Abstract: An absorption heat pump including a generator or desorber which generates vapour from a first fluid fed to a first condenser, an evaporator provided downstream of the condenser, an outlet of the evaporator connected by a third line to an inlet of a mixer of a low pressure absorber connected to a suction side of a pump feeding solution to the generator. The generator having a poor solution outlet connected by a sixth line provided with at least one lamination valve to a poor solution inlet feeding the absorber. The second line is brought into heat exchange contact with the low pressure absorber and opens into a liquid/vapour separator feeding the evaporator via a third line, the vapour outlet of the separator opening into an intermediate pressure absorber unit.

Abstract: An absorption chiller system is provided. The system includes an evaporator, an absorber, a divider, a recirculating loop, and a primary heater. The evaporator includes a first working fluid inlet and a first working fluid outlet. The absorber includes a second working fluid inlet and a second working fluid outlet. The divider has opposing first and second sides, wherein the first side is in fluid communication with the evaporator and the second side is in fluid communication with the absorber. The recirculating loop connects the first working fluid outlet back to the evaporator, and the primary heater is disposed in thermal communication with the recirculating loop.

Abstract: The invention is directed toward a vapor-liquid heat and/or mass exchange device that can be used in an integrated heat and/or mass transfer system. To achieve high heat and mass transfer rates, optimal temperature profiles, size reduction and performance increases, appropriately sized flow passages with microscale features, and countercurrent flow configurations between working fluid solution, vapor stream, and/or the coupling fluid in one or more functional sections of the desorber are implemented. In one exemplary embodiment of the present invention, a desorber section utilizes a heating fluid flowing in a generally upward direction and a concentrated solution flowing in a generally downward direction with gravity countercurrent to the rising desorbed vapor stream. To further increase the efficiency of the system, various types of column configurations can be used. Additionally, the surfaces of the microchannels can be altered to better transfer heat.

Abstract: Methods and apparatus for separating fluids are disclosed. We have discovered that, surprisingly, providing an open pore structure between a wick and an open flow channel resulted in superior separation performance. A novel and compact integrated device components for conducting separations are also described.

Abstract: A thermally driven heat pump includes a low temperature evaporator for evaporating cooling fluid to remove heat A first heat exchanger located at an outlet of a converging/diverging chamber of a first ejector receives a flow of primary fluid vapor and cooling fluid vapor ejected from the first ejector for condensing a portion of the cooling fluid vapor An absorber located in the first heat exchanger absorbs cooling fluid vapor into an absorbing fluid to reduce the pressure in the first heat exchanger A second heat exchanger located at an outlet of a converging/diverging chamber of a second ejector receives primary fluid vapor and cooling fluid vapor ejected from the second ejector for condensing the cooling fluid vapor and the primary fluid vapor A separator in communication with the second ejector, the low temperature evaporator and the primary fluid evaporator separates the primary fluid from the cooling fluid.

Abstract: In certain embodiments, removing non-condensable gas from a cooling system includes trapping contents of a discharge tube of a heat exchanger, where the heat exchanger is in thermal communication with an ambient environment at an ambient temperature. The contents of the discharge tube comprises a vapor portion of a cooling fluid, a liquid portion of the cooling fluid, and a non-condensable gas. The cooling fluid is at a subambient pressure, and the ambient temperature is lower than a boiling point of the cooling fluid. A first additional portion of the cooling fluid is inlet into the discharge tube to increase a pressure within the discharge tube. The vapor portion of the cooling fluid within the discharge tube is allowed to condense. A second additional portion of the cooling fluid is inlet to purge the non-condensable gas from the discharge tube.

Abstract: Absorbers for a lithium bromide absorption machine are described. These systems may include a storage tank; a plurality of sprinklers, situated inside the storage tank, and adapted to receive a hot and concentrated lithium bromide solution, and to project the hot and concentrated solution inside the storage tank where the hot and concentrated solution is diluted to produced a diluted solution; a feed pump adapted to export the diluted solution from the absorber; a heat exchanger, positioned outside the storage tank and configured to cool the diluted solution; and a recirculation pump, configured to cause the diluted solution to be communicated from the storage tank to the heat exchanger, and to be returned from the heat exchanger to the plurality of sprinklers in a continuous recirculation process.

