Abstract: A transcritical vapor compression system includes a fluid circuit circulating a refrigerant in a closed loop. The fluid circuit has operably disposed therein, in serial order, a compressor, a first heat exchanger, at least one non-variable expansion device and a second heat exchanger. The compressor compresses the refrigerant from a low pressure to a supercritical pressure. The first heat exchanger is positioned in a high pressure side of the fluid circuit. The second heat exchanger is positioned in a low pressure side of the fluid circuit. The at least one non-variable expansion device reduces the pressure of the refrigerant from a supercritical pressure to a relatively lower pressure. A refrigerant storage vessel is in fluid communication with the fluid circuit and contains a variable mass of refrigerant whereby the capacity of the system may be controlled.

Abstract: A blowoff valve assembly includes a diaphragm separating a refrigerant connection from an ambient port open to the atmosphere. The refrigerant connection is preferably connected to air conditioning system such that the diaphragm is in contact with refrigerant from the system. The diaphragm is deflectable based on the pressure of the refrigerant and is operatively connected to a switch. When pressure of the refrigerant drops to a predetermined level, the diaphragm deflects to activate the switch. Additionally, the assembly also includes a detonable squib that explodes and ruptures the diaphragm, allowing the refrigerant to flow from the refrigerant connection to the atmosphere. Additional features, such as sensors for detecting refrigerant outside of the system, a collision subsystem, and an associated controller are also disclosed.

Abstract: A method, system and apparatus for transferring a measured level of liquefied refrigerant to a refrigeration system includes the steps of purging a calibration container; filling the calibration container with liquefied refrigerant from a liquefied refrigerant supply to a desired level; and charging a system with the liquefied refrigerant from the calibration container.

Abstract: An automotive air conditioning refrigerant recycling system incorporates an improved upstream oil separator that removes virtually all contaminating lubricants from a refrigerant stream before the refrigerant is delivered to sensitive downstream components of the recycling system. The oil separator includes a vaporizing chamber wherein refrigerant vaporizes while dissolved lubricants precipitate and a mist arrestor for trapping remaining lubricant entrained in the refrigerant vapor. The oil separator also may incorporate a temperature controller for controlling the temperature of the refrigerant stream in order to separate other contaminants such as hexane and hexane derivatives, Menthol Chloride, Isoparafins and other contaminants from the stream. A bi-directional valve allows refrigerant to move through the chamber in one direction and bypass the chamber in the opposite direction.

Abstract: The invention relates to an air conditioning system for motor vehicles, which contains a connection piece for a pressure switch/pressure sensor, said connection piece being suitable for evacuating and filling the air conditioning system after the removal of the pressure switch/pressure sensor, so that the two normally separate functions are combined in one connection piece.

Abstract: Fluid decontamination device includes a base having a fluid passage in it. An observation window is provided in the base for allowing a user to observe a fluid in the fluid passage. A differential pressure indicator, such as a vacuum indicator, is operatively connected to the fluid passage for indicating the relative pressure in the fluid. An indicator light which turns on when the differential pressure in the fluid passage is less than a predetermined differential pressure may be provided on the differential pressure indicator. A filter may be fluidly connected with the fluid passage for filtering out one or more contaminants present in the fluid.

Abstract: A multi-type refrigerator is capable of achieving a high coefficient of performance (COP) while using R32 as refrigerant and that takes account of energy saving and global warming. Refrigerating cycles are executed by circulation of R32 as refrigerant through a refrigerant circuit including one outdoor unit having a compressor, a condenser, and expansion means and a plurality of indoor units having evaporators. A filling quantity of R32 for the refrigerant circuit is set in a range from 120 to 300 g/kW (refrigerating capacity). The filling quantity of R32 for the refrigerant circuit is set in a range from 84 to 300 g/L (internal volume of the condenser).

