118 



The Florists^ Review 



OCTOBBB 7, 1920 



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 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. 



ASPHALTUM ON PIPES. 



"We have about 600 feet of 1^4 -inch 

 pipe which is painted with a rust-re- 

 sisting asphaltum. We plan to use it 

 fdr a rose house and should like to know 

 /'•whether it will hurt the rose bushes. 

 Steam heat is used, L, S. F. C. — 111. 



A good grade of asphaltum paint upon 

 greenhouse pipes should not be injurious 

 to rose plants, especially if the pipes 

 have been used for heating purposes. 

 On the other hand, coal tar cannot be 

 used with safety, even for painting 

 wooden posts for the purpose of preserv- 

 ing them. 



Although the difference is not marked, 

 pipes coated with asphaltum or other 

 paints which give a smooth, glossy sur- 

 face will not radiate as much heat as 

 will those having a rough surface. On 

 this account it is preferable to use a 

 paint composed of lampblack and lin- 

 seed oil. A small amount of white lead 

 may be added to increase its adhesive 

 qualities. 



While a rough pipe will radiate more 

 heat than a smooth one, this does not 

 mean that a pipe covered with a thick 

 coating of rust furnishes a good radiat- 

 ing surface. The rust would really serve 

 to insulate the pipe and reduce radia- 

 tion. 



HEAT HOME FBOM GREENHOUSE. 



My greenhouse is about forty feet 

 from my dwelling house and I wish to 

 heat the latter from the former. Both 

 are equipped for hot water heating and, 

 the greenhouse being lower, there would 

 be sufficient flow. 



The dwelling house has ten rooms, 

 counting a third floor, which I do not 

 heat. What sizes of flow and return 



?ipes should I use from the furnace f 

 f I ran pipes between greenhouse and 

 dwelling through sewer piping with 

 cement^ joints, would there be much 

 loss of heatf Is the scheme practicable f 



H. E. C— O. 



The suggested plan for heating the 

 dwelling is entirely feasible, provided 

 the boiler is of sufficient capacity and 

 the main pipes and radiating surfaces 

 are properly adjusted. 



In order to make an accurate estimate 

 of the amount of radiation and the size 

 of the mains, it is necessary to know 

 not only the number of the rooms, but 

 the size, including the height, the 

 amount of exposed wall surface, the 

 number and sizes of the windows, and 

 the materials a^d construction used 

 in the walls. 



However, it is hardly possible that the 

 radiation required in the house will 

 average less than sixty square feet 

 per room and for a house with 600 square 

 feet of radiation it would be well to 



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• 



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 CHICAGO, ILL. 



