[ W = 0.62198 \cdot \fracP_vP - P_v ]
On the chart, the mix point lies on a straight line between the two state points, proportionally closer to the larger mass flow. In drying, air removes moisture from a product. The drying potential depends on the difference between the saturation humidity ratio at the product surface temperature and the air’s W. Lower W (drier air) increases the driving force. 4.4 Cooling Coil Dehumidification Air passing over a cold coil below dew point reduces W. The condensate removed per kg dry air = ( W_in - W_out ). This directly sizes condensate drains. 5. Humidity Ratio vs. Other Moisture Metrics | Property | Symbol | Temperature dependent? | Direct measure of moisture mass? | Use case | |----------|--------|------------------------|--------------------------------|-----------| | Humidity ratio | W | No (for fixed P) | Yes | Mass balances, drying, latent load | | Relative humidity | φ | Yes | No | Comfort, microbial growth | | Dew point temp. | T_dp | N/A (indirect) | Indirect (unique with W) | Avoiding condensation | | Wet-bulb temp. | T_wb | Yes | No | Evaporative cooling, enthalpy | humidity ratio psychrometric chart
Among these, the (W, often expressed in kg water/kg dry air or grains of moisture/lb dry air) is arguably the most direct measure of actual moisture content. While relative humidity is widely used in weather forecasts and comfort discussions, it fails to indicate the absolute quantity of water vapor. The humidity ratio fills this gap, making it indispensable for engineering calculations involving mass balance, humidification, dehumidification, and drying. [ W = 0