24 June 2014


A local solar heat generation with solar thermal collectors or photovoltaic modules combined with the use of ambient heat by heat pumps can provide powerful solutions in
building heat supply for a one hundred per cent renewable energy strategy. Four system combinations are compared in the field of energetic, economic and ecologic criterion. Therein
a heat pump plus photovoltaic variant shows benefits in all three fields of evaluation while the other systems have their individual specific strength. A predominantly solar thermal heat
generation with long-term heat storage causes the lowest electricity consumption at all, but prohibits on-site electricity generation with in the end highest cost. Ice storage systems can also reduce the grid electricity consumption especially by using photovoltaic-thermal absorbers, but include optimization potential in the field of reducing system cost due to their rather new application for space heating.