Abstract: An evaporator for evaporating a phase change refrigerant in a space conditioning system, such as an air conditioner, heat pump or refrigeration system, is provided. The evaporator includes an inlet for introducing the refrigerant into the evaporator, an outlet for discharging the refrigerant from the evaporator and plural conduits defining a plurality of hydraulic flow paths between the inlet and the outlet. In accordance with the invention, a separator is provided to substantially separate liquid refrigerant from vapor refrigerant before the refrigerant is introduced into the evaporator to enhance refrigerant distribution within the evaporator, thereby improving evaporator performance.

Abstract: The invention concerns a refrigerating fluid cycle comprising the standard compressor, condenser, liquid/gas separating reservoir, expansion device and evaporator. The invention is characterized in that a pre-expansion device is placed between the condenser and the reservoir, so as to reduce the fluid pressure until it reaches its saturation vapor pressure. The reservoir can thus contain a variable amount of liquid to compensate the fluid losses in the cycle by maintaining the sub-cooling temperature constant thereby enabling the heat load to be absorbed by the condenser.

Abstract: A refrigeration system is provided with a receiver and a plate attached to the mouth of the outlet tube of the receiver to prevent the formation of a liquid refrigerant vortex. The mouth of the receiver outlet tube has an enlarged cross-sectional area to decrease the velocity of the liquid entering the tube. A deflector for vertical receiver applications interrupts refrigerant downward flow from the receiver inlet to prevent bubble formation in the liquid.

Abstract: A refrigeration system comprising: a duct; a compressor having an inlet and an outlet; a reheat coil located in the duct and having an outlet and an inlet operatively connected to the compressor outlet; and a condenser having an outlet, and an inlet operatively connected to the reheat coil outlet. The system also comprises an expansion device, an evaporator and a receiver system. The expansion device has an outlet, and an inlet operatively connected to the condenser outlet. The evaporator is located in the duct upstream of the reheat coil and has an inlet operatively connected to the expansion device outlet, and has an outlet operatively connected to the compressor inlet. The receiver system has an inlet operatively connected to the condenser outlet and has an outlet operatively connected to the evaporator inlet. The receiver system includes an upstream flow control device, a receiver and a downstream flow control device in series.

Abstract: A flow management device is provided for managing refrigerant flow in a reversible HVAC system. Refrigerant lines from the system heat exchangers connect to bi-directional ports on the flow management device which converts the high pressure refrigerant flowing in one bi-directional port into pressure reduced refrigerant that flows out of the other bi-directional port. The flow management device has multiple bi-directional ports and a flow path for refrigerant extending between the ports. Flow sensitive valves are positioned within the flow path to prevent high pressure refrigerant from flowing between the ports. A pressure reducing device is arranged so that high pressure refrigerant flowing into one of the ports flows through one of the flow sensitive valves and then into the pressure reducing device. Pressure reduced refrigerant emitted from the pressure reducing device flows through a multi-function valve and out the other port.

Abstract: In an air conditioning apparatus, an evaporator is disposed in an air-conditioning case to be inclined relative to a horizontal direction and to form a lower space below the evaporator. Air flows through the evaporator from a lower side toward an upper side thereof in the air-conditioning case. The lower space is partitioned by a partition member into an air-blown space and a drain space, and a drain guide member is disposed in the drain space to approximately contact a lower end portion of the inclined evaporator, where condensed water is gathered. Therefore, it can prevent air from hitting from below against the lower end portion of the evaporator. Consequently, the condensed water that has been gathered at the lower end portion of the inclined evaporator can be discharged rapidly along the drain guide member without being affected by the flow of air, and drips to a bottom surface of the air-conditioning case.

