130 



The Florists' Review 



Fkuulaiiv 10, 1921 



Greenhouse Heating 



SoBSCRiBERS 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. 



CLEANING BOILERS. 



Reduces Coal Bill. 



An important question in proper heat- 

 ing from a technical viewpoint was ably 

 treated in a papor jtrosonted by William 

 R. Van Xortwii'k, of tlie Roto Co., at a 

 gathering oi onjiineers at a recent chem- 

 ical show in New York city. After re- 

 ferring to tilt' constant experiments go- 

 ing on to cut down the waste of heat 

 units, he gave the following suggestions 

 on cutting down heating cost by keeping 

 boilers i-lean: 



'■ ' The ideal design of a steam gener- 

 ator would bn one in which the fire could 

 conic in direct contact with the water, 

 with no wall of metal between. Of 

 course this is impossilile, and we are com- 

 jxdled to interpose the wall of metal 

 between the fire and the water.- Great 

 pains have been taken to reduce this 

 wall to its smallest possible thickness 

 with a iiiaximmn conductivity. How- 

 ever, the o}>eration of the boiler tends to 

 decrease tlu' ability of the boiler to 

 transmit the heat units from the fire to 

 the water, with a constant decrease in 

 ftficiency and increase in fuel consump- 

 tion to accomplish a given result. This 

 is due to the soot deposited on the tubes 

 from the fire .aiKl llie scale deposited 

 from the water. 



Soot Produced. 



"The fuel in burning produces a fine 

 soot or ash, whicli, carried by the draft, 

 finds lodgment on the top of the tubes of 

 ,'i water tulie Vioikr or in the flues of a 

 fire tube boiler. It is strange that pro- 

 gressive engineers failed for so many 

 years to realize that this soot retardetl, 

 more or less etfectnally, the transference 

 of heat to the water. It is only in com- 

 paratively late years that any mechan- 

 ism has been developed for mechanically 

 blowing this soot from the tubes. 



•'The ideal feed water would, of 

 course, be one which was neither acid 

 nor alkaline and which contained no 

 traces of the earth salts. However, 

 those waters which do not contain scale- 

 forming material invariably carry mate- 

 rial which will pit or corrode the tube. 

 While it is not the intention of this 

 paper to enter into an extended discus- 

 sion of corrosion and pitting of the 

 boiler metal, it is worthy of note that 

 this action is far more serious than is 

 the aeciiinulation of scale. It cannot be 

 easily detected and, if not taken in time, 

 ultimately lends to ruptures in the boiler. 



Discusses Cures. 



"It might be well to note in passing, 

 however, that the usual cure for this type 

 of boiler trouble is to add some scale- 

 forming material to the feed water, such 

 as carbonate of soda. While there are 



WHEN YOU BUY-OET A KROE8CHELL 

 "THE BOILER OF UNEQUALED FUEL ECONOMY" 



<>V^«1r 



The immense amount of direct self- cleaning^ heating: surface 

 and the thin vertical waterways cause this type of boiler con- 

 struction 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 cus- 

 tomers 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" — per- 

 fection 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 Street 

 CHICAGO, ILL. 



