A combined cooling and power cogeneration system by coupling duplex free-piston stirling cycles and a linear alternator

Sun, Yanlei; Luo, Kai; Hu, Jianying; Luo, Ercang; Wu, Zhanghua; Zhang, Limin; Gao, Yu; Jia, Zilong; Zhou, Yuan

doi:10.1016/j.ijrefrig.2020.04.034

Cited by 20 publications

(7 citation statements)

References 10 publications

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“…The Nlog ΙΙ code uses two different assumptions to calculate the required power in the Stirling refrigerator, according to chamber wall types. The assumption for the walls with the regenerative type is presented in Equation (32):…”

Section: Pv ¼ Mrt ð20þmentioning

confidence: 99%

“…The system is also known as the duplex Stirling refrigerator with many advantages, such as high reliability, high efficiency, compactness, 24 low operating costs, low noise, low emission in comparison with other similar vapor compression units, 27 and promising technology for cogeneration systems driven by waste heat. 32 Compared with a free-piston Stirling engine, typical duplex Stirling systems are more complicated. The main innovations of this study are the theoretical and experimental investigation of heat-to-cool Gamma-type duplex Stirling refrigerator to produce cooling power directly from a renewable or fossil heat source continuously.…”

Section: Introductionmentioning

confidence: 99%

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A novel Gamma‐type duplex Stirling system to convert heat energy to cooling power: Theoretical and experimental study

2021

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This article aims at coupling two Stirling machines together to produce cooling power from different heat sources. Two identical Gamma-type ST500 Stirling machines are coupled together. The first machine, named Stirling engine, is powered by burning natural gas and an electrical power supply as an auxiliary starter. The Stirling engine is connected to a second Stirling machine named Stirling refrigerator by a mechanical belt. The driving force is transferred to the Stirling refrigerator using the mechanical belt. Mechanical energy is then converted to cold energy in the Stirling refrigerator. This study presents the experimental and theoretical results by examining the whole system named duplex Stirling refrigerator system. Five experiments are performed on the system at different pressures to evaluate the results. Water circulation in copper coils is used to determine the cooling flux produced by the Stirling refrigerator. Finally, the coefficient of performance (COP) is calculated. The experimental data are validated using a MATLAB-based code developed based on the presented formulas in this study. The results show that the system's maximum COP and electrical efficiency, consisting of two similar 500 W Gamma-type Stirling machines, are between 0.21% and 70.8%, respectively. Setup theoretical and experimental efficiencies are 0.24 and 0.21, respectively, at the best case.The experimental results of the duplex Stirling refrigerator system used in this study are compared with the simulation results. Finally, the experimental results of this study are compared with some other reported results from different authors on the subject of the duplex Stirling refrigerator.

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Section: Pv ¼ Mrt ð20þmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel Gamma‐type duplex Stirling system to convert heat energy to cooling power: Theoretical and experimental study

2021

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“…These existing reports revealed that the Stirling machines feature high efficiency and simple mechanical mechanisms. Unfortunately, so far there is no tri‐generation system developed except for the cooling and power cogeneration system presented in Reference 17. In these circumstances, to fill the knowledge gap, this study is focused on the development of a compact tri‐generation system based on the combination of Stirling engine and Stirling cooler whose overall volume can be significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, performance in terms of compression ratio, heat input, and cooling load was investigated. More recently, Sun, Luo, Hu, et al 17 have demonstrated a thermoacoustic duplex Stirling cogeneration system where a linear alternator was adopted to couple the engine and refrigerator. In their experiment, 230-W cooling power at À20 C and 6-W electrical power were achieved at a heating temperature of below 190 C. Bellos and Tzivanidis 18 investigated a solar-fed tri-generation where the organic Rankine cycle (ORC) machine was used as the prime mover and driven by parabolic trough solar collectors.…”

Section: Introductionmentioning

confidence: 99%

“…However, to the best of the authors' knowledge, these systems are typically complicated and have a large overall volume. The Stirling machines have been proven effective in power generation systems, [5][6][7][8] duplex Stirling systems, [15][16][17] CHP systems, [20][21][22] and refrigeration systems. [25][26][27] These existing reports revealed that the Stirling machines feature high efficiency and simple mechanical mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Development of tri‐generation system combining Stirling cooler and Stirling engine

Cheng

Huang

2021

Intl J of Energy Research

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Summary This study is aimed at developing a tri‐generation system that converts a thermal energy source to mechanical power, cooling. and heating simultaneously for the residential houses or factory buildings. The approach is implemented by combining a Stirling cooler and a Stirling engine. The input thermal energy is converted into mechanical power by the Stirling engine. A part of the mechanical power is utilized by an external load, and the remaining part of the mechanical power is used to drive the Stirling cooler to provide a cooling effect. In addition, the heats rejected by both the devices are used for water heating. In this study, a theoretical model including thermodynamic and dynamic analyses is developed to predict the performance of the combined system. For validation, a Stirling cooler and a Stirling engine are built and connected, and experiments are conducted to partially demonstrate the feasibility of the present approach. The results show that the experiments closely agree with the numerical predictions for the variations in the cold head temperature of the cooler and the stable rotation speed of the combined system. According to the energy flow analysis, the overall efficiency of the tri‐generation system can reach approximately 91%.

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Oscillatory flow power cycles

2023

Power Generation Technologies for Low-Temperature and Distributed Heat

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A combined cooling and power cogeneration system by coupling duplex free-piston stirling cycles and a linear alternator

Cited by 20 publications

References 10 publications

A novel Gamma‐type duplex Stirling system to convert heat energy to cooling power: Theoretical and experimental study

A novel Gamma‐type duplex Stirling system to convert heat energy to cooling power: Theoretical and experimental study

Development of tri‐generation system combining Stirling cooler and Stirling engine

Oscillatory flow power cycles

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