Abstract: There is provided a heat exchanger with a receiver which has a small diameter and compact size without a liquid refrigerant suction pipe.The interior of a header tube 2 is partitioned into three chambers A, C, and F by partition plates 8a and 8b. The chamber C is provided with a refrigerant inlet 6, and the chamber F with a refrigerant outlet 7. Also, the interior of a header tube 3 is partitioned into chambers B, D, and E by partition plates 8c and 9. Receiver connecting flanges 11 are inserted in the side surface of the chambers B and E, and a receiver body 18 is fixed via receiver headers 21. An inlet passage 16 and an outlet passage 17 are formed in the receiver connecting flange 11 and the receiver header 21. A liquid refrigerant entering through the inlet passage 16 after passing through the chamber B drops in the receiver body 18 by gravity, and is conducted through the refrigerant outlet 7 after going through the outlet passage 17, chamber E, heat exchange tubes 4, and chamber F.

Abstract: An air conditioner comprises a refrigeration cycle consisting of a compressor, a heat exchanger, a throttling device, a dryer provided with an adsorbent, a connection piping and a refrigerant. The refrigerant contains a hydrofluorocarbon refrigerant, the adsorbent contains a plurality of bulk particles, and the dryer includes a container, wherein the adsorbent is located within the container, having a pressing means for holding the adsorbent by pressing it. The load of the pressing means is within a range of about 0.5 kg/cm.sup.2 to about 3 kg/cm.sup.2. The container is of a cylindrical shape having a sectional area of "A", the refrigerant is at a circulation rate of "B", and the value of B/A is within a range of about 100 g/min cm.sup.2 to about 400 g/min cm.sup.2.

Abstract: An air-conditioning condenser has a reservoir screwed axially into a base which itself is brazed onto a header box of the condenser. The reservoir communicates with the header box through pipes formed in the base. The condenser is suitable for use in the air conditioning apparatus for automobile passenger compartments.

Abstract: In a refrigerating apparatus using an HFC group refrigerant, the performance is improved by increasing the refrigerating capacity and a stable operation is made possible. In order to achieve this, a cycle system in a refrigerator is structured so as to connect a compressor, a condenser, a liquid receiver and a supercooler in this order. In an air-cooled separation type refrigerator, the liquid receiver is disposed within an air-cooled type condenser unit. Further, in the case where a flush gas is liable to be generated in a liquid pipe, a vapor-liquid separator is disposed within the compressor unit integral with an accumulator and separated therefrom by a partition plate.

Abstract: In a refrigerant cycle system, a gas-liquid separator has a gas-suction pipe for introducing gas refrigerant from the gas-liquid separator to a compressor. The gas-suction pipe has an open end opened in a gas-refrigerant area in the gas-liquid separator, a first suction hole, provided in a liquid-refrigerant area of the gas-liquid separator, for sucking liquid refrigerant containing lubricating oil, and a second suction hole provided in the gas-refrigerant area of the gas-liquid separator. The second suction hole for sucking gas refrigerant is formed in the gas-suction pipe at a downstream refrigerant side of the first suction hole. Therefore, a flow rate of gas refrigerant passing through around the first suction hole in the gas-suction pipe is decreased due to introduction of gas refrigerant by the second suction hole, thereby decreasing quantity of liquid refrigerant sucked from the first suction hole.

Abstract: There is provided a heat exchanger with a receiver which has a small diameter and compact size without a liquid refrigerant suction pipe.The interior of a header tube 2 is partitioned into three chambers A, C, and F by partition plates 8a and 8b. The chamber C is provided with a refrigerant inlet 6, and the chamber F with a refrigerant outlet 7. Also, the interior of a header tube 3 is partitioned into chambers B, D, and E by partition plates 8c and 9. Receiver connecting flanges 11 are inserted in the side surface of the chambers B and E, and a receiver body 18 is fixed via receiver headers 21. An inlet passage 16 and an outlet passage 17 are formed in the receiver connecting flange 11 and the receiver header 21. A liquid refrigerant entering through the inlet passage 16 after passing through the chamber B drops in the receiver body 18 by gravity, and is conducted through the refrigerant outlet 7 after going through the outlet passage 17, chamber E, heat exchange tubes 4, and chamber F.

