研究目的
To evaluate the performance of a small-scale solar power and heating system with short parabolic trough collectors (PTCs) using a steady-state model based on outside experiments, and to investigate its efficiency and practical characteristics.
研究成果
The steady-state model effectively predicts the thermal efficiency of short PTCs with a standard deviation of 1.4%. The system achieves an overall efficiency of up to 49%, with the potential energy efficiency ratio exceeding that of air-source heat pumps. End loss is significant for PTCs shorter than 48 m, and the use of a water storage tank enhances heating flexibility.
研究不足
The study is limited to specific weather conditions in western China and may not be generalizable to other regions. The model assumes steady-state conditions and neglects some heat losses and pressure drops, which could affect accuracy. The PTC length recommendation is based on focal distance and may vary with design.
1：Experimental Design and Method Selection:
A steady-state model of short PTCs was developed and evaluated through outdoor experiments, focusing on heat loss, peak optical efficiency, and incident angle factor. The model was verified by comparing calculated and experimental thermal efficiencies.
2：Sample Selection and Data Sources:
Experiments were conducted in Xining city, China, using a PTC system with specific characteristics. Weather data were sourced from Meteonorm for simulations.
3：List of Experimental Equipment and Materials:
Equipment included Pt100 resistance temperature detectors, a vortex-type flow meter, a pyrheliometer, thermal storage tanks, expansion vessels, and electrical heaters. Materials included synthetic oil as the heat transfer fluid and cyclohexane as the working fluid.
4：Experimental Procedures and Operational Workflow:
Tests involved heating HTF to high temperatures, measuring temperatures and flow rates under controlled conditions (e.g., solar irradiance >800 W/m2, ambient temperature <30°C, wind velocity 2.0-4.0 m/s), and performing heat loss and optical efficiency measurements at specific times.
5：0-0 m/s), and performing heat loss and optical efficiency measurements at specific times.
Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using uncertainty analysis with coverage factor k=2, standard deviation calculations, and curve-fitting for parameters like heat loss and incident angle modifier. Simulations were conducted using the TRNSYS platform.
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