Performance assessment of PVT-air collector with V-groove absorber: A theoretical and experimental analysis
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ORIGINAL
Performance assessment of PVT-air collector with V-groove absorber: A theoretical and experimental analysis Sourav Diwania 1 & Anwar S. Siddiqui 1 & Sanjay Agrawal 2 & Rajeev Kumar 1,3 Received: 10 July 2020 / Accepted: 1 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, the performance of a PVT (photovoltaic thermal) air collector with V-groove absorber in the air channel is theoretically and experimentally examined under different climate conditions of Ghaziabad city, India, in summer, June 2019. A low power brushless DC fan is fixed at the input of the air-channel to ensure the circulation of air through the V-groove. The energy balance equation is developed with the matrix-inversion method to estimate the PV (photovoltaic) cell and air output temperatures. The theoretical results obtained using mathematical modeling has been compared with that of the real-time experimental results. The electrical, thermal, and overall efficiencies for the theoretical and experimental studies are found in the range of 10.39–10.26%, 41.78–41.57%, and 52.17–51.81%, respectively. It has been observed that the theoretical results are coherent with experimental results for the proposed model achieving an accuracy of 98.98%, 99.43%, and 99.31% for electrical, thermal, and overall efficiencies, respectively. Keywords PVT air-collector . Exergy . Electrical and thermal efficiency . V-groove
Nomenclature Ac Collector area (m2) Ht Collector top loss coefficient (W/m2 oC) Hb Collector back loss coefficient (W/m2 oC) Tc Cell temperature (oC) d Channel depth (m) Dc Equivalence diameter of channel (m) Exin Exergy input Exout Exergy output Tf Fluid Temperature (oC) m Mass flow rate (kg/s) Am Module area (m2) Nu Nusselt number Pr Prandtl number
* Rajeev Kumar [email protected] 1
Department of Electrical Engineering, Jamia Millia Islamia, New Delhi, India
2
School of Engineering and Technology, IGNOU, New Delhi, India
3
Department of Electrical and Electronics Engineering, Krishna Institute of Engineering and Technology, Ghaziabad, India
Re I Cf Tin Tout Tsun k Qt W
Reynolds number Solar radiation (W/m2) Specific heat (J/kg oC) Temperature at the channel inlet (oC) Temperature at the channel output (oC) Temperature of the sun (oC) Thermal conductivity (W/m oC) Usable heat (W) Width of the channel (m)
Abbreviations PV Photovoltaic PVT Photovoltaic Thermal HTC Heat transfer coefficients Greek symbols α Absorption coefficient ρ Air density (kg/m3) ϵp Emissivity of PV ɳele Electrical efficiency,% ɳEx Exergy efficiency, % ɳoverall Overall efficiency, % σ Stefan Boltzman constant β0 Temperature coefficient of efficiency µ Viscosity (kg/ms) ɳth Thermal efficiency, % τ Transmission coefficient
Heat Mass Transfer
Subscripts a ambient b backplate f fluid p photovoltaic r radiative s sky w wind
1 Introduction The growth trajectory of any developing country cannot be projected without studying the rise in its electricity requirements. India’s story of development is no more diff
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