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130 



The Florists' Review 



Mabch 4, 1920 



Greenhonse Heating 



HEATING WITH SOFT COAX.. 



I intend to build a greenhouse this 

 spring, 20x75 feet. One gable end will 

 be glass and the other will be built 

 against a wooden building. The house 

 viii have concrete walls three feet 

 Idgh and no benches, but all ground 

 beds. It will be six feet from the 

 floor of the greenhouse to the bottom of 

 the boiler. What size of boiler and what 

 size and number of returns will be 

 necessary to give 60 degrees in zero 

 weather f I shall burn soft coal. Can 

 tJ • boiler get along without a nigl t 

 fireman! S. S. D. — Pa. 



As nearly as can be estimated from 

 the data furnished, about 700 square 

 feet of hot water radiation, including 

 tha mains, will be required to heat the 

 house described. For this, a grate with 

 a diameter of twenty-four or twenty- 

 f e inches can be used, the heater 

 having a rating of 900 to 1,000 square 

 feet, with soft coal as the fuel to be 

 used. 



For piping the house, it is advisable 

 to use three 2%-inch overhead flow 

 pipes. These may start at the heater 

 or a 4-inch main may b3 used. The 

 rturn connections with the heater may 

 either be three 2%-inch or one 4-inch, 

 without regard to which is used for 

 the flows. Bun one flow pipe upon each 

 purlin and the other a foot or so below 

 the ridge. Nine 2-inch returns will be 

 required, of which three shomd be upon 

 each wall and the others in the walks 

 on the side of the beds. Bun the flows 

 downhill with a slope of one inch in 

 fifteen feet and connect the expansion 

 tank with the highest point in the sys- 

 tem. 



No regular night fireman will be re- 

 qiiired. 



SUmnNO FLOW pifes upkell. 



We are goin; to install a complete 

 heating system this summer, including 

 piping, boiler and boiler room. Every* 

 thing is to be new; we have no ma- 

 teria on hand. We are assuming that 

 hot water will be the best for us. 



The enclosed sketch shows the sizes 

 and exposures of our houses. All three 

 are in first-class condition. Each house 

 has five 5-foot concrete benches and 

 two narrow benches as shown in house 

 No. 3. 



Our plan is to run two 2-inch flows 

 on the north and south sides and returns 

 under the benches that are under the 

 gutters. The main flows and main re- 

 turns are to be underground at the east 

 end of the benches, with one 2-ineh 

 flow under each bench at the west end 

 of the bench and one 2-inch return or 

 more, if necessary, under the same 

 bench. This is in order to have as few 

 pipes as possible exposed to view. 



The location for the boiler room is 

 low and the top of the boiler will be 

 two or three feet below the ground 

 line at the east end of the greenhouses, 

 which have a fall of thirty inches from 

 the west to the east end. 



W. A.— Tex. 



The sketch indicates that two of the 

 houses are 40x120 feet and the other 

 40x136 feet. They are connected, with 

 three feet of glass and three feet of 



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