Abstract: The present invention relates to a process for utilizing energy produced by the phase change of liquid, such as fluoronated hydrocarbon, light fraction hydrocarbon, lower alcohol and ethers using the heat coming from unused heat sources for example, the heat of the earth, the heat of hot springs, the heat of the warm waste water of factory and power plant. The present invention is applicable to transfer the heat of the unused heat source from the low place to the high place in order to use said heat for farming and cultivation at the high and cold places. The present invention is also applicable to transfer of the mass energy of the liquid from the low place to the high place by uniformly mixing the said liquid with the ascending saturated or super-saturated vapor of the said liquid.