From Eq. (2.49), the humidity ratio of the saturated air at the dry-bulb temperature is
ws 0.00080264 0.000024525T 2.542e-06T 2 2.5855e-08T 3 4.038e-10T 4
0.00080264 0.0018394 0.014299 0.010908 0.012776
0.018809 lb / lb
According to Eq. (2.16), the saturated water vapor pressure of the indoor air is