32 results about "Pyranometer" patented technology

The invention relates to a calibration device and a calibration method used for an indoor pyranometer. A supporting pillar and a positioning pillar are arranged on left and right surfaces of a rotating crossbeam respectively, and a rotating shaft is fixed in a bearing in a shaft core and is movably connected with a fixed shaft; a light shield is fixed at the bottom end of a light shield disc, theupper end surface of the light shield disc is fixed with a crossbeam of a photochopper, the crossbeam of the photochopper is placed in a U-shaped mouth on an upright shaft of the photochopper and is connected with the upright shaft of the photochopper through a pin shaft; and the upright shaft of the photochopper is fixed on a worktable board, a turn table is fixed on the worktable board, the crossbeam of the photochopper is rotated clockwise to enable the light shield of the photochopper to be placed above the turn table, a light source support is fixed on the rear end surface of the worktable, an irradiation light is movably connected on the light source support, and the distance between the irradiation light and the worktable board can be adjusted. The method is characterized in that the calibration can be performed indoor at any time, and is not limited or influenced by weather; the light source is stable, the calibration time is short, and the stability is high; and the use is convenient, the efficiency is higher, and the data reliability is high.

A shadow band assembly includes a platform and an arcuate shadow arm extending upward from the platform and terminating in a free end above the platform. A sun sensor mounting location is located below the free end of the shadow arm. The arm is preferably further supported by a vertical strut. According to other embodiments, the arm is hollow and contains a fluid conduit and / or an electrical cable. A sun sensor may be mounted on top of the free end of the arm and a fluid nozzle may be mounted under the free end. A shadow band pyranometer includes the shadow band assembly, a sun sensor mounted at the mounting location and a motor drive coupled to the platform for azimuth tracking Additional sensors with zenith tracking may also be provided.

The invention relates to a method for evaluating the thermoelectric performance of a low-power concentrating photovoltaic-thermal system, a single reflection compound parabolic concentrator can collect solar scattered radiation with the efficiency of a geometric concentrating ratio reciprocal thereof in allusion to a low concentrating ratio range with the geometric concentrating ratio being less than 10*, the product of the geometric concentrating ratio reciprocal of the single reflection compound parabolic concentrator and the solar scattered irradiance is introduced into an electrical performance evaluation system, thereby realizing more accurate evaluation for the electrical performance of a device. In addition, a solar pyranometer and a scattered radiometer are installed in the device, and follow a tracking strategy of the device. Thermoelectric performance evaluation can also be realized for devices with a single-axis and double-axis tracking strategy accurately because the cosine loss is very small.

The invention discloses a vanadium dioxide-based sunshine intensity meter, which comprises an incident window, a cooling fin, a filter, a vanadium dioxide thin film, a digital measurement correction circuit, an output interface and a shell, wherein the incident window is arranged at the top end of the shell; the cooling fin is arranged below the incident window inside the shell; the filter is arranged below the cooling fin; the vanadium dioxide thin film is arranged below the filter; after sunshine enters from the incident window, light irradiates on the vanadium dioxide thin film sequentially via the cooling fin and the filter; after light-heat-resistance conversion is carried out on light via the vanadium dioxide thin film, output signals of the vanadium dioxide thin film are processed via the digital measurement correction circuit and are outputted via the output interface; and the vanadium dioxide thin film, the digital measurement correction circuit and the output interface are all arranged inside eth shell. The purposes of low cost, high sensitivity and high precision are achieved.

In a device for indoor testing of pyrheliometers and an optical axis alignment method thereof, the indoor testing device mainly includes a concentrating system, a xenon lamp, a steering plane reflector I, an optical integrator, a collimating system, a laser, a collimating expander Beam system, steering plane mirror II and adjustment mechanism. When in use, first ensure that the optical axis of the indoor test device is aligned with the optical axis of the pyrheliometer to be tested; then move the laser and the collimator beam expander out of the device; finally light the xenon lamp, and the beams emitted by the xenon lamp pass through the focusing system, Steering plane mirror Ⅰ, optical integrator, collimation system and steering plane mirror Ⅱ, with a beam with irradiance better than 1353W / ㎡, uniformity better than 0.5%, collimation angle less than 1°, and beam aperture greater than 60mm Projected to the measured direct radiation, thereby realizing the indoor test work of the measured direct radiation.

