Qualitative analysis of the LiCl-hygrometer
Abstract
A mathematical model is proposed which describes the LiCl-hygrometer system using second-order derivative equations whose coefficients are functions of the heater voltage, ventilation wind speed, and ambient-air temperature. The dynamic response to the step change of one parameter is shown to be equivalent to that of an ordinary second-order system when both step and delta functions are applied. For the case of fixed operating conditions, the increase of the vapor pressure of the ambient air is found to raise the equilibrium liquid water content such that the vapor pressure-temperature curve of the hygrometer has a steeper inclination than that of the saturated bulk LiCl solution.
- Publication:
-
Papers Meteorology Geophysics
- Pub Date:
- December 1987
- Bibcode:
- 1987PMG....38..279S
- Keywords:
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- Hygrometers;
- Lithium Chlorides;
- Vapor Pressure;
- Ambient Temperature;
- Dew Point;
- Electrical Resistivity;
- Wicks