Mechanical Equipment of Buildings; A Reference Book for Engineers and Architects Volume 1
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...are accompanied by the generation of heat from within. The blood serves to carry oxygen from the lungs to remote tissues, where combustion takes place, and COa is carried back and eliminated by the lungs in respiration. As a result an average normal temperature of 98.6 F. is maintained, and a constant but not too rapid radiation of heat must be kept up if the individual is to remain comfortable. Hence it appears that the only function of external warming is to reduce the rapdity with which the body parts with or gives off its heat. An average adult must dissipate about 400 B.t.u. per hour for comfort, of which about 30 per cent is lost by contact with the air, 43 per cent by radiation and 27 per cent by exhalation and other means. Air, if dry, is a nearly perfect non-conductor but allows radiation to take place through it readily, hence in a room with very dry air at 75 a person may feel cold if walls are at 50, due to the radiation loss from the body to the cold wall surfaces. It is desirable to maintain a normal rate of heat loss if comfort is to be had, and surrounding air and wall temperatures ranging from 67-72 F., depending on quietness of air, are found desirable. TABLE 7 HEAT AND WATER VAPOR GIVEN OFF BY PEOPLE The general effect of respiration on the air of inhabited rooms is given in the following extract from an article by Chas. R. Honibal, Engineering Review: "The accompanying tables, obtained from results of experiments, represent the average of a very large number of observations on the air of inhabited rooms. The method employed ffi judging the quality of the air was to enter directly from the open air into the room in which tit air was to be judged, after having been at least 15 minutes in the open air. It will be...
- Paperback | 186 pages
- 189 x 246 x 10mm | 340g
- 13 Sep 2013
- Illustrations, black and white