TEMP. °F BTU BTU BTU BTU BTU 80 (10.20#) 28.79 29.10 30.00 29.90 31.23 31.10 32.45 32.30 33.68 33.80 79 ( 9.96#) 28.23 28.40 29.41 29.60 30.59 30.70 31.77 32.30 32.96 33.30 78 ( 9.72#) 27.68 27.40 28.82 28.80 29.96 30.00 31.10 31.10 32.25 32.30 77 ( 9.48#) 27.14 27.30 28.24 28.20 29.34 29.60 30.45 30.60 31.56 32.00 76 ( 9.24#) 26.61 26.60 27.67 27.90 28.74 29.10 29.81 30.40 30.88 30.00 75 ( 9.00#) 26.09 26.00 27.12 27.10 28.15 28.30 29.18 29.50 30.21 30.00 74 ( 8.76#) 25.58 25.50 26.57 27.20 27.56 27.80 28.56 29.20 29.56 30.50 73 ( 8.52#) 25.07 25.70 26.03 26.40 26.99 27.70 27.95 28.70 28.92 30.00 72 ( 8.28#) 24.58 24.60 25.50 25.80 26.43 27.10 27.36 28.10 28.29 29.20 71 ( 8.04#) 24.09 24.20 24.98 25.20 25.87 26.30 26.77 27.30 27.67 28.40 70 ( 7.80#) 23.61 23.70 24.47 24.60 25.87 25.90 26.20 27.10 27.06 28.10 RH% 40% 45% 50% 55% 60% Temperature transmitter is 0°F to 100°F. Humidity transmitter is Robertshaw 0% RH to 100% RH. Branch signal is 21 BTU/lb dry air (3 PSIG) to 39 BTU/lb dry air (15 PSIG). Note: As the dry bulb temperature drops and the relative humidity rises, the BTU values remain within one percent variation. There are more BTU’s in the air at 71° F than at 76° F. ENTHALPY VALUES (PSYCHROMETRIC CHART IN BLACK. (BTU/LB DRY AIR) ( VALUES PRODUCED VIA CONTROL LOOP IN BLUE. BTU/LB DRY AIR) 8-110
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