130 



The Florists^ Review 



Januart 20. 1921 



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. 



TWO-INCH PIPES WILL SERVE. 



We installed a hot water boiler last 

 summer and, not being able to get the 

 proper pipe and fittings, we we*e com- 

 pelled to use 2-inch pipe all kiBOUgh 

 for flows, returns and coils. V 



I have seen in several catalogues the 

 Honeywell patent mercury generators 

 to increase circulation where small 

 mains are used. We use a pressure sys- 

 tem, consisting of an expansion tank 

 about three feet higher than the high- 

 est flow pipe, connected from the bottom 

 to the base of the boiler, with a check 

 valve where it enters the boiler. This 

 is of %-inch pipe. We take our air 

 from several of the highest flows with 

 a %-inch pipe which runs up above the 

 expansion tank, where there is a safety 

 valve, set at thirty pounds of pressure, 

 and the water, as it expands, runs 

 through the safety valve back into the 

 tank again. Will you kindly let me know 

 whether our system at thirty pounds of 

 pressure is as good, or gives as good re- 

 sults as would a mercury generator. 



M. L. G.— Pa. 



If the arrangement of the system is 

 such that tlie water can actually be 

 placed under thirty pounds of pressure, 

 it should materially affect the circula- 

 tion of the water, as it will raise the 

 point at which the water will boil. In 

 this respect, it will serve as well as a 

 mercury generator, and may be even 

 more efficient, unless the latter is so con- 

 structed that it will give more than 

 thirty pounds of pressure. 



Whatever method of placing the sys- 

 tem under pressure is used, it will in- 

 crease the amount of coal used. Unless 

 the house is more than 100 feet in length, 

 2-inch pipe answers for flow pipes with 

 an open-tank system, but for houses of 

 that length we should not use more 

 than two 2-inch or three 1%-inch pipes 

 for each flow. It should not be a dif- 

 ficult matter to change the system so 

 that some of the returns can be used 

 as flow pipes. 



NOT ENOUGH PIPE. 



I have just completed a greenhouse 

 in a secluded spot and I should like to 

 have some information in regard to the 

 piping. It is 18x50 feet, and I should 

 like to heat it to 60 degrees in zero 

 weather. The side walls are thirty-six 

 inches from ground to gutter plate. It 

 is an even-span house, running east and 

 west, being ten feet from ground to 

 ridge. It is protected on the north side 

 by a 30-foot barn and on the west side 

 by a 12-foot machinery shed. 



I have on hand 100 feet of 2-inch 

 pipe and also about 400 feet of V/i- 

 inch pipe, which I should like to use. I 

 planned to keep all piping under the 



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V 



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