110 results about "Enthalpy" patented technology

The invention relates to the technical field of spraying control, and discloses a spraying process self-adaptive adjustment method and system based on temperature measurement, and the method comprises the steps: presetting multi-sensor parameters, calculating a dynamic weight, calibrating sensors, and solving the problems of real-time interference and cross-process sensitivity difference; acquiring environmental data of a target spraying process, generating a global temperature field thermodynamic diagram, associating the film thickness with an environmental interference label, and providing a three-dimensional reference; coating workpiece heat flux and empty workpiece heat flux are collected, net heat flux and real-time reaction enthalpy change are calculated, a three-dimensional curing degree model is constructed, and the real-time curing degree is calculated to reflect the coating film curing progress; based on real-time curing degree fusion temperature spatial-temporal characteristics and phase change characteristics, core characteristics are extracted, a digital twin model is established to preview a process adjustment effect, an optimal control vector is output by constructing a spray gun three-dimensional optimization function and an improved quantum genetic algorithm, a targeted actuator is triggered for regulation and control, and a coating thermodynamic parameter library is constructed. And updating model parameters to optimize the overall situation.

The invention discloses a thermal power generating unit coordination control data and mechanism hybrid modeling method and device, computer equipment and a computer readable storage medium, and relates to the technical field of thermal energy engineering and power system modeling and control. Establishing a high-precision dynamic mechanism model of the working medium flow and heat transfer process of the boiler-steam turbine system; then, constructing an error correction model fusing the long-short-term memory network, the convolutional neural network and residual connection; and finally, fusing the mechanism model and the error correction model through parallel computing to form a dynamic hybrid model with physical interpretability and high precision. Through the hybrid modeling strategy, the prediction accuracy of key parameters such as the main steam pressure, the separator outlet steam enthalpy value and the unit load in the wide load range, especially under the dry-state operation working condition is remarkably improved, and a reliable model basis is provided for designing an advanced unit coordination control system.

The invention relates to the technical field of oxygen-enriched combustion safety and flammability limit prediction, and provides a flammability limit value prediction method and application, and the method comprises the steps: obtaining the initial parameters of a gas fuel in a mixed atmosphere of oxygen and carbon dioxide; simulating a combustion process by using an element reaction mechanism, and outputting a curve of component mole fractions changing along with time; the combustion enthalpy change rate under the target atmosphere and the virtual atmosphere is calculated based on the curve, and carbon dioxide in the virtual atmosphere is replaced with virtual gas which has the same thermophysical property but does not have chemical reactivity; respectively calculating combustion heat release, mixture heat absorption and heat radiation; and in combination with the enthalpy change rate and the energy balance equation, the combustible limit value is solved and determined through numerical iteration. By quantifying the chemical effect and thermophysical influence of carbon dioxide, the problem of insufficient precision caused by neglecting the participation of carbon dioxide in reaction and unique thermal property in the oxygen-enriched combustion environment in the existing model is solved, and the method is suitable for the safety design of a combustion system.

The invention discloses a compressed air system energy efficiency intelligent evaluation method based on environment compensation. The method comprises the following steps: firstly, acquiring operation performance parameters, air quality parameters and environment parameters, establishing thermophysical property mapping by using an enthalpy-humidity diagram, and forming a quality coupling characteristic data set; meanwhile, a theoretical energy efficiency reference surface and a thermodynamic constraint set are constructed based on an isentropic compression principle and a historical optimal sample. Then, a nonlinear machine learning model is trained, and a nonlinear mapping relation between environment parameter changes and performance and quality offsets is learned; the model converts operation parameters in a real-time non-standard environment into equivalent operation performance parameters under a standard environment condition. And during evaluation, mapping the equivalent operation parameters to a theoretical energy efficiency reference surface, and calculating a distance vector to obtain an evaluation result reflecting the energy efficiency deviation degree and the performance degradation degree of the system. According to the method, environmental interference is effectively eliminated, and the accuracy and comparability of energy efficiency evaluation of the compressed air system are remarkably improved.