Abstract: An air conditioning system includes a supplemental storage container that allows for transferring refrigerant into or out of an air conditioning or refrigeration system based upon different operating conditions. In one example, a controller controls the operation of valves that selectively couple the storage container to the high pressure side or the low pressure side of the system. Depending on operating conditions, when it is desirable to increase an amount of refrigerant in the system, refrigerant is transferred from the storage container to the low pressure side of the air conditioning or refrigeration system. Under conditions where the amount of refrigerant in the system is above a desired amount, refrigerant can be transferred from the high side of air conditioning system to the storage container to bring the pressure within the system closer to the desired level.

Abstract: An air conditioning or refrigeration system includes an attached refrigerant receptacle associated with the system. During shipment or storage, the pressure within the system may exceed a selected threshold for the low pressure side. Under such circumstances, a pressure relief device automatically allows refrigerant to flow from the system into the attached receptacle, which brings the pressure within the system back to an acceptable level for the low pressure side. Various optional shutoff devices are disclosed that can be incorporated into the design to simplify receptacle removal or recycling.

Abstract: An air conditioning, heating or refrigeration system includes a controller that automatically determines if refrigerant amount is above or below the desired amount within the system. In one example, a sensor measures the temperature difference between sub-cooled liquid and saturated condensing temperature and provides information to the controller. The controller determines a variance between the measured and an expected value. If that variance exceeds a selected threshold, the controller automatically determines that the amount of refrigerant in the system is outside of an acceptable range.

Abstract: A method and apparatus for servicing a pressurized system is described. A purge fitting can be used to vent the pressurized system. Venting can release a gas, such as air, from the system. The pressurized system can be a climate control system (e.g., an air conditioning or refrigeration system), a brake system, a hydraulic system, or a service device for servicing a climate control system. The purge fitting allows air that may be trapped in the pressurized system to be vented by depressing a purge actuator, such as a purge button attached to the fitting. The air can be vented from an opening adjacent to the actuator or other orifice. By purging air directly from the system, the amount of air introduced into the system during servicing can be minimized. The invention also features a coupling member that can be compact in size.

Abstract: A portable device for measuring the refrigerant pressure in an automobile air conditioning system and, if needed, charging the system with additional refrigerant, is provided. An actuator is coupled to a pressurized container that selectively opens the container valve. A hose is provided, the first end of which is connected to the actuator, and the second end is coupleable to a service port of an automobile air conditioner. A T-connector with a check valve is disposed in the hose, and a pressure gauge is connected to the T-connector. When the second end of the hose is coupled to a service port and the actuator is not activated, the pressure gauge measures a pressure of the air conditioner. When the second end is coupled to a service port and the actuator is activated, refrigerant is released from the pressurized container and into the air conditioner.

Abstract: Each blow-off valve includes a valve body with a first movable wall defining a portion of the liquid fluid passage therein and a second movable wall defining a portion of the suction fluid passage therein. An actuator interconnects the movable walls for simultaneously moving the walls and opening the fluid passages in response to the electrical leakage-warning signal. In the species of FIGS. 2 and 3, the movable walls are integrally united with the valve body and include frangible sections that are fractured by an explosive squib to separate the movable walls from the body to simultaneously open the liquid and suction fluid passages. In the species of FIG. 5, the movable walls are separate valve elements disposed in a circular bore that opens the passages to the ambient surroundings. The actuator includes a spring, for biasing each of the valve elements out of its respective bore, and a holding device that weakens in response to the electrical leakage-warning signal.

Abstract: A vessel for containing a refrigerant fluid in a vapor compression system. The vessel includes a housing defining a fixed interior volume and an internal structure subdividing the interior volume into a storage chamber and a displacement chamber. The storage chamber is in fluid communication with the vapor compression system and stores both liquid phase and gas phase refrigerant during normal operation of the system. The displacement chamber may be repositionable or have a variable volume wherein varying the volume of the displacement chamber inversely varies the volume of the storage chamber. The volume of the displacement chamber may be controlled by the transfer of thermal energy to a working fluid within the displacement chamber to thereby thermally expand or contract the working fluid.

