124 



The Florists^ Review 



NOVBMBEB 20. 1919. 



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. 



HEATING A FLORIST'S BEDBOOM. 



Will you tell me the best way to ar- 

 range the coils in a bedroom which I 

 intend to heat with steam? The room is 

 9x12, with a height of eight feet to the 

 ceiling, and is lighted by two windows. 

 I have a lot of iy2-inch pipe and ells 

 which I wish to use. G. S. — N. J. 



In order to make an accurate estimate 

 of the number of square feet of radia- 

 tion required for heating a sleeping 

 room, it is necessary to know the area 

 of the glass in the windows, the amount 

 of exposed wall surface and the temper- 

 ature to be maintained. 



If the room described does not have 

 more than twenty square feet of glass 

 and has only two of its walls exposed, 

 about thirty square feet of radiation 

 will be required to maintain a temper- 

 ature of 60 degrees in zero weather. 

 This will be furnished by sixty linear 

 feet of iy2-inch pipe. We would sug- 

 gest that a flow pipe be run around 

 three sides of the room, with the return 

 pipe underneath. While we would pre- 

 fer to connect both flow and return 

 directly with the boiler, it will answer 

 if they are joined to a iy2-inch pipe 

 running to the boiler or to the main. 



HEATING WITH TWO BOILEBS. 



We have a greenhouse which has no 

 protection except from the east side, 

 where we propose building a potting 

 shed right away. We have purchased 

 two upright steam boilers of ten and 

 twelve horsepower respectively. One 

 has a steam outlet of one and a half 

 inches and the other of one and a quar- 

 ter inches. We propose to bring these 

 up to two inches just after they leave 

 the boilers and cross-connect them. We 

 want to maintain 60 degrees with an 

 outside temperature of 30 degrees be- 

 low zero. We have thought of running 

 a main overhead on the supports, tak- 

 ing ofE drops of one inch and returns 

 running back to the boiler. The water 

 line in the boilers will be about twelve 

 inches below the level of the greenhouse 

 floor. Is this sufficient to prevent the 

 water from backing up? We are per- 

 mitted to carry a pressure of ten pounds 

 without a certified engineer and we 

 wish to use that pressure if it is suf- 

 ficient to get the required radiation. 



E. B. — Can. 



From the sketch which accompanies 

 the inquiry we learn that the house is 

 even-span, with sashbars thirteen and 

 a half feet in length, and that the south 

 and east walls have two feet of glass, 

 but whether there is glass in the north 

 and west walls is not shown. The length 

 of the house is not stated, and hence 



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