The application discloses a kind of air source heat pump's air supplement enthalpy control method.It includes: according to the difference of current period's air supplement superheat and the reference safety superheat of current period, determine the air supplement instantaneous difference value of current period;According to the air supplement instantaneous difference value of current period, the air supplement superheat safety difference value of last period and the change trend difference value of current period, determine the air supplement superheat safety difference value of current period;According to the air supplement superheat safety difference value of current period determines corresponding steady control strategy, to control the air supplement expansion valve of air source heat pump according to steady control strategy.By constructing air supplement superheat safety difference value, air supplement state is expanded from traditional binary judgment to continuous quantitative index, so as to execute corresponding steady control strategy according to the quantitative index subsequently, control the opening of air supplement expansion valve, to solve the problem that traditional binary judgment cannot quantify liquid-carrying risk.

The invention provides a method and a device for calculating a freezing process when a supercooled liquid drop impacts an ice surface, and belongs to the technical field of ice prevention and deicing, and the method comprises the following steps: obtaining an initial parameter of the supercooled liquid drop; calculating the first temporary speed, temperature and enthalpy value according to an MPS method; the phase state of the supercooled liquid drops is determined according to the relation between the enthalpy value and the latent heat; a dissipation factor is calculated according to the distance from the liquid-phase supercooled liquid drop to the nearest ice-phase supercooled liquid drop and the enthalpy value of the liquid-phase supercooled liquid drop, and a momentum dissipation source item is determined based on the dissipation factor; adding a second temporary step between the temporary step and the correction step of the MPS method, and implicitly calculating a second temporary speed; replacing the first temporary speed with a second temporary speed, performing pressure Poisson equation solution according to an MPS method, calculating a correction speed based on the pressure gradient, and obtaining the actual speed of the supercooled liquid drop based on the correction speed and the second temporary speed; and updating the space coordinate of the supercooled liquid drop based on the actual speed of the time step, wherein the space coordinate of the supercooled liquid drop is used for reflecting the ice type change.

The application discloses a steam temperature control method and device, a storage medium and an electronic device, relates to the technical field of control, and the method comprises the following steps: acquiring the current steam flow of a boiler, the current swing angle of a burner and the current flue gas temperature of a superheater inlet in a steam temperature control system of a thermal power plant; acquiring a superheater inlet and outlet enthalpy increase model; calculating the current steam flow, the current swing angle and the current flue gas temperature according to the superheater inlet and outlet enthalpy increase model to obtain the first inlet and outlet enthalpy increase of the superheater; calculating according to the first inlet and outlet enthalpy increase to obtain a target temperature value of the superheater inlet, and controlling the steam temperature of the superheater inlet according to the target temperature value. Through the application, the problem that the steam temperature is adjusted by a PID controller in the related art, resulting in relatively low accuracy of steam temperature control, is solved.

The invention discloses a refrigeration enthalpy increasing control method and system based on intermediate pressure and multi-parameter coupling. The method comprises the steps that the intermediate pressure, the operation frequency of a compressor and the temperature of a coil pipe are collected in real time; the basic enthalpy increasing opening degree is determined on the basis of the intermediate pressure, a dynamic compensation value is calculated on the basis of the coil pipe temperature, the basic enthalpy increasing opening degree is combined with the dynamic compensation value, and the target opening degree of the electronic expansion valve for enthalpy increasing is determined; and the electronic expansion valve for enthalpy increasing is adjusted according to the target opening degree of the electronic expansion valve for enthalpy increasing, and therefore refrigeration enthalpy increasing control is achieved. According to the invention, rapid response, accurate adjustment and system protection of enthalpy increase control are realized.