Abstract: A system for monitoring the amount of refrigerant supplied from a refrigerant tank to a plurality of refrigerant systems comprising a tank valve for connection to a refrigerant tank at a predetermined location. A rack of refrigerant rack lines is routed from the location to the refrigerant systems for connecting the tank valve and refrigerant to the refrigerant systems. Rack valves are disposed in the refrigerant rack lines for controlling the flow of refrigerant through the rack lines to a selected refrigerant system. A sensor for determining the amount of refrigerant supplied from the refrigerant tank to a refrigerant system and recording the supplied amount of refrigerant. The system controller controls the rack valves and tank valve to selectively connect the supply of refrigerant in the refrigerating tank with a selected refrigerant system so that the amount of refrigerant delivered to the refrigerant system is recorded by the system controller.

Abstract: A purge system operable to remove lubricant from a liquid refrigerant material removed from an evaporator of a mechanical refrigeration system. The contaminated liquid refrigerant is delivered to the purge system by gravity and the separated lubricant is returned to the compressor sump by force from a pressurized fluid. Refrigerant vapor is separated from the contaminated liquid refrigerant by heating and returned to the evaporator of the mechanical refrigeration system.

Abstract: Carbon dioxide refrigerant is circulated through a vapor compression system including a compressor, a gas cooler, an expansion device, and an evaporator. Carbon dioxide is extracted from a vehicle exhaust stream that includes combustion products of burned hydrocarbon fuel. The extracted carbon dioxide is used to supplement the initial supply of carbon dioxide refrigerant to maintain a desired (or predetermined) level of refrigerant in the system. The system includes a sensor assembly that measures and monitors the amount of refrigerant in the system. In one example, the extracted carbon dioxide is automatically added to the system from a storage tank when a sensor detects that the amount of carbon dioxide refrigerant in the system is below a threshold value. In another example, the extracted carbon dioxide is directly added to the system, and the carbon dioxide refrigerant is purged from the system when a sensor detects that the amount of carbon dioxide in the system exceeds a threshold value.

Abstract: A vapor compression system includes a first compression mechanism that compresses the working fluid from a low suction pressure to an intermediate pressure, a second compression mechanism that compresses intermediate pressure working fluid to a higher discharge pressure, and a fluid circuit circulating the working fluid discharged from the second compression mechanism to the first compression mechanism. The fluid circuit includes, in serial order, a first high pressure heat exchanger, an expansion device and an evaporator. The system may be operated as a transcritical system employing carbon dioxide as the working fluid. An intermediate pressure vessel is in communication with the system between the first and second compression mechanisms and working fluid at an intermediate pressure is communicated with the vessel. The system may be regulated by controlling the mass of working fluid contained in the intermediate pressure vessel, e.g., by regulating the temperature or storage volume of the vessel.

Abstract: A method of operating a directed relief valve (28) for an air conditioning system (10) preferably for a vehicle. The air conditioning system (10) includes a compressor (12), a condenser (16), an expansion device (20), and an evaporator connected to one another by refrigerant lines. The system (10) also includes the directed relief valve (28), which is disposed inline with at least one of the refrigerant lines to ventilate the refrigerant. The directed relief valve (28) includes a detonable squib (36) that explodes in response to a ventilation signal. A controller (40) generates the ventilation signal in response to a refrigerant leak being detected by a sensor (38). The sensor (38) is preferably located within an air space (27) and adjacent to the evaporator (22). If there is a malfunction of one of a plurality of sensors (38), a partial malfunction message is sent to the operator.

Abstract: Each blow-off valve includes a valve body with a first movable wall defining a portion of the liquid fluid passage therein and a second movable wall defining a portion of the suction fluid passage therein. An actuator interconnects the movable walls for simultaneously moving the walls and opening the fluid passages in response to the electrical leakage-warning signal. In the species of FIGS. 2 and 3, the movable walls are integrally united with the valve body and include frangible sections that are fractured by an explosive squib to separate the movable walls from the body to simultaneously open the liquid and suction fluid passages. In the species of FIG. 5, the movable walls are separate valve elements disposed in a circular bore that opens the passages to the ambient surroundings. The actuator includes a spring, for biasing each of the valve elements out of its respective bore, and a holding device that weakens in response to the electrical leakage-warning signal.

