Abstract:
A heating, ventilating and air conditioning (HVAC) system, comprising a heat exchanger plenum having a surface located therein that is susceptible to degradation upon exposure to light, and a light bulb located within the plenum. In one embodiment, the light bulb has a side directed toward the surface and a light-absorptive barrier coupled to the side. The light-absorptive barrier is configured to reduce direct light transmission from the light bulb to the surface to thereby inhibit degradation of the surface. The invention further provides an HVAC system comprising a light bulb configured to emit photonic energy, and an absorptive barrier coupled to at least a portion of an outside of the bulb. The absorptive barrier is configured to substantially reduce transmission of the emitted photonic energy beyond the portion of the bulb.
Abstract:
A space conditioning system for conditioning air within an enclosed space. The system comprises a refrigeration subsystem configured to circulate a flammable refrigerant there-through. The refrigeration subsystem also comprises a safety module configured to include either: a leak-detector subunit, or, a start-up subunit. The leak-detector subunit is configured to monitor for a leak of the flammable refrigerant from the refrigeration subsystem, and, to generate an alarm signal if the leak is detected. The start-up subunit is configured to turn on one or more airflow devices configured to vent or mix a leaked flammable refrigerant.
Abstract:
A control system for a permanent magnet synchronous motor includes a position estimator means having for cross correlating the back EMF of the unenergized winding with a reference waveform to determine the estimated position of the rotor for determining rotor angle position error; an error compensator, responsive to the rotor angle position error, for determining the angular speed of the field; an angle generator, responsive to the angular speed of the field, for generating the field angle position; and a waveform generator, responsive to the rotor angle position, for generating a periodic signal corresponding to each winding and designating a segment of that signal for driving that winding to adjust the field speed to the rotor speed.
Abstract:
A heating, ventilating and air conditioning (HVAC) system, comprising a heat exchanger plenum having a surface located therein that is susceptible to degradation upon exposure to light, and a light bulb located within the plenum. In one embodiment, the light bulb has a side directed toward the surface and a light-absorptive barrier coupled to the side. The light-absorptive barrier is configured to reduce direct light transmission from the light bulb to the surface to thereby inhibit degradation of the surface. The invention further provides an HVAC system comprising a light bulb configured to emit photonic energy, and an absorptive barrier coupled to at least a portion of an outside of the bulb. The absorptive barrier is configured to substantially reduce transmission of the emitted photonic energy beyond the portion of the bulb.
Abstract:
A heating, ventilating and air conditioning (HVAC) unit. The unit comprises a heat exchanger or drain pan located inside a HVAC housing that has one or more access openings and ultraviolet light-sensitive components therein. The unit also comprises a light located inside of the HVAC housing and a light shield located between the heat exchanger or drain pan and the light source. The light source includes a network of open-ended cells, each cell having ultraviolet light reflective walls. The light shield is oriented to direct an ultraviolet light from the light source through the open-ended cells towards the heat exchanger or drain pan and away from the one or more access openings and ultraviolet light-sensitive components.
Abstract:
A hysteresis circuit including first and second voltage reference circuits responsive to an input control signal for providing first and second voltage levels connected in series to produce a higher voltage level; a first switching circuit, responsive to the voltage reference circuits to turn on and provide an output drive signal when the higher voltage is reached; a second switching circuit, responsive to the first switching circuit turning on, for removing one of the first and second voltage levels to produce a lower voltage level; the first switching circuit turning off in response to the input level control signal decreasing below the lower voltage level.
Abstract:
An air blower validator, a heating, ventilating and air conditioning (HVAC) system and a method of manufacturing thereof are disclosed. In one embodiment, the air blower validator includes: (1) a air pressure detector including a first pressure port configured to receive air from inside an air blower housing of an HVAC system and (2) an air collector configured to deliver the air to the first pressure port, the air collector including a pressure tap configured to couple to an opening in the air blower housing.
Abstract:
A heating, ventilating and air conditioning (HVAC) unit. The unit comprises a heat exchanger or drain pan located inside a HVAC housing that has one or more access openings and ultraviolet light-sensitive components therein. The unit also comprises a light located inside of the HVAC housing and a light shield located between the heat exchanger or drain pan and the light source. The light source includes a network of open-ended cells, each cell having ultraviolet light reflective walls. The light shield is oriented to direct an ultraviolet light from the light source through the open-ended cells towards the heat exchanger or drain pan and away from the one or more access openings and ultraviolet light-sensitive components.