BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVIII (LXII), Fasc. 1, 2012 Secţia CONSTRUCŢII. ARHITECTURĂ USE OF RENEWABLE ENERGY TO ENSURE THE THERMAL INDEPENDENCE FOR A LIVING BUILDING USING SOLAR HYBRID SYSTEMS BY MARIUS-COSTEL BALAN * , VASILICĂ CIOCAN and MARINA VERDEŞ “Gheorghe Asachi” Technical University of Iaşi Faculty of Civil Engineering and Building Services Received: January 30, 2012 Accepted for publication: March 30, 2012 Abstract. Making solar hybrid systems and their integration within existing buildings or new buildings require financial efforts and special materials, such as attention to these systems is not accidental. This comparative study of a classic system and one proposed applicable to the residential buildings, is a step in the design phase and planning for such systems in order to achieve the ultimate goal: economic increase and energy efficiency. The aim is to achieve a unified analysis of solar hybrid system, the application actually achieved in a residential building. The comparison is even more necessary and more difficult because the solar hybrid systems are complex technical systems, the multiplicity of performance evaluation criteria often leads to the need for a global criterion (economic). Key words: heat pump; solar energy; solar collector; efficiency; cost. 1. Introduction Improving energy efficiency of industrial processes and residential, stands – largely – by introducing the secondary circuit energy resources and develop simultaneously occurring processes of this type. * Corresponding author: e-mail: balanmariuscostel@gmail.com