Abstract: An infrared camera is used to detect leakages in a heat exchanger by an imaging process that indicates temperature differences between a heat exchanger and a pressurized gas therein. The temperature differences are created by cooling or heating either the pressurized gas or the heat exchanger, and any leakages are visually observable by the resultant image which is representative of the temperature differences. The process can be accomplished with the use of ambient air rather than the commonly used trace gases which are less desirable because of economical and environmental reasons.

Abstract: A refrigerant refill amount calculating apparatus is provided with concentration measuring units for measuring component ratios X1:Y1:Z1 of fluorocarbon S contained in a refrigerating machine, and a calculation processing unit. The calculating unit calculates additional filling amounts of respective refrigerant components which are required to fill fluorocarbon having a defined amount “A” in accordance with defined component ratios X:Y:Z within the refrigerating machine 2 based upon an additional filling amount Xa of a refrigerant component which has been additionally filled into the refrigerating machine, and a change amount of component ratios X1:Y1:Z1, X2:Y2:Z2 which have been measured before and after the refrigerant component was filled. Refill amounts of refrigerant components can be easily calculated in a correct manner.

Abstract: This invention makes it possible to charge a refrigeration apparatus with the amount of refrigerant that the refrigeration apparatus requires at the time of onsite installation. As a result, the optimum refrigerant charging amount can always be obtained. The refrigeration apparatus is provided with a refrigeration cycle in which an outdoor unit equipped with a compressor, a condenser, and a receiver is connected to an indoor unit equipped with an expansion valve and an evaporator via a liquid pipe and a gas pipe. The refrigeration cycle is charged with refrigerant while a refrigerant charging operation state is created in which the liquid pipe that connects the outdoor unit to the indoor unit is filled with liquid refrigerant having a prescribed density. Refrigerant charging ends when, during the refrigerant charging operation, it is detected that the level of the liquid inside the receiver has reached a prescribed level.

Abstract: A refrigerant handling system includes coupling apparatus for coupling a refrigerant processing apparatus to an automotive air-conditioning system. The coupling apparatus includes a ball valve including a common port and at least two selectable ports, and a valve member manually movable among a closed condition, wherein the common port is connected to neither selectable port, and three open conditions wherein the common port is connected, respectively, to each of the selectable ports and both of the selectable ports. The common port of the valve is connected to the refrigerant processing apparatus, while the selectable ports are connected, respectively, to conduits for providing connections to the high-pressure and low-pressure sides of the air-conditioning system.

Abstract: A first solenoid-operated, discharge-line control valve (26) is moved between open and closed positions to control fluid flow in the discharge fluid line (18) between the compressor (12) and the condenser (14). A second solenoid-operated, liquid-line control valve (28) is moved between open and closed positions to control fluid flow in the liquid fluid line (20) between the condenser (14) and the evaporator (16). A controller (36) closes one of the flow control valves (26, 28) a period of time before closing the other flow control valve (26, 28) and shuts down the compressor (12) sequentially with the flow control valves (26, 28).

Abstract: A refrigerant management system provides for optimal compressor performance by providing a compressor motor designed to operate at peak efficiency under a first cooling load and at least one sensor for generating a signal that indicates the actual cooling load. A controller is provided that determines any difference between the first cooling load and the actual cooling load from the sensor signal data. The controller is coupled to a refrigerant storage device to either add or remove refrigerant to maintain the system at or near the first cooling load in accordance with the signal form the first sensor indicating the actual cooling load. Consequently, the present invention provides for automatic adjustment of the amount of refrigerant in a cooling loop system to maintain a predetermined cooling load that allows operate a compressor motor to operate at its peak efficiency.

Abstract: The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refrigerant pumped to the compressor which, in turn, assists to cool the compressor head. The flashing of liquid refrigerant to vapor also deters liquid transfer into the compressor enhancing performance thereof. The vapor passages within the discriminator, cylinder head and/or manifold are sized for receipt of spring actuated ball's to open and/or close the vapor passages during suction and/or discharge of refrigerant vapor or liquid by the compressor.