The invention discloses a warm core temperature estimation method and device, computer equipment and a computer program product, and the warm core temperature estimation method comprises the following steps: according to a warm core temperature estimation coefficient theta h, an enthalpy value h2 of CO2 at an outlet side of a compressor, an enthalpy value h3 of CO2 at an outlet side of a gas cooler, and an equivalent enthalpy value hg of CO2 in a transcritical zone representing the warm core temperature, calculating a warm core temperature estimation coefficient theta h; determining the equivalent enthalpy value hg, est of the transcritical zone CO2 representing the warm core temperature according to the reference value hmin of the est; and according to the equivalent enthalpy value hg, est and the pressure Pg, hi of the CO2 in the transcritical zone, the estimated temperature Tg, est of the warm core is determined. According to the warm core temperature estimation method, the warm core temperature is mapped through the equivalent enthalpy value of the CO2 in the transcritical zone based on the sensible-heat-like heat exchange characteristic of the CO2 heat pump system on the high-pressure side, and the accuracy of warm core temperature estimation can be improved.

The embodiment of the invention discloses a physical embedded closed-loop high-entropy alloy laser additive manufacturing performance oriented intelligent design method. By constructing a high-entropy alloy mechanical property database, training a multi-algorithm collaborative integrated agent model and fusing thermodynamic and physical laws and a multi-target Bayesian optimization algorithm, combined reverse design of high-entropy alloy components and LDED process parameters is realized, the applicability, accuracy and robustness of performance prediction are improved, and the performance prediction efficiency is improved. The research and development period of new materials is shortened, and the test cost is reduced. By embedding physical constraints such as valence electron concentration, mixing enthalpy, mixing entropy, electronegativity difference and atomic size difference and comprehensively considering the influence of process factors such as laser power, scanning speed and powder feeding rate, an optimal Pareto component-process scheme is obtained under the support of finite element simulation closed-loop verification and an incremental learning mechanism; and the tensile strength and the yield strength of the high-entropy alloy under different conditions are accurately predicted and reflected.

The invention discloses a testing device for an enthalpy-increasing compressor of a flash tank, and relates to the technical field of compressor testing. The system comprises a tested compressor, the head and the tail of the tested compressor are connected in series to a main path test assembly through a refrigerant pipeline, and an enthalpy increasing path test assembly is connected between an enthalpy increasing opening of the tested compressor and the refrigerant pipeline of the main path test assembly; a loop formed by the main path test assembly comprises a condenser, a liquid storage tank, a filter, a first subcooler and a calorimeter which are sequentially connected through a refrigerant pipeline, the condenser is connected with an exhaust port of the tested compressor through the refrigerant pipeline, and the calorimeter is connected with an air suction port of the tested compressor through the refrigerant pipeline. The system is compatible with the conventional performance test of the compressor and the performance test of enthalpy increase with the flash tank, and can independently measure and calculate the flow of an enthalpy increase path; the flash tank is provided with a floating ball liquid level meter for monitoring and measurement, automatic liquid level adjustment and control can be achieved, and when a conventional performance test is switched, liquid refrigerants in the flash tank can be automatically recycled.

The present application relates to the technical field of oxygen-enriched combustion safety and flammability limit prediction, and provides a flammability limit value prediction method and application, which comprises the following steps: obtaining initial parameters of a gas fuel in an oxygen and carbon dioxide mixed atmosphere; simulating a combustion process by using a base reaction mechanism, and outputting a curve of component mole fraction changing with time; calculating a combustion enthalpy change rate in the target atmosphere and a virtual atmosphere based on the curve, wherein the carbon dioxide in the virtual atmosphere is replaced by a virtual gas with the same thermal properties but without chemical reactivity; respectively calculating a combustion heat release, a mixture heat absorption and a heat radiation; and combining the enthalpy change rate and an energy balance equation to determine the flammability limit value by numerical iteration. The present application quantifies the chemical effect and thermal physical influence of carbon dioxide, solves the problem of insufficient accuracy of existing models in the oxygen-enriched combustion environment due to the neglect of the reaction of carbon dioxide and its unique thermal properties, and is suitable for combustion system safety design.

