Abstract
This paper describes the development of a mathematical model for a beta-type Stirling engine with rhombic drive mechanism. This model is based on thermodynamics, heat transfer, mass transfer, and machine dynamics considerations, and it estimates the power output and efficiency of a beta-type Stirling engine depending on different geometric and operational variables. The model is used to conduct a parametric investigation on the effect of various geometric and operational parameters on the overall performance of the engine and to shed light on the underlying mechanisms responsible for the observed trends. The results show that the geometric parameters such as the height of the displacer and crank length affect the engine performance by altering the compression ratio of the engine, whereas the impact of width of the regenerative channel is through pumping losses for fluid flow between the hot and cold chambers of the engine. The operational variable, engine speed, is shown to influence the amount of heat transfer to and from the working fluid since it directly affects the residence time of fluid in the hot and cold chambers and accordingly it has a bearing on the engine performance.
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Abbreviations
- \(d_{1}\) :
-
Displacer diameter (mm)
- \(d_{2}\) :
-
Inside diameter of cylinder (mm)
- \(G\) :
-
Width of regenerative channel (mm)
- \(h\) :
-
Enthalpy (kJ/kg)
- \(l_{1} ,l_{2} ,l_{3} ,l_{4}\) :
-
Link lengths (mm)
- \(l_{\text{d}}\) :
-
Displacer cylinder length (mm)
- \(l_{t}\) :
-
Engine length (mm)
- \(L\) :
-
Distance between the gears (mm)
- \(L_{\text{dt}}\) :
-
Total length of displacer and its rod (mm)
- \(L_{\text{Pt}}\) :
-
Total length of power piston and its rod (mm)
- \(m\) :
-
Mass of the working fluid (kg)
- \(\dot{m}\) :
-
Mass flow rate (kg/s)
- \(P\) :
-
Pressure (kPa)
- \(Q\) :
-
Volumetric flow rate (m3/s)
- \(Q_{\text{in}}\) :
-
Input heat transfer per cycle (kJ/cycle)
- \(\dot{Q}\) in :
-
Input heat transfer rate (kJ/cycle)
- \(r_{1}\) :
-
Displacer radius (mm)
- \(r_{2}\) :
-
Inside radius of cylinder (mm)
- \(r\) :
-
Radial coordinates
- \(R\) :
-
Characteristic gas constant of working fluid (J/kg k)
- \(R_{\text{d}}\) :
-
Crank length (mm)
- \(R_{t1}\) :
-
Overall resistance to heat transfer between hot source and working fluid in the expansion chamber (°C/kw)
- \(R_{t2}\) :
-
Overall resistance to heat transfer between cold source and working fluid in the compression chamber (°C/kw)
- \(t_{{\mathrm{max}}}\) :
-
Computation maximum time (s)
- \(t\) :
-
Time (s)
- \(t_{\text{P}}\) :
-
Time period (s)
- \(t_{\text{o}}\) :
-
Reference time (s)
- \(T\) :
-
Temperature (k)
- \(T_{\text{H}}\) :
-
Heat source temperature (k)
- \(T_{\text{L}}\) :
-
Heat sink temperature (k)
- \(U\) :
-
Internal energy (kJ/s)
- \(V\) :
-
Volume (m3)
- \(v\) :
-
Velocity (m/s)
- \(\dot{W}\) out :
-
Power output (kJ/s)
- \(W_{\text{out}}\) :
-
Net work output per cycle (kJ/cycle)
- \(Y\) :
-
Displacement
- \(z\) :
-
Axial coordinate
- \({\text{c}}\) :
-
Compression chamber
- d:
-
Displacer
- e:
-
Expansion chamber
- P:
-
Piston
- r:
-
Regenerative channel gap
- \(\theta\) :
-
Crank angle (rad)
- \(\varepsilon\) :
-
Regeneration effectiveness
- \(\int\) :
-
Fluid density (kg/m3)
- \(\eta\) :
-
Efficiency
- \(\varpi\) :
-
Engine speed (rpm)
References
Ahmadi Mohammad H, Hosseinzade H, Sayyaadi H, Amir H, Kimiaghalam (2013a) Application of the multi-objective optimization method for designing a powered Stirling heat engine: design with maximized power, thermal efficiency and minimized pressure loss. Renew Energy 60:313–322. https://doi.org/10.1016/j.renene.2013.05.005
