no 



The Florists^ Review 



July 22, 1920 



Greenhouse Heating 



Subscribers are invited to write the 

 editor of this department with regard to 

 any details of greenhouse heatbig 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. 



AMOUNT OF PIPE. 



How much pipe shall we have to use 

 to heat the houses shown in the sketch 

 I am sending you? We are going to use 

 steam heat and have 3-inch pipe for 

 flows and 1 14 -inch pipe for returns. 

 The outside temperature goes as low as 

 5 degrees below zero. Is the temper- 

 ature in the houses correct for what we 

 grow! H. & S.— O. 



The^ sketch shows two houses, 150 

 feet in length and twenty-two and 

 twenty-five and a half feet in width 

 respectively, with three feet of glass 

 and three feet of concrete in each side 

 wall. The houses are to be used for 

 lettuce, geraniums and carnations and 

 48 to 52 degrees is noted as the temper- 

 ature to be maintained at night, which 

 is about correct. 



While a 2% -inch flow pipe would be 

 amply large enough to serve as a steam 

 main in each of the houses, a 3-inch 

 flow might be used to good advantage. 

 The flows should be carried about four 

 feet below the ridge. In addition to 

 the 3-inch flow pipe in each house, seven 

 1%-inch returns will be needed in the 

 house twenty-five and a half feet wide 

 and six returns in the other house. 

 Place three of the returns on the ex- 

 posed wall of each house and distribute 

 the others on the inside walls and under 

 the middle benches. In case 2%-inch 

 flow pipes are used, an additional re- 

 turn will be required in each of the 

 houses. The main return should bo 2- 

 inch, with a 1%-inch pipe leading to 

 each house, and these should be con- 

 nected with the individual coils by 

 means of lJ4-inch pipes. 



About 350 feet of 3-inch and 2,000 

 feet of IVi-inch pipe will be required 

 for the two houses. 



TAPPING BOILER AGAIN. 



I have a 20-horsepower hot water 

 boiler tapped for a 3-inch flow and re- 

 turn. This heats one house, 20x100 

 feet. Will this boiler heat another 

 house, 20x100 feetT Can I tap this 

 boiler again in the same way for the 

 new house, or would the water for both 

 houses have to come through one flow 

 and return! W. W.- 



The letter does not state the tempera- 

 ture desired in the houses, or whether 

 there is any glass in the side walls. 



If a temperature of 60 degrees will 

 be sufficient and if there is no more than 

 thirty inches of glass in the walls of 

 the houses, there should be no difiiculty 

 in heating a second house 20x100 feet 

 with a 20-hor8epower boiler. 



The boiler should again be tapped 

 for a 3-inch flow and return, but it is 



The Reward of Merit 



The White House Greenhouses— U. S. Propagating Gardens, 



Washington, D. C. 



HEATED BY KROESCHELL BOILERS 



The conservatories of the Presi- 

 dent of the United States and the 



U. S. Propagating Gardens are 



located opposite the Washington 



monument at Washington, D. C. 



Over forty greenhouses are devoted 



to the growing of cut flowers, 



orchids, stove plants, tropical and 

 decorative stock, and all bedding and ornamental plants for the 

 U. S. Government buildings and grounds at Washington. 



A No. 11 KROESCHELL BOILER was installed in 1906 for the 

 high temperature houses. This boiler replaced a number of other 

 makes and made a remarkable record for fuel economy. 



UNCLE SAM'S IRON FRAME RANGE ERECTED IN 1910 

 IS HEATED BY KROESCHELL BOILERS. 



The Plant Introduction Garden of the United States Department 

 of Agriculture at Chico, California, is heated by No. 2 Kroeschell 

 Boiler and Generator System. 



In 1912 two No. 5 KROESCHELL BOILERS were installed for 

 the new range of the U. S. Department of Agriculture, at Garret 

 Park, Md. 



The U. S. Government's new establishment, the Northern Great 

 Plains Field Station, at Mandan, N, Dakota, ordered a No. 7 KROES- 

 CHELL BOILER for the new greenhouse range erected in 1913. 



August, 1914, two more No. 11 KROESCHELL BOILERS were 

 ordered for White House Conservatories and U. S. Propagating 

 Gardens, Washington, D. C. 



WHEN YOU BUY- 

 GET A KROESCHELL 



"The Boiler of Unequaled 

 Fuel Economy" 



BUY DIRECT- 

 FACTORY TO USER PRICES 



KROESCHELL BROS CO., 



444 W. Erie Street 

 CHICAGOp ILL. 



