■/.•■, 



116 



The Florists^ Review 



Mat 27, 1920. 



Greenhouse Heating 



SuBSGRiBKBS are invited to write the 

 editor of this department with regard to 

 anj 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. 



CIRCULATION WITHOUT PUMP. 



I am building a greenhouse, 40x100 

 feet, with two feet of concrete and 

 four feet of glass in the side walls and 

 both ends of glass. It is sixteen feet 

 high at the gables. I should like to 

 maintain a heat of 60 degrees when it 

 is 20 degrees below zero. I shall use 

 2-inch pipe for coils. What size of boiler 

 should I use? I shall use soft coal. 

 Would you advise using a pump or cir- 

 culating machine to get quick circula- 

 tion! G. Mc— Can. 



To heat a greenhouse 40x100 feet to 

 60 degrees under the severe conditions 

 stated, use a boiler rated for about 

 8,500 to 9,000 square feet of glass or 

 2,800 to 3,000 square feet of radiation. 

 It should have a grate with at least 

 eight square feet of surface and nine 

 feet would be even better. This will 

 require a chimney fifteen inches in 

 diameter and thirty-two to thirty six 

 feet high, measuring from the point 

 where the smoke pipe enters. 



For a house 100 feet in length, a good 

 circulation can be secured without the 

 use of a pump, provided the top of the 

 boiler is below the level of the green- 

 house floor. 



There should be either two 4-inch flow 

 pipes or one 6-inch and the returns 

 should be of the same capacity. One 

 6-inch flow pipe and two 4 inch returns 

 would be a good combination. 



For the radiating surface use seven 

 2M.-inch flow pipes, placing one upon 

 each plate, another three or four feet 

 below the ridge and the others on the 

 purlin posts. Each of the seven flow 

 pipes should supply a coil of four 2- 

 inch returns. The outside coils may be 

 cither on the side walls or under the 

 side benches, if they are next to the 

 walls, and the other coils may be dis- 

 tributed under the other benches. The 

 flows, as well as the return ])il>es, should 

 have a slight fall, but this should only 

 be sufficient to keep the air from pock- 

 eting. With this arrangement ami with 

 the expansion tank connected with the 

 highest points in the flow pii)eH, there 

 will be no occasion for using air valves. 



BOILER TUBES AS FLOWS. 



I have a range of five connected 

 greenhouses, each 14x80 feet. The 

 height is seven feet to the eaves. The 

 side walls are two and a half feet of 

 cement and four and a half feet of 

 glass, as shown in the sketch I am 

 sending you. What horsepower boiler 

 would be correct for steam heat? 

 What is correct for hot water heat! 

 How many 4-inch boiler flues should 

 be used in the heating system? Is 

 it better to have the Ifsating pipes 



WHIN YOU BUY-aiT A KROKSCHILL 

 ■THI BOILER OF UNCQUALED FUEL ECONOMY" 



<>tai.t'*'2k22? 



The immense amount of direct self -cleaning heatinsr surface and 

 the thin vertical waterways cause this type of boiler construction 

 to heat water quicker than any other form of boiler. 



Hundreds of Florists' Review readers are using the 

 Kroeschell Boiler and mighty is their praise. The 

 year of 1920 has brought us an enormous number of 

 new customers who have seen our boiler in operation 

 at other places. We attribute the large sales of this 

 season to the good work the Kroeschell Boiler is doing 

 everywhere. With our policy — "the customers' interest 

 first"'— perfection of construction — factory to user prices 

 — honest and "true blue" boiler ratings— you simply 

 cannot lose. 



PLACE YOUR ORDER- DO IT TODAY 

 TELEPHONE OR TELEGRAPH AT OUR EXPENSE 



KROESCHELL BROS. CO., 



444 W. Erie Stroot 

 CHICAGO, ILL. 



