An energy model of heat pump systems for hot water assisted by PV/T solar energy in climates above 15°C

Juan Garcia Pabon, Ali Khosravi*, Mamdouh El Haj Assad

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review


In this work, a mathematical model is used to calculate the energy efficiency of a heat pump that uses solar thermal energy from a aphotovoltaic panel. The city of Itajubá in the Brazilian state of Minas Gerais is the target of the case study. When compared to the performance of the equipment individually, the advantages of producing hot water and electricity simultaneously include maximizing the use of physical space and obtaining superior energy efficiency (photovoltaic panel and solar thermal collector). The system will be simulated using MATLAB software. The mathematical model of the photovoltaic-thermal system (PV/T) includes a set of 4 unknown variables that must be solved simultaneously: temperature of the PV panel, evaporator, condenser, and water in the tank. The compressor has a displacement volume of 1.2 m3/h and a volumetric and isentropic efficiency of 0.6 and 0.5, respectively. The condenser is a copper tube with a 10m length and 10mm diameter that is submerged in a water tank. The findings show that on a winter day, 300L of water could be heated from 16°C to 45°C using a 2.4m2 PV panel while simultaneously producing 1.3 kWh of power. For comparison terms, a conventional solar collector would need more than twice the area to achieve the same level of water production.

Original languageEnglish
Title of host publicationThe Fundamentals of Thermal Analysis
EditorsMamdouh El Haj Assad, Ali Khosravi, Mehran Hashemian
PublisherNova Science Publishers
Publication date20. Jul 2023
ISBN (Print)9798886977592
ISBN (Electronic)9798886978759
Publication statusPublished - 20. Jul 2023


  • Heat pump
  • PV/T system
  • Solar energy
  • Water heating


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