Abstract: An absorption heat pump, including: an evaporator which takes in a first heat source and evaporates refrigerant liquid into refrigerant vapor; an absorber which has a heat receiving medium passage and which takes in heat receiving medium liquid through a heat receiving medium inlet of the heat receiving medium passage, heats the heat receiving medium liquid with the heat of absorption generated when the refrigerant vapor generated in the evaporator is absorbed into solution, and discharges the heat receiving medium in the form of vapor or mixture of vapor and liquid through a heat receiving medium outlet of the heat receiving medium passage; a generator which takes in a second heat source and evaporates the refrigerant from the solution having absorbed the refrigerant vapor; and a condenser which takes in a cooling source and the refrigerant vapor generated in the generator to condense the refrigerant vapor.

Abstract: A cooling element with a sorption agent, that under vacuum can sorb a vapour -like working agent that evaporates from a liquid working agent in an evaporator and with a regulator organ in a working agent vapour channel between the sorption agent and the evaporator, wherein the entire cooling element is hermetically enclosed by a gas-tight multi-layer film, the multi-layer film has a flexible construction and is under vacuum so encloses the regulator organ, the working agent vapour channel and the evaporator, that the evaporator and the working agent vapour channel remain flexible and the working agent vapour can flow to the sorption agent only through the regulator organ.

Abstract: The present invention provides a solid polymer electrolyte fuel cell comprising a fuel cell stack 21 formed by laminating a plurality of fuel cell units each of which includes a fuel electrode 23, an oxidant electrode 24, and a solid polymer electrolyte membrane 22 interposed between the fuel and oxidant electrodes. The fuel cell unit is operable to generate an electric power through an electrochemical reaction between a first gas supplied to the side of the fuel electrode 23 and a second gas supplied to the side of the oxidant electrode 24. In this fuel cell, the first gas supplied to the side of the fuel electrode 23 and the second gas supplied to the side of the oxidant electrode 24 are adapted to flow generally in opposite directions in the fuel cell stack 21, so that a water created on the side of oxidant electrode 24 is reciprocally moved between the fuel electrode 23 and the oxidant electrode 24 to increase a water holding region in the solid polymer electrolyte membrane 22.

Abstract: Apparatus and process for distilling a fluid mixture using low temperature glide heat are disclosed. A substantial portion of the glide heat is at a temperature lower than the peak distillation temperature. The disclosure achieves a maximal amount of distillative effect from a given heat source. Applications include absorption refrigeration and absorption power cycles. Referring to FIG. 1, column 104 and desorber 105 distill fluid in conduit 101 using low temperature glide heat. Divider 108 proportions fluid between them.

Abstract: A filter system for an absorption chiller includes a replaceable filter element, a plateable member, and a sacrificial member. The filter receives a weak solution from the chiller's evaporator, receives a stronger solution from the chiller's absorber, and discharges a mixture of the solutions to the chiller's generator. Conveying the weak solution to the filter system avoids creating an accumulation of lithium bromide in the evaporator and helps dissolve or flush inhibitors from the filter element on a continuous basis. Combining the weak and stronger solutions in the filter system attempts to confine a corrosion or copper oxide plating process to an area of the chiller that can be readily serviced. The plateable member and the sacrificial member provide replaceable or consumable members used in the corrosion or plating process.

Abstract: An absorption system powered by low temperature heat for producing at least one of refrigeration and power is disclosed, wherein a low-pressure drop heat reclaimer 1 reclaims heat from the source into a heating agent, which in turn supplies heat to the absorption cycle desorber 5 via internal coils 7. The extra temperature differential normally present in closed cycle heating systems is avoided by using the absorption working fluid as the heating agent, in an integrated system.

Abstract: An absorption apparatus for an absorption chiller includes a series of eliminator blades situated between a vaporizing chamber (e.g., a generator or an evaporator) and a devaporizing chamber (e.g., a condenser or an absorber). Each of the blades includes an upstream leg, a downstream leg and a deflection tab. With respect to the direction of vapor flowing from the vaporizing chamber to the devaporizing chamber, the upstream leg is at an upward incline and the downstream leg is at a downward incline. The deflection tab extends out over the downstream leg to create a concavity that helps prevent liquid in the devaporizing chamber from splashing back across the eliminator blade. In some embodiments, a tube support plate includes a series of holes for not only supporting the tube bundles of two heat exchangers but also for supporting the eliminator blades.

