抄録
Some kinds of the generation systems for the mass-production using alternative energy have been already developed. Therefore, it has not been achieved that the systems using small temperature difference (sSTD) become popular in society. In this paper, a simple model that the processes of the new technologies spread into the society is assumed, then, the requirement spreading the Rankine sSTD is discussed. And it has been pointed out the two rules have to be filled when the sSTD technologies become popular. It is first one that key materials are lying on the big market or create large consumption, and second one that they have high potential of LCA.
