136 



The Rorists^ Review 



Fkbbdabt 16. 1922 



Greenhouse Heating 



Subscribers are invited to write the 

 editor of this department with regard to 

 any details o£^ 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 tempera- 

 tures should be stated in the inquiry, as 

 well as the amount of glass in the side 

 walls, and the dimensions and general 

 arrangement of the greenhouses. It is 

 often helpful, also, to have a sketch 

 showing the location of the houses. 



PIPINa ASBANQEMENT. 



We are building two greenhouses, 12x 

 100 feet. The side walls are constructed 

 of three feet of concrete and two feet 

 of glass, while one end is exposed and at 

 the other there is a boiler room, 12x24 

 feet. What are the heating require- 

 ments if the temperature to be main- 

 tained is 55 degrees in zero weather 

 and how should the piping be arranged! 



E. J. R.— O. 



To heat the houses described above to 

 55 degrees, a little less than 1,000 square 

 feet of radiating surface will be required 

 or a little more than one-half that 

 amount if low-pressure steam heat is 

 used. 



While the installation of a steam 

 heating system would cost considerably 

 less than a hot water system, the labor 

 of firing and the cost of fuel would be 

 considerably greater and, in a plant of 

 this size, which is too small for a regular 

 night fireman, there would be more fluc- 

 tuation in the temperature. For this 

 reason it would be advisable to use a 

 hot water system for these houses. 



While a somewhat smaller boiler 

 might be used, it is recommended, espe- 

 cially if soft coal is to be burned, 

 that a boiler rated at from 1,600 to 

 1,800 square feet of radiation be in- 

 stalled. Although it would vary with 

 different makes of boilers, a grate with 

 a diameter of thirty inches should be 

 large enough to provide the heat re- 

 quired. 



Just how the piping should be planned 

 will depend somewhat upon the arrange- 

 ment of the benches. Each of the houses 

 should have six 2-inch returns and, if 

 all of the returns are to be either on 

 the side walls or under the side benches, 

 they could be supplied by means of two 

 2%-inch flow pipes, to be carried on the 

 side wall plates and there would be 

 three returns in each coil. 



If returns are also desired in the mid- 

 dle of the house, it will be advisable 

 to use three 2-inch flow pipes, one of 

 which should be two feet below the ridge 

 and the returns should be in three coils 

 of two pipes each. 



MORE FLOWS THAN RETURNS? 



We wish, if necessary, to heat a cold- 

 franio, 3x8x62 feet, to a temperature of 

 50 degrees when the outside tempera- 

 ture is 10 below zero. The back and 

 the two ends of this frame are con- 

 crete, hut the front is made of glass. 

 We have heeii advised that it is neces- 

 sary to have three .T-inch flows and one 

 3-inch return. This seems strange to 

 me, as I have always been under the 

 impression that more returns than fldw 

 pipes are ro()uired. Will yon kindlv sug- 



I 

 H 

 B 

 B 

 IB 

 II 

 B 

 B 





Wrigley Building, Chicago. 



Kroeschell) To Be Sure 



To the many wonderful things of which Chicago boasts, there 

 has been added recently the Wrigley Building. It is oa<^ of 

 the largest office buildings in the city, and one of the ntost 

 beautiful to be found anywhere. Its design and construction 

 is perfect throughout. '" 



In such a large building, where there are hundreds of offices, 

 where the health and comfort of thousands of people must be 

 guarded, the heating system plays a part of tremendous im- 

 portance. This was realized by the designers of the Wrigley 

 Building, and the greatest care was taken in making specifi- 

 cations for the heating system. Two 250-horsepower Kroe- 

 schell Boilers were installed for heating the entire building. 



In selecting a boiler for your greenhouses, get the boiler that 

 has proved itself the most efficient in every way for greenhouse 

 heating. Get a Kroeschell and know you have the best. 



No Delay 



We anticipated a rush of orders this winter that will 

 require quick service, and we are prepared to ship any size 

 boiler at once. Telegraph or telephone your order at our 

 expense. Long distance phone, Superior 8680. Ask for green- 

 house department. You will get your boiler without delay. 



KROESCHELL BROS. CO. 



444 W. Eri* Stfe«t 



CHICAGO, ILL. 