Abstract: An absorption refrigerator is minimized in the size and the weight. A sensible heat exchanger 14 and a cooling fan 19 for cooling the sensible heat exchanger 14 are mounted front and rear opposite to each other to form a cooling unit. At one side of the fan 19, a regenerator 3 and a rectifier 6 are aligned vertically one over the other. At the other side of the fan 19, an evaporator 1 and an absorber 2 of a rectangular configuration are provided side by side. A condenser 9 is laid above the cooling unit. The cooling unit, the evaporator 1, the absorber 2, the condenser 9, the regenerator 3, the rectifier 6, and a set of pumps P1 to P4 all are installed in a main housing 20 of substantially a rectangular parallelopiped shape having a depth reduced axially of the cooling fan 19.

Abstract: In a rectifying apparatus of vapor/liquid contact type, the rectifier 5 is disposed above a regenerator 4 and has two stages, a lower recovery stage and an upper condensation stage. The two stages are filled with filler elements 7a, 7b and 7c, 7d, respectively. Each filler elements 7a and 7c has a conical bottom for biasing the falling liquid towards its center and the rising refrigerant vapor towards its outer edge. The rising speed of the refrigerant vapor is made more uniform and the falling liquid has less tendency to drip down along the side wall. As the contact between the vapor and the liquid is increased, the efficiency of rectification is enhanced.

Abstract: A refrigerant recovery system for use in connection with a refrigeration system having an evaporator, a compressor, and a condenser, and a purge unit connected to the condenser for receiving gaseous refrigerant and non-condensable gases from the condenser. A tank connects to the purge unit by a line for receiving purged gaseous refrigerant and purged non-condensable gases from the purge unit. The tank contains adsorbent material for recovering the purged gaseous refrigerant from the purged non-condensable gases. The system includes means for determining when a predetermined amount of purged gaseous refrigerant is received by the tank and means for controlling the flow of fluids to and from the tank.

Abstract: An ammonia GAX absorption cycle comprising a first pipe allowing a strong solution generated in an absorber to pass through a rectifier to rectify a coolant vapor provided from a generator the rectifier into a highly concentrated coolant vapor, a second pipe allowing the strong solution flowing in the first pipe and heated in the rectifier flow into a GAX-absorber/generator to undergo heat exchange with a weak solution provided from the generator into the absorber, a third pipe allowing the strong solution enter a solution cooling absorber to undergo heat exchange with the weak solution cooled in the GAX-absorber/generator, and a coolant introducer allowing the strong solution flowing in the second and third pipes and heated by heat exchange to flow into the generator and undergo heat exchange with the coolant vapor and weak solution produced in the generator.

Abstract: An absorption-type air-conditioning apparatus includes an overflow pipe connecting a phase separator and an absorption chamber. When the apparatus begins operation, and the pressure differential between the phase separator and the evaporation chamber is insufficient to cause the absorption liquid to flow smoothly via dispenser nozzles into the absorption chamber, excessive accumulation of absorption liquid in the phase separator is prevented by allowing the excess liquid to bypass the nozzles via the overflow pipe. When the temperature of the absorption liquid in the phase separator increases so that the pressure differential between the phase separator and the absorption chamber is increased, the overflow pipe is closed, and normal operation of the apparatus proceeds.

Abstract: An absorption cooling system generator with an internal fire tube or combustion chamber is disclosed. The fire tube includes at least one radially projecting heat transfer member on its interior surface that interacts with hot combustion gases. A minimum quantity of refrigerant solution is maintained in the generator by a leveling chamber. The leveling chamber is a refrigerant solution reservoir connected to the generator to maintain substantial equilibrium of the fluid levels within the generator and reservoir. The leveling chamber includes a standpipe. When the refrigerant solution level is above the standpipe, solution may flow out of the leveling chamber and the generator to an absorber. If the solution level falls below the standpipe, set at a predetermined level, solution will not flow out of the generator. Thus, the generator will maintain a minimum, predetermined solution level. In addition, a baffle coil tube and a helical baffle provide an improved solution flow in the generator.

Abstract: An AAATHP is designed to make the non-evaporated liquid refrigerant stemming from the evaporator according to the operational condition of the AAATHP to rectify the refrigerant vapor to be sent to the rectifier from the regenerator, thus improving the efficiency of the rectifier and safely maintaining the operational system of the AAATHP. The AAATHP comprises the following parts: An automatic switch valve to send liquid refrigerant accumulated at the bottom of the evaporator. The heat exchanging pipe enables the liquid refrigerant formed by the evaporator to flow in the rectifier so as to enable the liquid refrigerant sent out by the automatic switch valve to exchange its heat with the refrigerant vapor coming to the rectifier from the regenerator. A first liquid refrigerant passage pipe formed between the automatic switch valve and the heat exchanging pipe sends the liquid refrigerant accumulated at the bottom of the evaporator to the heat exchanging pipe.