The application provides a steam pipeline supplementary support and hanger positioning method and device, which comprises the following steps: based on the related parameters of the steam pipeline, constructing the mass conservation equation, momentum conservation equation and energy conservation equation of the steady operation of the steam pipeline under each working condition, and calculating the steam enthalpy value at the outlet of each pipe section and the saturated steam enthalpy value under the outlet pressure of the steam pipeline under each working condition based on the conservation equation; determining the transient pressure of the working medium in each pipe section based on the steam enthalpy value at the outlet of each pipe section and the saturated steam enthalpy value under the outlet pressure; determining the internal pressure equivalent stress, primary stress and secondary stress of each pipe section based on the transient pressure of the working medium in each pipe section; and positioning the support and hanger based on the internal pressure equivalent stress, primary stress, secondary stress, allowable stress and specified coefficient of each pipe section. The application can solve the problems of short service life and easy safety hazards caused by the over-limit or even failure of the pipeline support and hanger load of the steam pipeline due to the vibration or water hammer phenomenon caused by condensate.

The application discloses a large-size free piston driven high-enthalpy pulse device, and relates to the field of wind tunnel test. The device contains four operation modes, i.e. a high-total-pressure high-enthalpy reflection type shock tunnel, a low-dissociation high-enthalpy straight-through type shock tube, an ultra-high-speed expansion tube and an ultra-high-speed expansion wind tunnel. The four operation modes expand the flight envelope simulated by the wind tunnel, so that the flight environment with extremely high dynamic pressure, extremely high temperature, extremely high speed and extremely high brightness can be simulated for a long time. The application not only can simulate the flight environment in a wide area and extremely high speed, but also can provide high-quality wind tunnel test aerodynamic data for aircraft development, and expand the test capacity of the high-enthalpy pulse device.

The application provides a control method of a variable-temperature heat storage source water heat release system, which comprises the following steps: obtaining a temperature correction value of desalted water at an outlet of a steam-water mixer, a desalted water temperature at an outlet of a heat exchanger, a measured flow of bypass desalted water of the heat exchanger, and a pressure, a temperature and a flow of the desalted water at an inlet of the desalted water; calculating a enthalpy correction value of the desalted water at the outlet of the steam-water mixer, an enthalpy value of the desalted water at the inlet of the desalted water and an enthalpy value of the desalted water or steam at the outlet of the heat exchanger; calculating a flow correction value of the bypass desalted water of the heat exchanger according to the enthalpy correction value, the enthalpy value of the desalted water, the enthalpy value of the desalted water or steam and the flow of the desalted water at the inlet; taking a deviation between the measured flow and the flow correction value as an input to perform a PID operation, obtaining a opening degree instruction change amount of a bypass flow regulating valve of the heat exchanger, adjusting the regulating valve according to the change amount, and realizing the control of the system. The application can eliminate the adverse effects caused by large inertia of the system and realize the basic function of stable heat energy output of the system.

This invention provides an online measurement method for leakage from high-pressure cylinder exhaust to third-stage extraction steam in a combined-cylinder turbine unit, belonging to the field of combined-cylinder turbine operation monitoring technology. The method includes: establishing a typical data benchmark to obtain the benchmark third-stage extraction enthalpy value; real-time acquisition of boiler feedwater flow rate, exhaust parameters of each high-pressure heater and cylinder as raw parameters; preprocessing the raw data and calculating the enthalpy value at each state point based on the preprocessed data; establishing and solving the heat balance equations for each high-pressure heater based on the feedwater flow rate and enthalpy value to obtain the steam inlet flow rate of the third high-pressure heater; combining the benchmark third-stage extraction enthalpy value, high-pressure cylinder exhaust enthalpy, enthalpy after mixing of the third-stage extraction steam, and steam inlet flow rate of the third high-pressure heater to establish a set of mass and energy conservation equations for the mixer, and back-calculating the leakage amount; displaying the leakage amount in real time and providing early warning. This invention requires no shutdown modification and can accurately quantify the internal leakage from high-pressure cylinder exhaust to third-stage extraction steam online, effectively improving the unit's economy and safety.

