114 



The Florists^ Review October 30, 1919. 



Greenhouse Heating 



COST OF PURCHASED HEAT. 



Please tell me what would be a fair 

 price to pay for heat. I have a con- 

 densed water meter which shows that I 

 have used 328,792 pounds of water. The 

 heating plant had to pay $8 per ton for 

 coal. They claim they have an up-to- 

 date system and do not care to make 

 much profit, as it is owned by the state, 

 and they want to get rid of the smoke 

 from the greenhouse. They have charged 

 me $966.99, which I think is too much 

 for less than five months' heat. 



J. W.— Wis. 



The cost of commercial heating from 

 central sources varies in different sec- 

 tions according to the cost of coal and 

 the economy of the system. The range 

 is from 60 cents to $1 per 1,000 pounds 

 of condensed water. 



I know of one central heating plant 

 which burns slack coal with a self-stok- 

 ing boiler and, of course, has fixed a 

 price supposed to yield a profit. The 

 charge was formerly 60 cents per 1,000 

 pounds of water, but since the increase 

 in the cost of coal, labor, etc., it has 

 been raised to 80 cents per 1,000 pounds 

 to consumers using less than 200,000 

 pounds of water monthly. If this com- 

 pany can take care of the overhead ex- 

 pense and depreciation of the plant and 

 still mal^ a profit, it would seem that, 

 even thtSugh the cost of the coal may be 

 slightly more, if no profit is expected 

 the rate should be no higher than that 

 which I have mentioned. 



HEATING HOUSES AND FRAMES. 



Please tell me the size of hot water 

 boiler and the amount, size and arrange- 

 ment of pipes to heat two greenhouses 

 and four coldframes. They are all on 

 the south side of the dwelling. I want 

 to repipe the old house to grow roses. 

 It is 14x40 feet, has a 9-foot ridge and 

 4-foot walls without any glass in them. 

 The proposed new house, 17x60, running 

 north and south, has wooden walla with 

 sixteen inches of glass; the north end is 

 wood to the top and the south end has 

 four feet of wood and the rest glass; the 

 house has a 12-foot ridge. The cold- 

 frames are each 6x40 feet, with four 

 inches of wood in the south side and 

 eight inches in the north side; two are 

 covered with double-glazed sash and two 

 with singlo-glazed sash. The new house 

 is to be kept at 60 degrees to grow lilies 

 and carnations. The average winter 

 temperature is zero. 



J. P. & F. C— Tcnn. 



To maintain a temperature of 60 de- 

 grees in the greenhouses and 40 degrees 

 in the frames, it will be advisable to in- 

 stall a boiler rated for about 1,000 

 square feet. Such a boiler should have 

 a grate about twenty-five inches in 

 diameter. 



For the house 17x60 feet, I should 

 use three 2^^-inch flow pipes and nine 

 2-inch returns. In the other house, two 

 2%-inch flows and seven 2-inch returns 

 will answer or two 2-inch flows and nine 

 or ten 1%-inch returns may be used. To 

 heat the coldframes, a 2-inch pipe may 

 be run around three sides of each bed. 



Two flow pipes may be placed on the 

 walls or wall plate, with the third flow 

 a foot or two below the ridge in the 

 wider house. Distribute the returns un- 



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