Abstract: An absorption refrigeration system generator is disclosed which has an internal fire tube or combustion chamber for heating a composite fluid refrigerant. The fire tube includes at least one radially projecting heat transfer member on its interior surface for interaction with hot combustion gases. The generator is connected to a leveling chamber for maintaining a minimum quantity of fluid refrigerant in the generator. The leveling chamber comprises a reservoir connected to facilitate substantial equilibrium of the fluid levels within the generator and reservoir. The reservoir holds a quantity of weakened refrigerant solution flowing from the generator. A conduit within the reservoir transfers the weakened solution within the reservoir to the absorber under normal operating conditions. In the event the refrigerant level within the generator drops below a predetermined level, fluid flow out of the reservoir ceases.

Abstract: An absorption heating and cooling system is shown in which an absorbent/refrigerant fluid is circulated in a fluid flow loop having a condenser, a metering device, an evaporator, an absorber and a generator chamber. A magnetron provides a heat source for the generator chamber which also contains electrodes to facilitate vaporization of the refrigerant. The vaporized refrigerant and entrained moisture passes from the generator chamber to an electromagnetic vapor scrubber to further ionize the fluid. The ionized fluid passes from the scrubber to the condenser and from the condenser through a metering device which reduces the pressure and temperature of the fluid. The refrigerant then passes to an evaporator where it contacts a heat exchange medium which transfers heat to the refrigerant in order to achieve a desired cooling effect. The refrigerant then passes from the evaporator to the absorber and back to the generator chamber to repeat the cycle.

Abstract: In a heat exchange system such as an absorption refrigerator, a heat exchange element is disposed in at least one of a heat exchanger, a condenser, an evaporator, an absorber and a low-temperature regenerator. The heat exchange element has a bellows-fin formed into a wave-like shape by consecutively bending a thin plate, and sealing plate sealingly attached onto ends of the bellows-fin, for defining adjacent two chambers alternately in the heat exchanger or the like. The heating fluid and the fluid to be heated are heat-exchanged to each other through the thin plate of the bellows-fin defining respective chambers, so that contact area is increased to thereby extremely improve the heat exchange efficiency. Further, the heat exchange element can be manufactured with ease, to thereby decrease the production cost.

Abstract: An absorption refrigeration system with ammonia as refrigerant and a salt solution as absorbent operates with an improved margin of safety to crystallization of the salt solution by incorporating an absorber having a precooler and narrow nozzles. The precooler serves to additionally lower the temperature of the salt solution before it is caused to absorb ammonia exothermically, and the nozzles are for injecting the salt solution into ammonia gas flows, while maintaining the solution on the upstream side at relatively high pressure. The flow characteristics of the gas-liquid mixture through absorber tubes change from churn flow to slug flow and finally to bubble flow. A blower is provided for recycling a portion of the ammonia gas back to the absorber for optimizing absorption efficiency. The precooler and the absorber tubes are cooled evaporatively to reduce operating temperatures and system operating costs.

Abstract: Apparatus and process are disclosed for increasing the sorbate content of a sorbent liquid beyond the level possible at a defined absorbing temperature and pressure. Specific useful results obtainable thereby are an increase in the efficiency of thermally actuated absorption processes such as absorption compression and absorption heat pumping. The improvement allows greater temperature overlap between generator and absorber, ambient responsive performance, and virtualy elimination of the need for rectification. Referring to FIG. 1b, the useful result is obtained by pressurizing (1) and splitting (2) the sorbent to supply an absorber (3) with cooling (4) and a generator (5) with heating (6), and routing (7) generator sorbate vapor to the absorber to achieve increased dilution therein.

Abstract: Apparatus and process are disclosed for increasing the efficiency of thermally powered absorption heat pumps which use volatile absorbents. The improvement reduces rectification losses in absorption cycles having at least two generators operating at different pressures. In FIG. 1, the rectifier (7) for the higher pressure generator (1) is refluxed at least in part by exchanging latent heat (9) between rectifier vapor and absorbent solution at the approximate pressure of the lower pressure generator.

