Micro heat engines have attracted considerable interest in recent years for their potential exploitation as<br/>micro power sources in microsystems and portable devices. Thermodynamic modeling can predict the<br/>theoretical performance that can be potentially achieved by micro heat engine designs. An appropriate<br/>model can not only provide key information at the design stage but also indicate the potential room for<br/>improvement in existing micro heat engines. However, there are few models reported to date which are<br/>suitable for evaluating the power performance of micro heat engines. This paper presents a new thermodynamic<br/>model for determining the theoretical limit of power performance of micro heat engines<br/>with consideration to finite heat input and heat leakage. By matching the model components to those of<br/>a representative heat engine layout, the theoretical power, power density, and thermal efficiency<br/>achievable for a micro heat engine can be obtained for a given set of design parameters. The effects of key<br/>design parameters such as length and thermal conductivity of the engine material on these theoretical<br/>outputs are also investigated. Possible trade-offs among these performance objectives are discussed.<br/>Performance results derived from the developed model are compared with those of a working micro heat<br/>engine (P3) as an example
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