The invention discloses a method and device for measuring material surface reflectivity. The method comprises arranging a pyranometer for receiving sunlight incident quantity Ii and reflection quantity Ir above a material to be detected, recording a vertical distance h between the lower dome of the pyranometer and the material to be detected, arranging a lampshade at the lower dome of the pyranometer, arranging a LED light in the center of the lower dome, turning on the LED light to adjust the size of a reflection aperture of the pyranometer, determining the radius R of the reflection aperture, turning off the LED light, recording sunlight incident quantity Ii, sunlight reflection quantity Ir and a reflection coefficient F, calculating a pavement relative emission rate Rho and calculating reflectivity. The method and device can fast detect reflectivity and save a time cost.

The present invention discloses a loading device for thermal performance detection of a solar energy air collector. A rotation assembly is provided with a solar energy air collector, and an inlet detection assembly and an outlet detection assembly are respectively connected at two ends of the solar energy air collector; shaft sleeves are fixedly arranged at the bottom surface at the center of a rotation frame in the central axis direction at intervals, a bearing pedestal is installed at the top of a triangle support, a pallet is arranged at the side of the triangle support, and a motor is fixedly installed at the top of the triangle support; and a transmission bar is connected with a first motor and is connected with the bearing pedestal after passing through the shaft sleeves, the solar energy air collector is fixedly installed on the rotation frame, and the inlet detection assembly and the outlet detection assembly are respectively connected at two ends of the header in the solar energy air collector. The loading device for thermal performance detection of a solar energy air collector is able to load a solar energy panel air collector and single-branch, single-row and dual-row solar energy vacuum tube collectors, so that the practicality is improved to facilitate adjusting angles; and sun cloth is configured to automatically shield the solar energy air collector, and the loading device for thermal performance detection of a solar energy air collector is internally provided with an anemobiagraphm, a total pyranometer and a shelter.

The calibration device for photoelectric sunshine meters relates to the technical field of meteorological instrument detection, and solves the problem that the existing sunshine meters cannot work continuously outdoors for a long time, and the test data is discontinuous and the test time is long, resulting in low calibration efficiency; and the existing Most indoor calibration devices do not simulate the radiation environment, which reduces the measurement accuracy of the pyranometer, including fixed brackets, solar simulators, solar-terrestrial motion simulation institutions, and radiation environment simulation rooms. The solar simulator is fastened on the fixed bracket, and the collimated light beam emitted is reflected by the plane mirror to the photoelectric helium meter to be tested, and the helium meter to be tested is clamped on the high-precision optical rotating platform by the fixture to realize the adjustment of the altitude angle and the azimuth angle , to simulate different irradiation angles of the sun; through the radiation environment simulation room, simulate the influence of different air temperature, humidity and air quality on the radiation effect under the solar radiation environment. The invention reduces the workload of operators and improves the calibration efficiency.

A sky luminance mapping system includes a camera unit, two pyranometer units and a processing unit. Camera unit includes a fisheye lens to shoot image of sky dome and is equipped with light-shading devices which block the sun from the camera unit corresponding to instant location of the sun at instant time. First pyranometer unit measures daylight illuminance from the sky dome and outputs first intensity signal while the light-shading device is applied to block the sun. Second pyranometer unit measures daylight illuminance from the sky dome and outputs second intensity signal without blocking the sun. A reference intensity value is obtained by subtracting a value of the first intensity signal from a value of the second intensity signal. According to the value of the first intensity signal and the reference intensity value, a total luminance of and the luminance distribution in the image of the sky dome are corrected.

The invention provides a light transmitting envelop enclosure solar heat gain coefficient detecting device which comprises a solar pyranometer, an outdoor air temperature sensor, a heat metering box,a temperature control system and a data processing system. The temperature control system comprises an indoor temperature sensor, a heat collector, a refrigerating system, a first heater, a fan and atemperature control module, the temperature control module controls the refrigerating system, the first heater and the fan to run according to comparison judgment of data collected by the indoor temperature sensor and the preset temperature, the temperature control module further comprises a preset temperature changing unit, the detecting device further comprises a temperature compensation system,the temperature compensation system comprises a second heater and a temperature compensation control module, and the temperature compensation control module is connected with the outdoor air temperature sensor. By means of the device, the collected data have persistence and consistency, and the stability and the accuracy of the detecting device are effectively improved.