E107 CONSTRUCTION OF HEAT RECOVERY GENERATION SYSTEM FOR COGENERATION IN COMMERCIAL AND RESIDENTIAL SECTORS(Distributed Energy System-1)

Abstract

This study is intended to develop the waste heat recovery generation system for cogeneration system using a small capacity prime mover in the range of about 500 kW or less. As the first step, the optimal heat recovery cycle and working fluid of the cycle is examined by the cycle simulation. The result shows that Rankine cycle with steam as working fluid is more advantageous from the point of the recovery output than Kalina cycle with ammonia and water mixture. As the second step, a scroll expander has attracted attention as a power recovery device, and the performance characteristics of it are investigated through the experiments. The result shows that the scroll expander is an efficient device using steam as working fluid for the small capacity power systems Moreover, we improved the efficiency of the scroll expander, and the value reaches up to 51.9% at the maximum in the conditions of revolution speed 2100 rpm.