Abstract:
An electrochemical direct heat to electricity converter includes a primary thermal energy source; a working fluid; an electrochemical cell comprising at least one membrane electrode assembly including a first porous electrode, a second porous electrode and at least one membrane, wherein the at least one membrane is sandwiched between the first and second porous electrodes and is a conductor of ions of the working fluid; an energy storage reservoir; and an external load. The electrochemical cell operates on heat to produce electricity. When thermal energy available from the primary thermal energy source is greater than necessary to meet demands of the external load, excess energy is stored in the energy storage reservoir, and when the thermal energy available from the primary thermal energy source is insufficient to meet the demands of the external load, at least a portion of the excess energy stored in the energy storage reservoir is used to supply power to the external load.
Abstract:
A cryogenic compressor for compressing hydrogen and oxygen and method for compressing these two gases. In a first preferred embodiment, an electrochemical compressor (12) is operative to compress hydrogen and oxygen gas. These two gases separately enter chamber (120 and 132) in an enclosure (118). Between the two chambers is disposed a catalytic membrane (124), sandwiched between a porous cathode (122) and a porous anode (126). A catalytic reaction combines the gases to form water, producing an electrical current as a byproduct. Adjacent chamber 132 are disposed a porous anode (134) and a porous cathode (138), sandwiched on each side of a catalytic membrane (136). An electric potential applied to porous anode (134) and porous cathode (138) transports water molecules and hydrogen from chamber (132) through catalytic membrane (136) into a chamber (140). The pressure in chamber (140) is substantially greater than the pressure in chamber (132). Yet another porous anode (142) and a porous cathode (146), sandwiched on each side of a catalytic membrane (144), are operative to dissociate the pressurized water into oxygen molecules, hydrogen ions, and free electrons in response to an applied electrical potential. The free electrons combine with the hydrogen ions to form hydrogen molecules. Both the oxygen and hydrogen gas streams produced by the latter catalytic reaction are at a substantially higher pressure than the gases entering the compressor. A second preferred embodiment uses a mechanical water pump (74) to pressurize water instead of the second catalytic reaction.
Abstract:
An electrochemical direct heat to electricity converter includes a primary thermal energy source; a working fluid; an electrochemical cell comprising at least one membrane electrode assembly including a first porous electrode, a second porous electrode and at least one membrane, wherein the at least one membrane is sandwiched between the first and second porous electrodes and is a conductor of ions of the working fluid; an energy storage reservoir; and an external load. The electrochemical cell operates on heat to produce electricity. When thermal energy available from the primary thermal energy source is greater than necessary to meet demands of the external load, excess energy is stored in the energy storage reservoir, and when the thermal energy available from the primary thermal energy source is insufficient to meet the demands of the external load, at least a portion of the excess energy stored in the energy storage reservoir is used to supply power to the external load.
Abstract:
A water evaporation type cooling system equipped with a hermetically sealed housing and a solid electrolytic membrane placed to divide the hermetically sealed housing into first and second hermetically sealed spaces. Water is reservoired within the first hermetically sealed space, while a condenser is situated to communicate with the second hermetically sealed space. A direct-current voltage is applied to the solid electrolytic membrane, with the result that a water electrolytic reaction takes place on its first hermetically sealed space side surface, while a water production reaction occurs on its second hermetically sealed space side surface. Protons produced by the water electrolysis pass through the solid electrolytic membrane to contribute to a water production reaction. Steam within the first hermetically sealed space is transferred to the second hermetically sealed space whereas the oxygen within the second hermetically sealed space is shifted to the first hermetically sealed space. Thus, the humidity within the first hermetically sealed space falls to accelerate the evaporation of the water reservoired within the first hermetically sealed space, thereby inducing a temperature drop.
Abstract:
The system generally includes an electrochemical pump for pressurizing a cryogenic gas, a heat exchanger for cooling the gas to below its inversion temperature, a Joule-Thomson flow restrictor to cool the gas by adiabatic expansion, a load heat exchanger that is thermally coupled to an electronic component or surface that requires cryogenic cooling, and a low-pressure flow path back to the pump. One or more reservoirs can be provided in the high-pressure and low-pressure flow paths. The flow paths can be thermally coupled by one or more regenerative heat exchangers. The electrochemical pump can be adapted to transport either protons or hydronium ions. Protons are preferably transported using pump components that do not contain water in any chemical form. Either hydrogen or oxygen can serve as the cryogen. Where hydrogen is the cryogen, the high-pressure flow path can be provided with a catalytic surface to convert ortho-hydrogen to para-hydrogen, and the low-pressure flow path can bear a catalyst to promote the reverse reaction.
Abstract:
An electrochemical direct heat to electricity converter includes a primary thermal energy source; a working fluid; an electrochemical cell comprising at least one membrane electrode assembly including a first porous electrode, a second porous electrode and at least one membrane, wherein the at least one membrane is sandwiched between the first and second porous electrodes and is a conductor of ions of the working fluid; an energy storage reservoir; and an external load. The electrochemical cell operates on heat to produce electricity. When thermal energy available from the primary thermal energy source is greater than necessary to meet demands of the external load, excess energy is stored in the energy storage reservoir, and when the thermal energy available from the primary thermal energy source is insufficient to meet the demands of the external load, at least a portion of the excess energy stored in the energy storage reservoir is used to supply power to the external load.
Abstract:
The invention exploits a widely used device in micro-fluidics, the electro-osmotic pump (EOP), to create very low energy micro-scale and macro-scale mechanical actuators. The EOP uses electrical fields to move naturally occurring charged particles (ions) through a fluid medium. As the ions move in response to the applied field, they drag the (non-charged) fluid along, establishing bulk flow. When confined to a narrow chamber, a pressure gradient can be established. The combination of pressure gradient and flow performs mechanical work. With the use of electro-osmotic pumps, the invention enables actuators to be constructed in a variety of embodiments, including for example, a sheet structure, a piston structure, and a cellular structure to name a few.
Abstract:
A Joule-Thomson refrigeration cycle is disclosed having an electrochemical compressor with a solid polymer electrolyte membrane. The cycle includes a reversible drive power source for pumping working fluid in opposite directions through the compressor, thereby insuring that the membrane is continuously hydrated.
Abstract:
A cryogenic cooling system using hydrogen as a primary refrigerant fluid and oxygen as a secondary refrigerant fluid to precool the hydrogen gas below its inversion temperature. In a first embodiment, the cryogenic cooling system (10) includes an electrochemical compressor (12) operative to compress hydrogen and oxygen gas without any moving parts. Compressed oxygen from the electrochemical compressor passes through a regenerative heat exchanger (24) in heat transfer relationship with low pressure oxygen, and expands through a Joule-Thomson expansion valve (28) absorbing heat from a compressed hydrogen gas stream in a precooler heat exchange (30). The low pressure oxygen provides additional cooling in a parasitic heat exchangeer (36), returning to the electrochemical compressor through the regenerative heat exchanger (24). Compressed hydrogen flows through a regenerative heat exchange (44) in heat transfer relationship with low pressure hydrogen, and is precooled as it passes through the precooler heat exchanger. A second regenerative heat exchaner (50) provides additional heat transfer with the low pressure hydrogen gas stream prior to expansion of the compressed hydrogen in a Joule-Thomson expansion valve (54). The expanding hydrogen cools a load in heat exchanger (58), returning to the electrochemical compressor through regenerative heat exchangers 44 to 50. In the second embodiment, a mechanical water pump is provided to compress water, which is used as an intermediate media between the low pressure and high pressure hydrogen and oxygen gas streams. In both embodiments, the hydrogen and oxygen gas are electrochemically combined into water using a catalytic membrane (124) and then disassociated by electrolysis into their respective oxygen and hydrogen gas streams using another catalytic membrane (144).
Abstract:
It is an object of the present invention to provide a water-evaporation type cooling apparatus which uses a solid-state electrolytic element, is free from an environmental protection problem, is soundless, and has a small size. An solid-state electrolytic element 50 is arranged to partition an airtight can 51 into spaces 51a, 51b, water 53 is reserved in the space 51a, and a condenser 55 is arranged to communicate with the space 51b. A water-reservation portion of the space 51a communicates with a water-reservation portion of the condenser 55 through a water path 57, and gas-phase portions of the spaces 51a, 51b communicate with each other through a ventilation path 58. A power is supplied from a DC power supply 52 to the solid-state electrolytic element 50 to make water decomposition reaction on an anode side and water generation reaction on a cathode side. A thermal connection surface 59 of a bottom portion of the space 51a is shaped into an outer surface shape along the outer surface shape of a target object 54.