. Florists' review [microform]. Floriculture. i«"»U""if V'-'V.' iiiJijii^'i vv^ 132 The Florists^ Review Ueckmbku 21. 1U22 of anthracite coal are burned, and they advise the use of a boiler one size larger for use with soft coal. What a boiler will do when soft coal is used itaay be considerably less than when hard coal is used, depending, of course, on the grade of coal and the skill of the fireman. It is generally ad- visable, when burning soft coal, to limit the radiation to sixty per cent of the rating of the boiler. FIGURINQ RADIATION. We have a Wilks boiler twenty
. Florists' review [microform]. Floriculture. i«"»U""if V'-'V.' iiiJijii^'i vv^ 132 The Florists^ Review Ueckmbku 21. 1U22 of anthracite coal are burned, and they advise the use of a boiler one size larger for use with soft coal. What a boiler will do when soft coal is used itaay be considerably less than when hard coal is used, depending, of course, on the grade of coal and the skill of the fireman. It is generally ad- visable, when burning soft coal, to limit the radiation to sixty per cent of the rating of the boiler. FIGURINQ RADIATION. We have a Wilks boiler twenty-four inches in diameter, four feet high above the base. This boiler contains a circu- lar grate nineteen inches in diameter, a steel furnace twenty-one inches in diam- eter at the bottom, tapering to sixteen inches ^t the top; it has two 2-inch flows on the top and six 2-inch returns at the bottom. We should like to know what size of greenhouse a boiler of this size will heat to a temperature of 55 or 60 degrees. This boiler has a 6-inch opening for the smokestack at the top. This is a hot water boiler. C. B. W.—O. It is customary to estimate the rat- ing of a hot water boiler, with a grate nineteen or twenty inches in diameter, at about 450 square feet of radiation, with hard coal as the fuel. This makes no allowance for the returns which do not supply radiating surface, or for a margin in the performance of the boiler, and the actual radiation which such a boiler should be expected to handle is from one-fourth to one-third less than the rating given above. If the boiler is to bo used with a good grade of egg- sized bituminous coal, it will be well to reduce the radiation to nearly one-half, or to 225 to 250 square feet. For a greenhouse to be heated to 60 degrees in zero weather, it is customary to estimate that one square foot of hot water radiation will provide heat for three square feet of glass. On this basis the boiler described should heat a green- house thirty-two
Size: 1497px × 1670px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecad, booksubjectfloriculture, bookyear1912
