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Study of operation performance for a solar photovoltaic system assisted cooling by ground heat exchangers in arid climate, China
摘要： Photovoltaic power generation application with advantages of sustainability and low emission is limited on its low photovoltaic (PV) efficiency mainly due to high panel temperature. In this paper, a solar photovoltaic system coupled by ground heat exchangers (PV-GHEs system) is proposed to reduce the operation temperature of panels and keep a high PV efficiency. Taking Tikanlik with typical arid climate of northwestern China as an example, a numerical model based on the software TRNSYS is built and its reliability are validated based on an actual thermal response test data. The simulation results show that the PV-GHEs system can reduce the panel temperature by 26.8% and increase the annual electricity yield by 7.9%, compared with conventional PV systems. Sensitivity analysis highlights the influences of environmental, geological and design parameters on the system performance. For the long-term operation, a gradually growing ground temperature is unfavorable and may weaken the heat transfer between GHEs and the surrounding ground. For the case of Tikanlik, the growing rate of the ground temperature is 0.67 (cid:1)C per year and a minimum distance of 10 m between boreholes is recommended when more GHEs are needed. Finally, a life cycle cost analysis of the PV-GHEs system is investigated.
关键词： Panel temperature,PV efficiency,Long-term performance,Ground heat exchangers,Photovoltaic system
更新于2025-09-19 17:13:59
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Long Term Electrical Rating of Concentrated Photovoltaic (CPV) Systems in Singapore
摘要： Owing to the diverse photovoltaic (PV) systems available commercially, ranging from the stationary silicon-based PV panels to 2-axes tracker concentrated photovoltaic (CPV) systems and dynamic nature of meteorological data, energy planners and PV system designer require a simple but accurate methodology to understand the economic viability of a renewable solar PV plant. An electrical rating methodology is proposed for evaluating the long-term performance for assorted PV systems, providing a common “playing field” to consumers, planners and manufacturers of PV systems. Given a meteorological condition, the output-based approach or electrical rating of renewable energy system is the key for economic and environmental CO2 emission evaluations. Despite the overwhelming catalog data furnished by PV manufacturers, the long-term electricity rating of a PV system is deemed to be a quick and accurate method for the evaluation of economic viability and the determination of plant sizes and power production from a PV facility. This paper presents and analyses the long term performances, as monthly and overall electrical ratings in kWh/m2.year of two concentrated photovoltaic (CPV) prototypes, the mini dish Cassegrain-type and the Fresnel lens CPVs with triple-junction solar cells, operating under the meteorological conditions of Singapore and compares performances with the other photovoltaic systems.
关键词： Concentrated Photovoltaic,Long Term Performance,CPV,Electrical Rating,Solar Tracker
更新于2025-09-12 10:27:22