94 



The Florists^ Review 



FUBBOASY 13, 1919. 



Greenhouse Heating 



SuBSCRiBEKS are invited to write the 

 Editor of this Department with regard to 

 any 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. 



HEATING WITH EXHAUST STEAM. 



Is it practicable to heat a greenhouse 

 with exhaust steam t I can arrange 

 to secure steam from a 'power plant 

 which would give me continuous, day 

 and night service. The power plant 

 comprises a 90-hor8epower engine, with 

 two boilers, of 100 and 150 horsepower, 

 respectively. The exhaust is now going 

 to waste. What would be the value of 

 the water returned to the plant, to be 

 used again? F. J. A. — Neb. 



It is not only practicable, but it is 

 often profitable to heat a greenhouse 

 with exhaust steam, where regular serv- 

 ice can be secured. There are also many 

 advantages, among which are the les- 

 sening of the danger of fire, the relief 

 from the labor of firing and the removal 

 of the cinders, and the securing of 

 greater regularity in the heating. 



A flat rate per thousand square feet 

 of glass or of radiation is sometimes 

 given, but the cost of heating varies so 

 much in different years, and according 

 to the condition of the glazing and the 

 character of the exposure, that no gen- 

 eral estimate can be given on this basis. 

 The method of determining the charge 

 for heating used by most central heat- 

 ing plants is to base it upon the weight 

 of the condensed water which is re- 

 turned from the greenhouse coils, de- 

 termined by a self-registering condensa- 

 tion meter. 



The exact amount charged for the 

 service varies with the cost of fuel at 

 the given point, as well as with the 

 amount of steam used. Thus, where 

 fuel is cheap and where a large amount 

 of steam is required, the charge may 

 be as low as 40 or 45 cents per thousand 

 pounds of condensation. On the other 

 hand, the charge may be as much as 75 

 or 80 cents per thousand pounds of 

 condensation where the cost of coal is 

 high and the greenhouse space is small. 

 In some sections it may be even more 

 than this. There has been an advance 

 of more than fifty per cent in the 

 charges during the last two years, owing 

 to the war prices of fuel. Ordinarily, 

 the party owning the heating plant 

 makes the connection, charging nothing 

 for piping to the curb line, and asking 

 the actual cost for labor and material 

 for connecting with the steam mains 

 inside the greenhouse. 



If there is a small and, preferably, 

 a cool house located at a lower level 

 than the others, it is often advisable 

 to put in "economy coils," through 

 which the condensed water will circu- 

 late before going back to the heating 

 plant. In this way the eflBciency of the 

 steam can be increased fully ten per 

 cent. 



When it is possible to carry the con- 

 densation back to the heating plant at 



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WHEN YOU BUY GET A KROESCHELL 

 "THE BOILER OF UNEQUALED FUEL ECONOMY" 



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Neither in the East or West, nor the North or South has any other 

 make off boiler ever equaled the performance of the Kroeschell— 

 installed for 3,974,605 square feet of glass in 1916-1917. Every 

 customer immensely satisfied. The hish efficiency and low cost off 

 operation make the Kroeschell the best of all boilers for Florists' use. 



KROESCHELL BOILERS have satis- 

 factorily and permanently solved the 

 effective burning of screenings. They 

 will burn the worst srrades of coal, even 

 the dirtiest culm or sawdust and wood 

 refuse. 



Greenhouse owners like the (KROES- 

 CHELL because of its extreme simplic- 

 ity and freedom from trouble. As a fuel 

 saver, it pays its own way. The KROES- 

 CHELL will increase your heating plant 

 efficiency 20 to 40%. 



The KROESCHELL has proven its worth in many of the large establish- 

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 and caBacity are completely beyond any other boiler. 



ORDER YOUR BOILER NOW 



Building has been suspended during the war, but it 

 will boom soon to make up for lost time, We 

 believe that building materials, INCLUDING 

 BOILERS, can be bought cheaper now than later, 

 after the building boom gets under way. 



KROESCHELL BROS. CO., 



444 W. Erie Street, 

 CHICAGO, ILL. . 



onoan anDonaDDDooDODaaaaaa 



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