499 results about "Thermal balance" patented technology

The invention discloses a method for detecting the junction temperature of a chip of an LED lamp, which comprises steps of: 1. under the electric current of extremely short pulse as the same as that that of the normal work of the lamp, obtaining the relationship between the positive voltage of the two ends of the lamp and the change of the junction temperature of the chip by controlling the temperature of ambient environment; 2. under the DC normal work of the lamp, obtaining the positive voltage of the two ends of the lamp when achieving the stability of the thermal balance; and 3. substituting the positive voltage data into the relationship obtained in step 1 between the positive voltage of the lamp and the junction temperature of the chip to ensure the work junction temperature of the chip of the lamp under normal working condition. The method can exactly judge the work junction temperature of the chip of the LED lamp under different working currents, and is good for the heat dispersion of the LED lamp, the evaluation of the service life and the optimization design of the lamp.

A method and apparatus for controlling a temperature-regulated zone utilizing a thermal balance temperature control system. The thermal balance control system is a dynamic real time control system that measures the sensible thermal load in the zone, and directly regulates the BTU output of the HVAC package to balance such output with the measured sensible thermal load.

Generating a heat transfer model for building energy may comprise developing a PDE model that describes heat transfer through building envelope of a building, and developing an ODE model that describes the heat transfer and thermal balance in a space inside the building. Stepwise parameter estimation integrates the PDE model and the ODE model in generating the heat transfer model.

The invention discloses a thermal management system of a BEV (battery electric vehicle) and an air conditioning system. The thermal management system comprises a battery pack thermostat and a water heater, wherein an inlet of the water heater is connected with an outlet of a dynamic cooling system through a first water pump, an outlet of the water heater is connected with an inlet of a heating core of the air conditioning system of the vehicle, an outlet of the heating core is connected with a first inlet of a first water tank, and an outlet of the first water tank is connected with an inlet of the dynamic cooling system; the outlet of the heating core is connected with a first inlet of the battery pack thermostat through a third solenoid valve, the heating core is used for providing a heat source for the battery pack thermostat, a first outlet of the battery pack thermostat is connected with a second inlet of the first water tank, and the first inlet of the battery pack thermostat is communicated with the first outlet. The thermal management system not only can realize the heating requirement of an air conditioner of a new energy vehicle, but also can use a small amount of electric energy, recover waste heat of a motor for reheating and realize thermal balance between a heating system and a cooling system of a battery system.

A passive thermal control system maintains the operating temperature range of protected equipment within desired limits by controlling the conductive attributes of thermal interfaces and physical relationships within the system so as to achieve a desired thermal balance. In one embodiment, an integrated cell unit (100) includes a solar array (102), a Lithium ion cell (108) and an antenna assembly (114) such as a phased array antenna. In operation, a thermal gradient (116) is defined between the array (102) and the assembly (114) as the assembly (114) radiates heat from the array (102) into space. The operating temperature range of the cell (108) is controlled by appropriate design of the thermal interfaces between the cell (108) and the assembly (114) and/or interfaces within the assembly (114), such as a thermal interface associated with dielectric spacers provided between emitter pairs of the assembly (114).

The invention relates to LED heat resistance measuring technologies, in particular to a high-power LED heat resistance measuring device and a method of measuring high-power LED heat resistance thereby, and aims to solve the problem that the existing high-power LED heat resistance measuring device is low in measuring precision. LED junction temperature is controlled by controlling surface temperature of a measuring base; according to the semiconductor physical feature that LED junction temperature and heat resistance are of certain linearity, the LED junction temperature and the heat resistance are measured by measuring LED junction voltage drop. A standard power source provides an LED with standard current; a temperature control device uses PID regulating technology, and the temperature of the measuring base is balanced fast; through the adoption of contact measurement, the base and LED thermal balance period is shortened greatly; when the temperature is balanced, spot measurement of LED junction voltage drop is performed fast with low current; through the measurement of junction voltage drops of multiple temperature spots, LED voltage temperature coefficient is calculated. The high-power LED heat resistance measuring device and the method have the advantages that measuring speed is high, operation is simple, measurement precision is higher than +/-1%, and the device and the method are applicable to high-power LED heat resistance measurements.

