114 



The Florists^ Review 



Jolt 29. 1920 



Greenhouse Heating 



SirBSCRiBEBS 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, tiie needed temperatures 

 should be stated in the inquiry, as well 

 as the amount of glass in tiie side walls, 

 and the dimensions and general arrange- 

 ment of the greenhouses. It is often help- 

 fill, also, to have a sketch showing the 

 location of the houses. 



NEED OF OIBCXTI1A.TOB. 



The bottom of my boiler is two feet 

 below the level of the greenhouse floor 

 and a 4-inch pipe leads out of the boiler 

 and through the boiler room and goes 

 around both sides of the house, one 

 under the eaves and one on the purlins. 

 The house is five feet to the eaves and 

 ten feet to the ridge. There is eighteen 

 inches of glass in the side walls. There 

 is a fall of one inch for every fifteen 

 feet, but I can not keep a temperature 

 of 60 degrees. What can I do about itt 

 Where can I get a mercury circulator t 



N. McD. — ^Kan. 



The circulation of the water in a hot 

 water heating system depends more 

 upon the height of the returns above 

 the boiler than upon the slope of the 

 pipes, which need only be sufficient to 

 free them of air. From the foregoing 

 it is judged that the returns are not 

 much over one foot above the grate 

 and, as has been previously advised, 

 if they cannot be raised it will be neces- 

 sary to put on a mercury circulator. 

 This can be obtained from the boiler 

 manufacturers who advertise in The 

 Review. Whether or not the circulator 

 is used, the flow pipes, as well as the 

 returns, should have a slight fall. If 

 they run uphill this would largely ac- 

 count for the failure to secure good re- 

 sults. 



HEATINQ CONSEEVATOBY. 



We are building a greenhouse and a 

 conservatory, as shown in the sketch 

 I am sending you. I wish to maintain 

 a temperature of 55 to 60 degrees in 

 the greenhouse when the outside tem- 

 perature is 30 degrees above zero. There 

 are no posts in the conservatory, the 

 roof being supported by bridgework. 

 There are no benches in it, but there is 

 a rockery at one end, which will pre- 

 vent laying the pipes all around the 

 house. How many 2 and 2^/^ -inch pipes 

 will be needed for flows and returns t 

 What size of boiler will be required, 

 using oil for fuel? Would a tubular or 

 sectional boiler be better or can you 

 recommend a special heating system for 

 burning oil ? F. W. — Cal. 



From the sketch it is learned that the 

 conservatory is 26x28 feet, with two of 

 the corners cut away, thus giving it an 

 octagon cflFeot at one end. The walls 

 are of cement, three feet high, with five 

 and a half feet of glass, except one end 

 wall, which is of concrete to the height 

 of eight and one-half feet. One side 

 wall is protected by the north end of the 

 greenhouse. The boiler house is at the 

 northeast end of the conservatory. The 

 rockery is located against the west wall. 

 If it could be eighteen inches away 



THE KROESCHELL 



HOT WATER BOILER 



Here is the boiler that is makins the moit wonderful greenhouse 

 heating record in the world. Florists and gardeners who have 

 used other makes are constantly giving the KROESCHELL 

 Greenhouse Boiler the highest praise. 



8,974,606 sQuare feet of glass was equipped with KROESCHELL 

 Boilers during 1916-1917. You will find the KROESCHELL in 

 every State ia the Union and Canada. The supremacy of KROE- 

 SCHELL Boilers is proved by their country -wide adoption. 



Every boiler made at our works is of the highest standard. Ma- 

 terial—governed by Kroesthell specifications— the best that 

 money and brains can produce. Worhmanship— the kind that is 

 an inspiration to all boiler makers. Boiler eflSciency— deter- 

 mined by actual tests under working conditions. Boiler ratings 

 — honest and true blue — guaranteed actual working capacities. 



The superiority of our boilers has resulted in the removal and 

 abolishment of hundreds of sectional cast-iron boilers. In every 

 instance KROESCHELL BOILERS give more heat with the same 

 piping and with less fuel. 



WHEN YOU BUY -OCT A KROESCHELL 



KROESCHELL BROS. CO., 



444 W. Erie Street 

 CHICAGO, ILL. 



