Abstract: A method of assembling a refrigeration unit includes inserting a machine compartment assembly, including a base plate and a compressor coupled to the base plate, into a machine compartment of the refrigeration unit, mounting a control box of the refrigeration unit to a side panel, and coupling the side panel to the refrigeration unit, such that the side panel conceals a lateral side of the machine compartment and the control box is laterally-inboard of the side panel.

Abstract: A compressor operable in a heat pump mode of a refrigerant circuit includes a compression space in which a refrigerant is compressed. The compression space includes a discharge port and an injection port. A discharge chamber is fluidly coupled to the compression space by the discharge port. An injection chamber is fluidly coupled to the compression space by the injection port. A discharge recirculation pathway selectively provides fluid communication between the discharge chamber and the injection chamber. An injection of the recirculated refrigerant into the compression space through the injection port results in an increase in pressure, and hence temperature, of the refrigerant when discharged to the discharge chamber. The increased temperature of the discharged refrigerant increases a heating capacity of a condenser of the associated refrigerant circuit.

Abstract: The current invention provides an evaporative condensing system using an evaporative condenser heat exchanger having an outer surface. The heat exchanger has a superhydrophilic surface. A compressor is configured to circulate a working fluid through the heat exchanger. A water distribution system is adapted to deposit a controlled amount of water on the heat exchanger to absorb heat from the heat exchanger by evaporation of water from the heat exchanger. A collector is located below the heat exchanger to receive excess water from the heat exchanger and direct excess water to a drain and an air delivery system is provided to direct air over the heat exchanger. The water distribution system supplies water to the heat exchanger in sufficient quantity that the water wets the heat exchanger, keeps the heat exchanger wet along its length, and excess water remains to carry dissolved solids to the collector.

Abstract: An air conditioning system is provided and including a solar heat generator configured for collecting solar radiation and for heating fluid by the solar radiation and a fluid container coupled to the solar heat generator and being configured to maintain the heated fluid. The system further includes a heat exchanger disposed inside the fluid container and being configured for transferring heat from the heated fluid to refrigerant inside the heat exchanger, the heat exchanger is configured to increase pressure and temperature of the refrigerant. The system further includes a condenser, an expansion member and an evaporator configured to form together with the heat exchanger an air-conditioning cycle.

Abstract: A method includes receiving, by a processing device and from a variable frequency drive coupled to one or more compressors, operation information of the one or more compressors. The method also includes comparing the operation information of the one or more compressors to an operation threshold and determining that the operation information satisfies the operation threshold. The method also includes changing, based on the determination that the operation information of the one or more compressors satisfies the operation threshold, an operation parameter of a component of the refrigeration system. Changing the operation parameter increases at least one of: (i) a velocity of a working fluid in a piping assembly fluidly coupled to the one or more compressors, or (ii) a flow rate of an oil in the piping assembly flowing into the one or more compressors.

Abstract: An HVAC system includes an evaporator, a condenser, a compressor. A first refrigerant path flows through a first expansion valve, first evaporator inlet, within the evaporator, and out of the evaporator through a first evaporator outlet. A second refrigerant path flows through a second expansion valve, a second evaporator inlet, within the evaporator, and out of the evaporator through a second evaporator outlet. Refrigerant flows from the condenser to the first refrigerant path and the second refrigerant path, and from the first refrigerant path and the second refrigerant path to the compressor.

Abstract: Systems, methods, and computer-readable mediums are provided for improving the efficiency of a filter-type oil separator in a cooling system including a compressor that pumps a mixture of lubricating oil and refrigerant through the filter-type oil separator. The filter type oil separator is configured to receive a first portion of the mixture from the compressor, and a bypass line is configured to bypass a second portion of the mixture around the filter-type oil separator. The bypass line ensures a sufficient amount of oil is present in the compressor.

