150 



The Florists^ Review 



DlCBMBBB 1, 1921 



the flow pipes on the plates, and if so, 

 it would be well to have that arrange- 

 ment. 



The heater for such a house should 

 have a rating of about 300 square feet 

 if soft coal is to be used. If a second 

 house is to be built in the near future, 

 it would be advisable to put in at this 

 time a boiler sufficiently large for both 

 houses. Its rating need not be more 

 than 500 square feet. 



REARRANGING OLD SYSTEM. 



I have two greenhouses, 32%xl54 

 feet. The heating system now in opera- 

 tion in these greenhouses is only capable 

 of heating the houses to 52 degrees in 

 zero weather, and I wish to change it so 

 that it will heat the range to 65 degrees 

 in zero weather. All pipes are to run 

 overhead and on center purlin posts ex- 

 cept those hung on the side walls. Would 

 four 2% -inch flows with four 2-inch re- 

 turns to each flow heat the range to the 

 desired temperature? B. J. P. — Pa. 



As far as the amount of radiation is 

 concerned, four 2%-inch flow pipes and 

 sixteen 2-inch returns will give prac- 

 tically all the radiation that will be re- 

 quired to heat the house to 65 degrees 

 in zero weather, but each of the flow 

 pipes will have to supply nearly 500 

 square feet of radiation. If possible to 

 make the connection, it would be advis- 

 able to use five 2i^-inch flow pipes and 

 fifteen 2-inch returns. However, as the 

 lower ends of the returns will evidently 

 be six or seven feet above the top of the 

 boiler, it would be possible to maintain 

 the temperature desired by heavy firing. 

 It is noted from the sketch that the re- 

 turns drop three feet throughout their 

 entire length in the houses. This drop is 

 much more than is necessary, and it will 

 be found that the best circulation is se- 

 cured when the returns are carried as 

 high as possible. It is not advisable to 

 drop more than from eight to fifteen 

 inches if the pipes are properly graded. 

 Run the flow pipes downhill. 



[ 



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