Performance analysis on a looped thermoacoustic refrigeration system driven by thermoacoustic engine

YANG Rui; WANG Yi; FENG Ye; JIN Tao

doi:10.11949/j.issn.0438-1157.20161350

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Performance analysis on a looped thermoacoustic refrigeration system driven by thermoacoustic engine

更新时间：2025-11-26

- Performance analysis on a looped thermoacoustic refrigeration system driven by thermoacoustic engine
- CIESC Journal Issue S2, Pages: 298-303(2016)
- 作者机构：
  
  1. 浙江大学制冷与低温研究所,浙江,杭州,310027
  2. 浙江省制冷与低温技术重点实验室,浙江,杭州,310027
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161350
  CLC： B511
- Online First：30 December 2016，
  
  Published：30 December 2016
- 稿件说明：
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YANG Rui, WANG Yi, FENG Ye, et al. Performance analysis on a looped thermoacoustic refrigeration system driven by thermoacoustic engine[J]. CIESC Journal, 2016, (S2): 298-303.
DOI：

YANG Rui, WANG Yi, FENG Ye, et al. Performance analysis on a looped thermoacoustic refrigeration system driven by thermoacoustic engine[J]. CIESC Journal, 2016, (S2): 298-303. DOI： 10.11949/j.issn.0438-1157.20161350.

摘要

热声热机是一种具有高可靠性和环保特性的无运动部件热机。研究对象是一种环路行波热声发动机驱动的热声制冷机，由一个热声发动机单元和一个热声制冷机单元串联成环路组成。高效的行波热声系统要求回热器处在高声阻抗和接近行波的声场中。由于在环路系统中，声场对声阻抗的变化极为敏感，系统中两个回热器的安装位置会极大影响回热器处的声场。为了研究热声核安装位置对系统性能的影响情况，利用DeltaEC对该系统进行了数值模拟，分析了两个热声核在不同安装位置时系统的总能效系数、发动机单元的效率、制冷机单元的能效系数以及两个回热器的平均相位差和声阻抗等。根据计算结果，当制冷机单元回热器沿声功传输方向距发动机单元回热器的距离与环路总长的比值为0.24时，系统可达到最大总能效系数0.45，对应的相对卡诺能效系数是0.13。当该比值的范围在0.21~0.26时，两个回热器的平均声阻抗较大，使系统的总体性能较优。当该比值大于0.26或小于0.21时，制冷机单元回热器和发动机单元回热器的性能都会恶化，造成了系统整体性能的不佳。

Abstract

Thermoacoustic heat engine is a type of energy conversion machine with the merits of high reliability and environmental friendliness.The present work focuses on a looped travelling-wave thermoacoustic refrigerator with one thermoacoustic engine stage and one thermoacoustic refrigerator stage

connected by resonators.The required acoustic field for an efficient travelling-wave thermoacoustic system is featured by high acoustic impedance and appropriate phase relation close to travelling wave in the regenerator.In the presented thermoacoustic refrigerator

the installation positions of the regenerators could dramatically affect the acoustic field inside them

due to the fact that the acoustic field is highly sensitive to the variation in acoustic impedance.In order to investigate the effect of the installation locations of the thermoacoustic cores on the performance of the thermoacoustic refrigerator

the looped travelling-wave thermoacoustic refrigerator is simulated with DeltaEC

which is a software widely used for the simulation of thermoacoustic systems.In the simulation

the working fluid is helium at a mean pressure of 3 MPa

and the heating temperature and the cooling temperature are 227℃ and 0℃

respectively.The overall coefficient of performance of the whole system

the efficiency of the engine stage

the coefficient of performance of the refrigerator stage

the acoustic impedance and the phase difference in the two regenerators with different installation positions of the two regenerators have been analyzed.According to the simulation results

when the ratio of the distance from the engine's regenerator to the refrigerator's regenerator in the direction of the acoustic wave to the loop length is 0.24

the maximum overall coefficient of performance can be reached

corresponding to a relative Carnot overall coefficient of 0.13.When the ratio is within 0.21-0.26

the two regenerators can both achieve efficient thermoacoustic conversion

leading to high performance of the whole system.However

when it is larger than 0.26 or smaller than 0.21

the performance of the two regenerators will deteriorate

leading to poor performance of the whole system.

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