36 results about "Stagnation temperature" patented technology

A solar collector panel is disclosed for heating of air, in which the conventional insulation material on the back panel facing away from the sun is replaced by a spacing between a permeable back panel and a permeable heat absorber means, so that a heat convection airflow through the back panel and into the interior of the solar energy panel against the temperature gradient prevents the convection heat loss in the opposite direction. The back panel also reduces the radiation heat loss from the heat absorber means. Furthermore, in case the flow of air through the solar energy panel is stopped, the convection-insulation will no longer be effective, and a photovoltaic cell panel placed within the solar energy panel and generating electricity from the solar radiation will not be subjected to the damaging high stagnation temperature of a traditionally insulated solar collector panel.

The invention discloses a simulating experiment method of rock natural seepage ability, and the simulating experiment method comprises the following steps: properly preparing a dynamic high-temperature and high-pressure water rock simulation experiment set used in the simulating experiment method; placing a sample rock core column into a reaction kettle; injecting a prepared solution filled in a solution container into the reaction kettle via a transmission pump, performing rock core confining pressure and internal pressure control in the reaction kettle to keep the pressure of the sample rock core column to be consistent with that of a real formation; using a temperature control system to set reaction temperature, heating the reaction kettle; using a counterbalance valve for regulating the pressure of the reaction kettle to a formation pressure demanded by an experiment; after an experiment fluid flows out via the sample rock core column in the reaction kettle, recording liquid out-letting amount of an outlet liquid in even space to obtain the rock core column seepage ability, namely seepage velocity with the unit of ml/min; according to the rock core column seepage ability and an actual wellbore oil drainage area, extrapolating daily fluid production rate of every unit thickness per meter. The method can truly and directly reflect rock actual seepage ability, so that the purpose of effectiveness evaluation of a reservoir stratum can be achieved.

The invention relates to an intelligent dew removing device and an intelligent dew removing method for a glass door body of a wine cabinet. The glass door body can be intelligently heated by using the method or the wine cabinet provided with the device, and when temperature of the glass door body is higher than condensation stagnation temperature, heating automatically stops, and the wine cabinet automatically exits a dew removing program. Due to the fact that condensation can not be generated on the door body when the temperature of the door body is higher than the condensation stagnation temperature, the problem that the condensation can be generated on the glass door body can be fundamentally solved, and normal use of the wine cabinet can not be influenced, and furthermore energy consumption during the actual use process of the wine cabinet and life of a glass door are benefited.

The invention discloses a method for measuring a temperature in a vacuum environment based on a wavelength modulation spectrum technology, and belongs to the technical field of tunable laser diode absorption spectroscopy. According to the method, a laser is modulated by utilizing a high-frequency sine wave, a low-frequency triangular wave and a low-frequency square wave based on the wavelength modulation spectrum technology, so that selected two temperature measurement spectral lines appear at a high level position and a low level position respectively; spectral line scanning is realized by the triangular wave; the second harmonic signal ratio of the two spectral lines is obtained by experimental measurement; the rotational temperature of gas molecules is determined by comparing the second harmonic signal ratio with a theoretical calculating value; and the rotational temperature and a translational temperature (the classical thermodynamic temperature) are kept balance all the time, so that the temperature of gas can be measured. By the method, the problems of surface material analysis and temperature traceability of a current contact temperature sensor applied in the vacuum environment are solved.

The invention concerns a multilayer material comprising at least:

• • a support having a reflectance R higher than 80% for radiations of wavelengths higher than 5 μm,
  • a selective layer comprising a combination of Vanadium oxides VO₂ and VO₂O_2n+/−1, with n>1, said selective layer having an absorbance higher than 75% for radiations of wavelengths comprised between 0.4 and 2.5 μm, regardless of the temperature T, and having, for radiations of wavelengths comprised between 6 and 10 μm, a transmittance Tr such that:
    • Tr>85% for T<Tc, a critical temperature,
    • 20%≦Tr≦50% for T>Tc.

Application to the production of thermal solar panels having a low stagnation temperature and high performance.

