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118 



The Florists' Review 



September 9. 1920 



Greenhouse Heating 



HABD COAL SCBEENINQS. 



We have the opportunity to secure 

 a large quantity of hard coal screenings 

 at $2 per ton delivered, but, as we have 

 always used only three-quarter-lump soft 

 coal, we should like some positive in- 

 formation regarding the comparatrv©^ 

 values of the two fuels, also inforjjlation i 

 regarding the best method of firing 

 with the screenings. The suggestion 

 was made that the two fuels be kept 

 separate and some screenings thrown 

 onto the fire after the soft coal was half 

 consumed. Our impression is that the 

 fuels would burn more satisfactorily 

 if thoroughly mixed. 



L. C. S. & S.— N. Y. 



The value of the hard coal screenings 

 will depend considerably upon the 

 method of firing. With a good draft 

 and frequent attention they would be 

 an excellent fuel at the price mentioned. 

 They could be mixed with the lump soft 

 coal, or after a good fire has been 

 started with the soft coal, a thin layer 

 could be spread over the surface and 

 additional layers could be added as 

 needed. The screenings also could be 

 ^used for banking the fire in mild 

 weather, while a night fireman could 

 use them to good advantage in severe 

 weather. 



'^ 



NEED I.AIIOEB BOILER. 



I am sending, you a drawing of my 

 greenhouses and wish you would let me 

 know what is wrong. Have I enough 

 pipe and a large enough boiler? I have 

 a 7-section hot water boiler, rated for 

 1,350 square feet of radiation. When 

 it is zero weather the most heat that it 

 gives is 40 degrees. I must have 55 or 

 60 degrees in zero weather. The lower 

 ends of the coils are three feet from 

 the boiler room floor. L. S. — Pa. 



The sketch shows two greenhouses, 

 18x75 feet, with one foot of glass for 

 fifty feet of the south wall of the south 

 house; the remainder of the south wall 

 is boards. The walls are four feet high. 



One of the houses has a 3-inch feed 

 pipe, presumably overhead, with ten 

 li/^-inch returns. The other house has 

 one 2-inch flow pipe on one side and five 

 1%-inch returns on the other side of the 

 house. The total amount of radiating 

 surface is 1,000 linear feet of 1^^-inch 

 pipe in the coils, amounting to 500 

 square feet; eighty linear feet of 3-inch 

 flow pipe, giving about seventy-five 

 square feet of radiation inside the 

 greenhouses, and about 160 feet of 2- 

 inch pipe, with 100 square feet of ra- 

 diation. This gives a total of 675 

 square feet of radiation, of which 

 about 420 square feet is in one of 

 the houses. As shown by the sketch, 

 the amount of glass to be heated is 

 3,250 square feet. To heat this area of 

 glass to 60 degrees in zero weather, you 

 should have nearly 1,100 square feet of 

 radiation and you should not expect 

 more than 40 degrees when 675 square 

 feet of radiation is furnished. 



From the arrangement of the piping 

 I infer that the coil on the south side 

 of the north house is expected to heat 

 the north side of the south house. While 

 the rating of the boiler would indicate 

 that it is suflSciently large to supply 

 1,100 square feet of radiation, you 



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TO THE MAN WHO NEEDS A BOILER 



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WHEN YOU BUY-OET A KROESCHELL 



KROESCHELL BROS. CO, 



444 W. Erie Street 

 CHICAGO, ILL. 



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