Design and construction of a thermoacoustically driven thermoacoustic refrigerator
- Authors: Alcock, A.C. , Tartibu, L.K. , Jen, T.C.
- Date: 2017
- Subjects: Design , Thermoacoustic refrigeration , TADTAR
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/250780 , uj:26139 , Citation: Alcock, A.C., Tartibu, L.K. & Jen, T.C. 2017. Design and construction of a thermoacoustically driven thermoacoustic refrigerator.
- Description: Abstract: This work describes the design and construction of a standing wave Thermoacoustically Driven Thermoacoustic Refrigerator (TADTAR). The thermoacoustic cooler is proposed in this study as an alternative sustainable solution to current issues with vapor compression refrigerators, due to its environmentally friendlier attributes and its solar energy driven capabilities. However, one of the main hindrances to the expansion of this technology is its current lack of efficiency and performance closely related to the designing of the device. Hence, a model has been designed and constructed to perform an experimental investigation of the device’s performance at the University of Johannesburg. This model will mainly be used to investigate the dynamics of the TADTAR arrangement. The TADTAR consists of two thermoacoustic systems namely a thermoacoustic engine coupled to a thermoacoustic refrigerator. The thermoacoustic engine consists of a heat source and a cordierite honeycomb stack which converts heat into acoustic energy. The heat pumping takes place within a thermoacoustic refrigerator. Guidance on the material selection, constraints and calculation of the geometrical configuration describing the device constitute the main contribution of this work
- Full Text:
Experimental investigation of an adjustable thermoacoustically-driven thermoacoustic refrigerator
- Authors: Alcock, A. C. , Tartibu, L. K. , Jen, T. C.
- Date: 2018
- Subjects: Thermoacoustic , Refrigeration , TADTAR
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/281227 , uj:30258 , Citation: Alcock, A.C., Tartibu, L.K. & Jen, T.C. 2018. Experimental investigation of an adjustable thermoacoustically-driven thermoacoustic refrigerator.
- Description: Abstract: An experimental investigation is conducted on a new adjustable thermoacoustically-driven thermoacoustic refrigerator (TADTAR). This refrigerator comprises of a thermoacoustic engine which drives a thermoacoustic refrigerator. This study aims to demonstrate the possibility to alter the TADTAR performance through the adjustment of specific design parameters. An adjustable resonator, which consisted of stacks, spacing couplings and shell-tube heat exchangers was designed and built. Six different honeycomb ceramic stacks were investigated. For each system, three different stack configuration were studied. Measurements of temperature difference across the refrigerator stack and sound pressure levels at steady states were used to determine the performance of the device. Through the adjustment of the length and the insertion of the heat exchanger, the performance of the device with a longer resonator was relatively higher. This study shows that an adjustable resonator successfully alters the frequency output of the thermoacoustic engine to match the frequency required by the thermoacoustic refrigerator and achieve resonance. In addition, this study demonstrates the possibility to change the geometrical configuration of the device and ultimately alter the performance of the TADTAR. Through the adjustment of the length of the resonator, this study shows that a single device could have different operating points. This creates new possibilities to introduce control system able to adjust the geometry of thermoacoustic system while in operation.
- Full Text: