116 



The Florists^ Review 



JuM 15. 1922 



Greenhouse Heating 



Subscribers are invited to write the 

 editor of this department with regard to 

 any details of greenhouse heating that are 

 not understood. When information ia de- 

 sired regarding the capacity of boilers, or 

 the amount of radiation required for a 

 greenhouse, the needed temperatures 

 should b« 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. 



HEATINQ ONE HOUSE. 



I have one greenhouse 39x150 feet. 

 The distance to the ridge pole is tv^enty 

 feet. The house is divided into three 

 sections and the section on the west 

 end is to be kept at 55 degrees when the 

 outside temperature goes to 20 degrees 

 below zero, while the other two sec- 

 tions are to be kept at 45 degrees. I am 

 using a low-pressure steam boiler and 

 employ a night fireman. The house is 

 exposed on all sides, standing on a hill. 

 It is necessary for us to remove all of 

 our old pipes, as they are rusted 

 through. How much radiation will this 

 house require? What make of pipe do 

 you recommend t Is Byer's malleable 

 pipe worth the difference in pricef 



A. F. H.— Ia. 



The sketch shows that the ends of the 

 house are rounded, and that the walls 

 are six feet high, with three feet of 

 glass. It is inferred that there are 

 doors at each end and at the middle of 

 the sides of the house. The middle room 

 will require about 300 square feet of 

 radiation in addition to the mains. This 

 may be supplied by means of four coils 

 twenty feet long, each consisting of 

 seven 1%-inch pipes. In the west house 

 each coil should contain twelve pipes. 



The main flow should be a 3-inch pipe. 

 The coils on the south side of the middle 

 house may be supplied by a 2-inch main 

 carried under ground. The other coils 

 may be connected to 2%-inch flows, car- 

 ried on the plates in either direction 

 around to the ends of the houses. 



SIZE OF HEATEB NEEDED. 



Will you please tell me the size of 

 water heater which would be needed 

 in order to heat a greenhouse 25x50 feet 

 in size and containing 2,000 square feet 

 of glass? On one side there is a cement 

 wall four feet high and on the other 

 three sides there are cement walls three 

 feet high. I desire to heat the house to a 

 temperature of 50 degrees when there 

 is an outside temperature of 20 degrees 

 below zero. What size of pipe would 

 be best to use, considering the fact that 

 I plan to make an addition of about 

 fiftv feet later on? C. A. P.— Me. 



For the house described it would be 

 advisable to use a hot water heater 

 rated at about 950 square feet of radia- 

 tion and with a grate about twenty- 

 five inches in diameter. However, if it 

 is to be doubled in size within two or 

 three years, it will be advisable to 

 install at this time a heater which will 

 be able to handle the house after it 

 is enlarged. This will mean a heater 

 rated at about 1,700 square feet of 

 radiation. 



For the radiating surface, which will 



KROESCHELL 



''The Boiler of Unequaled Fuel EcoBomy" 



There is no other boiler that is as 

 efficient and economical as the 

 Kroeschell Greenhouse Boiler, 

 and that can be maintained with 

 as little trouble. 



There is no danger of cracking or 

 breakdown. There is no fuel 

 waste. Kroeschell Boilers burn 

 any kind of fuel, and they are 

 easy to clean. They can be op- 

 erated with the highest efficiency 

 with little effort and no worry. 



Kroeschell Boilers are used with 

 the greatest satisfaction every- 

 where, and are proudly praised 

 by the owners. You cannot get 

 away from it— the Kroeschell 

 Boiler is best in every way. 



EnKin«erinK Advice and Quota- 

 tions chearfully submittad- 

 Let us knaw yaur raquiramants 



KROESCHELL BROS. CO., 



444 W. Erie Street 



CHICAGO, ILL. 



