Mathematical models proposed for calculating the utilization magnitudes and utilization proportions of renewable energies for satisfying the building energy requirement

With the progressive realization of fuel-based energies replaced by renewable energies, the electricity generation based on 100% renewable energy will eventually achieve in the future. Therefore, before realization of the 100% renewable electricity generation, it is of importance to analyze and optimize the renewable energy system mix in advance. Via power footprint, the mathematical models used for evaluation of the 100% renewable electricity generation in each province/municipality of China towards satisfaction of the building energy requirement were created. The proposed mathematical models can be applied to evaluate the utilization magnitudes and utilization proportions of target energies, in any given year before or the year that the 100% renewable electricity generation is realized. And, based on the proposed mathematical models, the energy transfer trace (i.e., power footprint) from renewable energies to electricity used in the buildings can be able to be explored. Moreover, the optimum exploitation and utilization methods for hydro energy, wind energy and solar energy were proposed in this work, aiming at the energy conversion efficiency improvement. The research results are expected to provide the policy makers with some useful guidelines and references.