Refrigerant compressor with a hermetically sealed housing and a drive unit in the interior of the housing. At least one damping element is in the housing is connected to the drive unit. The damping element has three contact areas separated from each other by an edge, in which in a first deflected state of the drive unit a first contact area contacts a first inner surface area of the housing, wherein in a second deflected state a second contact area contacts a second inner surface area of the housing, but the first contact area does not contact the first inner surface area, wherein in a third deflected state of the drive unit a third contact area contacts a third inner surface area, but the first and second contact areas do not contact the first and second inner surface areas, respectively.

An air conditioner unit includes a variable speed compressor for circulating refrigerant through refrigeration loop and a controller configured to initiate an operating cycle, start a compressor transition timer, and determine an unfiltered compressor speed. The unfiltered compressor speed is fixed based on the selected operating mode until the compressor transition timer reaches a predetermined transition delay time, after which the unfiltered compressor speed is determined using a closed loop feedback control algorithm. The controller is further configured to operating the variable speed compressor at a target compressor speed that is modified from the unfiltered compressor speed based on the identification of a speed modification condition, such as a dehumidification deficiency a speed restriction, or the identification of one or more resonance avoidance zones.

This refrigerant vessel component (2, 4, 7) for a refrigeration circuit (100), comprises a shell (10) extending along a longitudinal axis (X) delimiting an internal volume (V), in which circulates a refrigerant fluid (R), whereas the refrigerant vessel component (2) comprises an inner shell (20) located radially inside the shell (10) and extending on at least a portion of the circumference of the shell (10), and whereas the inner shell (20) is at least partly formed of perforated material.

A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated spectrum of frequencies. The controller further determines one or more resonance frequencies associated with the HVAC system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms wherein the spectrum of frequencies of the first PWM algorithm lacks frequency peaks that overlap with the one or more resonance frequencies associated with the HVAC system. The controller further operates the electronic power converter according to the first PWM algorithm.

A monitoring and/or control device for an environmental control unit such as a heat pump determines the performance status and whether maintenance is required of a component of the unit for example a compressor during operation of the component. The device includes sensors configured to be situated relative to the compressor so as to receive and signal data from the compressor during operation of the component. In some embodiments, the device includes a vibration detector and a controller coupled to the vibration detector. The controller is configured to (i) receive electrical signals from the vibration detector, (ii) compare the electrical signals to a reference signal, (iii) determine the performance characteristic of the component based on the results of the comparison, and (iv) output a signal corresponding to the performance characteristic of the component to a user display. The controller may also request maintenance and/or order parts automatically.

An evaporator for a refrigeration appliance has a refrigerant line, which extends from an injection point to an outlet of the evaporator. A number of heat exchanger plates are in thermal contact with the refrigerant line and with the surroundings of the evaporator. The refrigerant line has, in an upstream region of the evaporator, at least one constriction, which is spaced apart from the injection point.

An air conditioner is disclosed. The air conditioner comprises: a compressor for compressing a refrigerant; a discharge pipe for guiding the refrigerant discharged from the compressor; an accumulator for storing the refrigerant flowing into the compressor from an outdoor heat exchanger or an indoor heat exchanger; a suction pipe for guiding the refrigerant discharged from the accumulator to the compressor; a subcooler disposed in a pipe between the outdoor heat exchanger and the indoor heat exchanger so as to secure a degree of subcooling of the refrigerant; an injection pipe for guiding a refrigerant superheated in the subcooler to the compressor; and a fixing member provided for fixing the discharge pipe, the suction pipe, and the injection pipe together.

A dilution refrigerator is provided. The dilution refrigerator includes a plurality of thermalization plates configured to be cooled to a plurality of temperatures, and a first thermalization plate of the plurality of thermalization plates includes an integrated heat exchanger. The integrated heat exchanger includes channels formed in the first thermalization plate, and the channels are configured to allow helium to flow through the first thermalization plate during operation of the dilution refrigerator to improve heat exchange and cooling power of the dilution refrigerator.

An outdoor unit of a refrigeration cycle apparatus includes a first header pipe and a second header pipe. The first header pipe and the second header pipe are connected to a heat-source-side heat exchanger. The outdoor unit further includes a refrigerant distributor pipe. The refrigerant distributor includes an inflow pipe into which refrigerant discharged from a compressor flows, a splitter pipe connected to the inflow pipe, a first feed pipe connected to the splitter pipe and to a first body portion of a first main pipe of the first header pipe, and a second feed pipe connected to the splitter pipe and to a second body portion of a second main pipe of the second header pipe.

A method of operating a chiller system includes receiving an input from at least one sensor associated with a compressor of the chiller system, determining that the compressor is experiencing a surge or rotating stall event, adjusting at least one operating parameter associated with a heat rejection heat exchanger of the chiller system in response to determining that the compressor is experiencing the surge or rotating stall event, and reducing a condenser saturation temperature by adjusting the at least one operating parameter.