124 



The Florists' Review 



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Dbcbubbb 4. 1919. 



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 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 greenhouses. It is often help- 

 ful also to have a sketch showing the 

 location of the houses. 



MAINS IN HOT WATER SYSTEM. 



I am building two houses, 21x75 and 

 25x75, to be heated by hot water. The 

 houses run east and west and are well 



Protected on all sides from the wind, 

 he boiler is a large tubular boiler and 

 has three outlets, one 4-inch, one 3-inch 

 and one 2-inch, and two returns, a 4-inch 

 and a 3-inch. I have on hand about 

 forty feet of 4-inch pipe, 160 feet of 

 8-inch pipe and fifteen feet of 2% -inch 

 pipe. I have also four runs of seventy- 

 five feet each of 2-inch pipe and twenty- 

 six runs of seventy-five feet each of 

 1%-inch pipe. The temperature desired 

 is 55 to 60 degrees and the outside 

 temperature seldom drops below zero 

 for any length of time. I had planned 

 to use the 4-inch pipe for a main flow, 

 feeding two 3-inch pipes which would 

 hang under the ridge in each house. 

 Then on each side wall I had planned 

 to place the 2-inch pipe. Then the 1%- 

 inch pipe was to be used under the 

 benches. I hardly think it will take 

 all the pipe that I have listed above. 



Please tell me how to pipe the houses 

 with the pipe that I have on hand, not 

 using any more than is necessary. I in- 

 tend to build on each side of these houses 

 some day and wish to take that into con- 

 sideration in piping these houses. 



W. G. L.— Colo. 



The sketch accompanying the letter 

 shows that the houses are built side by 

 side and that the wider house has four 

 feet of glass and five feet of siding in 

 the exposed wall. Whether there is 

 glass in the wall of the other house is 

 not indicated. 



The piping on hand will provide about 

 what is required in the way of radiation 

 and the plan suggested for installing the 

 system would in the main be found 

 satisfactory. 



The principal change we advise is in 

 regard to the mains. We should not 

 attempt to beat both houses with a 

 4-inch main, but should use this to sup- 

 ply the larger house. A 3-inch over- 

 head flow pipe will answer fairly well 

 for the smaller house, but will not give 

 the desired results in the house twenty- 

 four feet wide. Run the 4-inch main to 

 where the 3-inch flow would be taken 

 Off and then reduce to 2-inch pipe and 

 run this as a flow on the plate of the 

 outer wall. With this, feed a coil of 

 three 1%-inch pipes placed upon the 

 wall. At the farther end of this house, 

 connect the oveibead 3-inch flow pipe 

 with three coils, each containing three 

 IV^-inch returns, placed under each of 

 the 5-foot benches, and with a eoil of 

 two 2-inch returns on the inner wall of 

 the house. 



While a 3-inch flow pipe connected 

 direetly with the boiler will supply the 



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It will pay you to consider the advantages of KROESCHELL 

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The superiority of our boilers has resulted in the remoyal and 

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KROESCHELL BOILERS have no bulky, soot-accumulating 

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 and forth fire passages. 



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The high safety factor of KROESCHELL BOILERS eliminates 

 the danger of cracking and break-down risks. 



Successful greenhouse owners everywhere insist upon KROE- 

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 —you get better and longer service— you can reduce your heating 

 costs by burning the cheapest grades of soft coal. 



It is a sign of scientific management to own a KROESCHELL 

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The supremacy of KROESCHELL BOILERS 



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