An absorption cycle apparatus including a working fluid is presented. The working fluid includes a metal halide, water and a zwitterion additive, wherein the zwitterion additive includes an amino acid, 2,2′-[(phosphonomethyl)imino]diaceticacid, 3-[(2-hydroxyethyl)amino]-1-propanesulfonic acid, or combinations thereof. A method of controlling crystallization in a working fluid of an absorption cycle apparatus is also presented.

In some embodiments, an air-cooled ammonia refrigeration system comprises: an air-cooled condenser comprising a heat exchanger and at least one axial fan; an evaporator coupled to the air-cooled condenser; a subcooler positioned between the air-cooled condenser and the evaporator; a compressor coupled to the evaporator; an oil cooler coupled to the compressor; a water system coupled to the air-cooled condenser, the water system comprising a water source, a water pump, and a plurality of spray nozzles positioned below the air-cooled condenser; and a control circuit coupled to the air-cooled condenser and the water system, the control circuit configured to pulse atomized water through the plurality of spray nozzles to a surface of the air-cooled condenser when a head pressure of the air-cooled condenser is higher than a predetermined value.

The present invention pertains to systems, methods, and compositions for liquid phase change, including for active cloud point, e.g., critical solution temperature, adjustment and heating or cooling, e.g., refrigeration, cycles. In some embodiments heat is absorbed, released or both due to phase changes in a liquid system. Advantageously, the phase changes may be controlled by controlling the ingredients or amounts of certain components of the liquid system. Advantages may include lower capital expenditures, lower operating expenses, or both for a diverse and wide range of heating and cooling applications. Such applications include, for example, cooling of data centers, cooled transportation of goods, refrigeration, heat pumps, extractions, ocean thermal energy conversion, and de-icing of roads to name just a few.

The invention relates to a method for cyclical operation of a thermoelectric cell arrangement by periodically changing the temperature of the thermoelectric cell arrangement, wherein the thermoelectric cell arrangement is thermally coupled to a cyclically operated absorption heat pump. The following method steps are carried out cyclically: thermally coupling the thermoelectric cell arrangement during a cooling phase to a cold side of the absorption heat pump, thermally coupling the thermoelectric cell arrangement during a heating phase to a hot side of the absorption heat pump. The invention also relates to a harvester device for generating electrical energy by means of a thermoelectric cell arrangement, wherein the thermoelectric cell arrangement is thermally coupled to an absorption heat pump, wherein the thermal coupling makes it possible to effect, in time with the working cycle of the absorption heat pump, a temperature change in the thermoelectric cell arrangement.

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.

This invention relates to using a guanidinium-based ionic liquid 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 guanidinium-based ionic liquid. A preferred refrigerant is water. This invention also provides a method for synthesizing N,N,N′,N′,N″,N″-hexamethylguanidinium acetate.

A diffusion absorption refrigeration apparatus includes a bubble pump; a gas-liquid separator; a condenser; a gas branch pipe; an evaporator; an absorber; a gas heat exchanger; a storage tank; and a solution heat exchanger, in which a single material of trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and 2,3,3,3-tetrafluoropropene (R-1234yf), which have a low global warming potential (GWP), or a mixture thereof at a predetermined ratio is used as a refrigerant. Accordingly, the stability is high and a low GWP can be achieved.

An electrochemical heat transfer device utilizes an electrochemical hydrogen compressor to pump hydrogen into and out of a reservoir having a metal hydride forming alloy therein. The absorption of hydrogen by the metal hydride forming alloy is exothermic, produces heat, and the desorption of the hydrogen from the metal hydride forming alloy is endothermic and draws heat in. An electrochemical hydrogen compressor may be configured between to reservoirs and pump hydrogen back and forth to form a heat transfer device. A heat exchange device may be coupled with the reservoir or may comprise the outer surface of the reservoir to transfer heat to an object or to the surroundings. A closed loop may be configured having two reservoirs and one or two electrochemical hydrogen compressors to pump the hydrogen in a loop around the system.

A climate-control system can be used to heat or cool a space. The climate-control system may include first and second vessels between which refrigerant and co-fluid may be circulated. The refrigerant may be absorbed into the co-fluid within the first vessel at a first rate. The refrigerant may desorb from the co-fluid within the second vessel at a second rate. Ultrasonic energy may be used to adjust the second rate to substantially match the first rate.

Disclosed is a refrigeration system, including: a generator having a liquid storage cavity for containing a liquid ammonia and sodium nitrate solution, a heat source being connected to the generator and an exhaust pipe being arranged at the upper end of the generator; a condenser having a condensation cavity, an inlet of the condensation cavity being communicated with the exhaust pipe; an evaporator having an evaporation cavity for containing hydrogen, an inlet of the evaporation cavity being communicated with an outlet of the condensation cavity through a liquid inlet pipe; an absorber located below the evaporation and having an absorption cavity for containing a sodium nitrate solution, an upper part of the absorption cavity being communicated with an outlet of the evaporation cavity through a mixed gas pipe, and the absorber being provided with a reflux pipeline which communicates the absorption cavity and the liquid storage cavity.