A refrigeration system includes a compressor connected to a first heat exchanger and a second heat exchanger. An expansion device is connected between the first heat exchanger and the second heat exchanger. A ratio of a volume of the first heat exchanger to a volume of the second heat exchanger is between 0.6 and 1.8.

Examples of an electrically powered transport refrigeration unit (TRU) are disclosed. In one example, the TRU may include a refrigeration circuit that includes an electrically powered compressor, an evaporator equipped with an electrically powered blower, and a gas cooler equipped with an electrically powered blower. The TRU may also include a control circuit and a power regulator unit. The power regulator unit may be configured to supply variable DC and/or AC outputs to power components of the refrigeration circuit, and the control circuit may be configured to regulate the variable DC and AC outputs of the power regulator unit so as to control the operation of the TRU. The electrically powered TRU may be configured to use R774 as refrigerant.

A refrigerating and air-conditioning apparatus suppresses liquid backflow to a compressor with a simple configuration, and reduces annual power consumption. An outdoor unit and an indoor unit are connected to each other by a gas-side connecting pipe and a liquid-side connecting pipe to form a refrigerant circuit in which a compressor, a four-way valve, an indoor heat exchanger, a refrigerant heat exchanger, an expansion valve, an outdoor heat exchanger, and an accumulator are sequentially connected. The refrigerant heat exchanger transfers heat between a high-pressure-side refrigerant flowing between the expansion valve and an outdoor-unit liquid pipe connecting portion and a low-pressure-side refrigerant on an outlet side of the accumulator.

An air conditioner is provided. The air conditioner includes a heat pump cycle channel in which a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected with one another in sequence. A resistance channel is disposed between an outlet of the compressor and the outdoor heat exchanger to increase pressure of refrigerant flowing from the outlet to the outdoor heat exchanger.

A motor vehicle may have a cylindrical component having two grooves aligned orthogonally to a cylinder axis, recessed into local areas of a lateral surface, and running parallel to each other, and a blind hole in an end of the cylindrical component. A fastening component for the cylindrical component may include a holding device having a U-shaped socket and a head portion having a through opening. The holding device may be matched to the cylindrical component in such a way that the cylindrical component is positively insertable via the two grooves into the U-shaped socket until the blind hole in the end is in alignment with the through opening in the head portion of the holding device. The fastening arrangement may also have a fastening element that is insertable and screwable through the through opening in the head portion into the blind hole in the cylindrical component.

An accumulator to separates gas refrigerant and liquid refrigerant. The accumulator includes a casing, and a resonance-suppressing member installed in an internal space of the casing. The casing has a cylinder portion having a cylinder axis extending along a vertical direction, an upper lid portion linked with an upper end of the cylinder portion, and a lower lid portion linked with a lower end of the cylinder portion. The resonance-suppressing member is installed at a height position that, in a case in which a standing wave of pressure having a first antinode, a node, and a second antinode from the upper lid portion toward the lower lid portion is generated in the internal space, is near a height position of at least one of the first antinode and the second antinode.

An apparatus includes a first expander, a first load, a first work recovery compressor, a valve, and a first compressor. The first expander expands a refrigerant. The first load uses the refrigerant to cool a space proximate the first load. The work recovery compressor compresses the refrigerant from the first load and is driven by the first expander. The valve reduces the pressure of the refrigerant from the work recovery compressor. The first compressor compresses the refrigerant from the valve.

A reservoir tank includes a first chamber, a second chamber, an inflow port coupled to the first chamber, an outflow port coupled to the second chamber, a partition wall provided to separate the first chamber and the second chamber from each other, and a refrigerant flow port provided in the partition wall to connect the first chamber and the second chamber to each other. When the reservoir tank is viewed in a plan view, at least a portion of a range of an inner wall of the first chamber facing the inflow port is curved in an arc shape.

A reservoir tank includes: a tank main body configured to store a refrigerant within the tank main body; an inflow path configured to allow the refrigerant to flow into the tank main body; an outflow path configured to allow the refrigerant to flow out of the tank main body; a collision member that has a first surface and faces an outlet of the inflow path within the tank main body, wherein the collision member is configured such that the refrigerant flowing out from the outlet of the inflow path collides against the first surface; and an air bubble mixing prevention member that faces an inlet of the outflow path within the tank main body, wherein the air bubble mixing prevention member is configured to prevent air bubbles from getting into the outflow path.

An accumulator, including a housing and a cover body, one end of the housing being open; the housing is internally provided with an accommodating cavity, the accommodating cavity being internally provided with a filter; a peripheral wall of the housing comprises a first thick wall part, the first thick wall part being provided with an inlet channel, and one end of the inlet channel communicating with the accommodating cavity, while the other end of the inlet channel communicates with the outside; one end of an outlet channel communicates with the accommodating cavity by means of the filter, while the other end of the outlet channel communicates with an outer portion of the housing. The accumulator may be directly welded and fixed to a heat exchange core without requiring a pipeline connection, the risk of external leakage being small, and the anti-seismic performance being high.