124 



The Florists^ Review 



FKltitlAKV 24. 1921 



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. 



PIPING AND HEATING. 



1 nm building greenhouses with sor- 

 ond hand material and with local help. 

 One liouse is 20x77V^ feet, with a parti- 

 tion at twenty feet. There is also one 

 lojiii-to, 6x77% feet. The two houses 

 nu')itionod .are completed. We arc 

 running short of pipe, so are asking ad- 

 vice on the house to be completed, which 

 is 20x77V{: feet. I am planning to have 

 Ihree benches 4x4x7 feet. How should 

 1 pipe it to have a temperature of 58 

 degrees at 10 degrees below zero? I 

 lun e about 300 feet of 2%-inch pipe and 

 a quantity of 2-inch pipe. I have a 

 boiler at the present time, but fear it 

 is too small. What size should I figure 

 on? I may later add another lean-to 

 on the south side. Please also comment 

 on the parts finished. R. B. — Wis. 



For the house yet to be built we 

 should use three 2i4-inch flow pipes and 

 eleven 2-inch returns, placing one flow 

 on each side wall plate and the other 

 three feet below the ridge, with three 

 returns in the coil under the north bench 

 and four under eacli of the other 

 benches. We should use 4-inch pipes 

 for the main flows and returns. 



In the houses already piped we note 

 that in addition to one 4-inch and one 

 i?-inch overhead flow, which are re- 

 duced to 3-incli and 2^2 inch, respec- 

 tively, after j)assing the partition, there 

 are sixteen returns in the 20-foot house, 

 with eight returns under the bench in 

 the propagating house and one carried 

 on the plate. These returns are all 

 supplied by the overhead flows of the 

 20-foot house. 



So far as we can make out from the 

 letter and the accompanying sketches, 

 the size of the returns is not given. We 

 should not consider it necessary to use 

 more than ten 2-inch returns in the 20- 

 foot house, while if they are IVa-inch, 

 thirteen would be ample. To provide 10 

 degrees of bottom heat in the propagat- 

 ing house, we should use eight 2-inch 

 returns, placing two of them at the 

 jilate and the others under the bench. 

 Aside from wliat appears to be an ex- 

 cessive amount of radiation in the 20- 

 foot house, tlie principal objection we 

 note is that the flow pipes which supply 

 the coils are too small. While those 

 supplying the south side of the 20-foot 

 house will answer fairly well, we should 

 prefer to use a 2i/^-inch pipe to supply 

 lach coil. 



From tlie sketch we note that the 

 3-inch flow pipe on the north side of the 

 house is reduced to two and one-half 

 inches before any of the coils have been 

 connected, and then reduced to two 

 inches after supplying one coil of four 

 returns. This 2-inch flow, then, not only 

 supplies llie remaining coil in this house, 

 but is cfintiniKMl into tlie le.nn-to, where 



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 ornamf ntal 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, "i- ■ iMMk. «Kr 



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 Uaequaled 

 Fuel Economy" 



BUY DIRECT- 

 FACTORY TO USER PRICES 



KROESCHELL BROS. CO., 



444 W. Erie Street 

 CHICAGO, liL. 



