A temperature control system (300) for a variable frequency drive (10, 100) includes a sealed enclosure (310), a power electronic component (330) and/or a power magnetic component (320) positioned inside the sealed enclosure (310), and a controller (400) configured to control a temperature of the power electronic component (330) and/or the power magnetic component (320) relative to an internal air temperature (Tair) inside the sealed enclosure (310) prior to an electrical energy application and operation of the power electronic component (320) and/or power magnetic component (320) to prevent condensation induced electrical failure of the power electronic component (330) and/or power magnetic component (320) utilizing a cooling system (340) and/or a heating system (350).

An arrangement for monitoring an aseptic manufacturing process includes product condition sensors capable of making closely spaced measurements of a product condition such as temperature or humidity. The measurements are made using closely spaced sensors arranged in a linear array on a single probe, which may be used to take measurements at multiple levels within the product. Data from the sensors is transmitted to a data collection point via short range wireless digital communications. The sensors may be used to measure temperature and humidity at a single point. For example, when the sensors are used in pharmaceutical freeze drying, the location of a sublimation front may be calculated for each vial, and the freeze drying process may be controlled using the data.

An arrangement for monitoring an aseptic manufacturing process includes product condition sensors capable of making closely spaced measurements of a product condition such as temperature or humidity. The measurements are made using closely spaced sensors arranged in a linear array on a single probe, which may be used to take measurements at multiple levels within the product. Data from the sensors is transmitted to a data collection point via short range wireless digital communications. The sensors may be used to measure temperature and humidity at a single point. For example, when the sensors are used in pharmaceutical freeze drying, the location of a sublimation front may be calculated for each vial, and the freeze drying process may be controlled using the data.

An apparatus and method to deter mold growth on the interior surfaces of buildings. The apparatus is a corded and plugged power supply with adjustable temperature and humidity sensors, logic circuitry, and split duplex receptacles. The method employs the apparatus, a portable heater, an array of portable fans, and catchments containing a hygroscopic substance such as calcium chloride. One receptacle controls the heater. The other receptacle controls the fans. There are three operative states: a heat-on/fans-on state at low temperature, a heat-off/fans-on state at high temperature and high humidity, and an idle state at high temperature and low humidity. The catchments capture water vapor circulated by the fans.

A control system for controlling humidity in an indoor growing environment is provided, which includes software to control the removal of moisture by using current Vapor Pressure Deficit (VPD) as measured in the indoor air space of a grow room in comparison to a target Vapor Pressure Deficit. The temperature and relative humidity in various areas of the grow room are monitored and used by the software to calculate the current VPD and determine a preferred profile for the target VPD. The control system is configured to maintain consistent VPD with moisture removal by a dehumidifier in response to temperature variations throughout a night/day cycle and through successive growth stages to ensure optimal plant growth and transpiration rates.

A control system for controlling humidity in an indoor growing environment is provided, which includes software to control the removal of moisture by using current Vapor Pressure Deficit (VPD) as measured in the indoor air space of a grow room in comparison to a target Vapor Pressure Deficit. The temperature and relative humidity in various areas of the grow room are monitored and used by the software to calculate the current VPD and determine a preferred profile for the target VPD. The control system is configured to maintain consistent VPD with moisture removal by a dehumidifier in response to temperature variations throughout a night/day cycle and through successive growth stages to ensure optimal plant growth and transpiration rates.

In one embodiment, a method for decreasing a humidity level in an information handling system includes: receiving, by a sound field chamber, an incoming airflow, the incoming airflow having a humidity level corresponding to an amount of water vapor in the incoming airflow; identifying, by a humidity controller, the humidity level of the incoming airflow; determining, by the humidity controller, that the humidity level is greater than a threshold humidity level; and in response to determining that the humidity level is greater than the threshold humidity level: causing, by the humidity controller, a sound source of the information handling system to generate a sound field within the sound field chamber, the sound field comprised of sound waves, the sound waves causing an acoustic agglomeration of the water vapor, the acoustic agglomeration causing the humidity level to decrease.

In one embodiment, a method for decreasing a humidity level in an information handling system includes: receiving, by a sound field chamber, an incoming airflow, the incoming airflow having a humidity level corresponding to an amount of water vapor in the incoming airflow; identifying, by a humidity controller, the humidity level of the incoming airflow; determining, by the humidity controller, that the humidity level is greater than a threshold humidity level; and in response to determining that the humidity level is greater than the threshold humidity level: causing, by the humidity controller, a sound source of the information handling system to generate a sound field within the sound field chamber, the sound field comprised of sound waves, the sound waves causing an acoustic agglomeration of the water vapor, the acoustic agglomeration causing the humidity level to decrease.

Techniques for controlling moisture content of build material in a three dimensional printer are provided. An example system includes a build material vessel to contain the build material and receive a flow of air, and a humidifier to adjust the humidity of the air flowing into the build material vessel. The system also includes one or more sensors to determine a dew point of the air flowing into the build material vessel. The humidity level of the air flowing into the hopper is controlled by the humidifier to maintain the dew point at a level that will prevent condensation of water inside the build material vessel.

Various examples are provided of low power, rapid response on-device heaters and methods of calibrating the device within a linear operating region, which is reached and maintained through control of the on-device heater. A system to be calibrated includes a sensor to measure the temperature and relative humidity of the system, a heater coupled to the sensor, a heater controller coupled to the heater to control the heater to heat the system, and a processor coupled to the sensor and the heater controller. The processor controls the heater based on temperature measured by the sensor to perform a calibration process for the system including calculating a calibration factor, and to determine whether to abort the calibration process based on relative humidity measured by the sensor indicating that the system is outside the linear operating region.