92 



The Florists^ Review 



February 15, 1917. 



H. H. UNEAWEAVBt & CO., Inc. 



«"".r" e O ik I 



imiMINOUS %# \^ #% ■■ 



Weit End Trust Building, PHILADELPHIA 



17 Battery Place, NEW TORE 

 Watting Building, LEBANON. PA. 



Greenhouse Heating. 



Subscribers are invited to write the 

 Editor of this Department with regard to 

 any details of greenhouse heating that 

 are not understood. But please do not 

 ask The Eeview to make a choice of ap- 

 paratus for you. The greenhouse heating 

 equipment advertised in this paper is, we 

 believe, the best for the trade to buy, 

 and each article the best in the special 

 field of its adaptation. 



HAS PIPE ON HAND. 



I intend to build a small greenhouse 

 and should like to get your advice about 

 the piping. Tlie house will run north 

 and south and will be 13%x25. It will 

 be eight and one-half feet high to the 

 ridge. The side walls will be four feet 

 high, with two feet of glass in each 

 wall. The south gable will be glass. 

 The remainder of the walls will be of 

 matched lumber. What piping will be 

 needed to heat this house to 60 degrees 

 when the outdoor temperature is 16 de- 

 grees below zero? I have some 2-inch 

 and 21^-inch pipe on hand. Could I 

 use 2-inch flows with li/{.-inch returns, 

 and how many of each would be needed? 



D. V. P.— Minn. 



There are various combinations of 

 the pipe mentioned tliat could be used 

 in the house described. If there are 

 three benclies in tlie liouse, we would 

 use three 2-inch flow pipes, placing one 

 upon each plate and the other about 

 one foot below the ridge, and would 

 connect each of them with a coil of 

 l^/^-inch pipes under the corresponding 

 bencli. Five pipes may be used under 

 each of the side benches and three in 

 the coil under tlie middle bench. 



Another method of piping would be 

 to use a 2%-inch flow pipe upon each 

 plate and connect each flow pipe with 

 either six 2-inch or eight l^^-inch re- 

 turns. 



The flow and return pipes should have 

 a fall of one inch in ten or twelve feet 

 and tlio expansion tank should be con- 

 nected with the highest part of the 

 system. 



A HOUSE WITH A PROJECTION. 



I am building a new greenhouse, IS^/^x 

 100 and twelve feet to the ridge, with a 

 projection 8%x21. There will be four 

 feet of glass in one side. The old house 

 adjoining is 27x100 and is heated by 

 fourteen S^^-inch cast-iron pipes. It 

 has five open tanks. I shall use the 

 same boilers to heat both houses. The 

 pipes will have a rise of one and one- 

 half feet in 100 feet. 



I have been told that it would be 

 much cheaper and just as effective' to 

 use 2-inch pipe instead of expensive 

 3%-inch cast-iron pipe. I have also been 

 told that it will not be necessary to buy 

 an expansion tank and that only one 

 automatic air valve will be needed. Is 

 this correct? How many flows and re- 

 turns will be required to heat the 

 warmer end of the house, the forcing 



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 Mention The Review when yon write. 



house, 8%x21, to a temperature of 60 

 degrees or more when the outside tem- 

 perature is at zero? What piping will 

 be required to heat the rest of the 

 house, 131/^x100, to 55 degrees? I have 

 not had any experience with pipe 

 smaller than S'^.-inoh. E. J. H. 



To heat a greenhouse IS^^xlOO to a 

 temperature of 55 degrees in zero 

 weather, when there are four feet of 

 glass in one side wall, we would use two 



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2 14 -inch flow pipes, carried on the wall 



plates. Or, if coils are desired under the 

 middle bench, we would use three 2-incli 

 flow pipes, placing the third pipe a foot 

 or so below the ridge. In either case we 

 would install six 2-inch returns. If two 

 flow pipes are used, we would place three 

 returns under each side bench. If three 

 flow pipes are used, there should be 

 two pipes under each of the three 

 benches. For the propagating house, 

 81^x21, we would run one 2-inch flow 



