The invention relates to an electronic control device (13) for a refrigerant compressor, comprising at least: a drive unit (18); and a compression mechanism (5) which is actively connected to the drive unit (18), with at least one piston (9) which is driven by a crankshaft (6) and moves back and forth between a lower and an upper dead point in a cylinder of a cylinder block (8), in which the electronic control device (13) is designed to detect, control and/or regulate the rotational speed () of the drive unit (18) and to at least approximately detect the piston position, and in which the electronic control device (13) is designed to drive the compression mechanism (5) by means of the drive unit (18) in such a way that at least one drive angle segment () and at least one transit angle segment () is provided for the duration of a regulating time interval (t) comprising more than one crankshaft rotation, for a plurality of crankshaft rotations, preferably for each crankshaft rotation of the regulating time interval (t), and the compression mechanism (5) is subject to a positive operating torque (Bm) during the at least one drive angle segment (), and to a smaller positive operating torque (Bmv) compared to the positive operating torque (Bm) or to no positive operating torque (Bm) during the at least one transit angle segment ().

A valve structure that may control the flow rate of a fluid with high precision when the fluid starts to be released is provided. In a valve structure 20 including a valve sheet 3 having two outlets 3a to release a fluid and a valve body 4 arranged to be rotational against the valve sheet 3 to regulate a degree of opening of the outlet 3a, the valve body 4 has a fluid control recess 4d formed in the circumferential direction whose area overlapping the outlet 3a is changed by rotation of the valve body 4, and the center O of the outlet 3a is forced to deviate from a rotation trajectory of a front end portion 4b of the fluid control recess 4d that starts to overlap the outlet 3a by the rotation of the valve body 4.

A freezing refrigerator heats an entrance side pipe of evaporator, which is difficult to heat in the related art, with the condensation latent heat of refrigerant that builds up in a lower portion of evaporator in a liquid state while being vaporized with the heat of defrosting heater so as to warm the outlet pipe by a second thermal coupling part thermally coupling an inlet pipe and an outlet pipe of evaporator, whereby temperature variation of the entire evaporator in a defrosting operation can be suppressed, and the power consumption of defrosting heater can be reduced.

This cold generation device implements the Joule-Thomson expansion principle. It includes a heat exchanger having a fluid under high pressure and under low pressure circulating in counterflow therethrough. The heat exchanger is formed of the stack of pellets (5) made of a porous material, and particularly a sintered material, forming a cylindrical mandrel, having a capillary (10) wound at the periphery thereof and in contact therewith, the capillary having the high-pressure fluid circulating therethrough, the low-pressure fluid circulating in counterflow inside of the porous mandrel thus formed.

A refrigerator includes a compressor to compress refrigerant, a condenser to liquefy the refrigerant supplied from the compressor, a capillary tube to decompress and expand the refrigerant supplied from the condenser, an evaporator to vaporize the refrigerant supplied from the capillary tube, a shutoff valve installed at an inlet of the capillary tube so as to prevent the refrigerant in the condenser during stoppage of the compressor from being moved to the evaporator, and a control unit to enable the shutoff valve to be blocked together so as to prevent movement of the refrigerant from the condenser to the evaporator during stoppage of the compressor, and to enable the shutoff valve to be opened together so as to move the refrigerant from the condenser to the evaporator during starting of the compressor.

A refrigeration system including a suction line heat exchanger having a first conduit including a refrigerant liquid which flows inside of the first conduit from the condenser to the evaporator. Also the refrigeration system includes a second conduit in thermal communication with the first conduit and includes a refrigerant fluid, typically a vapor, which flows inside of the second conduit in an opposite direction of flow from the first conduit from the evaporator to the compressor. Additionally, at least one heating device is in thermal communication with at least one of the first conduit and second conduit and is configured to communicate with a refrigeration control system to apply heat along a portion of both the first conduit and the second conduit adjacent to the heating device thereby regulating the flow rate of the refrigerant liquid in the first conduit and the second conduit.

A refrigeration device has a first storage chamber, a second storage chamber and a refrigerant circuit, in which a first controllable throttle point, a first heat exchanger for controlling the temperature of the first storage chamber, a second controllable throttle point and a second heat exchanger for cooling the second storage chamber are connected in series between a pressure connection and a suction connection. A hot line section, located upstream of the second heat exchanger, and a cold line section, located downstream of the second heat exchanger, are routed in thermal contact with respect to one another in order to form an internal heat exchanger. The first heat exchanger is connected to the pressure connection bypassing the hot line section.

A single-circuit refrigerator includes a refrigerant circuit in which the following are connected in series one after another between a pressure port and an intake port of a compressor: a condenser, a first throttle section, a first evaporator for cooling a first temperature zone of the single-circuit refrigerator, a second throttle section, a second evaporator for cooling a second temperature zone of the single circuit refrigerator, and an intake line. A downstream section of the intake line is connected with the first throttle section to form a first heat exchanger, and an upstream section of the intake line is connected with the second throttle section to form a second heat exchanger.

An embodiment of the present invention relates to a deep freezer. A deep freezer according to an embodiment of the present invention comprises a plurality of heat exchangers installed to an inlet pipe and performing a heat exchange of a mixed refrigerant suctioned into a compressor. The mixed refrigerant comprises: a high temperature refrigerant which is one selected from among butane (N-butane), 1-butene, and isobutane; and a low temperature refrigerant consisting of ethylene.

A microchannel condenser includes a first header, the first header including a body defining an interior and further defining an inlet bore and a first outlet bore, and a second header spaced apart from the first header, the second header including a body defining an interior and further defining a second outlet bore. The microchannel condenser further includes a conduit in fluid communication with the second outlet bore. The microchannel condenser further includes a plurality of tubes extending between the first header and the second header, each of the plurality of tubes defining a plurality of microchannels, each of the plurality of microchannels in fluid communication with the interior of the first header and the interior of the second header, each of the plurality of microchannels having a maximum cross-sectional width of less than or equal to 5 millimeters.