102 



The Florists' Review 



Mai 8, 1919. 



Greenhoose Healinfl 



SuBSCEiBEBS are invited to write the 

 Editor of this Department with re^rd 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 gn^eenhouses. It is often help- 

 ful, also, to have a sketch showing the 

 location of the houses. 



DESIEES HIGH TEMPEBATUBE. 



I would like to know what size of 

 boiler will be required to heat three 

 greenhouses, each 21x76, and the size 

 and number of pipes necessary to heat to 

 80 degrees. These houses have concrete 

 walls and glass, 12x24, underneath the 

 gutters. The height of the side walls is 

 four feet. The ridge is ten feet high 

 and all three houses have glass on both 

 ends. At present I am using flues to 

 heat. F. F. S— Pa. 



As a rule, in arranging the radiation 

 for greenhouses, the minimum night 

 temperature that must be maintained in 

 the most severe weather is provided for. 

 In ordinary winter weather this radia- 

 tion will provide a temperature at least 

 10 degrees higher at night, and a still 

 higher day temperature will be avail- 

 able, even in severe weather. 



In a great many houses a tempera- 

 ture of 60 degrees is taken as a mini- 

 mum, while in a still greater number a 

 temperature of 50 degrees is all that is 

 considered necessary. Seldom is a tem- 

 perature of 80 degrees required in com- 

 mercial houses. To maintain that tem- 

 perature, the radiation must be double 

 that required for one of 50 degrees. 



If the three houses described have 

 both side walls exposed, with twenty- 

 four inches of glass, about 1,800 feet of 

 radiation will be needed. While it 

 would be possible to heat these houses 

 to 80 degrees with a 30-horsepower 

 boiler, it will effect a saving of both 

 fuel and labor if a 40-horsepower boiler 

 is used. 



The number of flow and return pipes 

 will depend upon the sizes selected. 

 Thus, either one 2i^-inch flow pipe or 

 three 1%-inch flows may be used. If 

 one flow is used, it should be two or 

 three feet below the ridge, while with 

 three flows, one should be on each plate 

 and the other in the middle of the house, 

 under the ridge. 



Either eighteen 1-inch or fifteen 1^4- 

 inch pipes may be used for the coils, 

 placing one-third of the pipes on each 

 wall, or under the side benches, and the 

 remainder under the middle bench. 



For a temperature of 70 degrees the 

 number of returns of the size named 

 would be fifteen and twelve, respec- 

 tively, while for one of 60 degrees it 

 would be twelve and ten, in the same 

 way. Each coil should be joined to one 

 of the flow pipes, if three are used, or 

 to one of three branches taken off the 

 214-inch flow pipe. 



□■□■OHaa 



KROESCHELL HEATING SYSTEMS 



KROElcHEr"?" R establishments in this country are eauipped with 



Centralize your heat supply and save 

 the expense of needless fuel and labor. 













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K.B CO. 



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NOT 

 CAST 

 IRON 



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■ XNGINKKRIMO ADVICC 



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Eiisii{=:H-SES5S"""-' 



experience 

 heatinft plants, no matter 



USE FLOW PIPES AND COILS. 



I shall be greatly obliged if you will 

 let me know whether a jacket heater 

 rated to heat 110 gallons will heat a 

 small greenhouse which I am building. 

 The heater has three li^-inch outlets. 



The KROESCHELL System will put hish 

 temperatures into your heating lines. 



■ KROESCHELL BROS. CO., ^^t^dSSAS.'T 



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