

120 



Tht Florists' Review 



NOTBMBBB 4. 1920 



Greenhouse Heating 



SxTBsaaiBEas are invited to write the 

 editor of thie 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. 



OBSTBUCTED CIBClTIiATION. 



I am having trouble with my heating 

 system. I have an Ideal boiler, with 

 900 feet of radiation. A 5-inch flow 

 pipe, twelve feet long, is connected wdth 

 the boiler and ends in a 5-inch tee in the 

 greenhouse. To one side of this tee is 

 attached a 2-inch flow pipe, which feeds 

 the coil marked 1 in the accompanying 

 diagram. From the other side of the tee 

 a 3-inch flow runs four feet to coil 2 and 

 then is reduced to 2-inch to feed coil 3. 

 Coil 1 has a separate 2-inch return to the 

 boiler. Coil 3 returns to coil 2 with a 

 2-inch pipe; then 2 and 3 connect in a 

 3-inch pipe running back to the boiler. 

 All returns, at the discharging end, are 

 one foot above the top of the boiler. 

 The coils are fifty feet long and there 

 are four 1%-inch returns in each coil. 

 The flows and returns, which are all 

 under benches, slant uphill eighteen 

 inches in the fifty feet and return the 

 same way. 



In firing the boiler, I find that coil 1, 

 on the north side, heats rapidly and the 

 returns work extra well. The flows for 

 coils 2 and 3 heat quickly, but the re- 

 turns refuse to act. Thinking the re- 

 turns were stopped up, I took them 

 apart, but found nothing wrong. There 

 are no sags or air pockets. The shutting 

 off of coil 1 makes no difference. The 

 least fire in the boiler runs the water up 

 to 200 degrees. The flow pipes on coils 

 2 and 3 become intensely hot all the way 

 to the header at the farther end, but 

 there is no return. 



Why does coil 1 work and the others 

 refuse to do sol I have drawn off all 

 the water three times and filled again, 

 but this does no good. C. F. P. — Kan. 



From the foregoing inquiry and the 

 accompanying sketch, it appears that 

 the arrangement of the three coils is 

 practically identical. The iBow pipes are 

 of the same size; the coils each consist 

 of four l^/^-inch pipes, fifty feet long, 

 and each coil has a 2-inch return. The 

 flow pipes run- uphill and this necessi- 

 tates an air valve at the upper end. If 

 these valves have been overlooked in 

 coils 2 and 3, or if care has not been 

 taken to free them from the air, the flows 

 would not fill. It is not really probable, 

 however, that this is the cause of the 

 trouble, as the pipes evidently fill with 

 water, although the heat reported in the 

 pipes might be due to steam. 



If air valves have been installed and 

 the coils have filled with water, the 

 trouble would be due to some obstruc- 

 tion which prevents the return of the 

 water to the boiler. It is possible, but 

 hardly likely, that there is some ob- 

 struction in the return mains. If there 

 are no valves that have not been opened, 

 there seem to be but two causes to 



*'Ain*t it a Grand and doriou* Fmmling?'* 



Heat Your Houses with 

 Kroeschell Boilers 



YOU'LL 

 YOU'LL 



HAPPIER 

 RICHER 



TO THK MAN WHO NEEDS A BOILER 



"The customer'! interest flrst"-is the basis of the KROESCHELL standard. This 

 principle makes the KROESCHELL Policy the most liberal of all in the Green- 

 house Boiler business. The great variety of boilers that we make places ns in a 

 commanding position. It is the KROESCHELL principle to supply only the type 

 of boiler best suited for the conditions. For this reason we always famish the 

 most efficient boiler unit in every case. 



CAN SHIP 

 ANY SIZE 

 AT ONCE 



NOT 



CAST 



IRON 



NOT 

 CAST 

 IRON 



TEUCQRAPH 



ORDERS AT 



OUR EXPENSE 



The KROESCHELL has proven its woi'th in many of the large establishments in 

 this country. It has freauently been selected by the most careful buyers in 

 competition with all other types of boilers. Its efficiency and capacity are com- 

 pletely beyond any other boiler. 



. KROESCHELL BOILERS have no bulky, soot accumu- 

 lating surfaces— you avoid the disagreeable work and 

 trouble indispensable to cleaning boilers with compli- 

 cated and tortuous back and forth passages. 



The superiority of our boilers has resulted in the removal and abolishment of 

 hundreds of cast iron sectional boilers— in every instance KROESCHELL BOILERS 

 give more heat with the same piping with lesrf fuel. 



WHEN YOU BUY-OET A KROESCHELL 



KROESCHELL BROS. CO., 



444 W. Eri* Str«4t 

 CHICAGO, ILL. 