Abstract: A refrigerant cycle system includes a gas-liquid separator for separating gas-liquid refrigerant into gas refrigerant and liquid refrigerant. The gas-liquid separator has a liquid-suction pipe for introducing liquid refrigerant from the gas-liquid separator to a decompressing unit, and a gas-suction pipe for introducing gas refrigerant from the gas-liquid separator to a compressor. The gas-suction pipe has a suction hole for sucking liquid refrigerant therein, and the suction hole is provided at a position lower than an open end of the liquid-suction pipe. Because a height of a surface of liquid refrigerant in the gas-liquid separator is constantly equal to or higher than the open end of the liquid-suction pipe regardless of change in a heating load of the refrigerant cycle, liquid refrigerant is constantly sucked into the gas-suction pipe from the suction hole.

Abstract: The water heater modified from refrigeration machine or air condition is constructed by adding an apparatus for heat accumulation by means of water parallel to the condenser of the original system, this modified system can be controlled to work as an ordinary refrigeration machine or air conditioner, or to work simultaneously both as a refrigeration machine or air conditioner and also as a water heater, the advantages of this water heater are that it is obtained by a simple modification to the existing refrigeration machine or air conditioner, it can be installed at a remote distance convenienty without decreasing the effectiveness and the safety of the original system, and it can be operated to supply hot water without any additional energy consumption from what being consumed for supplying cold air by an original refrigeration machine or air conditioner itself.

Abstract: In known collectors for condensers of motor vehicle air conditioners, the dryer cartridge is inserted from an upper end into the collector via a spacing rod. According to the invention, the dryer cartridge can be secured by releasable connecting means to the sealing lid, and the sealing lid can be mounted on the end associated with the flow segment of the collector profile.

Abstract: A multistage gaseous and liquid phase separation type condenser has a pair of headers disposed in parallel with each other, and a plurality of flat tubes each connected to the headers at opposite ends thereof and corrugated fins interposed between adjacent flat tubes. Each header is divided by baffles into four chambers. The second header has a receiver and chambers of the second header have communication passageways for placing the chambers of the second header in flow communication with the receiver. The first header has an inlet pipe connected to a middle chamber thereof so as to form an inlet path and an outlet pipe connected to a lower chamber thereof.

Abstract: The invention concerns a condenser for a refrigeration circuit able to have passing through it a refrigeration fluid and comprising a removable reservoir connected to a header of the condenser and able to have the refrigeration fluid passing through it.The reservoir is produced in the form of a replaceable cartridge provided with a connection able to cooperate with a base of conjugate shape which is fixed to the header and connected to the latter by an inlet manifold and an outlet manifold for the refrigeration fluid.Application notably to air conditioning installations for motor vehicles.

Abstract: In a refrigerant circulating apparatus, a liquid accumulating container for allowing oil droplets to flow out in suspended form is connected between a condenser and a pressure reducing device. Thus, refrigerating machine oil which flowed out from a compressor can be reliably returned to the compressor, and proper lubricating and sealing functions can be maintained for the compressing elements.

Abstract: In a tank aggregate body for a receiver tank that achieves vapor/liquid separation of a coolant that has been liquefied at a condenser, a primary body wall portion is formed by rolling a plate material, bonding margins are formed at the two sides continuous to the primary body wall portion, a tank primary body is constituted from the primary body wall portion by abutting the bonding margins and the opening ends of the tank primary body are closed off with caps. A communicating passage for coolant inflow or coolant outflow is formed between the bonding margins by creating a gap between them. By constituting such a receiver tank by press-forming a plate material, the need for separately forming the communicating passage at the receiver tank by using a separate member is eliminated, and the shape of the communicating passage can be varied freely by changing the mode for machining the plate material.

Abstract: A condenser for a motor vehicle air conditioning system, through which a refrigerant fluid flows, comprises a bundle of tubes fitted between two vertical headers, together with a separate reservoir which is installed vertically close to one of the headers. The walls which define the reservoir and associated header have respective vertical passages in the form of slots, each extending over the whole height of the condenser or header. A metal connecting plate has a first longitudinal edge portion and a second longitudinal edge portion, which are received in the respective slots in such a way that the two walls are immobilized against each other in the region of these passages. The connecting plate has at least one cut-out portion or bight through which the refrigerant fluid can flow between the header and the reservoir at a selected location.

