Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7938095 | Solar Energy | 2015 | 8 Pages |
Abstract
The time-resolved spectra of the irradiation emitted from solar simulators employing the two types of high-intensity discharge arc lamps that are commonly used in solar simulators, i.e. metal halide (here 6Â kW) and xenon arc (here 5Â kW) lamps, are reported. The lamp emission was recorded by a fast-response photodiode, which reveals that the amplitude of oscillating irradiation intensity from the metal halide lamp is approximately 60% of the peak intensity, while its oscillation frequency is twice of the frequency of the AC power supply, here 100Â Hz. The irradiation of the xenon arc lamp is powered by a modulated DC supply to oscillate at 300Â Hz, with an amplitude that is found to be only approximately 9% that of the peak intensity. An intensified CCD camera, which was coupled with a spectrometer operating in a range of 350-900Â nm, was synchronized with the lamp to provide phase-resolved spectra. The irradiation from the xenon arc lamp was found to be spectrally stable with time; while that from the metal halide lamp varies significantly throughout oscillation cycle, especially at the shorter-wavelengths of below 550Â nm. All spectra were calibrated to reveal that the time-averaged spectrum of the simulator with a metal halide lamp matches the solar spectrum significantly better than does that from a xenon arc lamp. The reflecting surface of polished ellipsoidal reflector was found to reduce the intensity of selected frequency bands by up to 10%, while that from both the polished ellipsoidal reflector and conical concentrator was found to reduce the intensity in selected frequency bands by up to 20%.
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Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Xue Dong, Zhiwei Sun, Graham J. Nathan, Peter J. Ashman, Dahe Gu,