Abstract: Each blow-off valve includes a valve body with a first movable wall defining a portion of the liquid fluid passage therein and a second movable wall defining a portion of the suction fluid passage therein. An actuator interconnects the movable walls for simultaneously moving the walls and opening the fluid passages in response to the electrical leakage-warning signal. In the species of FIGS. 2 and 3, the movable walls are integrally united with the valve body and include frangible sections that are fractured by an explosive squib to separate the movable walls from the body to simultaneously open the liquid and suction fluid passages. In the species of FIG. 5, the movable walls are separate valve elements disposed in a circular bore that opens the passages to the ambient surroundings. The actuator includes a spring, for biasing each of the valve elements out of its respective bore, and a holding device that weakens in response to the electrical leakage-warning signal.

Abstract: The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refrigerant pumped to the compressor which, in turn, assists to cool the compressor head. The flashing of liquid refrigerant to vapor also deters liquid transfer into the compressor enhancing performance thereof. The vapor passages within the discriminator, cylinder head and/or manifold are sized for receipt of spring actuated ball's to open and/or close the vapor passages during suction and/or discharge of refrigerant vapor or liquid by the compressor.

Abstract: There are provided a high-yield economical, refrigerant processing apparatus for collected equipment which can recover and regenerate a liquid refrigerant by highly efficient thermal conversion and charge collected equipment with the liquid refrigerant, without releasing the refrigerant into the air, and an oil separator for use with the refrigerant processing apparatus. In the oil separator, an oil is separated from an oil-containing refrigerant to be recovered, and in a condenser, a gaseous refrigerant is converted into a liquid refrigerant. The oil separator has a heat exchanging double spiral pipe in which a double pipe made of a central pipe and an external pipe is formed spirally about a vertical central axis of the oil separator, and a heating unit for vaporizing the liquid refrigerant.

Abstract: With the intention of reducing power consumption and noise, there is provided a binary refrigeration unit which can be started even by a compressor equipped with a small-torque and compact motor. The binary refrigeration unit is constructed in such a manner that an evaporator 4 of a high-temperature side refrigerant circuit H and a condenser 12 of a low-temperature side refrigerant circuit L are disposed side by side, a refrigerant of the low-temperature side refrigerant circuit L is cooled to be condensed at the condenser 12 by vaporization heat of a refrigerant of the high-temperature side refrigerant circuit H evaporated by the evaporator 4, the condensed refrigerant of the low-temperature side refrigerant circuit L is evaporated at an evaporator 14, and accordingly a low temperature much lower than a low temperature obtained by the evaporator 4 is obtained by the evaporator 14.

Abstract: An aqua-ammonia absorption cooling and/or heating system actively controls the flow of weak liquor from the generator to the absorber, using one or more valves operated in response to weak liquor temperature, and/or pressure and/or concentration.

Abstract: An air conditioning system includes an outdoor unit and multiple indoor units. Each of the indoor units has its own coil assembly and fan and is dedicated to heating a particular area within a building, for example. Not all of the indoor units operate at the same time. Managing the refrigerant charge level within the active part of the system includes controlling an amount of refrigerant flow through the inactive indoor units. When the active part of the system does not have an adequate charge, an increased return flow from the inactive indoor units to the outdoor unit serves to increase the charge. Under circumstances where there is an overcharge in the active part of the system, the inactive indoor units are effectively used as storage for excess refrigerant on a temporary basis.

Abstract: A refrigerant refill amount calculating apparatus is provided with concentration measuring units for measuring component ratios X1:Y1:Z1 of fluorocarbon S contained in a refrigerating machine, and a calculation processing unit. The calculating unit calculates additional filling amounts of respective refrigerant components which are required to fill fluorocarbon having a defined amount “A” in accordance with defined component ratios X:Y:Z within the refrigerating machine 2 based upon an additional filling amount Xa of a refrigerant component which has been additionally filled into the refrigerating machine, and a change amount of component ratios X1:Y1:Z1, X2:Y2:Z2 which have been measured before and after the refrigerant component was filled. Refill amounts of refrigerant components can be easily calculated in a correct manner.

