1. Home
  2. Honda R&D Technical Review Vol.23 N...
  3. Development of Micro Combined Heat ...

Technical Review e-Book: Summary

Development of Micro Combined Heat and Power Generation Unit with Extended Expansion Linkage Engine

Article of Honda R&D Technical Review Vol.23 No.2

Summary

A micro combined heat and power generation (CHP) unit that uses an extended expansion linkage engine (EXlink) has been developed with the aim of simultaneously enhancing fuel efficiency and reducing the unit size. This is the first mass production known to date of a compact engine that uses an original multiple linkage system to realize an Atkinson cycle.
EXlink increases the power output efficiency by using a linkage system to extend the expansion and exhaust stroke lengths relative to the intake and compression stroke lengths. Use of EXlink in a micro CHP unit increased the power generating efficiency by 3.8 points to 26.3% (lower heating value: LHV), and optimization of the heat flow design also increased the overall efficiency by 6.5 points to 92% (LHV), compared to the 2006 model.
The increased engine efficiency enabled reduction of the intake air amount which reduced the intake and exhaust noise and achieved a CHP unit noise value of 43 dB(A)/1m (Japanese specifications).
A depth of 298 mm was achieved in consideration of installation in the narrow spaces around a typical Japanese house. In addition to revision of the parts layout, this realized a 33% reduction in chassis volume and an 11-kg weight reduction compared to the 2006 model.

Reference

(1) Takaishi, T., Ara, M., Togawa, K.: Introduction of Micro Combined Heat and Power Generation Unit for Residential Use, Honda R&D Technical Review, Vol. 15, No. 1, p. 53-58
(2) Watanabe, S., Kono, S., Kurata, M., Koga, H.: Research on Extended Expansion General Purpose Engine -Theoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency-, Honda R&D Technical Review, Vol. 18, No. 1, p. 81-87
(3) Koga, H., Watanabe, S.: Research on Extended Expansion General Purpose Engine (Part 2) -Heat Release and Brake Performance-, Honda R&D Technical Review, Vol. 19, No. 1, p. 53-59
(4) Watanabe, S., Koga, H., Kono, S.: Research on Extended Expansion General-Purpose Engine Theoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency, SAE paper, 2006-32-0101 (2006)
(5) Koga, H., Watanabe, S.: Research on Extended Expansion General-Purpose Engine -Heat Release and Friction- , SAE paper, 2007-32-0003 (2007)
(6) Naoe, G., Watanabe, S.: Research on Extended Expansion General-Purpose Engine -Characteristic of Vibration- , SAE paper, 2008-32-0012 (2008)
(7) Watanabe, S., Naoe, G., Sato, Y.: Research on Extended Expansion General-Purpose Engine -A Numerical Approach to Reduce Vibration- , SAE paper, 2009-01-1006 (2009)
(8) Naoe, G., Watanabe, S.: Research on Extended Expansion General-Purpose Engine -Noise Characteristics Caused by Multiple Linkage System and Reduction of the Noise- , SAE paper, 2009-32-0042 (2009)
(9) Kono, S., Koga, H., Watanabe, S.: Research on Extended Expansion General-Purpose Engine -Efficiency Enhancement by Natural Gas Operation-, SAE paper, 2010-32-0007 (2010)
(10) Ueno, M., Eguchi, H., Enomoto, T., Ogawa, M.: Study of Power Generation Loss Decrease in Small Gas Engine Cogeneration, SAE Paper, 2008-32-0044 (2008)

Author (organization or company)

Yoshiharu TAKITA(Power Products R&D Center)、Shohei KONO(Power Products R&D Center)、Hideaki TAKADA(Power Products R&D Center)、Kunihiro KITSU(Power Products R&D Center)、Atsumu NAOI(Power Products R&D Center)、Koichi TSUNO(Power Products R&D Center)

We would like to get your opinion on this research paper. (This is only applicable to registered members.)

The readers of this research paper have also selected these research papers.

Research on Inertia Force Characteristics and Its Reduction in Extended Expansion Linkage Engine
Article of Honda R&D Technical Review Vol.24 No.1
Research on Extended Expansion General-Purpose Engine – Theoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency –
Article of Honda R&D Technical Review Vol.18 No.1
Research on Extended Expansion General-Purpose Engine (Part 2) – Heat Release and Brake Performance –
Article of Honda R&D Technical Review Vol.19 No.1