Abstract: An air-cooled absorption air-conditioner comprising a high-temperature regenerator for heating diluted solution which has absorbed refrigerant, a separator for separating refrigerant vapor obtained by the high-temperature regenerator from the diluted solution, a condenser for condensing the refrigerant vapor into liquid refrigerant, an evaporator for vaporizing liquid refrigerant, cooling circulation heat medium by the effecting heat exchange between it and the above-mentioned liquid refrigerant vaporized and supplying the circulation heat medium thus cooled to a space to be cooled, an absorber for allowing the refrigerant vapor generated in the evaporator to be absorbed by the solution separated in the separator and removing the heat thereby generated by air-cooling, and a heat-medium-circulation pump for circulating the circulation heat medium, the circulation heat medium being heated using the refrigerant vapor generated in the evaporator and supplied to a space to be heated.

Abstract: A absorption refrigeration system having cooling and heating modes of operation functions with a double-effect or "split" refrigeration cycle having approximately the same refrigerant concentration span in each cycle loop. The system includes a novel direct expansion combined evaporator and absorber assembly with improved heat transfer characteristics and with interchangeable liquid flows accomplished through actuation of a conventional reversing valve. Also, the system is provided with improved recuperative heat exchangers to further increase system energy conversion efficiencies.

Abstract: A rectifier column for a vapor generator means of a heat transfer system having a reflux inlet and modulating means at said inlet responsive to a condition representative of the quality of the vapor being generated so as to control the flow of reflux into the column thereby maintaining optimum vapor generation. In one arrangement the modulating means comprises a temperature sensitive actuator, e.g. a wax filled bellows which is situated in the path of the generated vapor at the output of the column.

Abstract: An air-cooled absorption type water cooling/heating apparatus has a cooling circulation system including an evaporator in which a liquid refrigerant is evaporated so as to cool a heat exchanger leading to a cooling heat radiator, and a heating circulation system including a heat exchanger leading to a heating heat radiator and disposed in a separator in which the solution which has been thinned as a result of absorption of the refrigerant is heated and fractionated into refrigerant vapor and thick solution. In the heating mode of operation, the circulation passages for the solution and refrigerant are closed. This arrangement enables a heat source, which is used for heating the refrigerant and the absorption solution in the cooling mode of operation, to be used also in the heating mode of operation, so that the construction of the apparatus as a whole is made compact.

Abstract: A method of operating an absorption refrigeration system. The system has high- and low-pressure sections. The sections are connected by three lines and have an evaporator for subcooling the liquified refrigerant before it enters a connecting line. To enable uninterrupted transport of the weak refrigerant solution without increasing prime cost, the refrigerant vapor is fed from a subcooler into the expanded weak refrigerant solution at one or more points and a connecting line that conveys the weak refrigerant acts as an absorber. Expanded and evaporating refrigerant fluid flows through a subcooler in the high-pressure section. A condenser is in a line that conveys the weak refrigerant solution. The exit from the subcooler communicates through another line downstream of an expansion valve with a line that conveys the weak refrigerant solution and acts accordingly as an uncooled absorber.

Abstract: An absorption heat pump comprising a generator which is provided with a condensation pipe (59) comprising a lower generating section (79) and an adjoining upper rectifying section (81). The upper section (81) is filled with a thermally insulating gas (87) which separates the generating section (79) from the rectifying section (81). Thus, a simple construction is obtained, in which the rectifier is integrated in the generator.

Abstract: A steam generating and condensing apparatus having a steam generating chamber in which a diluted solution flowing from an absorption device and containing a refrigerant absorbed therein flows outside of the pipes of a steam generating heat exchanger to evaporate the refrigerant from the diluted solution with a hot fluid flowing through the pipes of the steam generating heat exchanger, and a steam condensing chamber in which the refrigerant steam supplied through a partition from the steam generating chamber is condensed by a steam condensing heat exchanger. A double-cylinder assembly is provided composed of outer and inner cylinders, with the inner cylinder being divided by a dispersing end plate into upper and lower chambers serving as a dispersing diluted solution chamber and the steam generating chamber, respectively. The inner and outer cylinders jointly define a space in which the steam condensing chamber is disposed. The partition has eliminators on an upper portion thereof.

Abstract: An absorption refrigeration system having a generator, a rectifier, a condenser, an evaporator, an absorber and heat exchangers which are connected by means of conduits in an airtight manner so that circulations for refrigerant and for absorbent solution are formed, wherein the rectifier is mounted upright above the generator, and wherein a receiver for receiving absorbent containing refrigerant is mounted below the rectifier and communicates with the lower portion of the generator through an absorbent passage means, whereby decreasing hindrance of the generation of the refrigerant vapor from the generator, thus increasing the efficiency in generating vapor and, at the same time, preventing local overheating of the solution in the generator.

