A liquid absorption refrigeration system and a tube and channel heat exchanger include: an absorber section to contain a saturated strong solution; a pump connected to an outlet of the absorber section to receive saturated strong solution therefrom; a regenerator section connected to an outlet of the pump to receive a flow of pressurized saturated strong solution therefrom; an expansion device connected to an outlet of the regenerator section to receive a flow of subcooled strong solution therefrom; an evaporator section connected to an outlet of the expansion device to receive the subcooled strong solution therefrom, the evaporator section connected to the absorber section to return strong solution thereto; and a condenser section connected to the evaporator section to receive a refrigerant evaporated from the subcooled strong solution in the evaporator, the condenser section connected to the absorber section to return liquid refrigerant thereto.

An evaporator for an absorption heat pump or a single coolant cooling process comprises a number of stacked plates provided with a pressed pattern to hold the plates on a distance from one another to form a heat exchanging strip, vapor leading spaces and outer walls, the heat exchanging strip being designed such that flow channels are formed by internal surfaces of the strip, said flow channels connecting a heat carrier inlet and a heat carrier outlet, wherein a coolant forms a falling film on external surfaces of the heat carrier channels by being provided above the heat carrier channels by a coolant inlet, wherein coolant being vaporized from the external surfaces by heat from a heat carrier flowing from the inlet to the outlet rapidly enters the vapor leading spaces. The vapor leading spaces are provided between the heat exchanging strip and the outer walls.

An evaporator for an absorption heat pump or a single coolant cooling process comprises a number of stacked plates provided with a pressed pattern to hold the plates on a distance from one another to form a heat exchanging strip, vapor leading spaces and outer walls, the heat exchanging strip being designed such that flow channels are formed by internal surfaces of the strip, said flow channels connecting a heat carrier inlet and a heat carrier outlet, wherein a coolant forms a falling film on external surfaces of the heat carrier channels by being provided above the heat carrier channels by a coolant inlet, wherein coolant being vaporized from the external surfaces by heat from a heat carrier flowing from the inlet to the outlet rapidly enters the vapor leading spaces. The vapor leading spaces are provided between the heat exchanging strip and the outer walls.

A liquid desiccant system including a high desorber, a low desorber, and an absorber that are in fluid communication with a working solution, where the high desorber provides rejected water vapor from the working fluid for condensation in a condenser of the low desorber that provides heat for rejection of additional water from the working solution in the low desorber effectively multiplying the heat provided for desorption. The low desorber provided the concentrated working solution to the absorber where water from ambient air is condensed into the concentrated working solution to provide a dilute working solution within a working solution conduit of the absorber that is thermally coupled to an internal cooler of the absorber. In some embodiments, the working solution can be an aqueous solution of at least one ionic liquid.

The present invention provides a heat pump that includes an absorber/evaporator module having a solution channel and a refrigerant channel along with first and second liquid channels. A porous membrane is positioned between the refrigerant channel and the solution channel; the porous membrane permits flow of vapor molecules therethrough while restricting flow of absorbent molecules. A membrane-based generator/condenser module with a similar structure is in fluid communication with the absorber/evaporator module. The membrane-based modules offer a large specific surface area with integrated solution/refrigerant flows, which enables formation of a highly compact heat pump exhibiting strong heat/mass transfer.

The present invention provides a heat pump that includes an absorber/evaporator module having a solution channel and a refrigerant channel along with first and second liquid channels. A porous membrane is positioned between the refrigerant channel and the solution channel; the porous membrane permits flow of vapor molecules therethrough while restricting flow of absorbent molecules. A membrane-based generator/condenser module with a similar structure is in fluid communication with the absorber/evaporator module. The membrane-based modules offer a large specific surface area with integrated solution/refrigerant flows, which enables formation of a highly compact heat pump exhibiting strong heat/mass transfer.

An adsorption refrigerator comprising a first adsorber containing a first adsorbent capable of adsorbing and desorbing a first adsorbent refrigerant, a second adsorber containing a second adsorbent capable of adsorbing and desorbing the first adsorbent refrigerant, a first evaporator capable of evaporating the first adsorbent refrigerant under reduced pressure to cool a first working fluid, a first condenser capable of condensing the first adsorbent refrigerant in gaseous state, a third adsorber containing a third adsorbent capable of adsorbing and desorbing a second adsorbent refrigerant, a fourth adsorber containing a fourth adsorbent capable of adsorbing and desorbing the second adsorbent refrigerant, a second evaporator capable of evaporating the second adsorbent refrigerant under reduced pressure to cool a second working fluid, a second condenser capable of condensing the second adsorbent refrigerant in gaseous state, a first heat exchanger capable of applying heat absorbed from a first heat source to a first heating medium, a second heat exchanger capable of removing and releasing heat from a second heating medium, and a heat recovery path where a third heating medium performs recovery of adsorption heat generated by adsorption-driving of the first adsorber or the second adsorber and performs heat application of regeneration-driving of the third adsorber or the fourth adsorber.

This invention relates to using a eutectic mixture of two ionic liquids, as an absorbent material in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent is a eutectic mixture of two ionic liquids.

An absorption cycle (110) according to the present invention is configured to operate using: a refrigerant having a global warming potential of less than 1000, and including at least one of an HFO-based refrigerant, an HFC-based refrigerant, and an HCFO-based refrigerant; and an absorbing liquid including at least one compound represented by Formulas (1), (2), and (3): R.sup.1(OCH.sub.2CH.sub.2).sub.nOR.sup.2 (1) R.sup.1(OCH.sub.2CH(CH.sub.3)).sub.nOR.sup.2 (2) R.sup.1COO(OCH.sub.2CH.sub.2).sub.nOR.sup.2 (3) where R.sup.1 and R.sup.2 are each independently a hydrogen atom or an alkyl group having a carbon number of 1 or more and 6 or less, and n is an integer of 1 or more and 6 or less.

An absorption cycle (110) according to the present invention is configured to operate using: a refrigerant having a global warming potential of less than 1000, and including at least one of an HFO-based refrigerant, an HFC-based refrigerant, and an HCFO-based refrigerant; and an absorbing liquid including at least one compound represented by Formulas (1), (2), and (3): R.sup.1(OCH.sub.2CH.sub.2).sub.nOR.sup.2 (1) R.sup.1(OCH.sub.2CH(CH.sub.3)).sub.nOR.sup.2 (2) R.sup.1COO(OCH.sub.2CH.sub.2).sub.nOR.sup.2 (3) where R.sup.1 and R.sup.2 are each independently a hydrogen atom or an alkyl group having a carbon number of 1 or more and 6 or less, and n is an integer of 1 or more and 6 or less.