Handbook for heating and ventilating engineers . ed by direct radiation and by air convection cur-rents through the radiators, no provision being made for achange of air in the room. This is known as the directsystem, and, while it causes movements of the air in theroom, it produces no real ventilation. See Fig. 30. Ivi the direct-indirect system, the radiator is alsoplaced within the space or room to be heated, but its lowerhalf is so encased and connected to the outside of the build- 88 HEATING AND VENTILATION Ing- that fresh air is continually drawn up through theradiator, is heated, and th
Handbook for heating and ventilating engineers . ed by direct radiation and by air convection cur-rents through the radiators, no provision being made for achange of air in the room. This is known as the directsystem, and, while it causes movements of the air in theroom, it produces no real ventilation. See Fig. 30. Ivi the direct-indirect system, the radiator is alsoplaced within the space or room to be heated, but its lowerhalf is so encased and connected to the outside of the build- 88 HEATING AND VENTILATION Ing- that fresh air is continually drawn up through theradiator, is heated, and thrown out into the room as shownby Fig-. 31, Thus is es-tablished a ventilating system moreor less effective. In the purely indireci si/sfem. Fig. 32. the radiating sur-face is erected somewhere remote from the rooms to beheated, and ducts carry the heated air from the radiatorto the rooms either by natural convection, as in some in-stallations, or by fan or blower pressure, as in all the radiation for an entire building is installed. Fig. 32. together in one basement room, and each room of the buildiiig has carried to it, its share of heat by forced air througliducts from one large centralized fan or blower, the systemis called a Plenum System, and is given special considerationin Chapters X to XII. 65. A second classification of steam and hot water sys-tems is made according to the method of pipe connectionbetween the heat generator and the radiation. That knownas the one-pipe system, Fig. 33, is the simplest in construc-tion and is preferred by many for the steam the name indicates, its distinguishing feature is thesingle pipe leading from the source of heat to the radiator,the steam and the returning condensation both using thispath. In the risers and connections, the steam and ton-densation flow in opposite directions, thus requiring largerpipes than where a flow and a return are both this system the condensation usually flows with t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
