Humidity control system
AssigneeHoneywell Inc.
InventorPaul C. Wacker
Life of this patent
Estimating the term…
Abstract
A humidity control system for a space receiving conditioned air from a duct has sensors which measure the current humidity in both the space and the duct. The system calculates a duct set point based on the difference between the current space humidity and the humidity set point for the space. The system then controls the humidity of the air passing through the duct so as to both minimize the difference between the space humidity and the humidity set point for the space and to prevent the air in the duct from reaching its dew point. A special algorithm is used to compensate for lag in the duct's humidity sensor.
Claims10
Apparatus for controlling humidity in a space including a humidity sensor providing a space humidity signal encoding a value representing the space humidity and receiving air from a duct, said duct including humidity control apparatus for variably changing the humidity of the air passing through the duct to a level which is a function of the value encoded in a humidity demand signal, comprising
- a) a duct humidity sensor having i) a sensing element mounted in the duct and providing a sensor signal encoding a sensor value following the current duct humidity, and ii) duct humidity signal means receiving the sensor signal, for providing a duct humidity signal encoding a duct humidity value dependent on the sensor value and approximating the current value of the duct humidity;
- b) a first calculator means recording a space humidity set point value and receiving the space humidity signal, for providing a space humidity error signal encoding a space humidity error value equal to the difference between the space humidity value and the space humidity set point value;
- c) a memory means for issuing a duct humidity limit signal encoding a preselected maximum duct humidity value;
- d) a second calculator means receiving the space humidity error signal and the duct humidity limit signal, for calculating a duct humidity set point value as a function of the space humidity error value, and less than the duct humidity maximum value, and for issuing a duct humidity set point signal encoding the duct humidity set point value;
- and
- e) modulator means receiving the duct humidity set point signal and the duct humidity signal, for providing a humidity demand signal having a value responsive to the difference between the duct humidity set point value and the duct humidity value encoded in the duct humidity signal.
Dependencies are inferred from the claim text.