Abstract: In an absorption heat pump capable of bivalent operation, to make possible combined operation in addition to the pure heat pump operation and the pure boiler operation, it is proposed to divide the refrigerant stream after the condenser and the stream of weak solution leaving the boiler, with one component stream of the refrigerant being fed through the refrigerant throttle and the vaporizer to a low-pressure absorber, into which a component stream of the weak solution is introduced through the temperature changer and the solvent throttle, while the other component stream of the refrigerant is fed either directly to the boiler or to a high-pressure absorber, to which the other component stream of the weak solution is fed directly in both cases, and to feed the strong solution from the low-pressure absorber through the temperature changer and/or the reflux condenser to the boiler, but on the other hand to feed the solution from the high-pressure absorber directly to the boiler.

Abstract: A method of improving the energy consumption of absorption cooling plants, according to which the solution residue from the evaporator of an absorption cooling plant is employed for the rectification of the vapor of the cooling medium.

Abstract: An absorption refrigeration apparatus provided with a single pipe boiler system having a pump and a standpipe containing a rectifier, and a boiler, with the latter having heat supplied to it. The arrangement permits one to choose a more favorable reaction ratio of the pump in the apparatus, or the absorber vessel can be placed at a lower level, with one choice resulting in a lower consumption of energy, and the other choice a greater cooling effect.

Abstract: An improved heating or cooling system based on absorption principles is disclosed and claimed herein. A closed system is provided with a refrigerant-absorbent solution where separation of the refrigerant-absorbent is accomplished by a semi-permeable membrane. The refrigerant-absorbent solution at its normal concentration is pumped under pressure to a membrane separation unit where the refrigerant is selectively passed through a membrane separator in some proportion while a remaining absorbent enriched refrigerant-absorbent solution is rejected. The membrane separated refrigerant is then circulated through a heat exchange leg of the system for heating and/or cooling of affected areas depending upon the particular treatment of the refrigerant. At the end of the heat exchange leg, the refrigerant is fed to an absorber where it is recombined with the absorbent enriched solution to reconstitute the original refrigerant-absorbent solution which is then recirculated by the pump and the cycle is repeated.

Abstract: An ice cube freezing arrangement in an absorption type refrigerator having conduit means conducting hot vapors from a vapor conduit leading from the boiler system to the ice dividing walls and tray for ice cubes. The vapor conduit is normally blocked but opened occasionally in order to release the ice cubes from the tray. Thus, ice cubes are manufactured with relatively small energy consumption. The control system for ice freezing is completely internal in the refrigerator, which controls the ice making, ice releasing, and the water supply to the ice making device.

Abstract: In a heat activated heat pump apparatus having a generator, condensor, evaporator and absorber, a first coolant pathway through the absorber and condenser and a second coolant pathway through the evaporator. An ambient air heat exchanger and a second heat exchanger in heat exchange relation with the space to be cooled or heated are selectively interconnected with the first and second coolant pathways. In the improvement, rich liquor from the absorber is preheated by heat exchange with a portion of the interior of the absorber, with the weak liquor from the generator and with the refrigerant vapor from the generator.

Abstract: A generator unit of an absorption heat pump includes a housing defining a lower boiler zone, a middle analyzer zone and a rectifier zone extending upwardly and outwardly from above the analyzer zone. A refluxer is located in the distal end of the rectifier zone. A weak liquor conduit extends upwardly from the boiler zone out of communication with, but in heat exchange relation with the analyzer zone.

Abstract: An absorption refrigerator of natural circulation type comprising a first generator connected to the lower end of a gas-liquid lift and a second generator connected to the upper end of the gas-liquid lift. A solution of an absorbing medium, which may be an aqueous solution of a salt of lithium, is heated in the first generator to be lifted through the gas-liquid lift into the second generator, and the lithium salt solution is then concentrated to a predetermined concentration in the second generator.

Abstract: An absorption refrigerator of natural circulation type employing water as a refrigerant and lithium salt as an absorbing medium, in which a U-tube is disposed in a conduit portion between a condenser and an evaporator and is connected at one end thereof to a separator in addition to the condenser and at the other end thereof to a refrigerant reservoir. A cooling conduit extends into this refrigerant reservoir to maintain substantially constant the internal pressure of the reservoir so that the amount of the refrigerant stored in the reservoir can be controlled depending on the pressure difference between the separator side of the U-tube and the reservoir side of the U-tube. Therefore, the concentration of the lithium salt solution circulating through the refrigeration system can be controlled depending on the temperature of a heating medium supplied to a generator.