Ahmadi Mohammad H, Mohammadi AH, Dehghani S, Barranco-Jimenez MA (2013b) Multi-objective thermodynamic-based optimization of output power of Solar Dish-Stirling engine by implementing an evolutionary algorithm. Energy Convers Manag 75:438–445. https://doi.org/10.1016/j.enconman.2013.06.030
Ahmadi Mohammad H, Sayyaadi H, Mohammadi AH, Barranco-Jimenez MA (2013c) Thermo-economic multi-objective optimization of solar dish-Stirling engine by implementing evolutionary algorithm. Energy Convers Manag 73:370–380. https://doi.org/10.1016/j.enconman.2013.05.031
Ahmed F, Hulin H, Khan AM (2019) Numerical modeling and optimization of beta-type Stirling engine. Appl Therm Eng 149:385–400. https://doi.org/10.1016/j.applthermaleng.2018.12.003
Cheng CH, Yang HS (2012) Optimization of geometrical parameters for Stirling engines based on theoretical analysis. Appl Energy 92:395–405. https://doi.org/10.1016/j.apenergy.2011.11.046
Cheng CH, Yu YJ (2010) Numerical model for predicting thermodynamic cycle and thermal efficiency of a beta-type Stirling engine with rhombic-drive mechanism. Renew Energy 35(11):2590–2601. https://doi.org/10.1016/j.renene.2010.04.002
Cheng CH, Yu YJ (2011) Dynamic simulation of a beta-type Stirling engine with cam-drive mechanism via the combination of the thermodynamic and dynamic models. Renew Energy 36(2):714–725. https://doi.org/10.1016/j.renene.2010.07.023
Cheng CH, Yu YJ (2012) Combining dynamic and thermodynamic models for dynamic simulation of a beta-type Stirling engine with rhombic-drive mechanism. Renew Energy 37(1):161–173. https://doi.org/10.1016/j.renene.2011.06.013
Cheng CH, Yang HS, Keong L (2013) Theoretical and experimental study of a 300-W beta-type Stirling engine. Energy 59:590–599. https://doi.org/10.1016/j.energy.2013.06.060
Eid E (2009) Performance of a beta-configuration heat engine having a regenerative displacer. Renew Energy 34(11):2404–2413. https://doi.org/10.1016/j.renene.2009.03.016
Hossein Ahmadi Mohammad, Sayyaadi H, Dehghani S, Hosseinzade H (2013) Designing a solar powered Stirling heat engine based on multiple criteria: maximized thermal efficiency and power. Energy Convers Manag 75:282–291. https://doi.org/10.1016/j.enconman.2013.06.025
Ross A (1993) Making stirling engines. Ross Exp 1993:5
Salazar JL, Chen WL (2014) A computational fluid dynamics study on the heat transfer characteristics of the working cycle of a β-type Stirling engine. Energy Convers Manag 88:177–188. https://doi.org/10.1016/j.enconman.2014.08.040
Shendage DJ, Kedare SB, Bapat SL (2011) An analysis of beta type Stirling engine with rhombic drive mechanism. Renew Energy 36(1):289–297. https://doi.org/10.1016/j.renene.2010.06.041
Solmaz H, Karabulut H (2014) Performance comparison of a novel configuration of beta-type Stirling engines with rhombic drive engine. Energy Convers Manag 78:627–633. https://doi.org/10.1016/j.enconman.2013.11.028
Yaqi L, Yaling H, Weiwei W (2011) Optimization of solar-powered Stirling heat engine with finite-time thermodynamics. Renew Energy 36(1):421–427. https://doi.org/10.1016/j.renene.2010.06.037
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Raghavendra, H., Suryanarayana Raju, P. & Hemachandra Reddy, K. Effect of Geometric and Operational Parameters on the Performance of a Beta-Type Stirling Engine: A Numerical Study. Iran J Sci Technol Trans Mech Eng 46, 1–13 (2022). https://doi.org/10.1007/s40997-020-00406-0
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DOI: https://doi.org/10.1007/s40997-020-00406-0