124 



The Florists^ Review 



OCTOBBB 21. 1920 



Greenhouse Heating 



Subscribers are invited to write the 

 editor of this department vrith 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 walld, 

 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. 



HEIGHT OF STACK. 



I have a greenhouse 16x70 feet. It 

 is ten feet high at the ridge and six 

 feet two inches at the eaves. The work- 

 shop, 14x16 feet and ten feet high, has 

 a 2-foot double flooring with building 

 paper between. The boiler room is a 

 6-foot concrete basement with windows, 

 16x24 inches, on both sides. The house 

 faces the southeast on a 50-foot lot, 

 with another house on each side. 



I have a 2-inch flow on each vside 

 under the eaves and five l^/^-inch returns 

 on each side. Have I piped it correctly 

 and have I enough piping? 



I have a 16-foot brick smokestack, 

 14x17 inches. My draft is good. I 

 have a No. 32 National hot water heater, 

 but had trouble last winter keeping up 

 heat. Do I need a larger heater or what 

 do you think is the matter? 



G. F. W.— 111. 



The temperature desired in the green- 

 house is not stated. For 50 degrees in 

 zero weather a heater rated for 600 

 square feet should be used, and for 60 

 degrees it should have a rating of 750 

 square feet if soft coal is to be used. 

 I am not familiar with the ratings of the 

 National hot water heaters. 



The piping now installed provides 

 radiation sufficient for rather more than 

 50 degrees in zero weather, but it would 

 be preferable to use two 2% -inch pipes 

 as flows. For 60 degrees, two 2% -inch 

 flow pipes and twelve 1%-inch returns, 

 or better yet, ten 2-inch returns, should 

 be used. Arrange the flow pipes so 

 that the highest point will be near the 

 heater and connect this with the ex- 

 pansion tank. 



If a good draft can be secured with 

 a chimney sixteen feet high, that should 

 suffice, but it would be better to carry 

 the stack to a point two or three feet 

 higher than the adjacent houses. 



littij: glass exposed. 



I am building a greenhouse 17 5/6 x 

 41 feet. It is built on the north side 

 of a greenhouse of the same size and 

 is connected to the gutter of the latter. 

 The new house will have a 5-fo,ot wall 

 of concrete which, on the north side, will 

 extend to the gutter. The south side 

 will be glass nearly down to the grade, 

 which is ten feet to the ridge. The 

 east end is to be solid wood. 



I wish to heat this house to 55 degrees 

 in zero weather. The boiler is in the 

 east corner of the old house. I have a 

 work room next to the boiler room, and 

 this extends across the width of the 

 house. So I shall have to carry the flow 

 and return through the work room. I 

 have a No. 60 Giblin steam boiler. Will 

 this heat both houses? 



The new house will have ground beds 



^> 



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