A novel closed type heat-power conversion system was proposed by integrating the essential principles of both reverse electrodialysis(RED)power generation technology and absorption refrigeration/heating technology.Besides

the working mediums solutions(consisted of solute and solvent) were found to be one of the vital factors for energy conversion efficiency of this new power generation system.Altogether

nine solutes(monovalent inorganic salts) and seventeen solvents(with the normal bubble point temperature within 40-150℃) have been selected as the focused substances

and their thirteen crucial properties(bubble point temperature

latent heat of vaporization

specific heat capacity

solubility

acentric factor

dipole moment

relative dielectric constant

electric conductance

viscosity

thermal conductance

auto-ignition temperature

flammability limit

and toxicity)

have beencompared and analyzed.Further

methodology of comprehensively assessing the availability of working mediums for this new heat-power conversion system has been established after finishing a series of discussions that were carried out from the aspects of their fundamental thermophysical properties

transport features

electrochemistry characteristics

and dangerousness.Finally

it is ternary type working mediums that consisted of inorganic salt-solute-modifier

are deduced to be in bright prospect.