Figure 3: Pressure loss as a function of airflow. dry air Figure 4: Effectiveness as a function of airflow. dry air 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 flow [ft 3 30 60 90 120 150 180 210 240 270 300 ] m-1 height (inches) 48 12 16 Figure 5: Influence on effectiveness due to condensation heat. return-air: +68°F / height: 15.75” / airflow: 492 ft3 100 99 98 97 96 95 94 93 92 91 90 -4 514233241505968 outside temperature [°F] h-1 return-air RH (%) 100 80 60 40 20 0 68 59 50 41 32 23 14 5 -4 20 100 95 90 85 80 75 70 65 60 55 50 0 flow [ft m-1 30 60 90 120 150 180 210 240 270 300 3 ] height (inches) 48 12 16 Figure 6: Exhaust air temperature as a function of the outside temperature. return-air: +68°F / height: 15.75” / airflow: 492 ft3 h-1 20 freezing risk return-air RH (%) 100 80 60 40 20 0 -45 14 23 32 41 50 59 68 outside temperature [°F] 5 effectiveness [%] Pressure drop [inches Water Column] exhaust air temperature [°F] effectiveness [%] Pagina 4
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