Study of Methods to Enhance Energy Utilization Efficiency of Micro Combined Heat and Power Generation Unit-Equipped with an Extended Expansion Linkage Engine and Reduction of Waste Energy Honda R&D Company, Limited

Format:

Book

Conference/Event

Author/Creator:

Takita, Yoshiharu, author.

Contributor:

Kōno, Shōhei

Naoi, Atsumu

Conference Name:

Small Engine Technology Conference & Exposition (2011-11-08 : Sapporo, Japan)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Tokyo, JAPAN Society of Automotive Engineers of Japan 2011

Summary:

To increase energy utilization efficiency of a micro combinedheat and power generation unit, methods for simultaneouslyenhancing efficiencies of power generation and of heat recovery,which are normally in the trade-off relationship has beenstudied.To increase power generation efficiency, an extended expansionlinkage engine higher in thermal efficiency than conventionalengines has been adopted. The power generation efficiency wasenhanced by 3.8 points to 26.3% from 22.5% of a conventionalmodel.However, since introducing an extended expansion engineincreases kinetic energy and lowers the temperature of exhaust gasfrom the engine, it is difficult to enhance the heat recovery.Focusing on the fact that most released heat energy is dischargedthrough ventilation from the unit, ventilation cooling system wasreexamined, and reduction of the released heat energy wasconsidered.First, positioning of heat-generative electronic parts on theinverter was changed, and the minimum airflow necessary for coolingwas determined. In order to cool the entire unit with this airflow,an effective way to cool the alternator and the engine room wasexamined, and a method in which the ventilation which previouslycooled the alternator is then delivered into the engine room wasadopted.Consequently, it became possible to reduce the airflow rate from35 m₃/h in a conventional model to 13 m₃/h, and the heat recoveryefficiency was enhanced by 2.7 points to 65.7%. The simultaneousenhancement in efficiencies of power generation and heat recoverywas realized, and energy utilization efficiency reached 92%, a 6.5point increase from 85.5% (the efficiency is based on the lowerheating value)

Notes:

Vendor supplied data

Publisher Number:

2011-32-0574

Access Restriction:

Restricted for use by site license