An air conditioner according to an embodiment includes: a compressor configured to compress a refrigerant; an indoor heat exchanger configured to convert a vapor refrigerant into a liquid refrigerant in a heating mode; an outdoor heat exchanger configured to convert a liquid refrigerant into a vapor refrigerant in the heating mode; a main pipe connecting the indoor heat exchanger to the outdoor heat exchanger; an injection pipe branching from the main pipe and connecting to an injection port of the compressor; an injection valve installed on the injection pipe and configured to control a flux of the refrigerant flowing to the injection pipe; and a controller configured to calculate a target discharge superheat (DSH) based on a correlation between a compression coefficient, a compressor frequency, and a DSH that are represented by an operating condition , and control a current DSH based on the target DSH.

A water production system is provided that uses ambient air, a desiccant, a refrigeration cycle, and heat generated by the refrigeration cycle to generate water that may be used when water is scarce, for example during a natural disaster recovery operation. The system may use commercial electrical power in one embodiment, but when commercial electrical power is unavailable, it may rely on generator power. When it relies on generator power, the system may use excess heat exhausted by the generator to heat ambient air prior to its introduction to the desiccant.

A water production system is provided that uses ambient air, a desiccant, a refrigeration cycle, and heat generated by the refrigeration cycle to generate water that may be used when water is scarce, for example during a natural disaster recovery operation. The system may use commercial electrical power in one embodiment, but when commercial electrical power is unavailable, it may rely on generator power. When it relies on generator power, the system may use excess heat exhausted by the generator to heat ambient air prior to its introduction to the desiccant.

A refrigerator includes a main body that has a storage chamber and a drying chamber; a thermoelectric module that includes a heat absorber and a heat dissipater; a cooling fan that circulates air in the storage chamber to the heat absorber and the storage chamber; a heat-dissipating fan that blows air to the heat dissipater; an air guide that has a passage for guiding air heated by the heat dissipater to the drying chamber; a heater that is disposed in the passage; and a damper that controls a flow of air in the passage between the heat-dissipating fan and the heater. Heat of the heat dissipater transfers to the drying chamber through the passage of the air guide and the damper, thereby being able to dry an object to be dried.

An HVAC system with a reheat coil is described, the system includes a compressor, a micro-channel condenser and an evaporator. A reversing valve is connected to the compressor, the micro-channel condenser and the reheat coil. The reversing valve is used to direct the refrigerant from the compressor to the micro-channel condenser in a normal mode, and to direct the refrigerant from the compressor to the reheat coil in a reheat mode. The reversing valve can be switched from normal mode to reheat mode when a high pressure condition is detected at an input to the micro-channel condenser, and switched back from reheat mode to normal mode when the high pressure condition has resolved or an amount of time has passed. In the normal mode the refrigerant is returned from the reheat coil into a refrigerant line between the evaporator and the compressor through a restrictor.

An HVAC system is disclosed, comprising: (a) a compressor, (b) a source heat exchanger for exchanging heat with a source fluid, (c) a first load heat exchanger operable for heating/cooling air in a space, (d) a second load heat exchanger for heating water, (e) first and second reversing valves, (f) first and second 3-way valves, (f) a bi-directional electronic expansion valve, (g) a first bi-directional valve, and (h) a second bi-directional valve to modulate exchange of heat in the first load heat exchanger when operating as an evaporator and to control flashing of the refrigerant entering the source heat exchanger when operating as an evaporator, (h) a source pump for circulating the source fluid through the first load heat exchanger, (i) a water pump for circulating water through the second load heat exchanger, and (j) a controller to control operation of the foregoing.

An icemaker appliance includes a cabinet. A refrigeration system includes a compressor, a condenser, an expansion device, and an evaporator. The refrigeration system is charged with a refrigerant. The refrigeration system further includes a modulator having a reservoir and a supply conduit. The reservoir of the modulator is positioned on an outlet conduit of the evaporator. A first end portion of the supply conduit is coupled to an inlet conduit of the evaporator, and a second end portion of the supply conduit is coupled to the reservoir of the modulator. The refrigerant is flowable into and out of the reservoir of the modulator through the supply conduit of the modulator. An ice maker is positioned within the cabinet. The evaporator of the refrigeration system is coupled to the icemaker such that the refrigeration system is operable to chill the icemaker.

A heat pump system includes a heat pump cycle, a heat medium circulation circuit, and a refrigeration cycle device. The refrigeration cycle device is configured to perform a defrosting operation when a frost formation determiner determines that frost is formed. A throttle opening degree controller is configured to increase an opening degree in the defrosting operation. A pumping capacity controller is configured to increase a pumping capacity in the defrosting operation with increase of a required heating capacity required for heating a heating target fluid, the pumping capacity controller increasing the pumping capacity such that heat of refrigerant discharged from a compressor is transferred to heat medium in a first heat exchanger within a range in which a temperature of the refrigerant flowing into an outside heat exchanger is capable of melting the frost formed on the outside heat exchanger.

A heat pump system includes a heat pump cycle, a heat medium circulation circuit, and a refrigeration cycle device. The refrigeration cycle device is configured to perform a defrosting operation when a frost formation determiner determines that frost is formed. A throttle opening degree controller is configured to increase an opening degree in the defrosting operation. A pumping capacity controller is configured to increase a pumping capacity in the defrosting operation with increase of a required heating capacity required for heating a heating target fluid, the pumping capacity controller increasing the pumping capacity such that heat of refrigerant discharged from a compressor is transferred to heat medium in a first heat exchanger within a range in which a temperature of the refrigerant flowing into an outside heat exchanger is capable of melting the frost formed on the outside heat exchanger.

The present invention provides an inexpensive and stable refrigerant charging device and a refrigerant charging system by improving a charging speed and reducing costs while preventing liquid-back. The present invention includes a refrigerant charging flow path having a refrigerant charging port connected to a refrigerant flow path of an air conditioner, a valve provided at the refrigerant charging flow path, and a control device configured to control the valve. The control device includes a discharging superheat calculator configured to calculate the discharging superheat degree from a refrigerant temperature and a refrigerant pressure at a discharge side of a compressor, and a valve controller configured to control the opening and closing state of the valve based on the calculated discharging superheat degree calculated by the discharge super-heat calculator.