A solid-state sensor, including an enclosure having a first opening in a first side of the enclosure and a second opening in a second side of the enclosure, a first passageway in fluid communication with the first and second openings, and a solid-state direction sensor positioned within the first passageway. The solid-state direction sensor can include a first sensor positioned at a first axial position, a second sensor positioned at a second axial position, and a flow deflector positioned at a third axial position that is between the first and second axial positions. The flow deflector can extend into the first passageway so as to constrict the first passageway.

A zoning system for a heating, ventilation, and/or air conditioning (HVAC) system includes a temperature control device configured to monitor a temperature in a zone of a structure for conditioning by the HVAC system and configured to send a wireless control signal including data based on the temperature, and a damper actuator configured to be associated with the zone and configured to adjust a position of a damper to control an airflow into the zone, where the damper actuator is configured to receive the wireless control signal from the temperature control device and configured to adjust the position of the damper based on the data.

A device is configured to operate a Heating, Ventilation, and Air Conditioning (HVAC) system. The device is further configured to receive a temperature value and determine a load demand value based on the temperature value. The device is further configured to determine the load demand value is greater than the load capacity value for the HVAC system and, in response, identify a first setting from among a first plurality of settings for the HVAC system. By default, access to the first plurality of setting for the HVAC system is restricted for a user. The device is further configured to receive a response approving permission to operate the HVAC system using the first setting to the user and send a trigger signal to an HVAC controller to operate the one or more components of the HVAC system using the first setting.

Systems, apparatus and methods for independently reducing temperature and humidity of air in a controlled space to meet separate temperature and humidity control set points. A preferred system can include a compressor, a condenser connected to the compressor to provide a liquid refrigerant flow, a controllable segmented heat-exchanger coil for controlling relative flow of coolant to active segments for cooling airflow so that adjustable humidity and temperature control is provided for the controlled space, the active coil segments being stacked and parallel, a liquid-suction heat-exchanger separator to provide increased dehumidification and efficiency, increased refrigerant vapor density, and reduced condenser pressure, and a liquid level sensor attached to the liquid-suction heat-exchanger separator to realize evaporator coil freezing temperature for dehumidification, along with preventing liquid refrigerant entering the compressor, while providing unevaporated liquid refrigerant flow from the outlet of the heat-exchanger coil.

Methods and apparatus to monitor environmental conditions and reduce condensation are disclosed. An example apparatus includes a first sensor system to measure a first temperature in a first area and a second sensor system to measure a second temperature in a second area adjacent to the first area. The first area being separated from the second area by a door. A controller has at least one memory, instructions, and processor circuitry to execute the instructions to at least: compare the first temperature and the second temperature; determine if a temperature difference between the first temperature and the second temperature exceeds a temperature threshold; and in response to determining that the temperature difference does not exceed the temperature threshold, deactivate a fan located in the first area.

An HVAC renewable energy management system and components to enable the efficient use of locally produced power from an onsite nanogrid and interconnected nanogrids of a cohesive direct current microgrid network. The system comprises a central controller for controlling one or more intermittent distributed energy resource (DER), source converter, distributed storage device, energy storage converter, power bus, internal load, and interface gateway to one or more external grid for bi-directional power control, sharing, and consumption. System hardware and software elements are configured for internetworking communication, management, control, demand side management, and power balance, using maximum power point tracking to shift power consumption, dynamic matching of local DER production, power quality assurance, system protection, power interconnection management, interface management, metering, revenue settlement, system optimization, and security. The system can match local power production with an individual household's power consumption to reduce intermittency and ultimately total microgrid consumption.

A heating, ventilation, and air-conditioning (HVAC) system. The HVAC system may include a refrigeration circuit and a blower system. The refrigeration circuit may include a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger. The blower system may include a first direct-drive blower and a second direct-drive blower. The first direct-drive blower may flow air over the indoor heat exchanger. The second direct-drive blower may flow air over the indoor heat exchanger and the second direct-drive blower may operable and positionable relative to the indoor heat exchanger independently from the first direct-drive blower.

An adiabatic cooling system including a controller is operable to determine a time period between a first cycle in a recovery mode and a second cycle in the recovery mode. If the time period is less than a first preset time period, then there is a first time lapse before the controller enters the fluid supply mode, and if the time period is greater than a second preset time period, then there is a second time lapse before the controller enters the fluid supply mode, and the first time lapse is greater than the second time lapse.

An insulated heating-unit cover having an opening to permit air to circulate around the heating-source when a vent disposed at the top of the cover is opened, allowing heat into a space. The cover can include a heating-unit temperature sensor disposed within a space covered by the cover and a controller in wireless communication with a space temperature sensor located at a distance away from the heating-unit. The controller can be configured to operate an actuator such that the vent is open when the space temperature sensor indicates that the ambient temperature is below a set point temperature and such that the vent is closed when the ambient temperature is greater than the set point temperature. The controller can communicate with a plurality of other similar controllers and a central server to effect changes in the output of a central heating source coupled to a plurality of individual heating-units.

An indoor air cleaning system with disconnection detecting and preventing mechanism includes a gas filtration device and a cloud computing server. The gas filtration device is disposed in an indoor field and including a fan, a filter element, a gas detector and a driving control element. The gas detector detects air pollution, outputs air pollution information. The cloud computing server receives the air pollution information via IOT communication, stores the air pollution information to form a big data database, performs an intelligence computing for comparison based on the big data database, and issues a control command to enable the fan. When IOT communication is judged as disconnected, the gas detector autonomously computes and compares the air pollution information and issues the control command to enable the fan, thereby reaching a gas state of the indoor field to a cleanroom class with a level of air pollution close to zero.