A district energy sharing system (DESS) comprises a thermal energy circuit which circulates and stores thermal energy in water, at least one client building thermally coupled to the circuit and which removes some thermal energy from the circuit ("thermal sink") and/or deposits some thermal energy into the circuit ("thermal source"), and at least one thermal server plant that can be thermally coupled to external thermal sources and/or sinks (e.g. a geothermal ground source) and whose function is to maintain thermal balance within the DESS.

The invention discloses an aluminum cell lining struction, provided with cathode block, cell shell, which is characterized in masoning impervious brick skin, insulating brick skin and firebrick skin from upper to lower besides the floors of the cathode block and the cell shell separately, a latus breaker locating in the coupling part of the side face of these brick skins and the cell shell, masoning a breaker and a latus impervious brick between the cathode block and the inner side of the cell shell, and a side mass of silicon nitride associated with charring silicon around the upper part inside the cell shell, besides the side mass and cathode block covered with charcoal paste layer. The invention is of higher groove depth, which is available to self-extinguishing effect of cells, and of extend radiating area; a plurality of breakers for absorbing expansive power arisen from carbon blocks; good thermal balance in the industrial process of the cell, which can be prolonged cell life to 2000 days from 1500 days.

The invention discloses a subsonic velocity combustion ramjet combustion chamber and a regenerative cooling method of the subsonic velocity combustion ramjet combustion chamber. The subsonic velocity combustion ramjet combustion chamber comprises an air inlet segment, a combustion segment and a spray pipe segment. A regenerative cooling structure is arranged inside an outer shell of the combustion segment and the spray pipe segment. The regenerative cooling structure comprises multiple cooling channels. Hydrocarbon fuel cools the combustion chamber through the cooling channels first, and then enters the combustion chamber for combustion. By means of the regenerative cooling method and the cooling structure, the temperature of an engine body can be lowered greatly to be below the allowable temperature of an engine manufacturing material, thermal balance of a whole system can be realized quickly, and therefore the effect of long-time effective thermal protection of the subsonic velocity combustion ramjet combustion chamber is achieved; moreover, the fuel after absorbing heat is higher in combustion efficiency and sufficient in combustion, and therefore the thrust and endurance of a subsonic velocity combustion ramjet can be effectively increased.

The invention discloses a battery pack. The battery pack comprises a plurality of cells and a temperature regulating module, wherein the temperature regulating module comprises a first flow channel, a second flow channel, and a third flow channel communicated with each other; and the third flow channel is vertically arranged between adjacent cells. The battery pack provided by the invention has the advantages of low energy consumption, good internal thermal balance, uniform overall heat dissipation, simple structure, and the like, and can be widely used in the related fields of electric vehicles, energy storage power stations and the like.

The invention discloses a temperature control circuit and method and a charging system. The temperature control circuit comprises a judging unit, a calculating unit and a setting unit, wherein the judging unit is used for receiving the temperature value from a sensor and respectively comparing the temperature value with a thermal balance threshold value temperature, a maximum using temperature and a recovering temperature to obtain a corresponding judging result; the calculating unit is coupled with the calculating unit and is used for calculating the output power according to the judging result in real time; the setting unit is coupled with the calculating unit and is used for producing a voltage setting value corresponding to the output power and a current setting value corresponding to the output power and supplying the voltage setting value and the current setting value to a power module. According to the temperature control circuit and method and the charging system, the output power of the charging system can be adjusted flexibly, and therefore the charging efficiency is improved, and overheating of the charging system is avoided.

The invention provides a hydrogen gas sensor based on a thermal conduction principle. The sensor comprises the thermistor of a measuring cell, the thermistor of a reference cell, a bridge fixed resistor, a PCB board, a shell and an amplifying circuit, the top of the measuring cell is provided with a porous membrane or a reticular supporter, the reference cell is of a leak-proof structure, and hydrogen gas cannot infiltrate into the reference cell. The thermistor and the bridge resistor are respectively fixed on the upper and lower sides of the PCB board. The amplifying circuit is arranged at the bottom or outside the shell of the sensor. By optimizing the physical structure of the sensor, the invention realizes the self thermal balance of the sensor, inhibits the interference of an external environment, has small and compact structure, and is applicable to general on-site environment for a long time.