Abstract: A liquid tank used in an air-conditioning system to remove air and water from refrigerant received from a condenser 8 before passing it to an evaporator 11 comprises a tank body, a refrigerant inlet port and a refrigerant outlet port. In a first aspect of the invention which ensures excellent air-liquid separation, easy assembly, low cost, simple structure and ready mounting on the condenser 8, the refrigerant inlet port section 33 is formed at a lower portion of the tank body 31, the refrigerant outlet port section 34 is formed below the refrigerant inlet port section 33 and a cylindrical partition 32 is provided at a lower portion of the tank body 31 to stand higher than the refrigerant inlet port section 33 and define between itself and the inner wall of the tank body 31 an induction space 35 into which the refrigerant inlet port section 33 opens and define therein a liquid pooling space 36 with which the refrigerant outlet port section 34 communicates.

Abstract: A quick cooling air conditioning system that preserves high pressure refrigerant, in a portion of the refrigerant path or in a dedicated reservoir, after the shutdown of the air conditioning compressor. The quick air cooling is achieved by the instant application of high pressure refrigerant to the evaporator at the start-up of the air conditioning system.

Abstract: Loss of efficiency as a result of inadequate subcooling caused by the entry of gaseous refrigerant into the subcooling stage of a condenser (20) from a receiver (22) is avoided in a construction wherein an upper inlet (64) to the receiver (22) is canted at an angle (.alpha.,.beta.) with respect to the longitudinal axis (74) of the receiver to induce a vortex flow (130) of refrigerant in the receiver (22). A baffle (106,115,118,121) may advantageously be located between the upper inlet (64) and a lower outlet (66) of the receiver (22) to isolate turbulence within the receiver (22) from the lower outlet (66).

Abstract: A control apparatus for a gas injection type air conditioning system that prevents lowering of compressor speed and cycle stoppage under conditions where high pressure is liable to occur. During a system heating mode, a pressure change rate ASP of the high pressure of the refrigerating cycle is calculated. When a pressure change rate .increment.SP rises above a predetermined value, a system electric expansion valve aperture is reduced. Accordingly, by calculation of the pressure change rate .increment.SP, it is possible to control the electric expansion valve in the above manner earlier than in prior art control schemes when there is a sudden rise in the high pressure.

Abstract: A receiver-integrated condenser for a refrigerating system for use in an automotive vehicle is disclosed. The condenser is composed of a heat exchanging core having many tubes extending horizontally in which refrigerant is cooled down and condensed, a pair of header tanks elongated vertically and connected to both ends of the tubes, and a refrigerant receiver for reserving liquid refrigerant therein integrally connected to one of the header tanks which has an inlet joint for receiving overheated refrigerant from a compressor. The inner space of the header tank to which the receiver is connected is divided by a separator into an upper space for receiving the overheated refrigerant and a lower space for receiving refrigerant cooled down in the heat exchanging core. The receiver is connected integrally to the header tank so that it does not overlap with the upper space of the header tank in order to minimize heat transfer from the upper space to the receiver.

Abstract: A condenser which includes a coolant dispensing section which uniformly dispenses a coolant of high temperature compressed by the compressor, a body which is heat-exchanged with air while the coolant is circulating, and an exit tube which discharges the coolant heat-exchanged with the body. The coolant dispensing section includes a dispenser which uniformly dispenses the coolant, a coolant pipe which connects the compressor and an upper portion of the dispenser, and coolant supply tubes which supply the coolant into the body from the dispenser. The coolant supply tubes are protruded from a side wall of the dispenser by predetermined distances, and end portions of the coolant supply tubes are obliquely cut-away. When the coolant falls toward the bottom of the dispenser from the upper portion of the dispenser, it is introduced into the body through the coolant supply tubes. The coolant is cooled in the body by heat-exchange with the air.

Abstract: A connection block fixed to a condenser is firmly coupled with a mounting block fixed to a liquid tank by means of a bolt. In a state that those are firmly coupled, a supported part of the mounting block is put on a flat supporting face of the connection block. In this state, the refrigerant outlet port of the condenser is communicatively coupled with the refrigerant inlet port of the liquid tank.

