Performance Assessment of a Hybrid Photovoltaic-Thermal and Heat Pump System for Solar Heating and Electricity

Mustapha Obalanlege, Yasser Mahmoudi*, Roy Douglas, Ehsan Ebrahimnia-Bajestan, John Davidson, David Bailie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)
588 Downloads (Pure)


This work investigates a solar combined heat and power systems based on hybrid
photovoltaic-thermal heat pump systems for the simultaneous provision of space
heating and electricity to residential homes. The analysed system connects a
photovoltaic-thermal (PVT) panel, through a PVT water tank, to a heat pump. The
study is based on quasi-steady state heat transfer and thermodynamic analysis that takes incremental time steps to solve for the fluids temperature changes from the heat pump and the solar PVT panels. The effects of solar irradiance, size of the water tank and the water flow rate in the PVT pipes (laminar and turbulent) on the performance of the system are analysed. Particular focus is made towards the efficiency (electrical and thermal) of the PVT and the COP of the heat pump. Results show that the minimum COP of the heat pump is 4.2, showing the high performance of the proposed hybrid system. Increasing the water flowrate through the PVT panel from 3L/min (laminar) to 17L/min (turbulent) increases the PVT’s total efficiency (electrical + thermal) from 61% to 64.5%. Increasing the size of the PVT water tank from 1L to 100L, increases the total efficiency of the PVT panel by 6.5%.
Original languageEnglish
Pages (from-to)558-572
Number of pages15
JournalRenewable Energy
Early online date18 Oct 2019
Publication statusPublished - Apr 2020


  • solar photovoltaic-thermal; heat pump; hybrid system; quasi-steady state

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment


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