122 



The Florists^ Review 



September 15, 1921 



Greenhouse Heating 



SuBSiCiUSiXES are invited to write the 

 editor of this department with regard to 

 any details of greenhouse heating that 

 are not, jw^erstood. 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 

 helpful, also, to have a sketch showing 

 the location of the houses. 



AMOUNT OF FUEL NEEDED. 



lluvc any actual tests been made as 

 to the differ encL' in the amount of fuel 

 required to heat a carnation house and 

 a rose house during the winter months? 

 If this subject has been discussed in a 

 previous issue I have overlooked it and 

 I shall appreciate it if you will give me 

 the information. M. F. C. — Utah. 



Not only will the amount of coal re- 

 ((uired tor rose and carnation houses de- 

 pend upon the average temperature out- 

 side, but the ratio between the amounts 

 required for tlie two classes of houses 

 will vary under the same conditions. 

 With a minimum temperature of zero, a 

 rose house will require about one-third 

 more coal than a carnation house, while 

 with 15 to 20 degrees above zero, as a 

 minimum, a rose house will use nearly 

 fifty per cent more coal than a carna- 

 tion house. 



Putting it another way, if a carnation 

 house needs forty pounds of coal for 

 each 1,000 square feet of glass, a rose 

 house will make use of something more 

 than fifty pounds each day in sections 

 where the minimum temperature is zero, 

 while sixty pounds per thousand square 

 feet would be used to heat a rose house 

 with the minimum 15 to 20 degrees 

 above zero, provided, of course, forty 

 pounds would be needed to heat a car- 

 nation house. 



NUMBER AND SIZE OF FLOWS. 



I have a greenhouse, 20 x 60 feet. It 

 is six feet high at the sides and eleven 

 feet to the ridge. It runs east and 

 west, and has a tight, uneven-span roof, 

 with the long span on the south side. 

 There are two glass gables and there 

 are thirty-six inclies of glass in the 

 south wail. The boiler house is at the 

 southeast corner, below the house and 

 the returns. I am going to use a Wilks 

 boiler, 24 x 42.- The heater will be con- 

 nected with an expansion tank. Will 

 you advise me as to the number of 

 floAvs and returns and the correct sizes 

 to use? H. C. H.— Wash. 



The letter is not definite as to the 

 minimum temperature that must be pro- 

 vided for. Taking 2.") degrees above zero 

 as a minimum, the house can \>r heated 

 by using two 2V2-iucli flow pipes on the 

 side wall plates and, after running them 

 to the farther end oi the house, by con- 

 necting each flow pipe Avith three 2-inch 

 return pipes to be carried under the 

 benches. This would require two flows 

 and six returns. In case the tempera- 

 ture does not go below freezing, it will 

 only be necessary to use two returns 

 with each flow pipe. At the most not 

 more than 300 square feet of radiation 



ORDERS FOR 

 KROESCHELL BOILERS 



are coming in fast and it keeps us 

 hustling to fill them. But we are 

 filling them, and we are prepared for 

 an even greater demand for Kroe- 

 schell Boilers than the present. You 

 can rely on us to get your boiler to 

 you in good time if you order now. 





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Kroeschell Hot Water Boilers 



are giving satisfactory service in 

 large and small ranges all over the 

 country. Growers who own them 

 are constantly advising others to in- 

 stall Kroeschell Boilers. If you are 

 in a hurry, telegraph or telephone 

 at our expense. 



KROESCHELL BROS. CO. 



444 W. Eritt Streat 



CHICAGO, ILL 



