In summer, because atmosphere temperature is higher, make amass concrete from construction site of material, mix and transport to pour process continuously absorb calories from atmosphere, and make concrete inner calories pile up, thus make its inner temperature rise (also calories absorb).

Safe employment of the injection type hybrid active power filter (IHAPF) is threatened badly by the energy pour backward, however few papers focused on it.

The testing results are as follows: Thermal efficiency achieves 90% around, add the "returned heat", the "gross heat for use per day" finally achieves 22.