TY - GEN
T1 - A micro heat engine executing an internal carnot cycle
AU - Lurie, Eli
AU - Kribus, Abraham
N1 - Funding Information:
This work was supported by the Marine Ecosystems Analysis (MESA) Program of NOAA, and by the University Awards Committee of the Research Foundation and the State University of New York. Contribution 205 of the Marine Sciences Research Center (MSRC) of the State University of New York at Stony Brook.
PY - 2009
Y1 - 2009
N2 - A micro heat engine, based on a cavity filled with a stationary working fluid under liquid-vapor saturation conditions and encapsulated by two membranes, is described and analyzed. This engine design is easy to produce using MEMS technologies and is operated with external heating and cooling. The motion of the membranes is controlled such that the internal pressure and temperature are constant during the heat addition and removal processes, and thus the fluid executes a true internal Carnot cycle. A model of this Saturation Phase-change Internal Carnot Engine (SPICE) was developed including thermodynamic, mechanical and heat transfer aspects. The efficiency and maximum power of the engine are derived. The maximum power point is fixed in a three-parameter space, and operation at this point leads to maximum power density that scales with the inverse square of the engine dimension. Inclusion of the finite heat capacity of the engine wall leads to a strong dependence of performance on engine frequency, and the existence of an optimal frequency. Effects of transient reverse heat flow, and 'parasitic heat' that does not participate in the thermodynamic cycle are observed.
AB - A micro heat engine, based on a cavity filled with a stationary working fluid under liquid-vapor saturation conditions and encapsulated by two membranes, is described and analyzed. This engine design is easy to produce using MEMS technologies and is operated with external heating and cooling. The motion of the membranes is controlled such that the internal pressure and temperature are constant during the heat addition and removal processes, and thus the fluid executes a true internal Carnot cycle. A model of this Saturation Phase-change Internal Carnot Engine (SPICE) was developed including thermodynamic, mechanical and heat transfer aspects. The efficiency and maximum power of the engine are derived. The maximum power point is fixed in a three-parameter space, and operation at this point leads to maximum power density that scales with the inverse square of the engine dimension. Inclusion of the finite heat capacity of the engine wall leads to a strong dependence of performance on engine frequency, and the existence of an optimal frequency. Effects of transient reverse heat flow, and 'parasitic heat' that does not participate in the thermodynamic cycle are observed.
UR - http://www.scopus.com/inward/record.url?scp=70349934442&partnerID=8YFLogxK
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AN - SCOPUS:70349934442
SN - 9780791843192
T3 - 2008 Proceedings of the 2nd International Conference on Energy Sustainability, ES 2008
SP - 165
EP - 172
BT - 2008 Proceedings of the 2nd International Conference on Energy Sustainability, ES 2008
T2 - 2008 2nd International Conference on Energy Sustainability, ES 2008
Y2 - 10 August 2008 through 14 August 2008
ER -