Abstract
The Stirling engine is a device that allows conversion of thermal energy into mechanical energy with relatively high efficiency. Existing commercial designs are mainly based on the usage of high temperature heat sources, whose availability from renewable or waste heat sources is significantly lower than that of moderate temperature sources. The paper presents the results of experimental research on a prototype alpha type Stirling engine powered by a moderate temperature source of heat. Obtained results enabled calibration of the evaluated theoretical model of the Stirling engine. The model of the engine has been subsequently used for the analysis of regenerator effectiveness influenced by the charge pressure and the heating temperature. Performed study allowed to determine further development directions of the prototype engine to improve its power and efficiency. As a result of optimization, worked out design will potentially increase the indicated efficiency up to 19.5% (5.5% prototype) and the indicated power up to 369 W (114 W prototype).
Highlights
Interest in systems converting thermal energy into mechanical energy and especially Stirling technology derives from the increased demand for better management of heat obtained from other processes [1,2,3]
Temperature and flow rate of the exhaust gas have been controlled by operating point of the internal combustion (IC) engine, using an electrical brake connected to the IC engine (Figure 2)
The operating parameters of a prototype alpha type Stirling engine presented in the paper indicate that for a moderate temperature level, increasing charge pressure is only beneficial to a certain level
Summary
Interest in systems converting thermal energy into mechanical energy and especially Stirling technology derives from the increased demand for better management of heat obtained from other processes [1,2,3]. For the correct operation of the device the burning gas temperature, in the combustion chamber, should not be lower than 1000 ◦ C Another example of a commercial cogeneration unit with a Stirling engine that can be supplied with energy from renewable sources, is a unit from Stirling Biopower (Ann Arbor, MI, USA). To conclude, powering a Stirling engine with renewable energy or waste heat can be efficiently applied when the heat exchange surface of the heater is significantly increased, to cover energy demand for much lower temperature (moderate) of the energy source This solution in turn, causes an increase of the dead volume, which contributes to the reduction of the thermal efficiency of the device. Performed study allowed to determine further development directions of the prototype engine to improve its power and efficiency
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
