In recent years, fossil fuels such as petroleum, coal, and natural gas have become limited resources. In addition, bad effects caused by excessive carbon dioxide (CO 2) emissions have now begun destroying our global environment seriously. Since current living and economical standards depend strongly on fossil energy sources, it is necessary to realize a new society that utilizes biomass as a source of energy. In this background, in 2005, we manufactured a practical Stirling engine using woody biomass fuels for the first time in Japan. Further we proposed a unique co-generation system with the Stirling engine that uses woody biomass fuels such as sawdust, firewood, and wood pellets. In that co-generation system, a burner uses the woody biomass fuel to heat the air in the expansion room of the Stirling engine to about 650°C, and a water cooling system cools the air in the compression room of the engine to about 40°C. Under these operating conditions, the practical Stirling engine can generate about 3kW of electricity. In addition to the heat from the burner, which is easily recovered, the cooling water of the engine also provides useable heat. By use of simple heat exchangers, this heat can be used for domestic space heating and heating of greenhouses as well as supplying domestic hot water needs. This co-generation system utilizes up to 45% of the system-input energy in the form of electricity or heat. In this co-generation system, 43% of the input energy is wasted as heat loss from the exhaust smoke into the atmosphere. Therefore we tried to recover the waste heat by using a thermoelectric conversion module in this study. And also the performance of the Stirling cooler system using electric power based on woody biomass was tested. Due to the practical application of this combined utilization, a unique system in which both heating/cooling and power generation are available can be constructed.
Atime has come to reflect on civnization blessed with convenient fbss 矼 fuels fbr the past lOOyears. Fossi且fUeis such as petro 正 eum , coal , and natural gas have become 直 imitcd resources 」 n addition , bad ef − fects caused by excessive carbon dioxide ( COz )have now begun destroying our globai environment seri ・ ously . Since current living and economical standards depend strongly on fbssil energy sources , it{ s nec − essary to realize a new society that utnizes biomass as a source ofenergy .In such background . we manufactured the practica 】 Stirling engine using biomass 魚 els in 2005 , And we proposed a unique co − generation system by thc cnginc lhat uses woody biomass fuels . The co − gencration system provided about 3kW efelectricity and the heat frorn the system can be recovered and used in a number ofways f( )r space and domestic water heat ま ng . The co ・ generat 量 on system 量 s utTlizes up to 45 % ofthe system input energy in the form ofelectricl 【 y or heat. 1償 his study , we し ried to recover the was 重 e heat of 43% by using a thermoeiectric conversion module , And the Stirling cooler using electric power based woody blomass energy is tested in performancc .
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