The invention provides a method and equipment for determining the proportion of multiple fused salt components, a medium and a product, and relates to the technical field of fused salt materials. The method comprises the following steps: determining a plurality of pure components forming the multi-element molten salt, and determining an interaction coefficient between any two pure components; determining a plurality of mixing ratios of the multi-element molten salt based on the plurality of pure components; and based on the multiple mixing ratios and the interaction coefficient between any two pure components, respectively determining melting enthalpies corresponding to the multiple mixing ratios, and determining the mixing ratio with the maximum melting enthalpy in the multiple mixing ratios as the component ratio of the multi-element molten salt. According to the method, the melting enthalpy error caused by the interaction of anions in the molten salt system is corrected through the interaction of different pure components, rapid prediction of the melting enthalpy of the multi-element mixed molten salt is achieved, the prediction precision of the melting enthalpy is remarkably improved, and the method is suitable for the complex multi-element mixed molten salt system.

The application provides a heavy gas turbine air-cooled turbine aerodynamic layout design method and system, electronic equipment and a storage medium. The method comprises the following steps: step 1: obtaining the design requirements of the heavy gas turbine air-cooled turbine, and determining the turbine stage number; step 2: determining the enthalpy drop and load distribution scheme of each turbine stage; step 3: performing preliminary evaluation on the stress of the blade and the disc, if the requirement is not met, adjusting the load coefficient and the flow coefficient, if the requirement is met, entering step 4; step 4: initial meridian flow passage design, evaluating the strength of the blade and the disc after the meridian flow passage design is completed, if the requirement is not met, repeating steps 2 to 4 to perform parameter optimization, if the requirement is met, entering step 5; step 5: determining the radial distribution law of the turbine stage reaction degree; step 6: determining the radial distribution law of the aerodynamic parameter according to the one-dimensional average parameter design result; step 7: S2 inverse problem calculation; and step 8: aerodynamic performance analysis and optimization. The scheme provided by the application shortens the turbine engineering design cycle.

The embodiment of the invention provides a method and a device for measuring parameters of a high-enthalpy unbalanced flow field of an atomic oxygen and atomic nitrogen absorption spectrum, and the method comprises the steps: generating a high-enthalpy flow field at an outlet of a high-enthalpy wind tunnel nozzle, a laser absorption spectrum measurement system arranged in a high-enthalpy wind tunnel experiment section is used for carrying out synchronous measurement on the same to-be-measured flow field area of a high-enthalpy flow field, and the Gaussian half width and the integral absorption rate of an atomic nitrogen characteristic spectral line and the Gaussian half width and the integral absorption rate of an atomic oxygen characteristic spectral line are obtained; the effective absorption optical path of the laser penetrating through the high-enthalpy flow field and the pressure of the high-enthalpy flow field are obtained at the same time; setting an initial iteration value of the electron population temperature of the flow field, and based on the initial iteration value, adopting the constructed iteration algorithm to carry out iteration calculation until the temperature parameter converges to obtain a final electron population temperature; and according to the Gaussian half-width of the atomic nitrogen characteristic spectral line and the Gaussian half-width of the atomic oxygen characteristic spectral line, respectively obtaining the translational temperatures of the atomic nitrogen and the atomic oxygen.

A method for determining enthalpy includes placing a reactive sample within a sealable vessel, sealing the sealable vessel, placing the sealable vessel within a vacuum chamber, causing a vacuum to be formed within the vacuum chamber, causing the sample to react after causing the vacuum to be formed, measuring a temperature parameter during the reaction of the sample, and determine an enthalpy via the measured temperature parameter.

This invention provides a method, device, electronic device, and storage medium for continuous casting and rolling temperature monitoring. The method includes determining the current values ​​of multiple first monitoring parameters and multiple second monitoring parameters based on the current temperature distribution and multiple preset mapping relationships. Each first monitoring parameter includes a two-phase composition ratio, and each second monitoring parameter includes a weighted specific heat capacity determined based on the two-phase composition ratio. The two-phase composition ratio is determined based on the current temperature distribution, the length of the temperature range for the austenite-ferrite phase transformation, and the average temperature of the temperature range. Based on the current temperature distribution, the current value of the weighted enthalpy, the current values ​​of each second monitoring parameter, and a preset finite difference heat conduction equation, the estimated enthalpy for the next moment is determined. The current value of the two-phase composition ratio is used as the estimated ratio value for the next moment, and the estimated temperature value for the next moment is determined based on the estimated enthalpy for the next moment. This invention introduces the thermodynamic effects of the austenite-ferrite phase transformation to improve the accuracy of temperature monitoring.