The invention provides a technical scheme of a thermal balance-based furnace temperature optimization method of a walking beam furnace. According to the scheme, the method is characterized in that on the premise that the requirements of steel blank rolling are met, set values of temperatures of different sections of the furnace are reduced to the greatest extent, then the fuel consumption is reduced, and the oxidation burning loss of steel blanks is reduced. According to the method, the heat balance relationship inside the furnace is utilized to establish relationship expression of the furnace temperature, the steel temperature, the heat supply amount and the heat loss, and optimal furnace temperatures of different sections along the length direction of the furnace are calculated according to the working conditions such as the furnace model, the steel blank specification, the types, the target discharge temperature, the feeding temperature and the rolling efficiency, so that the steel blanks are heated to be appropriate temperature and allowable cross section temperature difference within the fixed time, and the minimum energy is consumed.

The invention discloses a method for estimating generated heat of a lithium ion battery under conditions of charge and discharge, and the method comprises the steps: firstly collecting temperature data of a to-be-detected lithium ion battery under the conditions of electric heating and charge and discharge; secondly inputting the temperature data of the battery under different electric heating power into data processing software, and determining the relation equation between the heat loss power and temperature of a lithium ion battery thermal runaway testing and analysis system through employing a thermal balance integro-differential equation (1) and a thermal balance integro-differential equation (2); thirdly inputting the temperature data of the battery under the conditions of charge and discharge into the data processing software, inputting heat, generated within a certain time period, of the lithium ion battery into the data processing software according to the heat of the lithium ion battery, which is obtained by a thermal balance integro-differential equation (3) and is generated within a certain time period, in a process of charge or discharge, and obtaining a relation curve between the charge/discharge heating rate and time and the total generated heat in the process of charge or discharge. The method takes the whole lithium ion battery as a research object, and can obtain the impact on the battery from the charge and discharge conditions.

The present invention provides a battery module and a liquid-cooled battery system that uses it, a battery cell and a current collector sheet, on the premise that the materials like the electrode and separator and so on are completely the same, energy density of the battery pack is greatly increased; the cell and the current collector sheet are fully welded connections, the joints are fewer and it is not prone to produce desoldering, also ensuring the stability of the of the cell tab and high current carrying capacity, and when putting the parallel battery module in series, the use of wires are avoided, thus reduces the volume of the battery pack; the innovative design for the liquid-cooled battery pack system, improves the thermal balance between the cells, and the heat-dissipation in battery pack distributes more evenly, the insulation property of the battery package is highly improved, controlling the heat-dissipation capacity of the system by adjusting the flow rate of the circulating pump, not only the unnecessary energy consumption can be avoided, but also have a better impact resistance.

The invention relates to a non-splashing dynamically heating self-adaptive resistance welding method for automobile metal sheets, which comprises the following implementation steps: firstly, a nugget formation process is enabled to be kept in the state of non-splashing power-on heating fusion and cooling crystallization heat balance in the way that a non-secondary rectification welding transformer and a pulse width adjustable alternate current contravariant power supply are utilized and different metallic materials thermal balance factors are called; the nugget size is controlled through detecting the change rate of dynamic resistances at the two ends of electrodes. According to the invention, as a non-splashing thermal balance factor, namely t+t0, is adopted in the method, the splashing problem in the welding is effectively solved, and the welding quality is improved; the change rate of dynamic resistances at the two ends of the welding electrodes during the welding can be detected to quickly judge the nugget formation process, so that the interference in the measuring is reduced, and the reliability of the detection is improved; besides, the difficult problem that a plenty of splashes are generated in the welding of automobile metal sheets for a long time is effectively solved, the welding quality and the production efficiency are greatly improved, and the production and processing cost is greatly reduced.

The invention discloses a method for testing film thermal conductivity. The method comprises the steps that: (1) with a surface micromachining technology, a double-end support cantilever beam structure is prepared, wherein the double-end support cantilever beam structure is composed of a film to be tested, a metal resistor strip on the film to be tested, and supporting blocks positioned on two ends below the film to be tested; (2) a proper direct current I is applied on the metal resistor strip I, such that temperature increasing is formed on the double-end support cantilever beam through the heating effect of currents; and (3) when thermal balance is reached, stable temperature increasing distribution is formed on the double-end support cantilever beam; and thermal conductivity is calculated according to voltage change value delta U on two poles in the inner side of the metal resistor strip, or according to delta UTCR value. According to the invention, compared with a commonly used 3omega method film thermal performance test method, the test structure processing process and testing means of the one-dimensional cantilever beam direct current method are relatively simple, and assist in providing more precise results.

