In order to study the winter operation performance of micro heat pipe PV/T with different cross section in cold areas, two groups of MHP-PV/T systems are tested under 45° sloped angle. The photoelectric, photothermal and comprehensive performances of the system from January 1 to 2, 2022 are compared and analyzed. The results show that： under the condition of outdoor average ambient temperature of 0.5 ℃, the rectangular cross section MHP-PV/T （R-MHP-PV/T） system average photoelectric efficiency is 12.1%, photoelectric power is 140.6 W, photothermal efficiency is 12.2%, photothermal power is 161.7 W, total power is 321.1 W, total energy efficiency is 24.6%, the total revenue for is 2.31 kWh. The trapezoidal cross section MHP-PV/T（T-MHP-PV/T） system average photoelectric efficiency is 12.0%, photoelectric power is 140.4 W, photothermal efficiency is about 8.6%, photothermal power is 114.6 W, total power is 278.4 W, total energy efficiency is about 20.9%, the total revenue is 2.11 kWh. The MHP-PV/T system with rectangular and trapezoidal cross section filled with working medium R141b and liquid filling rate of 25% can be started and work normally outdoors in cold areas in winter. The comprehensive performance of R-MHP-PV/T system is better than that of T-MHP-PV/T system.
Key words
solar energy /
photovoltaic/thermal /
thermoelectric performance /
heat pipe /
experimental research
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