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Assessment of Daily Efficiency of Flat-Plate Solar Collectors in Impulse Mode

Sh. I. KlichevScientific and Technical Center with a Design Bureau and Experimental Production, Academy of Sciences of the Republic of Uzbekistan, 100125, Tashkent, UzbekistanS. A. BakhramovScientific and Technical Center with a Design Bureau and Experimental Production, Academy of Sciences of the Republic of Uzbekistan, 100125, Tashkent, UzbekistanY. K. RashidovTashkent University of Architecture and Civil Engineering, 100194, Tashkent, UzbekistanSh. Yu. SultanovaTashkent University of Architecture and Civil Engineering, 100194, Tashkent, Uzbekistan

2026en

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ABI

Annotatsiya

Abstract The daily performance and efficiency of a horizontally positioned flat-plate solar collector (FPSC) in pulsed mode, periodic filling and draining of the coolant upon reaching a predetermined average temperature, are examined. A one-dimensional non-stationary numerical thermal model and calculation program were developed, taking into account the FPSC’s key parameters, variations in solar radiation level, and outdoor air temperature. Its daily efficiency and performance were estimated at various hot water heat removal temperatures in summer. The obtained data can be used, as a first approximation, to estimate the FPSC’s daily efficiency and performance in normal operation. The FPSC’s pulsed mode of operation is of independent importance and allows for simplification of the receiver design, reducing the number of channels and eliminating the requirement for low velocities and uniform coolant flow within the FPSC.

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DOI: 10.3103/s0003701x2660058x

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