GRAPH 1 SYSTEM PERFORMANCE AS FOUND GRAPH 2 SYSTEM PERFORMANCE AFTER LOGIC CORRECTION AVERAGE MIXING DAMPERS’ SIGNAL 11.40# (RANGE 3#-13#) AVERAGE RETURN AIR TEMPERATURE 75.4°F (24.1°C) AVERAGE OUTSIDE AIR TEMPERATURE 45.9°F (7.7°C) AVERAGE HEATING VALVE SIGNAL 9.1# (RANGE 5#-12#) AVERAGE DISCHARGE TEMPERATURE 81.6°F (27.6°C) AVERAGE MIXED AIR TEMPERATURE 53.14°F (11.7°C) AVERAGE 74.86% FRESH AIR. (MINIMUM REQUIREMENT = 27.4%.) 10:00 11:00 12:00 1:00 2:00 3:00 4:00 5:00 6:00 PM PM AM AM AM AM AM AM AM 7:00 8:00 9:00 10:00 11:00 12:00 1:00 2:00 3:00 4:00 PM PM PM PM PM AM AM AM AM AM AVERAGE RETURN AIR TEMPERATURE 74.7°F (23.7°C) AVERAGE VALVE SIGNAL 11.76# (RANGE 5#-12#) AVERAGE OUTSIDE AIR TEMPERATURE 45.9°F (7.7°C) AVERAGE MIXED AIR TEMPERATURE 67.3°F (19.6°C) AVERAGE DISCHARGE AIR TEMPERATURE 70.66°F (21.5°C) AVERAGE MIXING DAMPERS’ SIGNAL 2.1# (RANGE 3#-13#) 6.3 BASED ON THE ACTUATORS’ RANGE THE DAMPERS WERE COMPLETELY CLOSED; HOWEVER, DAMPER LEAKAGE ALLOWED THE 27.4% MINIMUM FRESH AIR. NOTE: THE DISCHARGE AIR REQUIRED A 28.46F° TEMPERATURE RISE, ATTAINING THE 81.6°F. IF THE LOGIC CREATING GRAPH 2 GOVERNED, THE REQUIRED TEMPERATURE RISE WOULD HAVE BEEN 14.3F°, SAVING 49.75% BTU’S. 8.78
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