The invention is suitable for the field of mechanical transmission devices, in particular to the field of transmission devices for large-tonnage mining dump trucks with electric wheels, and provides a hub reductor for a mine electric drive heavy-duty car. The hub reductor is characterized by adopting three stages of planetary reducing mechanisms; the first-stage and the second-stage planetary reducing mechanisms are differential gear trains; the third-stage planetary reducing mechanism is an ordinary gear train; in first-stage transmission and second-stage transmission, sun gears are power input components, and planet carriers and gear rings are power output components; and in third-stage transmission, a sun gear is a power input component, a planet carrier is fixed, and a gear ring is a power output component. The invention has the benefits that the transmission ratio changes within a large range, so as to transmit even larger torque; one more stage of planetary reducing mechanism is adopted for providing driving torque required by driving the heavy duty car, so that the bending fatigue stress and the contact fatigue stress of a last stage gear are reduced, which ensures higher safety factor; and the axial space utilization rate of the whole hub reductor is improved while the radial space is fully used, so that the integral radiating area is enlarged to achieve integral thermal balance better.

The invention relates to a method for measuring plasma electron density by fiber spectrum synergizing discharge current, and belongs to the technical field of discharge plasma diagnosis. The method is technically characterized by comprising the following steps: using a micro fiber spectrum measuring path and a discharge current measuring circuit at the same time to acquire real-time parameters of optical radiation spectrum of discharge plasma and discharge current, comprehensively analyzing the parameters through a computer data processing system, and calculating the electron density of the plasma. The micro fiber spectrum measuring path consists of a fiber probe, a conducting fiber and a micro fiber spectrometer, which are connected in turn; the discharge current measuring circuit consists of a current sensor, a current signal amplifier and a data acquisition device, which are connected in turn; and the computer data processing system calculates the electron density of the discharge plasma by using the acquired data according to the gas molecule motion theory. The method has the advantage that the application range of the discharge plasma electron density diagnosed by optical emission spectrometry is expanded to an imbalance state from a local thermal balance state.

The invention discloses a quantitative modularized method for accurately controlling blow-in, banking and blow-out of a blast furnace. The blow-in method comprises the following steps: burdening, feeding calculation, charging for the blast furnace, adjustment of charging, feed-in calculation and blow-in control. The banking method comprises the following steps: canceling limestone, dolomite and silica in claims 1 to 6, adjusting a total coke ratio and a total alkalinity according to the banking time, stably descending furnace burden, and when the calculated furnace burden is fed into the furnace, and the burden line is about 6 cm of the stock level, damping down so as to finish banking. The blow-out method comprises the following steps: after furnace burden feeding is stopped, calculating the burning coke quantity based on feed-in air quantity of the blast furnace, when the volume vacated in the furnace is up to the predetermined cleared amount, combining with outer furnace observation and determination, and damping down so as to finish blow-out. The quantitative modularized method is based on the principles of local material balance of each part in the blast furnace, full-furnace material balance and thermal balance, solves the problems that the associated data such as the total coke ratio, the alkalinity balance at the filled part, final slag constituents, cast iron composition control, empty burden batches and normal burden batches are processed in an interacted manner, and has the characteristics of simplicity in method, and quickness and accuracy in control.

The invention discloses a Mars surface thermal environment simulation system. The Mars surface thermal environment simulation system includes a low pressure wind speed simulation system, a low pressure wind speed measurement system, a gas temperature control system, a gas pressure control system and a Mars rover attitude control system, wherein the low pressure wind speed simulation system utilizes a vacuum container to perform modification, adds an air channel, a fan, a flow deflector, a rectification net and other devices in the vacuum container, and employs the mode of direct current gas absorption to realize 0-20m/s uniform wind speed simulation. The Mars surface thermal environment simulation system completes low pressure wind thermal balance test of the Mars rover, completes the thermal design verification in the special environment, and can provide thermal test environment conditions for a detector or load of the Mars environment to perform the related test verification.