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Performance Evaluation of Short Parabolic Trough Collectors Integrated with a Small-Scale Solar Power and Heating System
摘要： An investigation is presented on the performance of a small-scale solar power and heating system with short parabolic trough collectors (PTCs). The steady-state model of the short PTCs is evaluated with outside experiments. The model mainly contains the heat loss of the receiver, the peak optical efficiency and the incident angle factor consisting of incident angle modifier and end loss. It is found that the end loss effect is essential in this model when the length of the PTCs is less than 48 m, especially in the winter. The standard deviation of the steady-state model is 1.4%. Moreover, the potential energy efficiency ratio of the solar power and heating system is considerably larger than the coefficient of performance (COP) of general air-source heat pumps, and increases with the decrease of the condensation temperature. An overall system efficiency of 49% can be reached. Lastly, the existence of a water storage tank improves the flexibility of heating the building, and the volume of the water storage tank decreases with the increase of the heating water temperature.
关键词： practical operating characteristics,parabolic trough solar collector,thermal performance,testing method,small-scale
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 27th Asian Test Symposium (ATS) - Hefei, China (2018.10.15-2018.10.18)] 2018 IEEE 27th Asian Test Symposium (ATS) - Highly Efficient Waveform Acquisition Condition in Equivalent-Time Sampling System
摘要： This paper describes the optimal waveform acquisition condition between the measured waveform repetitive frequency (fsig) and the sampling clock frequency (fCLK) in an equivalent-time sampling system, when the measured waveform is periodic. We have obtained that in the case of fCLK / fsig = 1.6180.. or the golden ratio, a waveform missing phenomenon for the equivalent-time sampling can be avoided and highly efficient waveform acquisition sampling can be realized. We consider that this can be explained using the relationship to the golden section search algorithm. This paper presents theoretical consideration and simulation results, and we consider that these results can be utilized in several LSI testing applications such as an ADC histogram testing method using a sine wave input and a timing measurement circuit design besides the equivalent-time sampling system.
关键词： golden ratio,sampling oscilloscope,waveform missing,ADC histogram testing method,golden section search,equivalent-time sampling
更新于2025-09-04 15:30:14