Determination of the Convective Heat-Exchange Coefficient in Inner Channels of Light-Absorbing Heat-Exchange Panels of Flat-Plate Solar Water-Heating Collectors Based on the Results of Their Short-Term Thermal Testing in Full-Scale Conditions

The results of investigations to determine the convective heat-exchange coefficient in the inner heat-exchange channels (HECs) of the light-absorbing heat-exchange panels (LAHPs) of flat-plate solar water-heating collectors (FPSWHCs) are given based on the results of their short-term heat testing in...

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Bibliographic Details
Published in:Applied solar energy 2018, Vol.54 (1), p.10-16
Main Authors: Avezov, R. R., Avezova, N. R., Rakhimov, E. Yu, Vokhidov, A. U.
Format: Article
Language:English
Subjects:
Accumulators
Channels
Coefficients
Collectors
Electrical Machines and Networks
ENGINEERING
HEAT
Heat exchange
Heat exchangers
Heat transfer
Heating
Panels
Photovoltaic cells
Plates (structural members)
Power Electronics
RELIABILITY
Reliability aspects
SOLAR ENERGY
Solar Power Plants and Their Application
SOLAR WATER HEATING
THERMAL EFFICIENCY
THERMAL TESTING
VISIBLE RADIATION
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Summary:The results of investigations to determine the convective heat-exchange coefficient in the inner heat-exchange channels (HECs) of the light-absorbing heat-exchange panels (LAHPs) of flat-plate solar water-heating collectors (FPSWHCs) are given based on the results of their short-term heat testing in fullscale quasi-stationary conditions. The research method is based on determining the value of the required parameter from the heat-balance equation formed for the inner surfaces of the LAHP HEC walls. The structures of the flow LAHPs with a sheet-piped and thin parallelepiped form are selected as the test objects. The thermal tests of the FPSWHC are carried out during the near-midday hours of the light day to ensure the quasi-stationary mode condition. The reliability of the proposed method and results of the investigations is proved by comparing the values of the thermal-efficiency coefficients of the FPSWHC LAHPs obtained using two independent approaches.
ISSN:0003-701X
1934-9424
1934-9424
DOI:10.3103/S0003701X18010036