120 



The Florists^ Review 



Mabch 24, 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. 



LEAN-TO IS PBEFEBABLE. 



I want to build a propagating house. 

 The structure is to be about sixty feet 

 long and I have the material on hand. 

 Would you advise a lean-to or an even- 

 span rooff It is to be erected on the 

 north side of a house running east and 

 west. If I build a lean-to, the bars I 

 have on hand will allow a house ten 

 feet wide and eight feet high. What 

 about the heating and benches t I am 

 using steam at present and have a suf- 

 ficient amount to heat the new house. 



E. C. S.— Mo. 



While an even-span roof is ordinarily 

 preferable for a propagating house, in 

 your case, where it is to be built against 

 the north side of another house, with a 

 wall at least eight feet high, we 

 should advise the use of a lean-to roof, 

 since it will be easier to handle the 

 water. On a lean-to roof there will be 

 less danger of damage by ice from the 

 higher roof. In either case, the water 

 from the higher house should be carried 

 off by means of a gutter. 



We should plan for two propagating 

 beds, with a walk in the middle of the 

 house. It will be found more convenient 

 if the beds do not exceed forty-two 

 inches in width. 



Nothing is said regarding the temper- 

 ature desired, or the classes of plants to 

 be propagated, but it will probably 

 answer, provided there is no glass in the 

 south wall, if a 1%-inch main is carried 

 along the south wall and connected at 

 the farther end of the house with two 

 coils, each containing three 1%-inch re- 

 turns. Place one coil under each of the 

 benches and provide valves so that one 

 pipe in each coil can be shut off. 



TO CHANGE HEATING SYSTEM. 



Intending to change my heating sys 

 tem from hot water to steam, I should 

 like some information regarding the 

 number of flow and return pipes re- 

 quired to hold a temperature of 55 

 degrees in weather 15 degrees below 

 zero, using 2-inch pipe for flows and 

 114-inch pipe for returns. 



There are five houses, each 40x175 

 feet, with 6-foot side walls, three feet of 

 glass and three feet of cement. Would 

 two 40-horsepowcr boilers do the work 

 without being pushed, burning soft coalf 

 What size of chimney would be neces- 

 sary to obtain a good draft? 



P. E. E.— Mass. 



The relative number of flows and re- 

 turns will depend upon the number of 

 'coils desired. We should not care to 

 use less than four 2-inch flow pipes in a 

 house of the size described, and, in addi- 

 tion to the above radiation, we should 

 use twelve 1%-inch returns, thus secur- 



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