Multi-Source Heat Pump Coupled with a Photovoltaic Thermal (Pvt) Hybrid Solar Collectors Technology: A Case Study in Residential Application

Multi-Source Heat Pump Coupled with a Photovoltaic Thermal (Pvt) Hybrid Solar Collectors Technology: A Case Study in Residential Application

Giuseppe Emmi Chiara Tisato Angelo Zarrella Michele De Carli 

Department of Industrial Engineering – DII, University of Padova, Italy

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Nowadays the heat pump technology is an efficient solution in the residential sector since it allows to reduce CO2 emissions and to exploit renewable energy sources. At the same time, the solar energy is the renewable source for excellence.

In this study, different combinations of a photovoltaic thermal hybrid solar collector (PVT) and a multi-source heat pump for space heating and domestic hot water (DHW) production have been investigated. The air, solar and ground heat sources for the heat pump were analysed. The case study regards the heat demand of a single-family house building located in north-east of Italy. The considered system configurations have been investigated by means of the simulation tool TRNSYS coupled to a dedicated mathematical model for the estimation of the electrical and thermal performances of solar panels. This model is based on the equivalent electrical circuit.

As a result, all the investigated multi-source systems reported an increase of energy efficiency between 14% and 26% compared to a standard air to water heat pump system. The system with air and solar sources has an energy efficiency equal to 3.64, slightly lower than that obtained for the more complex systems.


geothermal energy, multi-source heat pump, PVT, solar energy


[1] ISPRA – Istituto Superiore per la Protezione e la Ricerca Ambientale, Emissioni nazionali di gas serra, Rapporti 220/2015, 30 Aprile 2015, ISBN 978-88-448-0709-2 (in Italian).

[2] Emmi, G., Zarrella, A., De Carli, M. & Galgaro, A., An analysis of solar assisted ground source heat pumps in cold climates. Energy Conversion and Management, 106, pp. 660–675, 2015.

[3] Trillat-Berdal, V., Souyri, B. & Fraisse, G., Experimental study of a ground-coupled heat pump combined with thermal solar collectors. Energy and Buildings, 38, pp. 1477– 1484, 2006.

[4] Eslami-nejad, P., Langlois, A., Chapuis, S., Bernier, M. & Faraj, W., Solar heat injection into boreholes. Proceedings of the 4th Canadian Solar Buildings Conference, Toronto: Ontario, Canada, 2009.

[5] Kjellsson, E., Hellstrom, G. & Perers, B., Optimization of systems with the combination of ground-source heat pump and solar collectors in dwellings. Energy, 35, pp. 1–7, 2009.

[6] Hawlader, M.N.A., Chou, S.K. & Ullah, U.Z., The performance of a solar assisted heat pump water heating system. Applied Thermal Engineering, 21, pp. 1049–1065, 2001.

[7] Dott, R., Genkinger, A. & Afjei, T., System evaluation of combined solar & heat pump systems. Energy Procedia, 30, pp. 562–570, 2012.

[8] Bakker, M., Zondag, H.A., Elswijk, M.J., Strootman, K.J. & Jong, M.J.M., Perfor- mance and costs of a roof-sized PV/thermal array combined with a ground coupled heat pump. Solar Energy, 78, pp. 331–339, 2005.

[9] Leonforte, F., Ph.D. Thesis, Messa a punto e analisi prestazionale di un collettore ibrido fotovoltaico termico a fluido termovettore acqua, XXVI Ciclo, Politecnico di Milano (in Italian).

[10] Chow, T.T., Performance analysis of photovoltaic-thermal collector. Solar Energy, 75, pp. 143–152, 2003.

[11] Herrando, M., Markides, C.N. & Hellgardt, K., A UK-based assessment of hybrid PV and solar-thermal systems for domestic heating and power: system performance. Applied Energy, 122, pp. 288–309, 2014.

[12] Aste, N., Leonforte, F. & Del Pero, C., Design, modeling and performance monitoring of a photovoltaic–thermal (PVT) water collector. Solar Energy, 112, pp. 85–99, 2015.

[13] Rejeb, O., Dhaou, H. & Jemni, A., A numerical investigation of a photovoltaic thermal (PV/T) collector. Renewable Energy, 77, pp. 43–50, 2015.

[14] Zondag, H.A., Flat-plate PV-Thermal collectors and systems: a review. Renewable and Sustainable Energy Reviews, 12, pp. 891–959, 2008.

[15] U.S. Department of Energy-DOE, EnergyPlus Energy Simulation Software, avail- able at: Vicenza.160940_IGDG

[16] Domestic hot water profiles. IEA/ECBCS Annex 42, available at: http://www.ecbcs. org/annexes/annex42.htm