The concentration and performance of the information processing devices that make up these systems are increasing rapidly, and this has led to an increase in the heat concentration of Data Centers as well. For this reason, air conditioning systems for Data Centers must offer a high level of reliability to constantly maintain appropriate room temperatures. In this paper, we will use the previously proposed calculation method to conduct the following studies, targeting cases in which the systems have actually been implemented. 1) Simulation to grasp the reliability characteristic in the system. 2) Examination for introducing thermal storage equipment to an information processing room.