Draw a horizontal line from the space point r. This line meets the ordinate, humidity ratio w, at a value of wr 0.00927 lb / lb (kg / kg). This is the humidity ratio of the indoor space air. Draw a line parallel to the enthalpy line from the space point r. This line meets the enthalpy scale line at a value of hr 28.1 Btu / lb. This is the enthalpy of the indoor space air. Draw a horizontal line from the space point r to the left. This line meets the saturation curve at a dew-point temperature of 55°F (12.8°C). Draw a line parallel to the thermodynamic wet-bulb temperature lines through the space point r. The perpendicular scale to this line shows a thermodynamic wet-bulb temperature Tr* 62.5°F (16.9°C). Draw a line parallel to the moist volume lines through the space point r. The perpendicular scale to this line shows a moist volume vr 13.68 ft3/lb (0.853 m3 / kg).
2. The calculations of the humidity ratio, enthalpy, and moist volume are as follows: