摘要:
A system and method for thermoelectric energy storage is described. A thermoelectric energy storage system (22, 36) having a heat exchanger (30) which contains a thermal storage medium, and a working fluid circuit for circulating a working fluid through the heat exchanger (30) for heat transfer with the thermal storage medium. The working fluid undergoes transcritical cooling during the charging and transcritical heating during the discharging cycle as it exchanges heat with the thermal storage medium. Improved roundtrip efficiency is achieved through minimising the maximum temperature difference (”Tmax) between the working fluid and the thermal storage medium during operating cycles.
摘要:
A system and method for thermoelectric energy storage is described. A thermoelectric energy storage system (22, 36) having a heat exchanger (30) which contains a thermal storage medium, and a working fluid circuit for circulating a working fluid through the heat exchanger (30) for heat transfer with the thermal storage medium. The working fluid undergoes transcritical cooling during the charging and transcritical heating during the discharging cycle as it exchanges heat with the thermal storage medium. Improved roundtrip efficiency is achieved through minimising the maximum temperature difference (ΔTmax) between the working fluid and the thermal storage medium during operating cycles.
摘要:
A heat pump includes an evaporator 10 evaporating water; a steam compressor 1 compressing the vapor generated by the evaporator 10; a vapor supply duct 31 adapted to supply the vapor 30 compressed by the compressor 1 to steam-utilizing facility 2; a measuring device 91 for measuring a state of vapor between the evaporator 10 and the compressor 1; and a valve 81 adjusting an amount of vapor flowing in the compressor 1 based on information from the measuring device 91.
摘要:
The invention relates to a pumped-heat electricity storage device (1) comprising a charging circuit (100) and a discharging circuit (200) for conveying a working gas (A), wherein the charging circuit (100) and the discharging circuit (200) comprise a common regenerator (120), which is switchably connected either to the charging circuit (100) or to the discharging circuit (200) in a fluid-conducting manner in order to form a closed circuit and in order to supply the working gas (A) to the regenerator (120), wherein the charging circuit (100) comprises a first turbocompressor (110) and a first turboexpander (140), wherein the first turbocompressor (110) is driven by the first turboexpander (140) and by an electric motor (170), wherein the discharging circuit (200) comprises a second turboexpander (250) and a second turbo compressor (210), wherein the second turboexpander (250) drives the second turbocompressor (210) and a generator (290), and comprising a control device (500) and a density-changing device (300), which make it possible to controllably change the pressure of the working gas (A) in the charging circuit (100) and/or in the discharging circuit (200) in order to control the power that can be taken in by the first turbocompressor (110) or the power that can be output by the second turboexpander (250).
摘要:
An energy storage apparatus includes a first circuit containing a first phase change material, second circuit containing a second phase change material, and a heat pump having a cold side heat exchanger thermally coupled to the first circuit and a hot side heat exchanger thermally coupled to the second circuit. The apparatus is operable in a charging mode, a storage mode, and a discharge mode. In the charging mode the heat pump is energized to cool the first phase change material and heat the second phase change material. In the storage mode the first phase change material is stored in a first storage vessel and the second phase change material is stored as a pressurized vapor in a second storage vessel. In the discharge mode vaporized first phase change material is expanded by a first expander, or the vaporized second phase change material is expanded by a second expander.
摘要:
In an energy storage and recovery system,working fluid from a first vessel is compressed by power machinery and passes, via a regenerator, into a second vessel, where it is forced to condense, the temperature and pressure of the saturated working liquid/vapour mixture continuously rising during storage. The stored energy is recovered by the vapour returning through the regenerator and power machinery where it expands to produce work before condensing back into the first vessel. The regenerator comprises a gas permeable, solid thermal storage medium which, during storage, stores superheat and some latent heat from the vapour passing through it in respective downstream regions that exhibit continuously increasing temperature profiles during storage and a small temperature difference with the surrounding vapour, thereby minimising irreversible losses during the thermal energy transfers.
摘要:
A system and method for electro-thermal energy storage wherein the system comprises: a hot thermal storage arrangement (1) comprising a hot storage heat exchanger (11); a cold thermal storage arrangement (2) comprising a cold storage heat exchanger (21); a thermodynamic cycle unit configured to transfer thermal energy from the cold storage arrangement to the hot storage arrangement in a charging mode, and to convert thermal energy from the hot storage arrangement into work and, preferably, subsequently into electric energy in a discharging mode, wherein the thermodynamic cycle unit comprises a fluid circuit for circulating a working fluid through the hot storage heat exchanger as well as through the cold storage heat exchanger, wherein the fluid circuit further comprises a pump (31) for maintaining a circulation of working fluid in the discharging mode and a first turbine (321) for expanding working fluid in the discharging mode; and wherein the thermodynamic cycle unit comprises a second turbine (322) for expanding working fluid in the discharging mode, said second turbine being connected in series with the first turbine so that working fluid may flow from the first to the second turbine in the discharging mode, and an intercooling heat exchanger (33) located in the fluid circuit between the first and the second turbine.
摘要:
A system and method for thermoelectric energy storage is described. The system has a charging cycle (10) for providing thermal energy to a hot thermal storage arrangement (18, 20, 22) and an evaporative ice storage arrangement (24) and a discharging cycle (30) for generating electricity by retrieving the thermal energy. The evaporative ice storage arrangement (24) comprises a heat exchanger (14, 36), an ice slurry storage tank (26), a vacuum evaporation chamber (28) and a slurry heat exchanger (40). The evaporative ice storage arrangement (24) of the present invention functions as a dedicated cold storage for the thermoelectric energy storage system. The cold storage is realized by producing an ice-water mixture during charging of the storage, and using the stored ice-water mixture to condense the working fluid during the discharge cycle (30). Use of this sub-triple-point evaporation arrangement functions to increase the round-trip efficiency of the TEES system through minimising the maximum temperature difference between the working fluid and the thermal storage medium during operating cycles.
摘要:
A heat energy recovery apparatus include a compressor (10) which has a piston (12) for compressing sucked-in working gas; a heat exchanger (20) which makes the working gas compressed by the compressor (10) absorb heat of high temperature fluid; an expander (30) which has a piston (32) to be moved under pressure by expansion of the heat-absorbed working gas; and an accumulator (60) which stores the working gas compressed by the compressor (10) when required output is low or heat receiving capacity of the working gas is small. The apparatus preferably include a blocking unit (38) which blocks discharge of the working gas from the expander (30) when the heat receiving capacity of the working gas is small and the compressed working gas to the accumulator (60) is being stored.
摘要:
A supercritical carbon dioxide power generation Brayton cycle system and method that employs an alternate heat recuperation method and apparatus that utilizes switched banks of bead filled tanks to accumulate and recover the thermal energy of the two streams of working fluid in such a way that the variable thermal properties of the supercritical carbon dioxide can be accommodated without significant loss of thermal efficiency.