In a space of a data center or the like where many disk array apparatuses and electronic equipment systems are arranged, it is an object of the present invention to reduce the energy required for cooling the apparatus itself and cooling the space. In electronic equipment having heat generating elements such as a disk array apparatus or CPU, low-temperature waste heat exhausted from the equipment is heated through a vapor compression cycle once and then recovered as cold water through an absorption refrigeration cycle. In the space of a data center or the like where many disk array apparatuses and electronic equipment systems are arranged, this can reduce the energy required for cooling the apparatus itself and cooling the space, drastically improve the processing speed and reliability of the apparatus/system and realize capacity and speed enhancements.