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154 



The Florists^ Review 



Mat 18, 1922 



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 do- 

 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. 



BOIIiEB NOT ADEQUATE. 



My boiler is a Furman, size 226. It 

 has five sections and its grate area is 

 18x30 inches. There are two outlets at 

 the top, and two inlets; that is, one inlet 

 on each side, all using 3-inch pipe. 

 There are two greenhouses, 18x70 feet 

 and 21x70 feet respectively. The walls 

 of the houses are five feet high, with 

 one foot of glass in each wall. The 

 greenhouses run east and west, and the 

 boiler is located in a service building 

 at the east end of the greenhouses. The 

 temperature to be maintained in one 

 house is 60 degrees and in the other it is 

 50 degrees when the outside tempera- 

 ture is zero. Is ' the boiler large 

 enough for the purpose? How should 

 the piping be arranged! 



H. K.— N. Y. 



Our experience with the Furman 

 boiler of the size mentioned is limited, 

 but from what wo know of other sizes of 

 this boiler, and of boilers of the same 

 size made by other firms, we judge that 

 the Furman, size 226, will be rated by 

 its manufacturers at about 1,000 square 

 feet of hot water radiation. This is al- 

 most exactly the radiation required in 

 the two houses described above, pro- 

 vided the larger house is kept at 50 de- 

 grees. 



However, no allowance has been made 

 for mains, and it is always advisable 

 to use a heater rated for at least 

 twenty-five per cent more than the ac- 

 tual radiating surface, even when hard 

 coal is used, while for soft coal it is 

 customary to use a boiler rated at from 

 fifty to seventy-five per cent more than 

 the radiation to be covered. If the 

 house is well built and somewhat shel- 

 tered, it would probably be possible to 

 maintain the temperatures mentioned, 

 but it would be at the expense of fuel 

 and would require frequent firing. 



ATTACHING ADDITIONAL LOADS. 



I have one greenhouse, 16x160 feet, 

 with a boiler which has a 24x30-inch 

 grate. Is it possible to heat another 

 house, built adjacent to the first house, 

 with the heating system already in 

 operation? D. Z. — ^Pa. 



The temperature which it is desired 

 to maintain in the second house is not 

 stated, neither have we any means with 

 which to determine the amount of glass 

 in the walls. It may be stated, however, 

 that for a temperature of 50 degrees in 

 a section of the country where the out- 

 side temperature does not go below 10 

 degrees below zero, 800 square feet of 

 radiation would be required, provided 

 that there is no glass in the walls. "With 

 thirty inches of glass in each wall, 



The Kroeschell System Will 



Put High Temperature Into 



Your Heating Lines 



Centralize your heat supply and save the ex- 

 pense of needless fuel and labor. The highly 

 effective combination of Kroeschell Boilefs 

 and Piping Systems will make every dollar 

 you spend for fuel do its utmost. 



Kroeschell Boilers are used in the largest and 

 most successful establishments in the country 

 and have won the favor of men who are well 

 known for their expert knowledge of green- 

 house requirements and the flower growing 

 business. 



Order Your Boiler Now 



Orders may be placed now for delivery dur- 

 ing 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 advantage 

 of this offer. 



Encineerinc Advice and Quota- 

 tions clieerfully submittod— 

 Let us Icnow your requirements 



KROESCHELL BROS. CO. 



444 W. Erie Street CHICAGO, ILL. 



