By using various working medium+absorbent systems containing nitrate-based absorbents, a single-stage absorption heat transformer and an advanced absorption heat transformer were evaluated for theoretical performance characteristics. Six working medium+absorbent systems containing nitrates -- H₂O+LiBr+LiNO₃, H₂O+LiCl+LiNO₃, H₂O+LiI+LiNO₃, H₂O+Ca(NO₃)₂ +LiNO₃, H₂O+Ca(NO₃)₂ +LiNO₃ +KNO₃, and H₂O+LiNO₃ +NaNO₃ +KNO₃ -- were chosen for comparison with an H₂O+LiBr system. For the advanced absorption heat transformer, two types of high-temperature-lift cycles and three types of high-efficiency cycles were used for simulation. The systems H₂O+Ca(NO₃)₂ +LiNO₃ and H₂O+ Ca(NO₃)₂ +LiNO₃ +KNO₃ , which are less corrosive, can be used in the high-temperature range where the H₂O+LiBr system cannot.

Units: SI