The application discloses a simulation method of track control thermal jet interference effect containing temperature influence, and comprises the following steps: determining the parameters of the flow Mach number, momentum and total enthalpy according to the real flight flow conditions, and determining the parameters of the real gas jet total pressure, total enthalpy, specific heat ratio and nozzle outlet momentum according to the real track control engine gas jet parameters; determining the ground research scaled model geometric size under the condition of ensuring the geometric similarity of the research configuration and the nozzle according to the ground research flow conditions, using air or gas jet to simulate the real track control engine gas, and simulating the jet and the flow momentum ratio and the total enthalpy ratio; and obtaining the force interference factor of the track control thermal jet interference and the track control deviation by using the ground wind tunnel test or numerical simulation method. The application can be used for thermal jet interference wind tunnel test or numerical simulation.

The invention discloses a method and an algorithm for determining operation parameters of a refrigerating system of a cold therapy cabin. A sensor in the refrigerating system collects parameters, a flow sensor determines the mass composition of fluid by measuring the density of the fluid, and a pressure and temperature sensor is used for determining state parameters of the fluid. Thermodynamic parameters of the refrigerating system of the cold therapy cabin are calculated, wherein the parameters comprise the liquid-phase refrigerant density, the mass components of all gas-liquid separation components, the enthalpy value of a mixing point of each stage of condensation evaporator, the enthalpy value of each stage of condensation evaporator and the enthalpy value of the evaporator; according to thermodynamic parameters of the refrigeration system, system operation parameters are determined, and cycle components, cooling capacity and system COP are predicted; the thermodynamic efficiency of the refrigeration system is improved by determining the operation parameters of the refrigeration system of the cold therapy cabin and predicting the circulation components, the cooling capacity and the COP of the system through the algorithm, and stable and efficient operation of the refrigeration system of the cold therapy cabin is achieved according to the predicted actual operation parameters.

This invention discloses a numerical calculation method and system for the interaction between a hydrogen-ammonia blended combustion flame and the wall, belonging to the field of energy and combustion engineering. Addressing the problem that existing models struggle to simultaneously capture differential diffusion effects and wall heat loss, this invention achieves this through the following steps: Solving the governing equations including wall boundary conditions based on direct numerical simulation (DNS) to generate a high-precision dataset; constructing a small flame database containing one-dimensional free-propagating flames (FPP) and head-on quenched flames (HOQ), embedding the wall heat loss effect; mapping the database to a three-dimensional parameter space of mixing fraction, reaction process variables, and normalized enthalpy to form a small flame lookup table; solving the governing parameter equations and outputting the field variables from the lookup table; and verifying the model accuracy by comparing with DNS data. This method significantly improves near-wall flame quenching and NO reduction. x The accuracy of predictions for key processes such as generation provides technical support for the optimized design of hydrogen-ammonia burners.

The invention discloses an insulating oil thermal aging gas production mechanism analysis method and device and a computer readable storage medium, and belongs to the technical field of high-voltage bushing operation state diagnos.The method comprises the following steps that an insulating oil molecular dynamics simulation model is built, and the like. On the basis of a computational chemical simulation technical means, a free radical intermediate generated by thermal decomposition gas of the insulating oil is identified at a relatively high temperature, then the spontaneous property of a low-temperature reaction is verified by calculating free energy and enthalpy values of a wide-temperature-range reaction, and finally the free radical intermediate is introduced at a relatively low temperature close to an actual aging temperature for simulation. The insulating oil thermal aging gas production mechanism is verified and obtained, so that the efficiency of high-temperature simulation is utilized, and the rationality and accuracy of the mechanism under real working conditions are ensured through calculation and low-temperature simulation; the thermal aging gas production mechanism of the alkylbenzene insulating oil is mastered from the atomic level, theoretical and technical support is provided for aging state evaluation of the high-voltage insulating sleeve, and the application prospect is wide.

