According to an aspect of the present disclosure, an air quality management system may include a mobile application distributed to at least one user device, at least one air quality management device, and at least one computing resource, wherein the at least one computing resource operates a first networking layer configured to receive input from the at least one mobile application. Also, the at least one computing resource operates a second networking layer that receives input from the at least one air quality management device. The air quality management system may further comprise a data connection between the first and second networking layers to transfer commands of the at least one mobile application from the first networking layer to the second networking layer, and to transfer device information of the at least one air quality management device from the second networking layer to the first networking layer.

According to an aspect of the present disclosure, an air quality management system may include a mobile application distributed to at least one user device, at least one air quality management device, and at least one computing resource, wherein the at least one computing resource operates a first networking layer configured to receive input from the at least one mobile application. Also, the at least one computing resource operates a second networking layer that receives input from the at least one air quality management device. The air quality management system may further comprise a data connection between the first and second networking layers to transfer commands of the at least one mobile application from the first networking layer to the second networking layer, and to transfer device information of the at least one air quality management device from the second networking layer to the first networking layer.

Embodiments of the present disclosure provide a protection circuit and an air conditioner, which are applied to the field of air conditioner technologies and used to protect an indoor unit. The protection circuit provided by the embodiments of the present disclosure includes: a positive temperature coefficient thermistor; a signal input terminal; and a communication module; wherein a first end of the positive temperature coefficient thermistor is connected to the signal input terminal, and a second end of the positive temperature coefficient thermistor is connected to the communication module.

Embodiments of the present disclosure provide a protection circuit and an air conditioner, which are applied to the field of air conditioner technologies and used to protect an indoor unit. The protection circuit provided by the embodiments of the present disclosure includes: a positive temperature coefficient thermistor; a signal input terminal; and a communication module; wherein a first end of the positive temperature coefficient thermistor is connected to the signal input terminal, and a second end of the positive temperature coefficient thermistor is connected to the communication module.

An air conditioner of the present embodiment includes a heat exchanger unit in which an installation position of a suction temperature sensor can be changed and the air conditioner is capable of determining whether the installation position of the suction temperature sensor is correct. During a cooling operation, a heat exchange temperature is lower than a suction temperature, and during a heating operation, the heat exchange temperature is higher than the suction temperature. However, if a suction temperature sensor is incorrectly disposed on a downstream side of a flow of air in an indoor heat exchanger, the suction temperature detected by the suction temperature sensor is a temperature of indoor air after exchanging heat with a refrigerant in the indoor heat exchanger, so that the heat exchange temperature and the suction temperature are close to each other regardless of the cooling operation or the heating operation.

An air conditioner of the present embodiment includes a heat exchanger unit in which an installation position of a suction temperature sensor can be changed and the air conditioner is capable of determining whether the installation position of the suction temperature sensor is correct. During a cooling operation, a heat exchange temperature is lower than a suction temperature, and during a heating operation, the heat exchange temperature is higher than the suction temperature. However, if a suction temperature sensor is incorrectly disposed on a downstream side of a flow of air in an indoor heat exchanger, the suction temperature detected by the suction temperature sensor is a temperature of indoor air after exchanging heat with a refrigerant in the indoor heat exchanger, so that the heat exchange temperature and the suction temperature are close to each other regardless of the cooling operation or the heating operation.

Embodiments of the disclosure provide a thermal model based on an adaptive filter bank for characterizing heat transfer of a volume of a thermal system. In one embodiment, the adaptive filter bank is used for diagnostics that provides information related to the condition of a thermal system. The diagnostics are based on an analysis of heat transfer characteristics of a dynamic representation of the thermal system. In accordance with the embodiments, thermal coefficients are generated based on an adaptive filter bank. One or more filters are applied to the thermal coefficients based on a sampling rate and one or more estimate thermal coefficient thresholds are generated based on the sampling rate. It is determined whether at least one of the thermal coefficients that is filtered satisfies at least one of the estimated thermal coefficient thresholds. Thereupon, alert information indicative of a diagnostic event is provided based on the determination.

Embodiments of the disclosure provide a thermal model based on an adaptive filter bank for characterizing heat transfer of a volume of a thermal system. In one embodiment, the adaptive filter bank is used for diagnostics that provides information related to the condition of a thermal system. The diagnostics are based on an analysis of heat transfer characteristics of a dynamic representation of the thermal system. In accordance with the embodiments, thermal coefficients are generated based on an adaptive filter bank. One or more filters are applied to the thermal coefficients based on a sampling rate and one or more estimate thermal coefficient thresholds are generated based on the sampling rate. It is determined whether at least one of the thermal coefficients that is filtered satisfies at least one of the estimated thermal coefficient thresholds. Thereupon, alert information indicative of a diagnostic event is provided based on the determination.

An air conditioning apparatus including an outdoor unit and an indoor unit comprises a converter main circuit that rectifies and smooths an AC power supply, and allows a DC voltage to be generated across a main circuit capacitor, an inverter main circuit that converts the DC voltage generated by the main circuit capacitor into an AC voltage, a compressor motor driven by the inverter main circuit, an outdoor fan, a fan motor that rotationally drives the outdoor fan, and a microcomputer that controls the outdoor unit. When the fan motor rotates due to outside wind hitting the outdoor fan and enters a power generating state during a standby power saving mode of the outdoor unit, the microcomputer prevents the outdoor unit from shifting to a non-operating state from the standby power saving mode.

Provided is an air conditioning apparatus. The air conditioning apparatus includes an outdoor unit which includes a compressor and an outdoor heat exchanger and through which a refrigerant is circulated, an indoor unit through which water is circulated, a heat exchanger in which the refrigerant and the water are heat-exchanged with each other, a water tube configured to guide the water circulated through the indoor unit and the heat exchanger, a pump installed in the water tube, and a controller configured to analyze an output signal of the pump so as to calculate a ration of an air layer in the water tube, the controller being configured to control a target supercooling degree or target superheating degree of the heat exchanger according to the calculated ratio of the air layer.