Abstract: A condenser for a cooling circuit conveying a refrigerant, including a bundle of tubes mounted between a first collecting box and a second collecting box, an inlet for the gaseous refrigerant, an outlet for the condensed refrigerant, and a reservoir through which the refrigerant may flow. The reservoir is housed in the collecting box and communicates via at least one aperture with a downstream portion of the bundle on the outlet side of the condenser. The condenser is useful for motor vehicle air conditioning.

Abstract: A casing forming a liquid tank is welded through coupling brackets to a first header pipe forming a condenser by brazing. This coupling brackets are smaller in thermal capacity than the casing and the first header pipe.

Abstract: A structure for supporting an electric fan and fixing it to the radiator of a vehicle having climate control, comprising a unitary injection-moulded plastics material body including a rectangular frame, a plurality of arms for fixing the structure to the body of a vehicle, a housing for receiving a rotatable cooling fan and a mount for the electric motor for driving the fan. The structure also includes a support surface and a seat for supporting and fixing a dehydration filter forming part of the climate control system of the vehicle.

Abstract: In a refrigerant condenser including a super-cooling portion, the super cooling portion is located in the upper position of a core portion. Thus, when a vehicle engine idles, and high temperature cooling air having passed through the refrigerant condenser and the vehicle radiator is lead to the air upstream side of the condenser through the lower portion of the condenser, because the super-cooling portion is located at the upper position of the core portion, the super-cooling portion is not influenced by the high temperature air.

Abstract: The present invention provides a condenser with a liquid-receiver that enables the omission of piping for connecting a liquid-receiver and a condenser. The liquid-receiver is connected to the condenser by a liquid-receiver holder. The liquid-receiver holder also is connected to the header of the condenser body. The liquid-receiver is flange connected to the liquid-receiver holder, whereby the liquid-receiver is held to the condenser body and both of them are internally communicated with one another through a passage formed in the liquid-receiver holder.

Abstract: The present invention relates to an improved refrigeration subcooler comprising an accumulator and receiver apparatus for use in a refrigeration unit or heat pump. Specifically, the present invention relates to a subcooler that requires less refrigerant and is operable at lower operating pressures than conventional subcoolers.

Abstract: A receiver is located in a refrigerating circuit that includes a compressor, a condenser, an expansion valve and an evaporator. The receiver receives and temporarily reserves liquefied refrigerant sent from the compressor by way of the condenser. The expansion valve atomizes the liquefied refrigerant sent from the receiver and supplies the atomized refrigerant to the evaporator. The receiver includes a tank for reserving the liquefied refrigerant sent from the condenser and a head portion located on the tank. The head portion houses the expansion valve. The expansion valve includes a restricting mechanism for adjusting the flow rate of the refrigerant supplied to the evaporator from the tank and a control mechanism for controlling the restricting mechanism in accordance with the temperature of the refrigerant transferred to the compressor from the evaporator.

Abstract: A refrigeration apparatus is constructed by connecting a sight glass via a refrigerant pipe at a downstream side of a supercooling unit of an integrated type condenser-receiver. A required capacity VR of a receiver is obtained by subtracting a required capacity V3 for making the sight glass bubble-free from a total of a refrigerant fluctuation buffer amount V1 for accounting differences in the operating conditions of the refrigeration cycle, and an extra capacity to account for leakage of refrigerant from the refrigeration cycle. Therefore, even when the capacity of receiver is reduced by the required capacity V3 for making the sight glass bubble free, gaseous refrigerant containing bubbles flowing from the receiver are all liquified at the supercooling unit and gaseous refrigerant will never reach the sight glass as long as the refrigeration cycle is filled with the sufficient quantity of refrigerant.

