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118 



The PHorists^ Review 



4rBlL 22. !].930 



Greenhouse Heating 



BOILEB TOO SMAUj. 



I have two houses, one 16%x40 feet 

 and the other lO^^xllO feet. The first 

 house is nine and a half feet to the 

 ridge and has a 5 ^^ -foot northwest side 

 wall and a southeast side wall that is 

 two feet boarded up and four feet 

 glass. The glass lights are 10x12 inches. 

 The side benches are three feet wide 

 and the middle bench six feet five 

 inches. There are six 1%-inch flows and 

 six 1^-inch returns, six pipes under 

 each side bench, also one 2%-inch pipe 

 leading into the second house. The 

 second house is seven and a half feet 

 to the ridge and both side walls are 

 boarded up two and a half feet. The 

 glass lights on the southeast are 16x24 

 inches and on the northwest 10x12. 

 There is one solid bed, four and a half 

 feet wide, and one' high bench, two and 

 a half feet wide. The house has one 

 flow on each side under the gutter, one 

 return on the northwest side just above 

 the ground and two 1%-inch returns 

 on the southeast side. The pipes have 

 no shut-off. To keep the temperature 

 in this house at 45 degrees at night, the 

 first house registers 65 to 75 degrees. 



These houses are shady, having the 

 sun only four or five hours daily dur- 

 ing the winter. What would you rec- 

 ommend growing in these two houses f 



I use a No. 50 Spence hot water 

 heater. Is this boiler large enough to 

 heat three houses, one 16x110 feet, an- 

 other 12x110 feet and the third lO^x 

 110 feet? If not, what size of boiler 

 should be used? Would this Spence 

 boiler be large enough to heat two 

 houses, one 18x110 feet with two 2%- 

 inch flows and ten 1%-inch returns and 

 the other 20x110 feet with ten 1%-inch 

 pipes! How should I make the con- 

 nection? I plan to have three 4%-foot 

 solid beds. H. C. — Mass. 



The sizes of the flow pipes in the 

 narrow house are not stated, but, un- 

 less they are larger than 1^-inch, it 

 must be an exceedingly efficient heating 

 system if it will maintain a tempera- 

 ture of 45 degrees in zero weather 

 with three such returns. 



As I remember it, a No. 50 Spence 

 heater is rated for 950 square feet of 

 hot water radiation. The letter does 

 not state what temperature is to be 

 maintained in the three houses men- 

 tioned, nor is the amount of glass and 

 board surface in the walls stated. But 

 even if there is no exposed wall sur- 

 face, it would require about 1,150 

 square feet of radiation to heat these 

 houses to 50 degrees, which is over 

 one-fifth more than can be handled 

 by a No. 50 Spence boiler. If the houses 

 are to be heated to 60 degrees, about 

 1,500 square feet of radiation will be 

 required, and allowance will still need to 

 be made for any exposed wall surface. 

 At least 100 square feet of radiation 

 additional will be needed for each foot 

 of glass in the two side walls. 



The two houses described would re- 

 quire about the same radiation as the 

 three narrower houses. The Spence 

 boiler is about large enough to heat 

 one of these houses to 60 degrees, if 

 the No. 50 boiler has a grate about 

 twenty-five inches in diameter and five 

 horizontal sections. 



It is not clear what is meant by 



KROESCHELL 



GREENHOUSE SPECIALTIES 



NOT 



CAST 



IRON 



Blad* In 20 Sises 



HEATING and (XKDLING arr two branches of engineeru.K on 

 irideh we specialiM for th« greenhoase trade. 



Over thirty years have been devoted bv us to the construction 

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Tubeleas Boiler 



KROESCHELL Boilers are making the most wonderful green- 

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VATCMTCO ••■* 



BOILER- 



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13,468,520 sq. ft. of glass was equipped with KROESCHELL 

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 CHICAGO, ILL. 



