence. Also advise 

 as to the proper size of pipe. I have 

 a quantity of 1%-inch pipe on hand, 

 which I should like to use as far as pos- 

 sible. I wish to maintain i temperature 

 of about 60 degrees in both houses. 

 H. E. v.— Mich. 



From the sketch it appears that there 

 are two connected houses, each 13%x40, 

 with sixteen inches of glass in the side 

 walls. While it would be preferable to 

 use 1%-inch or 2-inch pipe for the flows 

 in both houses and 1%-inch or 1-inch 

 pipe for the returns, it will be satisfac- 

 tory if 1%-inch pipes are used for both 

 flows and returns. 



For 60 degrees it will be necessary 

 to use one 1%-inch flow pipe and either 

 five 1%-inch, six 1%-inch or eight 1- 

 inch returns in each house. 



It is stated that one house has raised 

 benches and I infer that the other 

 house has solid beds. The flow pipes 

 should be one foot below the ridges and 



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