The invention relates to a hybrid optical pumping-based accurate atomic density measurement method. The method comprises the steps of heating an alkali metal gas chamber filled with K and Rb up to starting temperature, and measuring to obtain laser absorption spectrums of the K and the Rb to obtain densities of the K and the Rb at the starting temperature, and associating Raoult's law to obtain the starting temperature as well as ratios of saturated vapor pressures to molar fractions of the K and the Rb at the starting temperature; heating the gas chamber up to working temperature, wherein the density of the Rb is very high and the absorption is very strong near a resonance point in an SERF state, carrying out curve fitting to obtain a greater deviation of the density of the Rb, and accordingly obtaining the density of the K by means of a spectral absorbing method; combining the known molar fraction of the K, and calculating to obtain the working temperature; combining the molar fraction of the Rb to obtain the saturated vapor pressure of the Rb at the working temperature, and further obtaining the density of the Rb at the working temperature. The hybrid optical pumping-based accurate atomic density measurement method is suitable for the situation that during hybrid optical pumping, the saturation absorption spectrum is very high in atomic number density and is very strong in absorption at the both sides of a resonant peak, so that the density is difficult to obtain by means of a fitted curve.

The invention provides a method for controlling a stagnation temperature of a solar vacuum tube. The method controls the stagnation temperature of the solar vacuum tube by changing emissivity of a back surface of a heat absorbing body of the solar vacuum tube. The inventive method can effectively control the stagnation temperature of a vacuum heat collecting tube, and make the stagnation temperature lower than a bearable set temperature of a solar vacuum heat collecting tube system, to thereby prolong the service life and lower manufacture cost of the system.

Engine has core compressor, combustor and turbine, fan located upstream of core and supersonic intake for slowing down incoming air at inlet formed by intake, bypass duct surrounding engine core, fan generates airflow to engine core and bypass airflow through bypass duct. Engine has mixer for exhaust gas flow exiting engine core, bypass airflow exiting bypass duct, thrust nozzle for discharging mixed flows, and controller for thrust produced by engine. To change level of engine thrust between transonic push operation and supersonic cruise operation, controller adjusts one or more components which vary relative areas available for hot exhaust gas flow and cold bypass airflow at mixer while holding fan inlet non-dimensional mass flow w √{square root over ( )} T/P substantially constant, where w is mass flow of incoming air at fan inlet, T is stagnation temperature of incoming air at fan inlet and P is stagnation pressure of incoming air at fan inlet.

A lightweight flexible BNNT mat or fabric provides improved thermal stability and shielding capabilities under a hypersonic thermal flux. The BNNT mat reduces the stagnation temperature and maintains a low regression rate. An in-situ passivation layer may be formed on the BNNT mat or fabric under high thermal flux. The passivation layer minimizes or prevents penetration of the atmosphere (air or gas) as well as heat and radiation through the thickness of the BNNT material, and it effectively diffuses heat throughout the mat or fabric laterally and radially to minimize localized excessive heat. A BNNT mat according to the present disclosure may also efficiently transfer heat from the BNNT material via radiation due to the high thermal emissivity (0.92) of the BNNT material.

The invention discloses a total temperature probe device with high precision and low self-loss. The total temperature probe device is installed at the leading edge of a rotating mechanical blade of anaerospace vehicle and comprises a probe body, wherein the probe body is defined with two layers of chambers, which are respectively recorded as a stagnation layer and a heat insulation layer; the heat insulation layer is sleeved outside the stagnation layer, the stagnation layer contains a temperature sensor, a first through hole is defined between the stagnation layer and the heat insulation layer, and a second through hole is defined at the bottom of the heat insulation layer in the direction of the blade pitch. The purpose of the total temperature measuring device provided by the inventionis to accurately measure the stagnation temperature of the leading edge of the blade, reduce the loss caused by the temperature measuring device, and obtain a more accurate total temperature measurement when the influence on the original flow field is as small as possible.

A method of thermodynamic assessment of flow through a turbomachine having a compressor, comprising: receiving sensor readings from a plurality of acoustic sensors located about an intake for the turbomachine upstream of the compressor; and receiving pressure and stagnation temperature readings for the flow into the intake. A static temperature is determined for the flow into the intake and an average velocity of the flow over a flow area of the intake upstream of the compressor using the acoustic sensor readings. A mass flow rate of the flow through the intake is determined using the average velocity of the flow and the stagnation pressure.

The invention relates to a damp removal and straightening experimental method for damp solid cables. The method comprises the following steps: 1) the damp solid cables to be detected and brand new solid cables as straightening standard are pre-treated, so that main insulation layers are exposed on the surfaces of the solid cables as measurement sections; 2) the electric conductivities of the measurement sections on the damp solid cables to be detected and the brand new solid cables are measured respectively; 3) the damp solid cables to be detected are heated with constant temperature under different temperatures, and the electric conductivities of the measurement sections are detected in a real-time manner in the heating process; and 4) the electric conductivities obtained in a real-time manner are compared with that of the measurement sections on the brand new solid cables to obtain the optimal damp removal and straightening temperature and time. Compared with the prior art, the method can quickly and accurately determine the optimal damp removal and straightening temperature and time for the damp solid cables.

