13 results about "Transcritical cycle" patented technology

The invention discloses a CO2 transcritical refrigeration system recooling gas-liquid separation device and method, two-stage throttling is adopted, and a recooler and a gas-liquid separator are arranged after first-stage throttling. The recooler takes low-temperature saturated gas shunted from an outlet of the evaporator as a cold source to cool a two-phase mixture subjected to primary throttling; saturated liquid separated by the gas-liquid separator enters the evaporator after being subjected to secondary throttling, and saturated gas flows back to an inlet of the recooler. On the basis of two rigid constraints, namely evaporation pressure reference and charge volume fixation, the equivalent condensation pressure which is physically locked is introduced into the transcritical cycle for the first time, so that the system obtains fixed high-pressure reference. Thermodynamic derivation shows that the recooling ratio is determined by evaporation pressure and uniqueness, and the operation is completely physically adaptive. Simulation results show that the COP under the air conditioner working condition reaches 3.038, is improved by 38.2% compared with that of a basic system and is superior to that of an existing split-flow supercooling technology (17.62%). The compressor only needs to maintain simple frequency modulation of evaporation pressure without a complex algorithm. The device is suitable for CO2 transcritical systems such as air conditioners, heat pumps and freezing and refrigerating.

The invention relates to the technical field of heat pump systems, and discloses a transcritical cycle-based heat pump waste heat recovery system, which comprises a compression module, a heat exchange scheduling module, a phase state separation module, a flow control module, a heat absorption module and a flow path topology control module, according to exhaust pressure and exhaust temperature parameters of a compression module, rehearsing a candidate communication state to generate a target communication feature set, calculating a configuration transition deviation value of the target communication feature set relative to a current communication feature set, determining a physical switching constraint weight and introducing thermodynamic efficiency evaluation logic, and when an evaluation result meets a migration criterion, determining a physical switching constraint weight; according to the method, the physical deviation cost of flow path configuration transition is quantified, dynamic matching of a refrigerant heat release track and a heat source side temperature gradient field is achieved, the problem of heat transfer temperature difference distortion is solved, and disordered oscillation of a physical flow path is restrained.

The utility model provides a transcritical cycle-based multi-energy combined supply system. The transcritical cycle-based multi-energy combined supply system comprises a clean energy utilization system, an energy storage system, a supercritical medium power generation system, a supercritical medium refrigeration system, a combined heat and power generation system and a control system, the supercritical medium power generation system comprises a first gas-liquid separator, a compressor and a high-pressure turbine; the output end of the heat storage system is connected with the input end of the first gas-liquid separator, the energy storage medium output end of the first gas-liquid separator is connected with the input end of the combined heat and power generation system, the supercritical medium output end of the first gas-liquid separator is connected with the first input end of the compressor, and the first output end of the compressor is connected with the input end of the high-pressure turbine. The second output end of the compressor is connected with the supercritical medium input end of the cold storage system. According to the scheme, through coupling application of a supercritical medium technology and an energy storage medium heat storage technology, a comprehensive energy service system integrating efficient energy conversion, flexible energy storage adjustment and multifunctional cooling, heating and power supply is constructed.

The invention discloses a novel structural form brazed plate heat exchanger for a transcritical CO2 heat pump water heater, which adopts an integrated brazed structure to replace the traditional sealing gasket design aiming at the requirements of high pressure (8-12MPa), supercritical state physical property mutation, pseudo-critical zone specific heat capacity peak value and high flow rate of CO2 transcritical cycle. The heat exchange efficiency of an existing herringbone corrugated plate type heat exchanger is improved by optimizing the corrugated form of the plate sheets and the sectional layout of the flow channels to adapt to the CO2 characteristic. The novel brazed plate type heat exchanger specifically comprises a plate sheet main body, fluid inlet and outlet corner holes and a heat exchange area are formed in the plate sheet main body, and high-pressure corrosion resistant metal plate sheets form a leakage-free plate bundle through braze welding. The surface of the plate sheet is provided with a sectional corrugated structure (the inclination angle of a high-temperature section is 40 degrees, the inclination angle of a medium-temperature section is 50 degrees, the inclination angle of a low-temperature section is 60 degrees, and a hollow turbulent flow column is additionally arranged), and each temperature section is matched with the physical property change in the CO2 supercritical condensation process; the reinforcing ribs and the brazing grooves are arranged on the edges of the sheets, so that the overall compression strength is improved. The structure solves the problems that a traditional heat exchanger is insufficient in pressure resistance, and the heat exchange efficiency is not matched with the CO2 physical property, and is suitable for a transcritical CO2 heat pump system.

