81 results about "Humidity ratio" patented technology

A conditioned vestibule, control system, and method are disclosed for use with a cold storage doorway that separates warm and cold sides. A heater warms an air stream discharged across the doorway by the vestibule. A control unit operates the heater to maintain an air stream temperature. The control unit continuously monitors the air stream temperature and operates the heater to maintain the air stream temperature in a non-saturated state based on a humidity ratio. One embodiment calculates first and second temperatures based, respectively, warm and cold side tangent lines to a psychrometric saturation curve and based on the humidity ratio. The tangent lines are based on humidity and temperature sensed on the warm and cold sides. The air stream is warmed to at least the greater of the first and second temperatures. One embodiment controls air flow to adjust the humidity ratio to more efficiently operate the vestibule.

The present invention relates to a method for defining that dried fruit and vegetable products or deep-fried crisps whether reaching to the glass state storage condition. Said method includes: under the condition of different temperature and moisture activity measuring moisture absorption equilibrium humidity ratio of dried fruit and vegetable products or deep-fried crisp so as to obtain isothermal moisture absorption curve; the measuring glass state conversion temperature of dried fruit and vegetable products or deep-fried crisps with different water contents, making hoth them implement complementation and application so as to obtain their critical moisture activity which reaches to glass state storage temperature condition. Said invention can ensure storage quality and stability of dried fruit and vegetable products or deep-fried crisps.

The invention discloses a humidity calibration method. The humidity calibration method is characterized by comprising the following steps of acquiring saturated humidity corresponding to different temperatures under a predetermined atmospheric pressure, as well as a measured temperature and an environmental temperature; correcting the measured temperature to obtain a corrected temperature; acquiring saturated humidity corresponding to the measured temperature and the corrected temperature; and correcting the measured humidity according to the saturated humidity at the measured temperature andthe saturated humidity at the corrected temperature. According to the humidity calibration method provided by the invention, the measured humidity is calibrated by using the principle that the saturated humidity ratio at a corresponding temperature is equal to the unsaturated humidity ratio at the corresponding temperature, so that the method is suitable for the situation that the environmental humidity measured by a humidity sensor under the influence of the temperature difference of an object to be measured is inaccurate due to the temperature difference between the objected to be measured and the environmental temperature. The invention further provides a humidity calibration module using the calibration method and a dehumidifier using the humidity calibration module. The dehumidifier can be used for sensing the environmental humidity more accurately for more accurate automatic control.