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Keywords = thermoacoustic engine, thermoacoustic cooler

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19 pages, 6006 KiB  
Article
Porous Cores in Small Thermoacoustic Devices for Building Applications
by Fabio Auriemma, Elio Di Giulio, Marialuisa Napolitano and Raffaele Dragonetti
Energies 2020, 13(11), 2941; https://doi.org/10.3390/en13112941 - 8 Jun 2020
Cited by 21 | Viewed by 2901
Abstract
The thermoacoustic behavior of different typologies of porous cores is studied in this paper with the goal of finding the most suitable solution for small thermoacoustic devices, including solar driven air coolers and generators, which can be used in future buildings. Cores provided [...] Read more.
The thermoacoustic behavior of different typologies of porous cores is studied in this paper with the goal of finding the most suitable solution for small thermoacoustic devices, including solar driven air coolers and generators, which can be used in future buildings. Cores provided with circular pores, with rectangular slits and with arrays of parallel cylindrical pins are investigated. For the type of applications in focus, the main design constraints are represented by the reduced amount of the input heat power and the size limitations of the device. In this paper, a numerical procedure has been implemented to assess the behavior of the different core typologies. For a fixed input heat power, the maximum acoustic power delivered by each core is computed and the corresponding engine configuration (length of the resonator and position of the core) is provided. It has been found that cores with parallel pins provide the largest amount of acoustic power with the smallest resonator length. This conclusion has been confirmed by experiments where additive manufactured cores have been tested in a small, light-driven, thermoacoustic prime mover. Full article
(This article belongs to the Special Issue Applied Thermodynamics and Heat Transfer for Buildings)
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14 pages, 546 KiB  
Article
Numerical Calculation of the Performance of a Thermoacoustic System with Engine and Cooler Stacks in a Looped Tube
by Irna Farikhah and Yuki Ueda
Appl. Sci. 2017, 7(7), 672; https://doi.org/10.3390/app7070672 - 30 Jun 2017
Cited by 16 | Viewed by 7352
Abstract
The performance of a thermoacoustic system that is composed of a looped tube, an engine stack, a cooler stack, and four heat exchangers, is numerically investigated. Each stack has narrow flow channels, is sandwiched by two heat exchangers, and is located in the [...] Read more.
The performance of a thermoacoustic system that is composed of a looped tube, an engine stack, a cooler stack, and four heat exchangers, is numerically investigated. Each stack has narrow flow channels, is sandwiched by two heat exchangers, and is located in the looped tube. In order to provide a design guide, the performance of the system is numerically calculated by changing the following three parameters: the radius of the flow channels in the engine stack, the radius of the flow channels in the cooler stack, and the relative position of the cooler stack. It was found that when the three parameters are optimized, the efficiency of the engine stack reaches 75% of Carnot’s efficiency and the coefficient of the performance (COP) of the cooler stack is 53% of Carnot’s COP, whereas 33% of the acoustic power generated by the engine stack is utilized in the cooler stack. Full article
(This article belongs to the Special Issue Sciences in Heat Pump and Refrigeration)
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