The invention belongs to the technical field of oil and gas development, and provides a wellhead expansion machine type selection method and system, a storage medium and electronic equipment.The method comprises the steps that on the basis of parameters of a gas well wellhead, the volume flow of gas produced by the wellhead is calculated, and the total available isentropic specific enthalpy drop under the two conditions of wellhead pressure and gas collection pressure is obtained; determining the well mouth parallel connection number and the expansion machine configuration mode; the isentropic specific enthalpy drop of the expansion machine is calculated based on the configuration mode of the expansion machine, the impeller diameter of the expansion machine and the rated volume flow; based on the isentropic specific enthalpy drop of the expansion machine and the total available isentropic specific enthalpy drop under the two conditions of wellhead pressure and gas collection pressure, the number of stages of the expansion machine is calculated; based on the rated rotating speed and the isentropic specific enthalpy drop of the expansion machine, the rotating speed and the isentropic specific enthalpy drop of the expansion machine are calculated and adjusted, and the final rotating speed and the final isentropic specific enthalpy drop of the expansion machine are obtained; and calculating the power of the expansion machine. The pressure energy recycling rate is increased, electric heating and use of an anti-freezing agent are reduced, and the cost is saved.

This invention discloses a transient calculation method and system for the temperature field of a phase change capsule based on a thermal network, relating to the field of phase change capsule technology. The method includes: constructing a physical model of the phase change capsule and initializing its parameters; constructing a four-node thermal network model; the phase change process: preheating stage: all heat on the solid surface is used for temperature rise, solving the four-node coupled heat transfer equations, and outputting the transient temperature values ​​of each node; melting stage: the solid surface temperature is fixed at the phase change temperature, solving the equations, calculating the enthalpy of the two-phase mixture based on the net heat flow of the gas and liquid phases, updating the solid and liquid mass and volume, and outputting the transient temperature values ​​of each node; complete liquefaction stage: the solid disappears, the liquid nodes directly exchange heat with the shell wall, calculating the heat transfer coefficient, solving the equations, and outputting the transient temperature values ​​of each node; stage transition smoothing is applied between the preheating and melting stages and between the melting and complete liquefaction stages of each node. This invention significantly improves computational efficiency, provides a complete physical model, and exhibits good numerical stability.

The application relates to the technical field of fuel cells, in particular to a generalized SOFC system energy flow calculation and visual analysis method and device, which comprises the following steps: inputting preset boundary conditions of a target generalized SOFC system, a steam reforming reaction degree parameter determined by experimental data and steady-state data into a thermodynamic calculation model, and outputting fluid components and material enthalpy values of each node of the target component; after detecting that the preset thermodynamic assumption is met, calculating actual heat exchange efficiencies of each heat exchanger, and then constructing a system energy flow distribution matrix based on the efficiencies and the component input and output enthalpy values, so as to determine a visual data structure and obtain a visual analysis result. According to the embodiment of the application, an analysis tool directly reflecting energy flow and distribution can be automatically generated according to experimental data, researchers can directly grasp the details of energy transmission and loss in the system, and the efficiency and accuracy of SOFC system research and development testing are improved.

The invention discloses an air-supplementing enthalpy-increasing heat pump system, and relates to the technical field of heat pump systems. An outlet of a compressor is sequentially connected with a condenser, a first expansion valve and an evaporator. The system is further provided with an air supply branch, the inlet end of the air supply branch is connected with a pipeline between the condenser and the first expansion valve, the outlet end of the air supply branch is connected with a middle air supply port of the compressor, and the second expansion valve is arranged at the inlet end of the air supply branch. The entropy production multi-objective optimization method comprises the following steps: 1, building a test bed, and collecting thermodynamic parameters; 2, establishing and correcting a system entropy production and performance coefficient calculation model; 3, determining a control variable and a security constraint; 4, carrying out data normalization processing, and constructing a comprehensive evaluation function; 5, performing iterative optimization, and outputting a Pareto optimal leading edge; and 6, screening control parameters, and verifying adaptability. According to the method, a comprehensive optimization index combining multi-process entropy production and COP is constructed, so that the system runs in an area with the highest performance coefficient and the lowest total entropy production in the compression process while avoiding liquid impact and overheating risks.