The present disclosure provides a refrigeration device including a circuit having an evaporator, a compressor, a condenser, and an expansion valve orderly connected by a refrigerant flow path. The refrigeration device further includes a first sensor to sense ambient temperature, second sensor to sense evaporator inlet temperature, a microwave module disposed proximal to the evaporator to generate microwaves, and a controller coupled to the first sensor, the second sensor and the microwave module. The controller determines whether a difference in temperature value between the ambient temperature and the evaporator inlet temperature is equal to or greater than a first predetermined temperature value, and initiates operation of the microwave module to heat an inlet of the evaporator when the difference in temperature value between the ambient temperature and the evaporator inlet temperature is equal to or greater than the first predetermined temperature value.

An indoor unit of an air-conditioning apparatus includes a controller that controls a refrigeration cycle, an up/down air flow direction plate, and a left/right air flow direction plate, based on information of a person whose image is captured by an imaging device. When the refrigeration cycle is stopped, in a case where the face of the person detected by the imaging device remains stationarily facing the imaging device for a preset recognition time, the controller recognizes the person as one wishing the refrigeration cycle to be activated, and activates the refrigeration cycle.

An integrated air conditioning system includes an indirect outdoor air cooler having a first heat exchanger for passing through indoor air as warm air, a second heat exchanger for passing through outdoor air, and piping and a pump for circulating a fluid through the first heat exchanger and the second heat exchanger; an air conditioner having an evaporator, a compressor, and a condenser, for passing the indoor air to convert to cold air; a fan for passing the outdoor air through the second heat exchanger and the condenser; and a control device. The control device sets any mode from among a first mode for performing an individual operation of the indirect outdoor air cooler, a second mode for performing an individual operation of the air conditioner, or a third mode for performing a combined operation of the air conditioner and the indirect outdoor air cooler, to a current operation mode.

A refrigeration plant with a cooling circuit, comprising at least one peripheral unit having a refrigeration machine for refrigerating a storage compartment; the refrigeration machine having a heat exchanger connected to the cooling circuit for dissipating heat to a secondary fluid flowing therein; a cooling apparatus connected to the cooling circuit for cooling the secondary fluid; a control device connected to the cooling apparatus and configured to operate the cooling apparatus so as to maintain at least an operating temperature of the secondary fluid within at least a corresponding reference range or to equalize it to at least a corresponding target value.

A heating, ventilation, and/or air conditioning (HVAC) system includes a mobile air conditioning unit configured to separately dock with each docking station of a plurality of docking stations. The mobile air conditioning unit includes a refrigerant circuit configured to condition an airflow to produce a conditioned airflow and a transportation system configured to autonomously relocate the mobile air conditioning unit.

A method for operating an electrocaloric system includes determining an internal temperature lift of an electrocaloric device. A current temperature of a space to be cooled is determined. A heat rejection temperature is determined. A difference between the current temperature and the heat rejection temperature is determined. A target temperature lift is determined based on the difference and a target temperature for the space. A voltage applied to the electrocaloric device is modulated based on the internal temperature lift and the target temperature lift.

A heat source unit and a refrigeration cycle apparatus that are able to reduce damage to a connection pipe when a refrigerant containing at least 1,2-difluoroethylene is used are provided. An outdoor unit (20) that is connected via a liquid-side connection pipe (6) and a gas-side connection pipe (5) to an indoor unit (30) including an indoor heat exchanger (31) and that is a component of an air conditioner (1) includes a compressor (21) and an outdoor heat exchanger (23). A refrigerant containing at least 1,2-difluoroethylene is used as a refrigerant. A design pressure of the outdoor unit (20) is lower than 1.5 times a design pressure of each of the liquid-side connection pipe (6) and the gas-side connection pipe (5).

A method for operating an electrocaloric system includes determining an internal temperature lift of an electrocaloric device. A current temperature of a space to be cooled is determined. A heat rejection temperature is determined. A difference between the current temperature and the heat rejection temperature is determined. A target temperature lift is determined based on the difference and a target temperature for the space. A voltage applied to the electrocaloric device is modulated based on the internal temperature lift and the target temperature lift.

A method of auxiliary heat staging in a heat pump system having a geothermal water source or open loop. The method includes receiving a demand for heating in the heat pump system, receiving a temperature signal indicative of a temperature associated with a liquid in the geothermal loop, determining if the temperature associated with the liquid in the geothermal loop is lower than a first selected threshold. If the temperature is lower than the first selected threshold, then operating the heat pump system and the auxiliary heat at an increased capacity.

A heat source unit and a refrigeration cycle apparatus that are able to reduce damage to a connection pipe when a refrigerant containing at least 1,2-difluoroethylene is used are provided. An outdoor unit (20) that is connected via a liquid-side connection pipe (6) and a gas-side connection pipe (5) to an indoor unit (30) including an indoor heat exchanger (31) and that is a component of an air conditioner (1) includes a compressor (21) and an outdoor heat exchanger (23). A refrigerant containing at least 1,2-difluoroethylene is used as a refrigerant. A design pressure of the outdoor unit (20) is lower than 1.5 times a design pressure of each of the liquid-side connection pipe (6) and the gas-side connection pipe (5).