Abstract: A unit incorporating a reservoir tank and an expansion valve into a single built-in structure comprises a reservoir tank 10 sealed by a cover 20, and an expansion valve 30 fixed on the cover 20. A refrigerant pipe 40 extending through the cover 20 introduces a refrigerant from a compressor through a condenser into the reservoir tank 10. The refrigerant introduced into the expansion valve 30 through a pipe 50 increases in volume, and then enters an evaporator. After passing the evaporator, the refrigerant in the gaseous phase flows through pipe 62 into the expansion valve 30, then delivers thermal information of the refrigerant to a heat sensitive member of the expansion valve, and travels in a pipe 70 extending into and from the reservoir tank 10. While traveling along the pipe 70, the gaseous refrigerant exchanges heat with the liquid refrigerant stored in the reservoir tank, and then returns to the compressor.

Abstract: A vapor compression refrigeration system having a condenser, a regulating device, and a capillary tube. The regulating device has a housing defining an inner chamber for receiving refrigerant from the condenser. A float is disposed within the chamber and includes a resilient surface. An outlet line connected to the capillary tube extends through a bottom wall of the housing and into the chamber. The float is movable in response to changes in level of refrigerant in the chamber. The float moves downward to close the outlet line when refrigerant in the chamber drops below a minimum level, and moves upward to open the outlet line when refrigerant in the chamber rises above the minimum level. A filter assembly for removing contaminants from the refrigerant is disposed within the chamber above the float.

Abstract: A method of attaching and sealing a fluid conduit to a refrigerant receiver drier of the type formed of an aluminum canister with a welded header in which is formed the inlet and outlet ports. An annular rib is formed in the header about the inlet port. An annular convolution is formed about the conduit to be attached adjacent the end and a resilient seal ring assembled over the tube conduit end and registers against the face or side of the convolution. The end of the tube conduit is then inserted in the port and the annular rib deformed over the convolution to retain the tube conduit in the port and sealed against the seal ring.

Abstract: A geothermal heating and/or cooling system includes one or more of a plurality of features that enhance the efficiency of the system. Preferably, the system includes a subterranean heat exchanger having tubes disposed against a conductive sheet. The system also preferably includes a reservoir vessel for holding a supply of heat transfer fluid in a liquid phase. Also, the system preferably includes heat exchange means for exchanging heat between the heat transfer fluid and the outdoor air. In addition, the system preferably has an automatically adjusting cooling expansion valve controlled by a sensor disposed to detect the pressure or temperature of heat transfer fluid exiting an indoor air handler in a cooling mode, the system also preferably has an automatically adjusting heating expansion valve controlled by a sensor that is preferably located so as to detect the temperature or pressure of heat transfer fluid flowing from the subterranean heat exchanger to a gas compressor.

Abstract: An air conditioner is made to follow up a change in load in an efficient manner by utilizing the fact that the components of a three-component mixed medium serving as a substitute for Freon have different boiling points. The mixed medium, which consists of R-32, R-125 and R-134a, is sealed within the circuit of the air conditioner, and a supercooled heat exchanger and liquid-gas tank are interposed between an outdoor heat exchanger and an expansion valve. The liquid-gas tank is connected to an accumulator via a liquid injection valve.

Abstract: Conventional vapor-compression refrigeration systems modified for greater efficiencies by installation of a liquid refrigerant level sensor in the drain line after the condenser, the sensor activating a valve in the high pressure vapor line in communication with the refrigerant receiver or reservoir, and the drain line being trapped to prevent vapor in the reservoir from backing up into the condenser.

Abstract: A heat pump installation, especially an air conditioning installation for a motor vehicle, includes a unit consisting of a refrigerant fluid reservoir which comprises a vessel closed by a cover which carries an expansion device. The expansion device is connected firstly to an inlet chamber formed in the reservoir and containing a dehumidifying filter, and secondly to an outlet chamber formed in the reservoir and separated from the inlet chamber by a separating member. The separating member is trapped between the cover and the vessel.

Abstract: A device for increasing heat transfer and reducing suspended vapor within a fluid. The inventive device includes a main body having at least one pair of conduits positionable into communication with a fluid or refrigerant line. A radial diffuser effects plating or coating of fluid entering the main body onto the interior walls thereof to increase heat transfer. A radial infuser receives collected fluid and directs the fluid into a containment chamber within the main body. A rotational turbulence inducer agitates the fluid as it exits the main body for increasing heat transfer between the fluid and the conduit. Alternative forms of the invention include a turbine mounted within the containment chamber for extracting rotational torque from movement of fluid through the device, and a lower main body having a pair of selectively valved radial infusers permitting reverse flow through the device.

