88 



The Florists' Review 



JdJ<Y 28, 1914. 



want a temperature of 60 degrees at 

 the boiler end of the house and 50 de- 

 grees in the other part. The location 

 is the eastern part of Washington state. 



L. H. 



There is nothing in the letter of in- 

 quiry which gives any idea of the cause 

 of the trouble with the present heating 

 system. Ordinarily, when the boiler is 

 so located that it is entirely below the 

 level of the return pipes, there is no dif- 

 ficulty about securing a circulation. The 

 usual outside temperature is not given, 

 but as there are few points in eastern 

 Washington where the mercury drops 

 to zero I shall consider that to be the 

 minimum temperature. The amount of 

 radiation now in the house should give 

 a temperature of 50 degrees, but it is 

 possible that the arrangement is such 

 that the flow pipes are overtaxed, or 

 that the top of the heater is above the 

 level of the returns. 



I would advise the use of three 2*^- 

 inch flow pipes, placing one upon each 

 wall plate and the other two feet below 

 the ridge. At the south end of the house 

 connect the flow pipes with six 2-inch 

 returns, arranged in three coils under 

 the benches. This will be sufficient for 

 50 de^ees, and for 60 degrees use two 

 additional returns under the middle 

 bench. These should be connected with 

 the middle flow pipe by means of a 2- 

 inch pipe dropped down from the main 

 near the partition. Unless the top of the 

 boiler is below the level of the returns, 

 I would suggest the use of some kind of 

 mercury generator, by which it will be 

 possible to raise the boiling point of 

 the water and thus help the circulation. 

 This can be added at any time, as it is 

 connected to the pipe leading to the 

 expansion tank. 



FOOB DEATT. 



I wish to get a little information in 

 regard to my greenhouse chimney. It is 

 thirty-six feet high from where the 

 smoke pipe enters. The opening is 14 x 

 18 inches. The grate surface of the 

 boiler is 2 x 5 feet. The chimney gives 

 me a back draft at times and I have 

 found it necessary to use a forced draft 

 at all times; that is to say, with the ash 

 pit door opened. This causes a waste of 

 fuel and I wish to correct the trouble. 

 There is no building near to interfere 

 with the draft. Will you kindly let me 

 know how much higher it would be nec- 

 essary to build the chimney to get good 

 results f F« C. J. 



From the data given I am not able 

 to determine .lust what causes the diffi- 

 culty. The chimney is twenty-five per 

 cent larger in cross section than is gen- 

 erally used for ten square feet of grate» 

 While a slightly greater height would 

 doubtless improve the draft, it would 

 be advisable not to make the change 

 until you have examined the boiler care- 

 fully to ascertain whether ther^is some- 

 thing either about the boiler itself or 

 its connection with the chimney which 

 would account for the poor draft. 



Of course the size of the chimney 

 should depend to some extent upon the 

 kind of fuel, the size of the openings 

 in the grate bars and the connection 

 of the boiler with the chimney. For the 

 smoke flue connecting the boiler with 

 the chimney, I would want a diameter 

 of fourteen inches for a grate and stack 

 of the size mentioned. Although it 

 would not seem necessary to have a 

 chimney any higher than thirty-six feet. 



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