Described is a regulation apparatus for a refrigeration plant having defined therein a refrigerant fluid path and a plurality of devices arranged along the refrigerant fluid path. The regulation apparatus includes a first sensor arranged in a first point (P1) and a second sensor arranged in a second point (P3), each along the fluid path of the refrigeration plant, a control unit and an actuation device. The control unit controls a first value measured by the first sensor and obtains a first regulation request deriving from the first measured value as well as a second value measured by the second sensor and derives a second regulation request deriving from the second measured value, compares the first and second regulation requests, and establishes which regulation request is greater. The control unit also commands the actuation device to actuate the most effective regulation request of the refrigeration plant devices.

A refrigeration system, according to the present invention, has a standard refrigeration circuit, with a condenser connected to a low temperature evaporator and a medium temperature evaporator by a high-pressure liquid line, which are in turn connected to a compressor by a low-pressure vapour return line and a medium-pressure vapour return line, and the compressor is connected to the condenser by a high-pressure vapour line. A low-pressure booster is connected on the low-pressure vapour return line operating at a low compression ratio to boost the pressure of the low-pressure vapour return line to substantially the same pressure as the medium-pressure vapour return line.

A refrigeration system, according to the present invention, has a standard refrigeration circuit, with a condenser connected to a low temperature evaporator and a medium temperature evaporator by a high-pressure liquid line, which are in turn connected to a compressor by a low-pressure vapour return line and a medium-pressure vapour return line, and the compressor is connected to the condenser by a high-pressure vapour line. A low-pressure booster is connected on the low-pressure vapour return line operating at a low compression ratio to boost the pressure of the low-pressure vapour return line to substantially the same pressure as the medium-pressure vapour return line.

Disclosed is a heat exchanger, including: at least two heat exchange tube groups—wherein each heat exchange tube group includes at least two heat exchange tubes; and a connecting member, wherein the at least two heat exchange tubes are communicated with each other by the connecting member—the at least two heat exchange tube groups are connected by the connecting member, and the at least two heat exchange tube groups are not communicated with each other. The heat exchanger solves a problem that the structure of the heat exchanger with an A type structure in a technology known to inventors is complicated.

A heat exchanger (100), a heat exchanger module (100′) having the heat exchanger (100), and an air conditioning system having the heat exchanger (100) or the heat exchanger module (100′); the heat exchanger (100) comprises: a first header (11) and a second header (12), with an axis of the first header (11) being inclined relative to an axis of the second header (12); and a heat exchange pipe (2) connected to the first header (11) and the second header (12), the heat exchange pipe (2) being bent. The heat exchange efficiency can be increased by using the heat exchanger (100).

A heat exchanger (100), a heat exchanger module (100′) having the heat exchanger (100), and an air conditioning system having the heat exchanger (100) or the heat exchanger module (100′); the heat exchanger (100) comprises: a first header (11) and a second header (12), with an axis of the first header (11) being inclined relative to an axis of the second header (12); and a heat exchange pipe (2) connected to the first header (11) and the second header (12), the heat exchange pipe (2) being bent. The heat exchange efficiency can be increased by using the heat exchanger (100).

A heat exchanger includes: a main body; and a tube sheet that is bonded to the main body with a brazing material and is used to fix the main body to a support by a fixing member. The tube sheet includes: a bonding surface to which the brazing material is applied; a rising portion that rises from the bonding surface; and a through-hole through which the fixing member is passed. The through-hole is opened at the rising portion, penetrates the tube sheet, and has an inner peripheral surface to which the brazing material is not applied. The main body includes heat transfer tubes through which refrigerant flows, and the tube sheet is bonded to surface of the heat transfer tube.

In one instance, a multistage microchannel condenser is provided for use as an aspect of a heating, ventilating, and air conditioning (HVAC) system. The multistage microchannel condenser includes at least two pluralities of flat tubes having microchannels, each associated with a different refrigeration circuit, that are interspersed so that when only one refrigeration circuit is operational, the multistage microchannel condenser still does not have any substantial thermal dead spots. Manifolds are used on each end of the multistage microchannel condenser to fluidly couple members of the at least two pluralities of flat tubes such that the refrigerant in each refrigeration circuit remains separated while still using a majority of the area of the face of the multistage microchannel condenser. Other aspects are presented.

In one instance, a multistage microchannel condenser is provided for use as an aspect of a heating, ventilating, and air conditioning (HVAC) system. The multistage microchannel condenser includes at least two pluralities of flat tubes having microchannels, each associated with a different refrigeration circuit, that are interspersed so that when only one refrigeration circuit is operational, the multistage microchannel condenser still does not have any substantial thermal dead spots. Manifolds are used on each end of the multistage microchannel condenser to fluidly couple members of the at least two pluralities of flat tubes such that the refrigerant in each refrigeration circuit remains separated while still using a majority of the area of the face of the multistage microchannel condenser. Other aspects are presented.

A multi-channel heat exchanger includes a plurality of heat exchange tubes, each heat exchange tube includes first to fourth heat exchange tube portions which are distributed along a direction from an airflow inlet side to an airflow outlet side. Each heat exchange tube portion includes at least two flow channels. The heat exchange tube has a cross section defined in a thickness direction and a width direction of the heat exchange tubes, and the cross section includes a flow section. A total area of a flow section of the first heat exchange tube portion is A1, a total area of a flow section of the fourth heat exchange tube portion is A4, and the total area A1 of the flow section of the first heat exchange tube portion is 1.05-1.4 times of the total area A4 of the flow section of the fourth heat exchange tube portion.