94 



The Florists^ Review 



Mabch 6. 1919 



Greenhouse Heating 



CAN THE BOILER DO MORE? 



The boiler I am using has a firebox 

 4x4 feet and about four and one-half 

 feet high, and contains forty-two 2%- 

 inch flues, ten feet long. At the present 

 time I am heating two houses, each 

 18x100, to 50 degrees; one lean-to 8x100 

 to 50 degrees; one house 14x100 to 50 

 degrees; one house 12x50 to 60 degrees, 

 and one house 8x30, The three largest 

 houses are twelve feet high to the ridge. 

 Should this boiler be able to heat more 

 glass without much forcing? There are 

 two 6-inch flow pipes from the boiler 

 and two 6-inch returns to the boiler. In 

 the houses the flows are 2^-inch and 

 the returns are 2-inch. Zero weather 

 is not unusual here and the mercury has 

 dropped as low as 15 or 20 degrees be- 

 low zero. If the present boiler is used 

 to heat additional space, will more flows 

 from the boiler be needed? 



A. E. S.— Mont. 



The letter does not state whether 

 steam or hot water is used for heating, 

 but from the sizes given for the flows 

 and returns we infer that it is hot water. 



If there is no glass in the side walls, 

 it should be possible to heat the houses 

 described with about 2,000 square feet 

 of radiation. We judge that the boiler 

 is rated at about twenty-five horsepower. 

 At a low estimate, this should heat about 

 3,200 square feet of radiating surface, 

 which would be sufficient for 3,600 

 square feet of glass to be heated to 

 60 degrees, in addition to the present 

 houses. One 6-inch flow pipe and a re- 

 turn of the same size should be able to 

 handle the radiation in the present 

 houses, which would leave a flow and 

 return of the same size for additional 

 houses. To some extent the efficiency 

 of the main flow and return pipes, as 

 well as that of the coils, will depend on 

 the height of the coils above the top of 

 the boiler. 



The number of the flow and return 

 pipes is not given and may be slightly 

 modified according to the kind of pipe 

 on hand, but for heating the two houses 

 18x100 to 50 degrees we would use two 

 214-inch flows and six 2-inch returns. 

 The lean-to house 8x100 we would heat 

 with one 2V(!-inch flow and three 2-inch 

 returns. The house 14x100, to be 

 heated to 50 degrees, should have two 

 2iy4-inch flows and five 2-inch returns. 

 The house 12x50, to be carried at 60 

 degrees, should have two 2%-inch flows 

 and five or six 2-inch returns. In the 

 house 8x30 we would use one 2V^-inch 

 flow and four 2-inch returns. 



COAL MINES CLOSING. 



In its review of the coal situation at 

 the end of February the Coal Age, New 

 York, said: 



"If one wanted a phrase to convey 

 tersely the present status in the coal 

 market, he could do no better than 

 choose the one made famous before our 

 entry into the world war — watchful 

 waiting. Unlike other industries, the 

 coal mines cannot store their product 

 against the time when demand becomes 

 active and an urgent call for fuel is 

 again manifest. If the public does not 

 buy coal, the mines cannot operate. 

 Coal cars on railroad sidings the coun- 

 try over stand loaded with coal, all 

 awaiting a market that is slow to mate- 



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KROESCHELL 



GREENHOUSE SPECIALTIES 



NOT 

 CAST 

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NOT 



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Made in 20 Sixes 



HEATING and COOLING are two branches of engineering on 



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cooling systems for the most successful greenliouse men in this 



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TubelcM Boiler 



KROESCHELL Boilers are making the most wonderf ulgreenhouse 

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13,468,320 sq. ft. of glass was eaulpped with KROESCHELL Boilers 

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 State which is wanted. 



BUY DIRECT-FACTORY TO USER PRICES 



KROESCHELL BROS. CO. 

 KROESCHELL BROS. ICE MACH. CO. 



444 W. Erie Street, 

 CHICAGO, ILL. 



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