Air-conditioning control in a building is generally adopted as a way to keep room temperatures constant. However, this air-conditioning is controlled using the room temperature alone. As a result,energy might be uselessly expended through maintaining the cold or hot condition that depends on the value of the set-temperature. Moreover, it is said that the way people feel cool or warm condition is dependent on many factors,not just temperature. Therefore,in the course of this study, we have developed an algorithm for computing and outputting the optimum suitable temperature for indoor thermal environments by inputting the mathematical elements of the predicted mean vote(PMV),which is a therml comfort index,in order to creat better thermal environments. We also created a program for the execution of this algorithm. The validity of this algorithm was then confirmed through simulations for the output of optimum temperature using this program. Furthermore ,this program was implemented in a DDC controller,and a prototype control unit incorporatimg this DDC controller was fabricated. A verification test was performed using actual equipment with this control unit, and the potential of this air-conditioning control system has been confirmed using the optimum temperature output as the desired value.

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In these decades, various types of gas co-generation system have been developed and introduced into several sites such as hospitals, hotels, commercial buildings, district heating & cooling center, factories etc.to realize energy saving and reduce greenhouse gases. Typical to integrate a co-generation system are gas engine, gas turbine and fuel cell, and the recent trend of development for such components is high efficiency large scale model or distributed small scale model. In addition to obtain high-efficient power by interconnected operation, an emergency power could be supplied by islanding operation that is the most distinctive ability to keep social infrastructure from disasters. On the contrary high-efficient types of co-generation are not suitable to be operated by islanding operation because of its stability at load changes. In this paper we describe the high efficient gas engine co-generation combined with power storage divices to establish the stability at islanding operation and uninterrupted emergency power supply to the critical loads. And we show the design of cooperative control between two power sources to derive better performance of the integration.

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