Abstract: In a vapor compression refrigeration system an improvement for isolating the compressor from work on a substantial component of refrigerant flashing to vapor upstream of the evaporator, wherein refrigerant liquid from the condenser is collected in a holding vessel from which it is intermittently emptied into an expansion device thereby generating flash vapor in the holding vessel which is prevented from passing through the expansion device and evaporator for return to the compressor.

Abstract: A second header pipe forming a second header of a refrigerant condenser and a receiver are joined by brazing. In a portion where the second header pipe and receiver are communicated, four ribs provided at a perimeter of a communication hole of the second header pipe are inserted within a communication hole of the receiver, and thereafter ribs are bent in an outer direction of the hole, and the second header and the receiver are provisionally joined at the communication-hole portion prior to brazing. Additionally, after a projection provided on an upper-side cap of the receiver has been inserted into an insertion hole provided in the second header pipe, an end portion thereof is widened outwardly, and the second header pipe and receiver are provisionally joined prior to brazing. In this way, both ends of the receiver are provisionally joined to the second header pipe prior to brazing, and so the second header and the receiver do not slip during brazing.

Abstract: Both a system and method are provided for achieving temperature control in a refrigeration circuit by providing a bypass flow of saturated, gaseous refrigerant from the receiver tank to a point in the circuit downstream of the evaporator coil. The system includes a bypass conduit for conducting a bypass flow of saturated, gaseous refrigerant from an upper portion of the receiver tank to a point in the circuit between the evaporator coil and a suction line throttling valve to partially offset the cooling of the evaporator coil from the expansion valve. The bypass conduit includes a valve mechanism for modulating this flow to achieve a desired temperature setpoint. The system also includes a temperature monitoring sensor located in a space conditioned by the refrigeration circuit, as well as a microprocessor. The input of the microprocessor receives an electrical signal generated by the monitoring sensor indicative of the temperature of the space.

Abstract: A condenser and a subcondenser are provided between a couple of header pipes, and a liquid tank is provided by the side of the header pipe. Liquid refrigerant that is discharged from the condenser enters the subcondenser after passing through the liquid tank. The liquid tank is detachably mounted on the header pipe.

Abstract: A refrigeration system has a compressor operable to supply compressed refrigerant vapor, a condenser to liquify compressed refrigerant vapour from the compressor, a thermostatic expansion valve to vaporize liquified refrigerant from the condenser, an evaporator to cool the surrounding atmosphere by vaporized refrigerant from the thermostatic expansion valve, a superheat sensor to improve control of the thermostatic expansion valve, a compressor discharge line to convey compressed refrigerant vapour from the compressor to the condenser, a return line to convey liquified refrigerant from the condenser to the expansion valve, and a suction line including the superheat sensor to convey vaporized refrigerant from the evaporator to the compressor.

Abstract: A gas-liquid separator for a heat pump type air conditioning system using a gas-injection cycle, which system can switch its mode of operation between heating and cooling modes, includes a reservoir for receiving refrigerant in a gas-liquid two-phase flow, an exit port which opens at a upper portion of the reservoir and allows a refrigerant gas to flow out of the reservoir, first and second ports which are provided at a upper part within the reservoir above the level of a refrigerant liquid and allows the refrigerant to flow into and out of the reservoir.

Abstract: A modulator in a coolant recirculation line for a refrigerating apparatus. The modulator is used for storing an excess amount of the coolant recirculated in the system. The modulator has a space extending vertically, upward and a bottom end connected to the recirculating line at a position downstream of a condenser, in such a manner that only a part of the coolant passed through the condenser is introduced into the modulator to compensate for variations in the amount of coolant needed for recirculation in the system. The modulator can be arranged in the middle of the heat exchanger, and defines therein a boundary between the liquid phase and the gas phase, for a separation of the gas from the coolant, so that the portion of the heat exchanger downstream of the modulator can operate as a super cooler.