The Experts below are selected from a list of 31599 Experts worldwide ranked by ideXlab platform
Guoyao Yu - One of the best experts on this subject based on the ideXlab platform.
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a free piston stirling Generator integrated with a parabolic trough collector for thermal to Electric conversion of solar energy
Applied Energy, 2019Co-Authors: Guoyao Yu, Yangbin Cheng, Yalei Wang, Shaofei Yu, Zhanghua WuAbstract:Abstract Concentrated solar power (CSP) has attracted increasing attention as a renewable energy source with zero carbon emission. For efficient conversion of the externally concentrated heat, a suitable Electric Generator is crucial. In contrast to the currently widely used steam turbine, the free-piston Stirling Electric Generator (FPSG) features a flexible power range, high reliability, and zero water consumption. To date, most Stirling Electric Generators have been integrated with a parabolic dish concentrator in a dish-Stirling system. However, this configuration faces great difficulties in incorporating thermal energy storage or an auxiliary heating facility. To address this, a trough-Stirling concentrated solar power system, in which the parabolic dish concentrator is replaced with a parabolic trough collector (PTC), might be a good candidate. In this study, a free-piston Stirling Electric Generator integrated with a parabolic trough collector is constructed and tested for solar thermal power generation for the first time, and the performance of the Generator and the overall system are experimentally investigated, with Therminol VP-1 being used as the circulating heat transfer fluid. The preliminary on-sun test results show that a maximum output Electric power of 2008 W with a thermal-to-Electric efficiency of 15% on the free-piston Stirling Electric Generator can be obtained at a heater head temperature of 300 °C, accompanied by a maximum overall efficiency of 3.0%. Loss analysis indicates that the dominant losses are the end loss and cosine loss of the parabolic trough collector, and that heat loss occurs in the heat collection elements and pipelines, thus providing indications as to where further improvements can be made.
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development of a 5 kw traveling wave thermoacoustic Electric Generator
Applied Energy, 2017Co-Authors: Tianjiao Bi, Zhanghua Wu, Limin Zhang, Guoyao YuAbstract:Traveling-wave thermoacoustic heat engine is a new type of external combustion heat engine, which is capable of converting thermal energy to acoustic power with advantage of heat source flexibility, reliability and efficiency. The generated acoustic power will be further converted into Electricity by connecting linear alternator with the engine. This power generation system is called traveling-wave thermoacoustic Electric Generator. In this paper, a new traveling-wave thermoacoustic Electric Generator is proposed, which consists of a multi-stage traveling-wave thermoacoustic heat engine and linear alternators. The engine has several units connected end-to-end by slim resonance tubes to obtain a traveling-wave acoustic field in the reGenerator, which is required by an efficient thermoacoustic heat engine. The alternator is connected as a bypass at the end of each resonance tube. Here, a three-stage traveling-wave thermoacoustic Electric Generator was developed. In the experiments, the maximum Electric power of 4.69kW with thermal-to-Electric efficiency of 15.6% and the maximum thermal-to-Electric efficiency of 18.4% with Electric power of 3.46kW were achieved with 6MPa pressurized helium, 650°C and 25°C heating and cooling temperatures. Additionally, the influence of the Electric capacitance on the system performance was investigated, which may provide some clue to couple the alternator with the engine. So far, this performance is the best one of such type of machines. It is believed that this technology will be suitable for many applications in the energy area, such as solar energy, industrial waste heat and so on.
Zhanghua Wu - One of the best experts on this subject based on the ideXlab platform.
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a free piston stirling Generator integrated with a parabolic trough collector for thermal to Electric conversion of solar energy
Applied Energy, 2019Co-Authors: Guoyao Yu, Yangbin Cheng, Yalei Wang, Shaofei Yu, Zhanghua WuAbstract:Abstract Concentrated solar power (CSP) has attracted increasing attention as a renewable energy source with zero carbon emission. For efficient conversion of the externally concentrated heat, a suitable Electric Generator is crucial. In contrast to the currently widely used steam turbine, the free-piston Stirling Electric Generator (FPSG) features a flexible power range, high reliability, and zero water consumption. To date, most Stirling Electric Generators have been integrated with a parabolic dish concentrator in a dish-Stirling system. However, this configuration faces great difficulties in incorporating thermal energy storage or an auxiliary heating facility. To address this, a trough-Stirling concentrated solar power system, in which the parabolic dish concentrator is replaced with a parabolic trough collector (PTC), might be a good candidate. In this study, a free-piston Stirling Electric Generator integrated with a parabolic trough collector is constructed and tested for solar thermal power generation for the first time, and the performance of the Generator and the overall system are experimentally investigated, with Therminol VP-1 being used as the circulating heat transfer fluid. The preliminary on-sun test results show that a maximum output Electric power of 2008 W with a thermal-to-Electric efficiency of 15% on the free-piston Stirling Electric Generator can be obtained at a heater head temperature of 300 °C, accompanied by a maximum overall efficiency of 3.0%. Loss analysis indicates that the dominant losses are the end loss and cosine loss of the parabolic trough collector, and that heat loss occurs in the heat collection elements and pipelines, thus providing indications as to where further improvements can be made.
