134 



The Flonsts' Review 



jANr.uiv 5. 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. 



HEATING THREE HOUSES. 



Enclosed you will find a sketch of the 

 greenhouses which we are now building, 

 and in the construction work of wliieli 

 we have reached tlie point where we 

 are ready to install the heating system. 

 Please inform us what size the flows and 

 returns should be in a hot water system. 

 The temperature which we wish to main- 

 tain is approximately 65 degrees in a 

 climate wliere the temperature goes as 

 low as 15 degrees below zero. 



0. J. M.— O. 



From the sketch it is apparent that 

 there are three houses 16x100 feet, with 

 three feet of concrete and three feet 

 six inches of glass in the side Avails, and 

 glass in all of the gables above the 

 three feet of concrete. The sashbars 

 have a length of eight and ono-lialt' 

 feet. 



There will l)e, then, about 6,3.36 square 

 feet of exposed glass and 888 square feet 

 of concrete. To heat these houses with 

 hot water, to 65 degrees, about 2,500 

 square feet of radiation will be neces- 

 sary, of which 740 square feet should be 

 in the inside house and 880 square feet 

 in each of the outside houses of the 

 range. 



The suggestion is made that two 2- 

 inch flow pipes be used in eacli of the 

 houses, but it would not be advisable 

 to use less than three 2-incli or two 

 2'/o-inch flows in each house and it would 

 be preferable to use three 2i^-inch flows 

 in each of the outside houses, where O.l 

 degrees is to be maintained when tlie 

 outside temperature is 15 degrees below 

 zero. 



With three 2-incli flows in the inside 

 house, eight 2-incli returns will be neces- 

 sary, and if three 2Vj-inch flows are used 

 in the outside houses, ten or eleven 

 2-inch returns will provide the required 

 amount of radiation for the coils. If 

 three 2-incli flows are used in each of tlio 

 outside houses, eleven or twelve 2-inch 

 returns should be used. 



Place the flow pipes on the wall })lates 

 if two flows are used, with the third 

 flow two feet below the ridge. With 

 two flow pipes, the returns should he 

 in two coils under the side benches or 

 on the side walls, while with three flow 

 jiipes, the returns should be so dividi'd 

 that there will be a third coil under tlie 

 middle bench. In the outside houses, 

 the additional returns should be ;iloiig 

 the exposed walls. 



Give all pipes a slight fall and connect 

 the expansion tank with the highest 

 point in the system. If more than one 

 flow l>ipe starts at the boiler, the highest 

 point of each flow should be connected 

 with the pipe which leads to the ex- 

 jiansion tank. 



If soft coal is to be burned, it would 



What you get 



when you get 



a Kroeschell 



A Steel Plate Boiler. 



A better boiler than a cast iron boiler. 



A boiler that will not crack. 



A boiler that will outlive any other. 



A boiler that burns the lowest grades of coal eflRciently. 



A boiler that will give you complete control of temper- 

 atures in your greenhouses. 



A boiler that will save you many tons of coal every season. 



A boiler that is used more for greenhouse heating than 

 any other boiler. 



A boiler at a reasonable, direct-from-factory-to-user price 

 (we have no agents). 



A boiler that has proved itself the best for greenhouse 

 heating by years of satisfactory service in the largest 

 greenhouses. 



A boiler that is most highly praised by expert growers 

 everywhere. 



A boiler that will increase your profits by helping you 

 grow more and better flowers with less expense. 



And— 



You can get any size Kroeschell Boiler at once. Tel- 

 egraph or telephone your order at our expense. Long 

 distance phone Superior, 8680; ask for Greenhouse 

 department. 



KROESCHELL BROS. CO. 



444 W. Eris Streat CHICAGO, ILL. 



