' rw. ' "X ^r ^. ^ V '^'"7 ■ '■^ 



142 



The Florists^ Review 



r.JJ.:^;^;.>.i^^•^^^y■<:' .v»</ 



Mat 11. 1922 



1 



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 HOUSES AND LEAN-TO. 



We have under consideration plans for 

 the building of a greenhouse, 35x200 

 feet. The walls are to be eight feet to 

 the gutter, four feet of which will be 

 glass and the other four feet either con- 

 crete or boards. There will be a glass 

 partition in the center of the house, one- 

 half of the house to be heated to 60 de- 

 grees and the other to 50 degrees, with 

 the outside temperature going as low as 

 40 degrees below zero. We expect to 

 build in addition to this house a 50-foot 

 lean-to and another house 12x200 feet. 

 How large a boiler will be necessary to 

 heat these houses if steam is used? How 

 should the piping be arranged? The 

 benches will be solid. Would it be a 

 good policy to install a boiler just large 

 enough for our needs or should we make 

 it a trifle larger than that required by 

 the above-mentioned range? 



B. F. & S. Co.— Ore. 



To heat the proposed range a horizon- 

 tal, tubular boiler of about fifty horse- 

 power will be required. Although not 

 strictly accurate, it will be sufficient for 

 all practical purposes if the boiler is 

 considered to be twelve feet in length, 

 has fifty 3-inch flues and a rating of 

 fifty horsepower. If the flues are less 

 than three inches in diameter, either the 

 number of tubes in the boiler must be 

 increased or the length of the boiler 

 should be proportionately increased. 



To heat the two 200-foot houses it 

 would be advisable to run a 5-ineh main 

 along the partition in the center of the 

 houses, and for the 35x200-foot house 

 run three 2-inch feed pipes in each direc- 

 tion, placing one feed pipe on each side 

 wall plate and the other under the ridge. 

 In addition to these, supply in the west 

 end of the house, if this is selected as the 

 house to be kept at 60 degrees, seven- 

 teen 11/4 -inch returns. Run twelve re- 

 turns in the east end of the house for 

 50 degrees. Reduce the supply pipe to 

 2%-inch, and continue it into the house 

 12x200 feet. To heat this house run one 

 2-inch supply pipe to either end, and, 

 witli each pipe, feed six 1%-inch returns 

 for 60 degrees or four returns for 50 de- 

 grees. 



For the propagating house, if six feet 

 wide with two feet of glass in the side 

 wall, use one l^A-inch flow pipe on the 

 back wall and four 114-ineh returns un- 

 der the bench. For a greater width of 

 house increase the number of returns 

 ])roportionate1y. 



If it will not be difficult to locate the 

 boiler so that the water level will be 

 four feet below the returns in the 

 liouses, it would be advisable to use a 

 gravity system; otherwise install either 

 a steam trap or an electric pump. 



While it would be advisable to use a 



SERVICE 



Our Engineering Department 

 At Your Service 



Let us solve your heating problem 

 for you. W^e have assisted 

 many growers in the development 

 of successful heating systems and 

 our engineering department offers a 

 service and the benefit of a knowl- 

 edge and experience of incalculable 

 value to those who contemplate the 

 erection of heating plants, no matter 

 how small or large, hot water or 

 steam. 



You can »av money 

 by ordering now 



ORDERS may be placed now for 

 delivery during summer or fall of 

 1922. You can save 5 to 10 per cent 

 if you purchase a boiler during this 

 month. It will pay you to take ad- 

 vantage of this offer. 



WHEN YOU BUY- 

 QET A KROKSCNCLL 



IT SAVES 

 COAL and LABOR 



KROESCHELL BROS. CO. 



444 W. Eri« Str««t 



CHICAGO, ILL. 