Abstract: Disclosed is a double wave fin plate for a fin-tube heat exchanger, having: one half-plate having one perimeter edge with one cut-out forming one portion of a tube connector; another half-plate having another perimeter edge with another cut-out forming another portion of the tube connector; the one perimeter edge and the other perimeter edge are connected to one another about each cut-out to form the fin plate and the tube connector; one surface waveform is formed on the one half-plate; another surface waveform is formed on the other half-plate, and the one surface waveform is disposed at an angle to the other surface waveform in the fin plate.

Abstract: A controlled-type recalcitrant high-concentration freeze-separation apparatus, includes: a condenser having therein a condenser stainless antifreeze tube formed in a cell and tube form, and a condenser copper refrigerant tube formed in a cell and tube form inside the stainless antifreeze tube to block direct contact between circulating water flowing into the condenser and the condenser copper refrigerant tube; and an evaporator having therein an evaporator stainless antifreeze tube formed in a form of a cell and tube inside, and an evaporator copper refrigerant tube formed in a cell and tube form inside the evaporator stainless antifreeze tube to block direct contact between circulating water flowing into the evaporator and the evaporator copper refrigerant tube.

Abstract: A heat exchanger, a heat pump system, and a heat exchange method. The heat exchanger operates in a cooling mode or a heating mode. A heat exchange medium flows through via a first flow path within the heat exchanger in the cooling mode, and flows through via a second flow path within the heat exchanger in the heating mode. A diversion component is disposed within the heat exchanger. The diversion component is configured such that the length of the first flow path is different from the length of the second flow path; moreover, a partial segment of the first flow path and a partial segment of the second flow path overlap with each other, and flow directions of the heat exchange medium therein are identical.

Abstract: A heat exchanger includes a heat transfer tube. The heat transfer tube includes a first tube portion, and second tube portions connected in parallel with each other with respect to the first tube portion. The first tube portion has a first inner circumferential surface, and first grooves recessed relative to the first inner circumferential surface and arranged side by side in a circumferential direction of the heat transfer tube. The second tube portions each have a second inner circumferential surface, and a plurality of second grooves recessed relative to the second inner circumferential surface and arranged side by side in the circumferential direction. The first grooves are less than the second grooves in one or more of a number of grooves, a depth of each groove, and a lead angle of each groove.

Abstract: A refrigeration unit includes a storage compartment, an evaporator compartment, an evaporator disposed within the evaporator compartment, a drain pan beneath the evaporator and having first and second sloped surfaces, and a panel between the storage and evaporator compartments that defines an opening. The storage compartment is in fluid communication with the evaporator compartment via the opening. The refrigeration unit also includes an evaporator fan that delivers air from the evaporator compartment to the storage compartment via the opening, and an evaporator fan grille coupled to the panel and extending outward therefrom into the storage compartment. The evaporator fan grille includes a body that extends over the opening and that is in a spaced-relationship with the panel, and at least one spacer feature extending from the panel to the body.

Abstract: A refrigerant cycle apparatus includes a main refrigerant circuit, a bypass circuit, and a controller. The main refrigerant circuit includes a compressor, a heat source-side heat exchanger, a heat source-side expansion valve, and a utilization-side heat exchanger. The controller performs a second operation of opening a hot gas bypass valve in a state in which the compressor is driven before performing a first operation in which the heat source-side heat exchanger serves as a heat absorber for the refrigerant and the utilization-side heat exchanger serves as a radiator for the refrigerant. In the first operation or the second operation, when a difference between a pressure of the refrigerant on the discharge side of the compressor and a pressure of the refrigerant on the suction side of the compressor becomes larger than a first predetermined value, the controller decreases the number of revolutions of the compressor.

Abstract: The disclosed technology includes an air system including a first interlaced microchannel heat exchanger and a second interlaced microchannel heat exchanger. The air system can include a plurality of fluidly separated refrigerant circuits, and each of the refrigerant circuits can be configured to flow through the first interlaced microchannel heat exchanger and the second interlaced microchannel heat exchanger. The first interlaced microchannel heat exchanger can be located indoors, and the second interlaced microchannel heat exchanger can be located outdoors. Each of the refrigerant circuits can include its own compressor and expansion valve.

