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122 



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The Florists' Review 



Apbil 15. 1920 



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. 



NUMBEE OF FLOWS. 



Would you tell me how many 2-inch 

 flow pipes a 4-inch main will take care 

 of in a hot water system? The flows 

 are 100 feet long, with two returns on 

 each flow to the main returns. Some 

 local plumbers say that they can carry 

 ten, while others say five. 



E. F. C— Wash. 



The amount of radiation which can 

 be handled by a 4-inch flow pipe will 

 depend upon the height of the system 

 and, particularly, of the returns above 

 the boiler, which is not stated. If the 

 lowest part of the coils is two feet above 

 the top of the boiler, ten 2-inch returns, 

 100 feet in length, should not be con- 

 sidered an excessive amount to be car- 

 ried by a 4-inch flow of the same length, 

 especially if the flow pipe is on the 

 plate or overhead. 



The radiation furnished by the flow 

 and returns will only be 750 square feet. 

 It is a safe rule with coils of a length 

 of 100 feet to arrange the piping so that 

 the combined area of the returns is 

 twice the area of the flow pipe. With 

 this as a basis, I should have eight 

 2-inch returns for a 4-inch flow pipe, es- 

 l^ccially if the returns are only level 

 with the top of the boiler. It is prefer- 

 able to use this number of returns in- 

 stead of ten. 



Instead of using a 4-inch main, a 2i/^- 

 inch flow pipe with about three 2-inch 

 returns can be used, although four re- 

 turns, 100 feet long, may be used with 

 a 2V2-inch flow if they are two feet 

 above the top of the boiler and the flow 

 pipe runs downhill, at a somewhat high- 

 er level. The slope need not be more 

 than one inch in fifteen or twenty feet, 

 or just enough to allow the air to go to 

 the highest point in the system. 



FIVE HOUSES, ONE BOILER. 



I am sending you a sketch of my 

 range in order to find out how to pipe 

 it to get a temperature of 60 degrees 

 when it is 15 degrees below zero. I 

 grow cut flowers and pot plants. Of my 

 five greenhouses, two have just been 

 finished, but have not yet been piped. 

 I have one No. 5 Kroeschell hot water 

 boiler and have piped house No. 1 with 

 the help of the drawings which the 

 Kroeschell Bros. Co. sent me when I 

 bought the boiler. House No. 2 is piped 

 on the same plan except that there is 

 not so much piping in it, as I did not 

 want this house so warm. Experience, 

 however, has shown that it has not 

 enough piping in it to keep up a tem- 

 perature for carnations, snapdragons, 

 sweet peas and calendulas, but this can 

 be remedied. House No. 3 I piped in 



KROESCHELL 



GREENHOUSE SPECIALTIES 



NOT 



CAST 



IRON 



Mad* in 20 Sizes 



HEATING and COOLINH arr two hrai.clie« i>f engiiiecri..K un 

 whick we ■pecialize for the greeahoase trade. 



Over thirty years have been dcv-ited hv ns to rlie construction 

 and designing of boilers and refrigerating apparatus. 

 During this period we have furnished and installed heating and 

 cooling systems for the most successful greenhouse men in this 

 country. 



Tubeless Boiler 



KROESCHELL Boilers are making the most wonderful green- 

 house heating record in the world. Florists who have used 

 other malces are constantly giving the KROESCHELL the 

 highest praise. 



KROESCHEU.: 



PIRt&c WATER TUBt 



»A.TCNTeO !•!> 



BOILER- 



The High Pressure Kroeschell— a highly efficient unit for steam 

 plants 100 H. P. and over. 



13,468,520 sq. ft. of glass was equipped with KROESCHELL 

 Boilers during the past five years. 



Water Tube Steam Boiler 



When in need of refrigeration investigate the Kroeschell Sys- 

 tem — its high efficiency and low cost of operation place the 

 Kroeschell System of Refrigeration in the foremost rank for 

 greenhouse use. Our system of Refrigeration and Cooling is 

 easily installed — perfect control of temperature and absolute 

 safety insured — no ammonia used for this system. 



No 



Ammonia 



Used 



Send for Boiler or Ice Machine Catalogues. 

 State which is wanted. 



BUY DIRECT-FACTORY TO USER PRICES 



KROESCHELL BROS. CO. 44. ^--. e^. «._„. 



KROESCHELL BROS. ICE MACH. CO. Chicago, ill. ' 



