116 



The Florists^ Review 



June 24, 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 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. 



BOILER OF AMPLE SIZE. 



I have a greenhouse, 21x50 feet, 

 which I am going to lengthen to sev- 

 enty-five feet. The house has three feet 

 of cypress in the side walls and three 

 feet of glass, with the north end en- 

 tirely closed. At present I am using a 

 Wilks hot water boiler, 24x36 inches, 

 but when I complete the extension I 

 shall have fourteen lines of 2-inch re- 

 turns supplied by two 2-inch feed pipes. 

 Is the boiler I am now using large 

 enough to heat this house to 50 or 55 

 degrees at zero temperature? Should I 

 have larger feed pipes? 



W. T. B.— N. C. 



The boiler is of ample size and there 

 should be no difficulty in maintaining a 

 temperature of 60 degrees when it is 10 

 degrees below zero, if the radiation is 

 properly arranged. 



The letter does not state whether the 

 boiler is below the level of the returns, 

 but if such is the case the radiation sug- 

 gested is considerably more than is re- 

 quired for 50 to 55 degrees. But I should 

 increase either the number or the size 

 of the flow pipes. Instead of fourteen 

 2-inch return pipes it will only be neces- 

 sary to use nine 2-ineh returns, provided 

 three 2-inch flow pipes are used and the 

 returns are above the top of the boiler. 

 Kun the flow pipes dovsmhill and con- 

 nect the highest part of each flow with 

 the expansion pipe. If the returns are 

 lower than the top of the boiler, it will 

 be advisable to use a mercury circulator. 



BOILER IN BESIDENCE. 



I intend to build a greenhouse 21x40 

 feet, at the southwest corner of my 

 residence, as shown on the plans I am 

 sending you. The side walls will have 

 three feet of board with insulating 

 paper and three feet of glas^. The ends 

 will be three feet of board and the rest 

 of glass. Ten and a half feet of the 

 east end will be exposed and twenty- 

 eight feet of the north wall. Eight feet 

 of the north wall, next to the house, 

 will have regular siding, with one door, 

 and a glass panel. The remaining 

 twenty feet of the exposed part of the 

 north wall will be wood and glass. The 

 entire south slope of roof and twenty 

 feet of the north slope will be glass; the 

 eight feet over the office next to the 

 house will have regular roofing. The 

 boiler for a hot water system is in the 

 basement of the house, set close to the 

 chimney. The basement floor is three 

 feet below the surface of the ground. 

 There is an 8-inch square flue, which 

 clears all buildings and trees. I intend 

 to build with the idea of adding another 

 unit, 21x40 feet, at the south side next 

 year. The most convenient location for 



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Plants 



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