A heat-pump circuit may include an indoor heat exchanger, an outdoor heat exchanger, a compressor adapted to circulate a working fluid between the indoor and outdoor heat exchangers, and an expansion device disposed between the indoor and outdoor heat exchangers. A monitor for the heat-pump system may include a return-air temperature sensor, a supply-air temperature sensor, and a processor. The return-air temperature sensor may be adapted to measure a first air temperature of air upstream of the indoor heat exchanger. The supply-air temperature sensor may be adapted to measure a second air temperature of air downstream of the indoor heat exchanger. The processor may be in communication with the return-air temperature sensor and the supply-air temperature sensor. The processor may be programmed to determine a working-fluid-charge condition of the heat-pump system based on the first and second air temperatures.

An air conditioner may include an outdoor unit having a compressor; at least one indoor unit having an indoor heat exchanger, an indoor expansion valve, and a leak sensor that senses leakage of the refrigerant; a gaseous line; a liquid line; a first shut-off valve disposed adjacent to the at least one indoor unit that opens and closes the gaseous line; a second shut-off valve disposed adjacent to the at least one indoor unit that opens and closes the liquid line; a subcooling pipe branched from the liquid line and connected to an inlet of the compressor; a subcooling expansion valve that expands refrigerant, flowing through the subcooling pipe; and a controller configured to control operation of the compressor and to control opening and closing of the first shut-off valve, the second shut-off valve, the indoor expansion valve, and the subcooling expansion valve.

A moisture treatment and leak sealant product for a vapor-compression system has two separate components. One of the components includes a viscosity modifying additive, excluding oil compounds, to more closely match a viscosity of the product to that of lubricating oil in the system and a drying agent to remove moisture from the system. The second of the components includes a silane leak sealant and also the viscosity modifying additive.

An expander-integrated compressor is provided and includes: a motor; a compressor connected to an output shaft of the motor; an expander connected to the output shaft of the motor; a non-contact bearing disposed between the compressor and the expander; a casing; and an extraction line being in communicated with a region between the compressor and the expander in the internal space of the casing and extracts, from the region, the leakage fluid from the compressor side toward the expander side in the casing and to send the leakage fluid to a fluid line connected to the intake side or the discharge side of the compressor outside the casing. The casing seals the region from outside of the casing, thus the flow of the at least a part of the leakage fluid through the extraction line is the only flow of fluid between the region and the outside of the casing.

An outdoor unit is configured to include a compressor and a heat source side heat exchanger. Indoor units are configured to include first expansion devices and use side heat exchangers, and air-condition an air-conditioned space. Branching devices, connected by pipes to the outdoor unit by a plurality of main pipes and connected by pipes to each indoor unit by a plurality of branch pipes, are configured to branch a refrigerant from a side of the main pipes and circulate the refrigerant to the branch pipes, and converge the refrigerant from a side of the branch pipes and circulate the refrigerant to the main pipes. A refrigerant concentration detecting device is installed in a non-air-conditioned space. A shutoff valve control device is configured, upon determining that the refrigerant has leaked, to control shutoff devices and to shut off the refrigerant flows.

Embodiments of the disclosure describe systems and methods for controlling operation of a Transport Refrigeration Unit (TRU) of a vehicle, the vehicle comprising a container configured to store cargo. The method comprises receiving first input information from at least one sensor positioned inside the container. Further, the method comprises determining a current amount of cargo load in the container based on the received first input information from the at least one sensor. Furthermore, the method comprises controlling operation of the TRU by setting one or more temperature regulation parameters for the container based on the determined current amount of cargo load in the container. Further, the operation of the TRU is controlled by triggering a specific type of security mode, among a plurality of modes, in response to detecting a type of refrigerant leak in the vehicle.

A display device which displays operation information of an air conditioner in which an outdoor machine including an outdoor heat exchanger and an indoor machine including an indoor heat exchanger are connected. The display device includes a control unit that determines whether or not abnormality occurs in the outdoor machine or the indoor machine when the air conditioner operates, and a display unit which is controlled by the control unit so as to display time information and to display a plurality of operation information display regions for displaying operation information corresponding to the time information, in line. In a case where the control unit determines that the abnormality has occurred in the outdoor machine or the indoor machine, the control unit controls the display unit to display operation information of the outdoor machine or the indoor machine in which the abnormality has occurred, in the operation information display region.

An air conditioning apparatus with a refrigerant circuit includes a connecting portion to which a first electric wire and a second electric wire are connected. The first and second electric wires are connected to corresponding first and second devices of a plurality of safety devices. The plurality of safety devices includes at least two types of a refrigerant detector, an alarm device, an isolation valve, and a ventilation device. A circuit configuration portion forms an interlock circuit with the first electric wire and the second electric wire connected to the connecting portion. A first member enables formation of a first circuit including at least part of the circuit configuration portion and not including both the first electric wire and the second electric wire. A controller prohibits an operation of the air conditioning apparatus when no current flows through either the interlock circuit or the first circuit.

A heat pump apparatus includes a refrigerant circuit for circulating combustible refrigerant, and a load unit to be provided in a room and configured to accommodate a load side heat exchanger. The load side heat exchanger allows heat exchange between the combustible refrigerant and a liquid heat medium. The load unit includes a fan, an air inlet for sucking in air from the room, and an air outlet for blowing out the air, sucked in from the air inlet, to the room. The air outlet is provided at a position of a height different from the height of the air inlet.

A failsafe hydrocarbon-based gas (HBG) leak detection (HLD) and mitigation (HLM) system/method for use in heating, ventilation, and air conditioning (HVAC) systems that incorporates a hydrocarbon gas sensor (HGS), sensor signal conditioner (SSC), alarm status indicator (ASI), and digital control processor (DCP) is disclosed. The HGS detects ambient hydrocarbon gas (AHG) and presents a hydrocarbon sensor voltage (HSV) to the SSC. The DCP and SSC form a closed control loop (CCL) in which the SSC electrical characteristics are adjusted by the DCP such that the HSV is continuously and dynamically recalibrated to account for background HBG levels, changes in ambient air conditions, HGS manufacturing tolerances, and other field-specific operational conditions that impact the HGS detection capabilities. The DCP is configured to log alarms to the ASI if a HGS HBG leak is detected and optionally shutdown gas flow to one or more HBG target (HBT) system components.