The invention relates to a high-emissivity low-stagnation-temperature all-glass evacuated collector tube. The all-glass evacuated collector tube is made by concentrically connecting a cover glass tube 1 with an inner glass tube 2 to form a jacket and vacuumizing the jacket to form a vacuum heat-insulating layer 3. Ashady face of the outer surface of the inner glass tube 2 comprises an uncoated area 4 provided with a circumferential angle of about 140 degrees and represented by double lines. A film is deposited on the sunny face of the inner glass tube 2. The inner glass tube 2 extends outwards by a section and is sealed to make a heat tube. As shown in figure 1, a working principle is characterized in that sunlight penetrates the cover glass tube 1 to be converted into heat energy on the film of the inner glass tube 2, and the heat energy is outputted through a cold end 5; during normal heat collecting, heat energy radiated through the uncoated area 4 is little; during stagnation, the surface temperature of the inner glass tube 2 is very high, heat energy radiated through the uncoated area 4, with emissivity of 92%, namely, the surface of the inner glass tube 2 is increased, excessive rising of the stagnation temperature is limited, and steam pressure inside the heat tube cannot be too high.

The invention provides a manufacturing method of dried basil, and relates to the technical field of food processing. The manufacturing method comprises the following steps: (1) picking fresh and high-quality basils as the raw material, washing basils, and draining; (2) degrading the water on the surface layer of basils for 6 hours in a room with a constant temperature of 42 to 45 DEG C; (3) carrying out dehydration by a dehydrating machine for 45 minutes under a rotation speed of 220 r/min, and then degrading water for the second time; (4) putting the basils into the room with a constant temperature, adjusting the temperature to 32-35 DEG C, and then degrading water for the third time for 12 hours; (5) fixing color and morphology of basils at a constant temperature of 60 DEG C, and degrading the water of basils until the water content reaches 60%; (6) quantitatively packing basils into vacuum bags, storing the products in a freezing chamber with a temperature lower than 0 DEG C, and delivering the products to all parts of the country. The shelf life of basil is largely prolonged, fresh basil can be stored for only three days, the processed basil can be stored for one year or more, moreover, the fragrance is preserved, and the basils will not be crushed or broken.

The invention discloses an aircraft standing point temperature calculation method based on two-dimensional search. A look-up table is established; a gamma-T curve is fitted out; the gamma-T curve is converted into the look-up table, and the temperature value T is used as a searching condition, and a corresponding air specific heat capacity ratio gammaT can be found out; the standing point temperature value when V=5Ma is calculated, according to the temperature value, a gamma value is selected, the standing point temperature is repeatedly calculated, and the gamma initial value is determined; the air specific heat capacity ratios gammai and gammaj are calculated; the flight speed V and the height H are used as conditions, the air specific heat capacity ratio gamma is searched in the two-dimensional look-up table, the aircraft standing point temperature T at the corresponding speed and height is calculated, and finally, when the height is within 20-70 km and the speed is within 5-22 Ma,the aircraft standing point temperature can be obtained. The problems that in the prior art, the aircraft standing point temperature is not accurate and calculation is discontinuous are solved.

In the graph 1, a cover glass tube (1) and an inner glass tube (2) are in sealed connection in a concentric mode to form a full-glass vacuum heat collection element changing the vacuum degree for stagnation protection. On the non-light-facing face of an area, with the angle of circumference being 140 degrees, of the inner glass tube (2), a steel wire snap spring is connected with an activated carbon fiber adsorbing material (4) in a low heat resistance mode, a fusion-sealing position of the inner glass tube (2) extends outwards by a section and then is sealed, vacuum pumping is conducted on the interior of the inner glass tube (2), working media are poured into the inner glass tube (2), and the inner glass tube (2) is sealed to be made into a heat tube. According to the working principle of the embodiment of the graph 1, sunlight penetrates through the cover glass tube (1) and is converted into heat energy on a film layer of the inner glass tube (2), and the heat energy is output through a cold end (5). When heat is collected normally, the temperature of the surface of the inner glass tube (2) is no more than 90 DEG C, and the adsorbing material cannot be desorbed. When stagnation is conducted, the temperature of the surface of the inner glass tube (2) is high, and the vacuum degree of a vacuum heat insulating layer (3) declines as the adsorbing material is desorbed and emits gas. The inner glass tube (2) releases partial heat energy to the environment through gas in the vacuum heat insulating layer (3), and excessive rising of the stagnation temperature is limited.