134 



The Florists^ Review 



NOTIMBIB 13, 1919. 



Greenhouse Heating 



Subscribers are invited to write the 

 editor of this department with regard to 

 any details of greenhouse heating that 

 are jiot .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. 



ENOUGH FLOW PIPES. 



I am building a greenhouse 20x105, 

 with three feet of wall and three feet 

 of glass above the wall, making the 

 house six feet high at the eaves. I want 

 to know if a 3-inch flow pipe with six 

 2-inch returns under the side benches 

 will be sufficient to heat it to 60 degrees 

 in zero weather. The west end is pro- 

 tected by the boiler house. I have ce- 

 ment piers eight feet apart for the re- 

 turn pipes to rest on. There is a drop 

 of sixteen inches in the length of the 

 house for the return pipes. I shall use 

 a Lord & Burnham hot water heater. 



W. L. W.— N. y. 



To heat a house 20x105, with three 

 feet of glass in the side walls, we should 

 use something over 1,000 square feet of 

 radiation for 60 degrees in zero weather. 

 Rather less than 850 square feet of ra- 

 diation would be provided by the plan 

 suggested by the inquirer. By careful 

 attention to the firing in the coldest 

 weather, it would be possible to main- 

 tain a temperature of practically 60 de- 

 grees with an efficient heater of ample 

 size, provided the flow and return mains 

 are of ample size. Using a 3-inch flow 

 pipe as suggested, it would not be pos- 

 sible to get the best results from the 

 system, since twelve 2-inch pipes 105 

 feet long are rather more radiation than 

 it could handle to the best advantage. 



We should suggest the use of either 

 two 3-inch or three 2%-inch flow pipes, 

 the latter being preferable, in addition 

 to twelve 2-inch returns. This would 

 bring up the radiation to the required 

 amount and, as the increase in the num- 

 ber of flow pipes would improve the cir- 

 culation, the efficiency of the coils would 

 also be increased. If three flows are 

 used, we should place one upon each 

 plate and the other two feet under the 

 ridge. The returns could be arranged 

 in three coils of four pipes each, with 

 one coil under the middle bench. 



PIPING FOR FIVE HOTBEDS. 



I am seeking information relative to 

 heating beds with hot water pipes. In 

 the beds where I sprout sweet potatoes, 

 I wish to place the pipes under the soil. 

 Judging from what I can learn, this has 

 been done successfully. I have a Mon- 

 inger sectional boiler, estimated to carry 

 2,000 feet of pipe. I am planning to 

 have five beds, fifty feet long. The top 

 of the boiler is about at the ground level 

 of the beds, and the return is about 

 three feet lower, I have 2-inch and 

 1%-inch pipe for this work, but the 

 boiler is tapped for 3-inch pipe. 



If the pipes were placed above the 

 soil in the beds, one of the objectionable 

 features would be this: In order to 

 keep the pipes sufficiently above • the 



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