The application belongs to the technical field of ship power and distributed energy, and particularly relates to a marine combined heat and power system based on a compact reformer and an application method. The system comprises a combined heat and power module and a transcritical CO2 cycle module. The combined heat and power module converts the chemical energy of gaseous fuel into electric energy and generates combustion tail gas. The transcritical CO2 cycle module recovers and utilizes the waste heat of the combustion tail gas to generate power. The application overcomes the defects of the separation of the pre-reformer and the after-burner structure, the large system volume and the long heat and mass transfer path in the prior art, solves the problems of low high-grade waste heat utilization rate and low system comprehensive energy efficiency in the prior art, and realizes the collaborative optimization of system miniaturization, multi-stage efficient energy utilization and extremely low emission.

The invention relates to a carbon dioxide refrigeration and heating and negative pressure defrosting water recovery process method for a freeze dryer. According to the process method, a gas cooler, a heating plate group, a heating medium pump and the like of a carbon dioxide heating part are included; the carbon dioxide refrigeration part comprises a low circulation barrel, a refrigerant pump, a cold trap, an air cooler and the like; supercooling the common part and the like; and the negative-pressure defrosting water recovery part comprises a negative-pressure steam generator, a drainage pump, a recovery water tank and the like. The method is characterized in that an environment-friendly working medium is selected, a carbon dioxide transcritical cycle technology is adopted, the excellent low-temperature refrigeration performance and the transcritical temperature slippage heat exchange characteristic of carbon dioxide are fully utilized, the effect that the COP of both refrigeration and heating of a reverse Carnot cycle is larger than 1 is exerted, the freeze-drying refrigeration and heating processes are combined into one, heating equipment with the COP smaller than 1 and power consumption are omitted, and the cost is reduced. Therefore, the super effect that the comprehensive COP is greater than 6 is achieved; the negative pressure defrosting technology is adopted, a low-quality heat source of the system is fully utilized, complete recovery of pure plant raw material water is achieved, and the raw material utilization rate is close to 100%.

The application provides a kind of carbon dioxide new energy vehicle heat pump system based on ejector circuit, relating to new energy automobile air conditioning technical field, including circulation module, for relying on CO2 transcritical cycle characteristics;Power and heat exchange module, for compressing low-temperature and low-pressure carbon dioxide refrigerant into high-temperature and high-pressure state;Loop control and ejection enhancement module, for controlling the flow direction and state of refrigerant;Gas-liquid separation and oil return module, for receiving gas-liquid mixed refrigerant from the ejector through the gas-liquid separator, realizing gas-liquid separation through gravity settling, and realizing oil return through oil return pipeline;State detection and repair module, for real-time acquisition of operating parameters of key nodes of the system, and intelligent repair using fault strategy library.

This application discloses a highly integrated thermal management method using R744 refrigerant, relating to the field of thermal management technology. The method includes the following steps: constructing a transcritical circulation loop based on R744 refrigerant, and sequentially arranging a compressor, gas cooler, gas-liquid separator, and high-pressure plate heat exchanger within the transcritical circulation loop; simultaneously configuring a power battery water circulation loop, an air conditioning water circulation loop, and an electric drive waste heat recovery loop; and forming a multi-loop switchable fluid path structure through a four-way valve, a three-way proportional valve, and multiple water pumps; utilizing the high-pressure plate heat exchanger as a multi-loop heat exchange node. This application achieves priority heat distribution across multiple loops through valve control, ensuring stable heat dissipation of the electric drive system at high temperatures and improving heating capacity and battery performance at low temperatures; simultaneously, it improves structural compactness and reliability through modular water circuit design, and utilizes waste heat to reduce energy consumption and refrigerant usage, thereby improving overall vehicle efficiency and safety.

The application relates to the field of compressor control, in particular to a two-stage air-supply enthalpy-increasing compressor control method based on a carbon dioxide transcritical cycle. The method comprises the following steps: acquiring a set of real-time running state information of a vehicle, based on which, multi-dimensional system state representation and optimal target fusion analysis are carried out to generate a dynamic optimal exhaust pressure target value; based on the dynamic optimal exhaust pressure target value, dynamic coupling and decoupling of a main control channel and an auxiliary control channel and collaborative instruction distribution are carried out to generate a set of collaborative control instruction information of the compressor and an electronic expansion valve; based on the set of collaborative control instruction information, feedforward prediction compensation and timing inertia smoothing management are carried out in combination with measurable disturbance information to generate a set of final actuator driving instruction information after disturbance smoothing; and based on the set of final actuator driving instruction information, safety driving instructions and parameter online fine adjustment learning are carried out to generate a set of two-pole compressor control optimization information. In the compressor control process, the application can maintain the optimal efficiency and pressure stability of the system under transient conditions.

