Building hvac retrofitting using a pv assisted dc heat pump coupled with a pcm heat battery and optimal control algorithmEttore Zanetti, Rossano Scoccia, Marcello Aprile, Mario Motta, Livio Mazzarella, Maurizio Zaglio and Jakub PlutaE3S Web Conf., 111 (2019) 04041DOI: https://doi.org/10.1051/e3sconf/201911104041