Abstract: A heat exchange unit that performs at least one of a cooling and a heating of a liquid medium that is sent to a utilization side equipment includes: a heat exchanger that exchanges heat between a flammable refrigerant and the liquid medium; an electric component as an ignition source; a casing that accommodates the heat exchanger and the electric component; and a gas detection sensor with a detection element that is disposed below the electric component and that detects a gas from the flammable refrigerant.

Abstract: A heat exchange unit performs at least one of a cooling and a heating of a liquid medium that is sent to a utilization side equipment. The heat exchanging unit includes: a heat exchanger that exchanges heat between a flammable refrigerant and the liquid medium; a casing that accommodates the heat exchanger; a drain pan with a bottom plate and a side wall that extends upward from the bottom plate; and a first gas detection sensor that detects presence or absence of a gas of the refrigerant in an internal space of the drain pan. The internal space is a space within the drain pan that is surrounded by the bottom plate, the side wall, and a virtual plane passing through an upper end part of the side wall. The drain pan is disposed below the heat exchanger in a lower part of the casing.

Abstract: Provided is a measure against a refrigerant leak. A heat load processing system includes: a heat exchanger unit including a heat exchanger; a refrigerant leak detector; and a controller that controls an operation of a ventilator. The heat exchanger is connected to a refrigerant pipe through which a refrigerant flows and a heat medium pipe through which a heat medium flows, and configured to cause the refrigerant and the heat medium to exchange heat with each other. The refrigerant leak detector detects a refrigerant leak in the heat exchanger unit. The ventilator ventilates in a facility device room where the heat exchanger unit is installed. When a refrigerant leak is detected by the refrigerant leak detector, the controller executes a process (a refrigerant leak third control) of increasing a ventilation air volume of the ventilator.

Abstract: Provided is a measure against a refrigerant leak. A heat load processing system has a plurality of refrigerant circuits and includes a plurality of device units, a casing that collectively houses the plurality of device units configuring the different refrigerant circuits, a refrigerant leak detector that individually detects a refrigerant leak in the respective refrigerant circuits, and a controller. The device units include a heat exchanger that is connected to a refrigerant pipe and a heat medium pipe as a device configuring one of the refrigerant circuits. When the refrigerant leak detector detects the refrigerant leak, the controller performs refrigerant leaking circuit identification processing for identifying a refrigerant circuit in which the refrigerant leak is occurring and a refrigerant leak third control for changing an operating state of a predetermined refrigerant circuit based on a result of the refrigerant leaking circuit identification processing.

Abstract: A refrigerator has a discharge three-way valve (8) for connecting the discharge side of a compressor (1) to at least either a hot water heat exchanger (3) or an air heat exchanger (6) and has a suction three-way valve (9) for connecting the suction side of the compressor (1) to at least either the air heat exchanger (6) or a cold water heat exchanger (4). In an operation primarily for cooling, a controller (19) regulates the opening of the discharge three-way valve (8) such that a refrigerant with a flow rate higher than a minimum flow rate (Qs) determined based on an outside air temperature flows to the air heat exchanger (6).

Abstract: A refrigerator includes a compressor compressing a refrigerant, a first liquid heat exchanger performing heat exchange between the refrigerant and a first liquid heat medium, an expander expanding the refrigerant, a second liquid heat exchanger performing heat exchange between the refrigerant and a second liquid heat medium, an air heat exchanger performing heat exchange between the refrigerant and air, a blower sending air to the air heat exchanger, a refrigerant flow rate regulator regulating a flow rate of the refrigerant of the first liquid heat exchanger, the second liquid heat exchanger and the air heat exchanger, a pressure sensor detecting a pressure value of the refrigerant of the air heat exchanger, a target pressure value setter setting a target pressure value of the refrigerant of the air heat exchanger in accordance with a target temperature value of the first liquid heat medium, and a blower controller controlling the blower so that the detection value of the pressure sensor becomes the target p

Abstract: A refrigerator includes a compressor compressing a refrigerant, a first liquid heat exchanger performing heat exchange between the refrigerant and a first liquid heat medium, an expander expanding the refrigerant, a second liquid heat exchanger performing heat exchange between the refrigerant and a second liquid heat medium, an air heat exchanger performing heat exchange between the refrigerant and air, a blower sending air to the air heat exchanger, a refrigerant flow rate regulator regulating a flow rate of the refrigerant of the first liquid heat exchanger, the second liquid heat exchanger and the air heat exchanger, a pressure sensor detecting a pressure value of the refrigerant of the air heat exchanger, a target pressure value setter setting a target pressure value of the refrigerant of the air heat exchanger in accordance with a target temperature value of the first liquid heat medium, and a blower controller controlling the blower so that the detection value of the pressure sensor becomes the target p

Abstract: A refrigerator has a discharge three-way valve (8) for connecting the discharge side of a compressor (1) to at least either a hot water heat exchanger (3) or an air heat exchanger (6) and has a suction three-way valve (9) for connecting the suction side of the compressor (1) to at least either the air heat exchanger (6) or a cold water heat exchanger (4). In an operation primarily for cooling, a controller (19) regulates the opening of the discharge three-way valve (8) such that a refrigerant with a flow rate higher than a minimum flow rate (Qs) determined based on an outside air temperature flows to the air heat exchanger (6).