The new EU Commission GHG emissions targets involve a redaction least 55% by 2030. Energy efficiency is a key component of this process towards decarbonisation, as is increasing the electrification of final energy consumption. As part of energy transition, choice a heat pump system is a preferential solution to be pursued in the building sector. However, increasing energy efficiency and electrifying buildings is complex. Even more, the decarbonisation of the residential sector also presents a criticality, when the keep of radiators is needed, to guarantee the design of heat exchange which requires a high supply temperature. A strategy which allows improving the energy efficiency of so configured plants and involves a share of renewable energy in the service of the plant-building system is to propose a hybrid system (HHP) consisting of a natural gas boiler (NGB) coupled with an air source heat pump (ASHP) or using absorption GHP systems. A further step is represented by the integration of RES, by photovoltaic thermal panels (PVT), which allow to design innovative and affordable solar-assisted heat pumps. In addition, IEA analysis highlights the economic relevance of the Carbon Avoidance Cost (CAC) in the NZE scenario, given the subjection of many countries to CO 2 tax. The research results aim to outline the optimal environmental and economic solution for the renewal of high-temperature systems in existing multifamily buildings in the framework of the Decarbonization pathway where sustainability means saving fossil energy, reducing greenhouse gas emissions and increasing system efficiency alongside cost-effectiveness.
BIOGRAPHICAL NOTEAndrea VALLATI (born in Rome 16 October 1970) is an Italian engineering and Associate Professor in Energy and Heat Transfer field on Sapienza university of Rome.
He joins Department DIAEE (Department of Astronautic, Electric and Energy Engineering) of Sapienza University of Rome. He is a member of the PhD Course in Energy and Environment at Sapienza University of Rome. He is the Manager and Scientific Responsible of the Laboratory of Energy and Thermodynamic of DIAEE Department.
He is a member of the Editorial Board of the Progress in Computational Fluid Dynamics, An International Journal, Journal of Power Technologies, Rynek Energii and Energies Journal.
He is a permanent member of Scientific Committee of ICCHMT Conferences and Local Chair of ICCHMT 2019 Conference. He has been, and currently is, the scientific coordinator of several international research projects. His current research interests include energy saving, energy and buildings, CFD in outdoor and indoor environment, energy efficiency, optimization of HVAC systems and the heat transfer above the soil. He is author or co-author of more than 100 scientific works on heat transfer, applied thermodynamics and energy saving, 58 of which are published in peer-reviewed international journals. The Hindex is 20 (Scopus index) and number of citations in the last 10 year is 879.