An HVAC system includes a first air quality sensor and a second air quality sensor. The system contains a controller which calculates a differential between the first air quality sensor and the second air quality sensor. The differential is compared to a threshold. If the threshold is satisfied, a fan is engaged which may, reducing the air quality differential as sensed by the first and second air quality sensor.

A ventilation system including a ventilator and a processor. The ventilator includes a housing, first intake, second intake, first outlet, second outlet, dampers, first air blower, second air blower, total heat exchanger, and heat exchanger. The processor is configured to change the air flow path of air flowing through the housing from an intake flow path and discharge flow path while in a ventilation mode to a heat exchanger cleaning mode or a total heat exchanger drying mode, in which air in the room flows into the housing through the first outlet, passes through the heat exchanger and then the total heat exchanger, and is discharged to the space outside the room through the second outlet.

A method for controlling a climate test chamber for conditioning air and a test chamber includes a fuel cell assembly exposed to at least one physical test condition in a test space. The fuel cell assembly includes at least one electrochemical fuel cell having an anode compartment and a cathode compartment each having a feed opening for introducing reactants and a discharge opening for discharging waste products of the fuel cell assembly. The fuel cell assembly is operated in the test space, and a fuel gas and an oxidation gas is fed to the fuel cell assembly as reactants. The test space is supplied with conditioned supply air and exhaust air is discharged from the test space by an air conditioning and ventilation system. An oxygen concentration is determined using a sensor and a controller controls the oxygen concentration.

The disclosure is directed to techniques for a thermostat to determine the air temperature of a room based on measurements of temperatures sensors located inside a housing of the thermostat. Because the thermostat for an evaporative cooler operates at line voltage and controls current flowing to the evaporative cooler, the magnitude of current flowing through the thermostat may vary from nearly zero, when the thermostat is in the powered-off state, to a current on the order of several amps. The variation in current causes a variation in temperature inside the housing of the thermostat. The techniques of this disclosure compensate for changes the internal housing temperature caused by changes in operating mode. The compensation allows the temperature sensors inside the thermostat housing to determine the air temperature of the room in which the thermostat is located, without regard for the operating mode of the evaporative cooler system.

A rooftop air conditioning unit includes a cabinet, an energy recovery wheel rotatably mounted within the cabinet, and a controller. The energy recovery wheel can transfer heat between an outdoor air stream and a return air stream when rotated into an operational position and will not transfer heat when rotated into a bypass position. The controller can select the operational position of the energy recovery wheel and an operational mode of the energy recovery wheel.

An autonomous device for measuring at least one characteristic of a fluid circulating in a conduit in a flow direction comprises a permanent magnetic field source, a magneto-electric converter and a processing circuit capable of using the electric charges supplied by the converter to supply a measurement of a characteristic of its environment. The source and the converter are placed in a stator and a rotor forming the device. The autonomous device further comprises attachment means allowing the stator to be fixedly placed in the conduit or at one end of the conduit, in a configuration in which the axis of rotation of the rotor is parallel to the flow direction. A control system may employ at least one such autonomous device.

A building system for a building including one or more storage devices storing instructions thereon that, when executed by one or more processors, cause the one or more processors to operate one or more pieces of building equipment associated with a building space based on a first operating mode. The instructions cause the one or more processors to receive an indication to update operation of the building space based on an emergency situation and responsive to receiving the indication to update operation of the building space based on the emergency situation, operate the one or more pieces of building equipment based on a second operating mode, wherein the second operating mode defines one or more second parameters for the one or more pieces of building equipment and is adapted to reconfigure the operation of the building space to address or mitigate the emergency situation.

Proposed is a household ventilation apparatus capable of adjusting air velocity in multiple stages and, particularly, a household ventilation apparatus capable of adjusting air velocity in multiple stages, which is installed in a bathroom and the like of a building such as an apartment so as to adjust the ventilation speed and to change the ventilation speed such that noise is reduced or rapid ventilation is performed depending on a user's preference and the like. The household ventilation apparatus includes: a housing; a motor mounted in the housing; a fan member mounted on the motor so as to rotate; an air volume adjusting unit for setting the magnitude of the air volume of the fan member by means of external input; and a control unit for controlling the rotational speed of the motor in accordance with a set value of the air volume of the air volume adjusting unit.

An information processing apparatus according to the present application includes an acquisition unit, a determination unit, and an appliance control unit. The acquisition unit acquires recipe information which is information regarding cooking performed by the user. Based on the recipe information acquired by the acquisition unit, the determination unit determines a non-cooking appliance that is an appliance used by the user and is not used for cooking to be an appliance being a control target. The appliance control unit controls the non-cooking appliance determined by the determination unit at a timing before a predetermined process based on a predetermined condition.

In one embodiment, a ventilation control system includes a processor; a memory; a calculation module to calculate an inverse protection factor for a structure using a lumped element model, the inverse protection factor being an inverse of a protection factor which is a ratio of contaminant which the one or more infected individuals exhale in the structure and contaminant which the uninfected individual inhales in the structure; and a ventilation control module to control a ventilation system to modify air flowing in the structure. The inverse protection factor is calculated based on operating parameters of the ventilation system, arrangement of spaces of the structure, and locations and relative positions of the infected and uninfected individuals in the structure with respect to air flowing in the structure and influenced by the ventilation system. The ventilation control module is configured to control the ventilation system based on the calculated inverse protection factor.