A method of operating an air conditioner unit, as provided herein, includes initiating a first heat pump cycle, the first heat pump cycle comprising sending a control signal to the fan to rotate at a predetermined rotational speed, and detecting an actual rotational speed of the fan, calculating a first flow rate of air through the first heat exchanger based on the control signal and the actual rotational speed, storing the first flow rate as a first reference flow rate, stopping the first heat pump cycle, initiating a second heat pump cycle, calculating a second flow rate of air through the first heat exchanger, comparing the calculated second flow rate to the first reference flow rate, and directing the air conditioner unit based on the comparison of the calculated second flow rate to the first reference flow rate.

Provided is a refrigerant cycle apparatus capable of suppressing detects caused by iodine even when a refrigerant containing iodine is used. An air conditioner includes a refrigerant circuit through which a refrigerant containing iodine circulates. The refrigerant circuit includes a component that is in contact with a refrigerant containing iodine, the component being made of metal other than aluminum or an aluminum alloy, or having a content of aluminum which is equal to or less than a ratio at which corrosion of aluminum occurs by iodine. The component is at least one of a component of a compressor, a component of a heat-source-side heat exchanger or a utilization-side heat exchanger, a component of an expansion valve, a drier, and a connection pipe.

In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system is performed by a controller in the HVAC system. The method includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.

An apparatus evaluation system includes a first evaluation unit that evaluates a first air conditioning apparatus, and a first air conditioning control unit that controls a second air conditioning apparatus. The first evaluation unit performs a first evaluation process to evaluate the first air conditioning apparatus based on a first evaluation index obtained in a first operation performed as a first evaluation operation at a time of installation, and a second evaluation process to evaluate the first air conditioning apparatus based on the first evaluation index obtained in a second operation performed as the first evaluation operation after the first evaluation process. The control unit operates the second air conditioning apparatus before at least one of the first and second operations of the first air conditioning apparatus is performed, and/or while at least one of the first and second operations of the first air conditioning apparatus is being performed.

A refrigeration cycle apparatus includes a refrigeration cycle circuit connecting a compressor, a refrigerant flow switching device, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, a first junction portion provided between the outdoor heat exchanger and the expansion valve and configured to divide refrigerant, a second junction portion provided between the indoor heat exchanger and the refrigerant flow switching device and configured to divide the refrigerant, a bypass pipe connecting the first junction portion and the second junction portion and configured to cause the refrigerant to flow through the bypass pipe, a first valve provided between the second junction portion and the refrigerant flow switching device, a second valve provided to the bypass pipe, a first temperature sensor configured to measure a temperature in a room to which air passing through the indoor heat exchanger is provided, and a second temperature sensor configured to measure a temperature of refrigerant at a liquid portion of the indoor heat exchanger. In an operation status in which the compressor operates, the expansion valve is fully closed, the first valve is opened, and the second valve is closed, when a temperature measured by the first temperature sensor and a temperature measured by the second temperature sensor are different from each other, the refrigeration cycle apparatus is configured to detect an abnormality at at least one of the expansion valve and the second valve.

An integrated air conditioning system includes an outdoor unit, an indoor unit, and a ventilation device. The ventilation device includes a housing including an inlet flow path, and an outlet flow path, a total heat exchanger in which air flowing through the inlet flow path and air flowing through the outlet flow path exchange heat with each other, a first heat exchanger disposed on the inlet flow path to receive a refrigerant from the outdoor unit, a second heat exchanger disposed upstream of the first heat exchanger on the inlet flow path and connected to the first heat exchanger to be supplied with refrigerant discharged from the first heat exchanger, a first expansion device to expand the refrigerant supplied to the first heat exchanger from the outdoor unit, and a second expansion device to expand the refrigerant discharged from the first heat exchanger and supplied to the second heat exchanger.

An integrated air conditioning system includes a ventilation device comprising a first temperature sensor, a first humidity sensor, and a heat exchanger installed on the inlet flow path. An indoor unit configured to discharge heat-exchanged air into an indoor space. An outdoor unit configured to supply a refrigerant to the ventilation device and the indoor unit. A controller connected to the ventilation device, the indoor unit, and the outdoor unit. The controller configured to obtain an indoor temperature from the first temperature or the second temperature sensor. The controller configured to obtain indoor humidity from the first humidity sensor or the second humidity sensor and configured to control at least one of the ventilation device and the indoor unit based on the indoor temperature and the indoor humidity.

A performance degradation diagnosis system includes a determining unit, and control unit. A refrigeration cycle apparatus includes a refrigerant circuit having a compressor, heat-source-side heat exchanger, and use-side heat exchanger. The determining unit determines, based on an index indicating an operation state of the refrigeration cycle apparatus, performance degradation of the refrigeration cycle apparatus with respect to each of a plurality of performance degradation factors. In a case in which the determining unit determines performance degradation, the control unit grasps an operation condition of the refrigeration cycle apparatus which is operating. In a case in which the operation condition of the refrigeration cycle apparatus is not suitable to determine performance degradation with respect to a performance degradation factor of a determination target, the control unit controls the operation condition of the refrigeration cycle apparatus so that the operation condition of the refrigeration cycle apparatus becomes an appropriate operation condition.

A vapor compression system that includes a controller. The controller includes instructions for switching between first and second modes of operation of the vapor compression system. The controller activates a first compressor and a second compressor of the vapor compression system in the first mode of operation in response to a temperature level and a humidity level exceeding a threshold temperature and a threshold humidity level, respectively. And in the second mode of operation, the controller activates the first compressor in response to only the humidity level exceeding the threshold humidity level.

A method for controlling a refrigerator comprises: as a first refrigeration cycle for refrigeration of a first storage chamber is operated, operating a compressor and operating a first cold air supply; when the first refrigeration cycle has been operated for a first run time, converting to a second refrigeration cycle for refrigeration of a second storage chamber, and operating a second cold air supply; and if the second refrigeration cycle has been operated for a second run time, stopping the second refrigeration cycle. A first reference time is determined using a representative value obtained based on the temperature of the first storage chamber during a single run cycle, which includes a previous first refrigeration cycle and a previous second refrigeration cycle. A second reference time period is determined using a representative value obtained on the basis of the temperature of the second storage chamber during the single run cycle.