114 



The Florists' Review 



Juki 10, 1»90. 



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 arraiige- 

 ment of the greenhouses. It is often help- 

 ful, also, to have a sketch showing the 

 location of the houses. 



CAPACITY or 40-H. P. BOH^B. 



My present boiler, 40-hor8epower, 

 heats two houses to carnation tempera- 

 ture and two to lettuce temperature. 

 The four houses are each 26x100 feet 

 and are attached. Each has two lines of 

 2-inch pipe and 6 lines of 1%-inch pipe. 

 Will the same boiler carry another house, 

 26x100 feet, heated to lettuce tempera- 

 ture t The mercury seldom goes below 

 zero here. The new house would have 

 two flows of 2-inch pipe and two coils 

 each of three lines of l^i-inch pipe. 



What horsepower of boiler would be 

 required to heat my present range of 

 houses, as described, and two additional 

 houses, each 26x100 feet, piped as are 

 the present houses f 



R. E. M.— Okla. 



When a boiler and the piping are 

 properly installed and the chimney is of 

 suitable size and height, it is customary 

 to reckon that it is possible to heat 

 100 square feet of steam radiation for 

 each horsepower of the boiler, but for 

 boilers of less than 100 horsepower it is 

 safer to make a reduction of at least 

 twenty-five per cent from this ratio. On 

 this basis the 40-horsepower boiler would 

 take care of 3,000 square feet of radia- 

 tion, including the mains. 



Without knowing just how the coils 

 and connecting pipes are arranged, it 

 could be estimated that two 2-inch flow 

 pipes and six IVi-inch returns in a house 

 26x100 feet would supply 375 to 400 

 square feet of radiation. If the houses 

 are well built and the glazing is tight, 

 this should be ample for maintaining a 

 temperature for carnations, unless there 

 is glass in the exposed walls. 



From the above it might be seen that 

 it should be possible to heat not only 

 five or six 26xl00-foot houses for 

 carnations and lettuce, but that, under 

 favorable conditions, seven or even 

 eight houses of this size might be heated 

 by means of a 40-horsepower boiler in 

 a climate where the mercury occasional- 

 ly drops to 10 or 15 degrees below zero. 



I should think it safe to add two more 

 houses, making six in all, but do not 

 feel like advising a larger number with- 

 out knowdng more regarding the con- 

 struction and arrangement of the houses. 

 One should be able to judge fairly ac- 

 curately of the reserve power in the 

 boiler. 



HEAT FOR PIT. 



I intend to make a sunken pit five 

 feet deep in which to grow rooted shrub- 

 bery, rose, cafnation and geranium cut- 

 tings. I plan to erect a shed over a 

 basement at the north side, to rise 

 twelve feet above the level of the 

 sashes on the pit. In the center of this 



CHICAGO'S LEADING 



PLANT ESTABLISHMENT 



THE FAMOUS OECHSLIN PLANT. 

 100,000 SQ. FT. OF GLASS-HEATED BY KROESCHELL BOILERS. 



ROT 

 CAST 

 IROR 



Mr. Oechslin's greenhousM are the show place of Chicaso. and visitors are 

 always welcome. Go and see this wonderful range and when you admire 

 the perfection of the plants and the cleanliness of the place, remember to 

 visit the boiler rooms and note that the name KROESCHELL is found on 

 every one of the boilers. 



WHKN YOU BUY- 

 QET A KPOKSCHILL 



THK KROKSCHKLL 

 SAVES COAL AND LABOR 



OECHSLIN'S FINE PLANTS AT NATIONAL FLOWER SHOW. 



KROESCHELL BROS. CO., ^'i.rc/.^i.'.VLr 