Abstract: A cooling apparatus includes a heat receiver that evaporates a low pressure heat transfer medium. The apparatus includes a compressor that compresses the evaporated heat transfer medium in a gas phase state, and a condenser that condenses the compressed heat transfer medium. The apparatus includes a receiver tank that receives and stores at least one of the heat transfer medium from any place in a flow path of the medium in the gas phase state that returns the medium to the heat receiver and the condensed medium in a liquid phase state. The apparatus includes an air storage tank that air separated from the heat transfer medium. The apparatus includes a liquid level controller that controls a liquid level in the receiver tank such that the heat transfer medium is stored in the receiver tank at a predetermined liquid level height.

Abstract: A system for measuring oil circulation ratio in a vapor-compression refrigeration system (VCRS) is provided. The system may include an oil separator configured to receive the refrigerant and oil flow from the low-pressure line of the VCRS and output a oil flow and a refrigerant flow. The system may further include an oil collector configured to receive the separated oil flow provided by the oil separator. A valve may control an oil flow from the oil collector to the low-pressure line. A level sensor may measure oil level in the oil collector. The system may close, in response to the oil being at or less than a first level, the valve to collect oil in the oil collector. The system may open, in response to the oil being at or greater than a second level, the valve to release oil from the oil collector to the low-pressure line.

Abstract: A general purpose enclosure is provided. A general purpose enclosure for housing an internal unit and providing complete protection against an ingress of dust and water, comprising a first housing and a second housing. A plurality of cooling fins and one or more pressure ports along an exterior surface of the first housing and the second housing. One or more pressure ports comprising a pneumatic valve, pressure sensor cap and a vent membrane such that pressure venting, and pressure testing may be performed by the one or more pressure ports. A method of assembling a general purpose enclosure to an internal unit, comprising applying the first housing and the second housing to the internal unit such that the first housing and the second housing encompass the internal unit and fastening the first housing to the second house.

Abstract: The present disclosure provides a louvered fin including a leading edge, a trailing edge, and a surface extending between the leading edge and the trailing edge. The surface defines a first set of holes along a first axis, a second set of holes along a second axis and offset from the first set of holes, and a third set of holes along a third axis and offset from the second set of holes. Each of the first axis, the second axis, and the third axis extends substantially parallel to a longitudinal axis of the fin. A first offset distance between the second and first set of holes is greater than a second offset distance between the third and second set of holes. The second and the third set of holes define a substantially obtuse trapezoidal matrix.

Abstract: A heat exchanger includes plural heat transfer tubes disposed with a specified spacing from each other in the up and down direction, and a distributor configured to distribute refrigerant to the heat transfer tubes. The distributor includes a body part, and plural flow-splitting parts, the body part including a first passage in which refrigerant flows upward, the flow-splitting parts communicating with the first passage and with one of the heat transfer tubes. The flow-splitting parts include one or more first flow-splitting parts each communicating with a first heat transfer tube, which is a higher positioned heat transfer tube. The flow-splitting parts include one or more second heat transfer tubes each communicating with a second heat transfer tube positioned below the first heat transfer tube. The refrigerant inlet of the first flow-splitting part communicates with the first passage at a location below the refrigerant inlet of the second flow-splitting part.

Abstract: The disclosed technology includes devices, systems, and methods for heat pump systems configured to operate in low ambient temperatures. The disclosed technology can include a heat pump water heater system having an evaporator, a first compressor configured to compress refrigerant to a first pressure, and a second compressor configured to compress the refrigerant to a second pressure. The second pressure can be greater than the first pressure. The heat pump water heater system can include a preheater configured to receive the refrigerant at the first pressure and heat water and a condenser configured to receive the refrigerant at the second pressure and heat water. The water can be passed through the preheater before being passed through the condenser.