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development of a 5 kw traveling wave thermoacoustic Electric Generator
Applied Energy, 2017Co-Authors: Tianjiao Bi, Zhanghua Wu, Limin Zhang, Guoyao YuAbstract:Traveling-wave thermoacoustic heat engine is a new type of external combustion heat engine, which is capable of converting thermal energy to acoustic power with advantage of heat source flexibility, reliability and efficiency. The generated acoustic power will be further converted into Electricity by connecting linear alternator with the engine. This power generation system is called traveling-wave thermoacoustic Electric Generator. In this paper, a new traveling-wave thermoacoustic Electric Generator is proposed, which consists of a multi-stage traveling-wave thermoacoustic heat engine and linear alternators. The engine has several units connected end-to-end by slim resonance tubes to obtain a traveling-wave acoustic field in the reGenerator, which is required by an efficient thermoacoustic heat engine. The alternator is connected as a bypass at the end of each resonance tube. Here, a three-stage traveling-wave thermoacoustic Electric Generator was developed. In the experiments, the maximum Electric power of 4.69kW with thermal-to-Electric efficiency of 15.6% and the maximum thermal-to-Electric efficiency of 18.4% with Electric power of 3.46kW were achieved with 6MPa pressurized helium, 650°C and 25°C heating and cooling temperatures. Additionally, the influence of the Electric capacitance on the system performance was investigated, which may provide some clue to couple the alternator with the engine. So far, this performance is the best one of such type of machines. It is believed that this technology will be suitable for many applications in the energy area, such as solar energy, industrial waste heat and so on.
Limin Qiu - One of the best experts on this subject based on the ideXlab platform.
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A traveling-wave thermoacoustic Electric Generator with a variable Electric R-C load
Applied Energy, 2013Co-Authors: Daming Sun, Kai Wang, Xuhan Zhang, Guo Yishan, Limin QiuAbstract:Abstract A traveling-wave thermoacoustic Electric Generator, which is composed of a traveling wave thermoacoustic engine and linear alternators, is promising in solar power generation and energy recovery due to its high efficiency, high reliability, and capability of utilizing low-grade heat. An equivalent acoustic circuit of a linear alternator is first built and analyzed using electro–mechano-acoustical analogy. It is found that the acoustic coupling of the linear alternators to the traveling-wave thermoacoustic engine is crucial to the performance of the system. A traveling-wave thermoacoustic Electric Generator with a variable Electric R-C load is then constructed and experimentally studied. Both the theoretical analysis and the experimental results show the importance of mechanical and Electrical resonances to the overall performance of the system. Furthermore, the thermal-to-Electric efficiency and the Electric power are found to be proportional to the pressure amplitude and the square of it in front of the piston of the linear alternator, respectively. By optimizing the load impedance, the traveling-wave thermoacoustic Electric Generator has achieved a maximum Electric power of 345.3 W with a thermal-to-Electric efficiency of 9.34% and a maximum efficiency of 12.33% with an Electric power of 321.8 W at around 65 Hz when helium of 3.0 MPa is used as the working gas.
Michael B Petach - One of the best experts on this subject based on the ideXlab platform.
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traveling wave thermoacoustic Electric Generator
Applied Physics Letters, 2004Co-Authors: Scott Backhaus, E Tward, Michael B PetachAbstract:Traveling-wave thermoacoustic heat engines have been demonstrated to convert high-temperature heat to acoustic power with high efficiency without using moving parts. Electrodynamic linear alternators and compressors have demonstrated high acoustic-to-Electric transduction efficiency as well as long maintenance-free lifetimes. By optimizing a small-scale traveling-wave thermoacoustic engine for use with an electrodynamic linear alternator, we have created a traveling-wave thermoacoustic Electric Generator; a power conversion system suitable for demanding applications such as Electricity generation aboard spacecraft.
Hongfei Zheng - One of the best experts on this subject based on the ideXlab platform.
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a two stage traveling wave thermoacoustic Electric Generator with loudspeakers as alternators
Applied Energy, 2015Co-Authors: Huifang Kang, Peng Cheng, Hongfei ZhengAbstract:Abstract This paper presents the design, construction and tests of a traveling-wave thermoacoustic Electric Generator. A two-stage traveling-wave thermoacoustic engine converts thermal energy to acoustic power. Two low-impedance linear alternators (i.e., audio loudspeakers) were installed to extract and convert the engine’s acoustic power to Electricity. The coupling mechanism between the thermoacoustic engine and alternators has been systematically studied numerically and experimentally, hence the optimal locations for installing the linear alternators were identified to maximize the Electric power output and/or the thermal-to-Electric conversion efficiency. A ball valve was used in the loop to partly correct the acoustic field that was altered by manufacturing errors. A prototype was built based on this new concept, which used pressurized helium at 1.8 MPa as the working gas and operated at a frequency of about 171 Hz. In the experiment, a maximum Electric power of 204 W when the hot end temperature of the two reGenerators reaches 512 °C and 452 °C, respectively. A maximum thermal-to-Electric efficiency of 3.43% was achieved when the hot end temperature of the two reGenerators reaches 597 °C and 511 °C, respectively. The research results presented in this paper demonstrate that multi-stage traveling-wave thermoacoustic Electricity Generator has a great potential for developing inexpensive Electric Generators.