156 



The Florists^ Review 



Mat 4, 1922 



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 de- 

 sired 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 arrange- 

 ment of the greenhouses. It is often help- 

 ful, also, to have a sketch showing the 

 location of the houses. 



USINO OLD BOILER. 



A few years ago we picked up a boiler, 

 thinking that it might be serviceable in 

 a greenhouse we were then thinking of 

 erecting. We are now building that 

 greenhouse, which is 30x100 feet. The 

 boiler is eight feet in length and has a 

 diameter of three feet. There are 

 twenty-eight 3-inch flues, together with 

 a 4-inch outlet and a 2y2-inch return 

 connection. Is it possible to heat the 

 above-mentioned greenhouse with this 

 boiler if hot water is used, or would it 

 be more advisable to use steam? 



T. H. G.— Colo. 



No reference is made to the amount of 

 glass in the side walls, or to the temper- 

 ature desired in the greenhouse, but if 

 there are not more than thirty inches of 

 glass in each of the side walls of the 

 greenhouse, and if the temperature dj 

 sired does not exceed 60 degrees when 

 the outside temperature is 10 degrees 

 below zero, the boiler will meet the re- 

 quirements. The boiler must have a 

 grate thirty inches square, however. 



For heating a house 30x100 feet, it is 

 advisable to use hot water. The only 

 objection to the boiler now on hand is, 

 that the inlet and outlet on it are too 

 small. An additional 3-inch outlet 

 should be provided. You should either 

 provide the boiler with two 3-inch inlets, 

 or one i-inch in addition to the 2%-inch 

 inlet which the boiler now contains. 



The piping arrangement in the green- 

 house should include five 2%-inch flow 

 pipes; one of these should be located on 

 each side wall plate, one under the ridge 

 and the fourth and fifth at the purlins. 

 Fifteen 2-inch return pipes will be re- 

 quired, if there are two feet of glass in 

 the side walls of the greenhouse. If 

 there is no glass in the side walls, how- 

 ever, thirteen returns will suflSce. Ar- 

 range the returns in five coils, and sup- 

 ply each coil from one of the flow pipes. 



HOLDING TWO TEMPERATURES. 



I have a greenhouse under construc- 

 tion, which is 20x40 feet, with forty-five 

 inches of glass in the side walls. The 

 ridge is twelve feet high. I intend to 

 pipe this greenhouse with one 3%-inch 

 flow and one 3%-inch return. The main 

 flow is to be a 2%-inch pipe. I intended 

 to use sixteen runs of 2-inch pipe under 

 the benches, three runs under each side 

 bench and five runs under each center 

 bench. I intend eventually to use this 

 house for growing plants at a higher 

 temperature, and I also intend to add a 

 second greenhouse for use at a lower 

 temperature than the above house. 

 Therefore there would be a 2i/^-ineh 

 flow in the greenhouse with the higher 

 temperature and a 2%-ineh flow in the 



To the Man 

 Who Needs a Boiler 



THE CUSTOMERS' INTEREST FIRST— Is the 



basis of the Kroeschell standard, and this princi- 

 ple makes the Kroeschell policy the most liberal 

 of all in the greenhouse boiler business. 



The great variety of boilers we make places us in 

 a commanding position. We make every type of 

 boiler that is used, from the smallest house heater 

 to the largest water tube steam boiler (600 horse- 

 power). For the above reason we can furnish the 

 most efficient boiler unit in every case. 



It is the Kroeschell policy to supply only that type 

 of boiler which is best suited to the conditions, 

 and under no circumstances do we take any 

 other stand. 



ORDER NOW 



Orders may be placed now for delivery during 

 summer or fall of 1922. You can save from 5 to 

 10 per cent if you purchase a boiler during this 

 month. It will pay you to take advantage of this 

 offer. 



EnsineerinK Advice and Quota- 

 tions cheerfully submitted— 

 Let us know your requirements 



KROESCHELL BROS. CO., 



444 W. Eri« Straat 



CHICAGO, ILL. 



