134 



The Florists' Review 



NOTEMBKE 18, 1920 



GreenhoBse Heating 



SuBSORiBKRS ve 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. 



HEATING TWO HOUSES. 



As I am now completing my green- 

 house and am ready fur the heating 

 plant, I should be glad to receive ad- 

 vice about it. I am sending a rough 

 sketch of my two houses, which are 

 16x40 each. They are eight feet to the 

 ridge and five to the eaves. Half-way 

 up the sides there are double wood walls 

 filled with sawdust, and the rest of the 

 structure is glass. The houses run east 

 and west. There is no partition between 

 the two houses. They are protected on 

 east and west sides. 



The pipe I have is 2-inch, 3-inch and 

 4-inch. The boiler is a 5-section one 

 made by the American Eadiator Co. 

 Heating is by hot water. In each house 

 there are two raised beds three feet 

 wide with pipes running under them 

 and between these the center beds are 

 six feet wide and built on the ground. 



In the first house I have arranged 

 four 2-inch return pipes under each 

 raised bed. In the second house I 

 have four 2-inch pipes under the south 

 bed and three 2-inch pipes under the 

 north raised bed. I have cut-offs at 

 inlet and outlet of these pipes. 



Would you advise using one or two 

 lead pipes, and of 3-inch or 4-inch pip- 

 ing? The boiler return is 4-inch, that 

 being the size of the lead. 



J. R. S.— Ind. 



Neither the letter nor the diagram 

 indicates clearly just what size of pipes 

 has been used for the leads. It would 

 be preferable to use two 2%-inch flow 

 pipes in each house, placing them upon 

 the plates, but it would suffice if one 

 3-inch flow were carried under the ridge 

 of each house. 



The temperature desired in the houses 

 is not stated, but flows of suitable size 

 would probably secure 55 to 60 degrees 

 in zero weather in the first house and 

 50 degrees in the second. If 60 degrees 

 is desired in the first house when the 

 atmospheric temperature is 10 degrees 

 below zero, it would be well to put in 

 an additional return on the north side. 

 Two more pipes would increase the 

 economy of firing, especially in severe 

 weather. 



BOILEB TOO LARGE. 



I am building a small lean-to, 12x35 

 feet, 0:1 the south side of my residence. 

 This runs east and west and is well 

 protected on the east by another build- 

 ing. .1 want to keep a temperature of 

 55 degrees in the coldest winter weather. 

 The ridge is six and one-half feet from 

 the ground. The south slope is ten feet 

 long and the north is four feet long. 

 On account of windows in the residence, 

 it is necessary to have a low roof. The 

 front and end walls are each eighteen 



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