Cyclopedia of heating, plumbing and sanitation; a complete reference work . PAUL SYSTEM OF HEAT IN* Fig. 133. Showing General Method of Making Pipe ancTRadiator Connections in Paul System. be somewhat increased in size, owing to the lower temperature ofthe steam. It is common practice to add from 20 to 30 per cent tothe sizes required for low-pressure live steam. 156 HEATING AND VENTILATION 14? FORCED BLAST In a system of forced circulation by means of a fan or blowerthe action is positive and practically constant under all usual con-ditions of outside temperature and wind action. This gives i
Cyclopedia of heating, plumbing and sanitation; a complete reference work . PAUL SYSTEM OF HEAT IN* Fig. 133. Showing General Method of Making Pipe ancTRadiator Connections in Paul System. be somewhat increased in size, owing to the lower temperature ofthe steam. It is common practice to add from 20 to 30 per cent tothe sizes required for low-pressure live steam. 156 HEATING AND VENTILATION 14? FORCED BLAST In a system of forced circulation by means of a fan or blowerthe action is positive and practically constant under all usual con-ditions of outside temperature and wind action. This gives it adecided advantage over natural or gravity methods, which are af-A A. Fig. 134. Details of Connections at Exhauster, Paul System. fected to a greater or less degree by changes in wind-pressure, and makes it especially adapted to the ventilation and warming of largebuildings such as shops, factories, schools, churches, halls, theaters,etc., where large and definite air-quantities are required. Exhaust Method. This consists in drawing the air out of abuilding, and providing for the heat thus carried away by placing 157 its HEATING AND VKXTILATTON steam coils under windows or in other positions where the inwardleakage is supposed t be the greatest. When this method is used, apartial vacuum is created within the building or room, and all currentsand leaks are inward; there is nothing to govern definitely the qualityand place of introduction of the air, and it is difficult to provide suit-able means for warming it. Plenum Method. In this case the air is forced into the building,and its quality, temperature, and point of admission are completelyunder
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