The invention discloses a distributed gas-liquid separation system which comprises an outdoor unit and at least two tail ends, a distributed gas-liquid separation unit is independently arranged at the front end of each tail end or the front end of each group of tail ends, and each unit comprises a first-stage throttling valve, a recooler, a gas-liquid separator and a second-stage throttling valve. According to the system, the high-pressure side state is independently locked through all the distributed units, and it is ensured that the working medium entering the second-stage throttling valve is saturated liquid. The system is suitable for subcritical and transcritical cycles, and is used for multi-split air conditioners, direct expansion air conditioners, heat pump water heaters, refrigeration equipment, electric automobiles, energy storage temperature control, rail transit, temporarily-built facilities, mobile air conditioners and the like. The distributed configuration solves the problem of unbalanced pressure of long piping and multiple branches, eliminates the most unfavorable end effect, and improves the action range and installation flexibility. And single-machine exclusive configuration, grouping sharing configuration or segmented sharing configuration can be selected, so that optimal balance between performance and cost is realized. The household metering module based on the dryness physical reference can achieve accurate measurement of cold and heat, and the fair charging requirement is met.

The utility model discloses a water quenching heat energy utilization system for lead-zinc volatile kiln slag. The water quenching heat energy utilization system comprises a hot water conveying pipeline, a filter, a CO2 transcritical cycle heat pump, an air conveying pipeline, a cylindrical dryer and a material conveying device, a water inlet of the filter is connected with a water outlet of the water quenching pool through a hot water conveying pipeline, and a water outlet of the filter is connected with a water inlet of the CO2 transcritical cycle heat pump through a pipeline, so that normal-temperature air entering the CO2 transcritical cycle heat pump is heated by utilizing heat energy of hot water discharged from the water quenching pool; an air outlet of the CO2 transcritical cycle heat pump is connected with a feeding port of the cylinder dryer through an air conveying pipeline so that wet zinc leaching residues entering the cylinder dryer can be pre-dried through hot air, a discharging port of the cylinder dryer is connected with the material conveying device, and the material conveying device is connected with a material inlet of the lead-zinc volatilization kiln. The wet zinc leaching residues are preheated and dried through heat energy carried by hot water generated through water quenching, the energy utilization rate is increased, and fossil energy consumption is reduced.

The invention discloses a transcritical carbon dioxide coupling circulation system and device and a control method, and relates to the technical field of refrigeration and heat energy. The system comprises a compressor unit for compressing input low-temperature and low-pressure gaseous CO2 into high-temperature and high-pressure transcritical CO2, and a first cooling device for cooling the high-temperature and high-pressure transcritical CO2; the first CO2 heat exchanger group is used for carrying out coupling heat exchange on the low-temperature low-pressure liquid CO2 and the high-temperature high-pressure liquid CO2; and the second CO2 heat exchanger group is used for carrying out coupling heat exchange on the low-temperature low-pressure liquid CO2 and the low-temperature high-pressure liquid CO2. According to the technical scheme, the refrigerating capacity and the refrigerating coefficient of the transcritical COcirculation system can be remarkably increased, the heat energy utilization rate can be increased in the heating aspect, and energy consumption is reduced. Wide application of the transcritical COC cycle technology in the field of refrigeration and heat supply is promoted, and good environmental protection benefits and social benefits are achieved.

The present specification relates to the technical field of industrial heat pump, and particularly relates to a transcritical CO2 cycle system capable of realizing 120 DEG C high-temperature heat tracing of petroleum process and a control method thereof. The cycle system comprises a water pump, a gas cooler, an air source evaporation component, a waste heat superheater and a compressor; the gas cooler, the air source evaporation component, the waste heat superheater and the compressor are sequentially connected, and the water pump is connected with the gas cooler; the water pump is used for providing water to be heated to the gas cooler; the gas cooler is used for heat exchange between supercritical carbon dioxide working medium and the water to be heated; the air source evaporation component is used for heat exchange between an external environment and carbon dioxide working medium output by the gas cooler; the waste heat superheater is used for heat exchange between waste heat resources and carbon dioxide working medium output by the air source evaporation component; and the compressor is used for compressing carbon dioxide working medium output by the waste heat superheater to obtain supercritical carbon dioxide working medium. The embodiment of the present specification can improve the temperature and stability of heat supply.