Abstract: An apparatus and method for recovering and recycling a coolant gas from a heat exchanger. The apparatus comprises a coolant gas recovery section, and analysis section, and a coolant gas blending section. The coolant gas recovery section recovers a coolant gas containing contaminants from the heat exchanger. The analysis section monitors a condition of an analysis portion of the recovered coolant gas. The coolant gas blending section operates to produce, based on the condition of the recovered coolant gas monitored by the analysis section, a blend coolant gas comprising a virgin coolant gas and a reclaimed coolant gas that comprises at least a portion of the recovered coolant gas. The blend coolant gas has a predetermined contaminant concentration and is recycled into the heat exchanger. Thus, the coolant gas is recovered from, and recycled to, the heat exchanger at the predetermined contaminant concentration without using a purification device.

Abstract: An apparatus and method for recovering and recycling a coolant gas from a heat exchanger. The apparatus comprises a coolant gas recovery section, and analysis section, and a coolant gas blending section. The coolant gas recovery section recovers a coolant gas containing contaminants from the heat exchanger. The analysis section monitors a condition of an analysis portion of the recovered coolant gas. The coolant gas blending section operates to produce, based on the condition of the recovered coolant gas monitored by the analysis section, a blend coolant gas comprising a virgin coolant gas and a reclaimed coolant gas that comprises at least a portion of the recovered coolant gas. The blend coolant gas has a predetermined contaminant concentration and is recycled into the heat exchanger. Thus, the coolant gas is recovered from, and recycled to, the heat exchanger at the predetermined contaminant concentration without using a purification device.

Abstract: A vapor compression type refrigeration apparatus is provided, in which refrigerant leakage is detected at an early stage. A temperature difference related to the theoretical heat dissipation of the condenser is compared with the actual temperature difference in heat dissipation (temperature difference between the condensation temperature and the outside-air temperature) of the condenser to determine whether there is a refrigerant leak.

Abstract: A temperature controlled apparatus comprises a reversible solid state device having a first section and a second section; portions of the first and the second sections are disposed in intimate contact. The first section is disposed adjacent to a portion of an external wall surface of a compartment and the second section is disposed adjacent to a portion of an internal wall surface of the compartment. A compartment fan is disposed within the compartment. The reversible solid state device and the compartment fan are coupled to a controller. The controller is configured to modify a compartment air temperature inside the compartment by controlling the reversible solid state device and the compartment fan to flow a compartment air across the second section. The controller is configured to control the reversible solid state device and the compartment fan in at least one temperature operational mode.

Abstract: An inlet port filter plate for attachment between a compressor inlet port and a suction hose assembly. The inlet port filter plate includes a main body and mounting surfaces for attachment between the compressor and the suction hose assembly or between the compressor and the compressor hose block. The main body defines a passage that allows for refrigerant flow through a filter which is positioned in the passage. The filter is adapted to stop debris in the refrigerant flow.

Abstract: An air conditioning system includes an outdoor unit and multiple indoor units. Each of the indoor units has its own coil assembly and fan and is dedicated to heating a particular area within a building, for example. Not all of the indoor units operate at the same time. Managing the refrigerant charge level within the active part of the system includes controlling an amount of refrigerant flow through the inactive indoor units. When the active part of the system does not have an adequate charge, an increased return flow from the inactive indoor units to the outdoor unit serves to increase the charge. Under circumstances where there is an overcharge in the active part of the system, the inactive indoor units are effectively used as storage for excess refrigerant on a temporary basis.

Abstract: A purge system operable to remove lubricant from a liquid refrigerant material removed from an evaporator of a mechanical refrigeration system. The contaminated liquid refrigerant is delivered to the purge system by gravity and the separated lubricant is returned to the compressor sump by force from a pressurized fluid. Refrigerant vapor is separated from the contaminated liquid refrigerant by heating and returned to the evaporator of the mechanical refrigeration system.

Abstract: Disclosed is a refrigeration cycle and a method for determining a capacity of a receiver of a refrigeration cycle. According to the present invention, the capacity of the receiver can be determined according to the variations of the paths of the condenser, which provides an ability of fully coping with the variations of the cooling load. When the method for determining the capacity of the receiver according to the present invention is applied in the condenser integrated with the receiver, it is possible that an optimal capacity where no brazing failure occurs is obtained, which means the optimal capacity for the receiver can be easily determined.

