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136 



The Florists^ Review 



Apbil 27. 1922 



Greenhouse Heating 



FIGURING BOILER CAPACITY. 



I have a steam tubular boiler, 40-inch 

 shell, twelve feet long, with thirty-six 

 3-inch flues. Can this boiler be used 

 with satisfaction for hot water heating? 

 If so, what is its capacity? I have two 

 houses, 30x150 feet. H. M. B.— 111. 



The boiler is probably rated at thirty- 

 five horsepower and should handle about 

 3,500 feet of hot water radiation in an 

 economical manner. For the best re- 

 sults it should have four 4-inch flow 

 pipes and four main return openings of 

 the same size. 



The amount of the glass in the walls 

 of the houses is not given, nor is any 

 mention made of the temperature de- 

 sired, but if there is not more than two 

 feet of glass in each of the four side 

 walls of the houses, and they are well 

 built, it should be possible to keep one 

 house at 60 degrees and the other at 50 

 degrees when it is 10 degrees below 

 zero outside. The grates for the boiler 

 should be 3x4 feet. 



If the houses are built together, with 

 one wall in common, a little extra atten- 

 tion to firing in zero weather will make 

 it possible to keep the temperature at 

 , 60 degrees in both houses. 



HEATING TWO HOUSES. 



I have a heating problem which is 

 giving me a great deal of diflBlculty. The 

 range in question consists of two houses, 

 one 19x100 feet and the other 25x100 

 feet. The boiler used in the heating 

 system is rated at 4,450 square feet of 

 radiation. The chimney of this system 

 has an inside diameter of eighteen 

 inches, is thirty-five feet high and is 

 of brick construction. In spite of the 

 fact that I was led to believe, when 

 purchasing this heating plant, that 1 

 could heat two 25-foot houses to 50 de- 

 grees when the outside temperature is 

 at zero, it has been impossible to 

 raise the temperature of the water in 

 the pipes above 140 degrees. In a trial 

 test recently made the temperature in 

 the 19-foot house remained at 36 de- 

 grees and that in the 2.j foot house 

 could not be forced above 45 degrees. 

 Can you tell me wherein the trouble 

 lies? I should like to obtain .lO degrees 

 when the outside temperature goes to 

 zero. J- C- ^^• 



From the sketch which accompanied 

 the inquiry, it is learned that the boiler 

 has a grate 30x65 inches and that the 

 top of the boiler is two feet below the 

 floor of the greenhouses. Four-inch flow 

 and return pipes connect the boiler with 

 the coils. The 19-foot house has ten 

 2-inch return pipes and there arc fifteen 

 returns in the 25-foot house. The south 

 house has four feet of glass in the south 

 wall, while the north house has three 

 feet of glass in the north wall. The 

 exjjansion tank is attached at the 

 farther end of the houses, from which it 

 is inferred that the flow pipes rise to 

 that point and from there fall towards 

 the coils and thence back to the bpiler. 



While the arrangement of your piping 

 could be greatly improved by us- 

 ing two extra returns in the 19-foot 

 house, it is impossible to understand 

 why the results you have obtained are 

 so unsatisfactory. The houses require 

 only 1,500 square feet of hot water 



''The Boiler of Unequaled Fuel Economy" 



■ 

 8 



The Kroeschell Hot Water Boiler with 

 its thin waterways in which the water 

 movement is upward, the natural way, 

 giving rapid circulation, is the key to 

 real fuel economy. It is easy to main- 

 tain high temperature in your heating 

 lines with a Kroeschell. 



Orders may be placed now for delivery 

 during summer or fall of 1922. You 

 can save 5 to 10 per cent if you purchase 

 a boiler during this month. It will pay 

 you to take advantage of this offer. 



WHEN YOU BUY- 

 GKT A KROKSCHELL 



IT SAVES 

 COAL and LABOR 



Encinecring Advice and Quota- 

 tions cheerfully submitted— 

 Let us know your requirements 



KROESCHELL BROS. CO., 



444 W. Eritt Street 



CHICAGO, ILL. 