Abstract: There are provided a high-yield economical, refrigerant processing apparatus for collected equipment which can recover and regenerate a liquid refrigerant by highly efficient thermal conversion and charge collected equipment with the liquid refrigerant, without releasing the refrigerant into the air, and an oil separator for use with the refrigerant processing apparatus. In the oil separator, an oil is separated from an oil-containing refrigerant to be recovered, and in a condenser, a gaseous refrigerant is converted into a liquid refrigerant. The oil separator has a heat exchanging double spiral pipe in which a double pipe made of a central pipe and an external pipe is formed spirally about a vertical central axis of the oil separator, and a heating unit for vaporizing the liquid refrigerant.

Abstract: An aqua-ammonia absorption cooling and/or heating system actively controls the flow of weak liquor from the generator to the absorber, using one or more valves operated in response to weak liquor temperature, and/or pressure and/or concentration.

Abstract: The present invention relates to a self-governing device for a pulse feeding method of a refrigerant in refrigeration systems. Due to the difference in the refrigerant's pressure and the temperature of the refrigerant vapor in the suction line the piston is moving as a shuttle to provide a self-dosing, pulse feeding supply of the refrigerant. The self-governing device with the pulse feeding method enables the system to regulate a gas defrost process of the evaporator and increases the efficiency of the heat exchange process.

Abstract: This invention makes it possible to charge a refrigeration apparatus with the amount of refrigerant that the refrigeration apparatus requires at the time of onsite installation. As a result, the optimum refrigerant charging amount can always be obtained. The refrigeration apparatus is provided with a refrigeration cycle (A) in which an outdoor unit (X) equipped with a compressor (1), a condenser (2), and a receiver (3) and an indoor unit (Y) equipped with an expansion valve (4) and an evaporator (5) are connected together by a liquid pipe (8) and a gas pipe (9). The refrigeration cycle (A) is charged with refrigerant while a refrigerant charging operation state is created in which the liquid pipe (8) connecting the outdoor unit (X) to the indoor unit (Y) is filled with liquid refrigerant having a prescribed density.

Abstract: A heating, ventilating and air conditioning worker's servicing cart consisting of a base platform to which is mounted an axle holding two anterior wheels, two posterior platform legs, two pairs of upper platform uprights to the posterior pair of which and the platform legs there are attached handlebars with a top platform attached to the platform uprights and legs with cross braces to which recovery and refrigerant tank strapping is attached with pressurized tank strapping attached to the posterior pair and with brazen rod quivers attached to the posterior platform legs and with a recovery tank stabilizing ring affixed to the base platform as well as a recovery tank stabilizing plate and vacuum pump holding bracket both being affixed to the anterior pair of top platform uprights along with recovery tank support strapping with the plate being affixed below the holding bracket.

Abstract: A microprocessor controlled system performs low pressure side pumpdown with the assistance of a service technician. When the refrigerant in the system is transferred to the high pressure side, the low pressure side is available for servicing by the technician.

Abstract: A refrigerant charging/pressure testing hose assembly meeting SAE standard J2196 is useable to both (1) check the pressure in a refrigerant circuit and, (2) if necessary, add refrigerant to the circuit. The assembly includes a length of refrigerant charging, hose having a quick disconnect coupler disposed at one end and connectable to a service fitting portion of the circuit, a piercing-type shutoff valve disposed at the other hose end and connectable to a refrigerant charging canister, a pressure gauge installed in a longitudinally intermediate portion of the hose, and a check valve installed in the hose between the shutoff valve and the pressure gauge and permitting flow through the hose only toward the quick coupler.

Abstract: A refrigerant recovery system that includes an accumulator, a storage tank and an integrated two-phase distillation and filtration path interposing the accumulator and the storage tank. The accumulator may be couplable to a system under repair to receive contaminated refrigerant therefrom. The storage tank may be adapted to receive and store processed refrigerant. The integrated two-phase distillation and filtration path may have a vapor filter, a compressor, a radiator and a liquid filter.