A 1 kW-class multi-stage heat-driven thermoacoustic cryocooler system operating at liquefied natural gas temperature range

A 1 kW-class multi-stage heat-driven thermoacoustic cryocooler system operating at liquefied natural gas temperature range
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在液化天然气温度范围内运行的 1 kW 级多级热驱动热声制冷机系统

DOI:
10.1063/1.4927428
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发表时间:
2015-07
影响因子:
4
通讯作者:
Bi, T.J.
Bi, T.J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wu, Z.H.;Luo, E.C.;Xu, J.Y.;Bi, T.J.

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本文介绍了一种多级热驱动热声制冷机,在液化天然气温区制冷量可达1kW左右,无需任何机械运动部件。该制冷系统由一台声谐振双作用行波热声热机和三台相同结构的脉冲管制冷机组成。与其他传统的行波热声热机不同,声共振双作用热声热机是由三个相同的热声转换单元组成的闭环结构。每个脉管制冷机由一个热声热机单元旁路驱动。该器件在声学上是完全对称的,因此可以实现有效的行波热声转换。实验中,以7MPa氦气为工作气体,当加热温度达到918K时,在110K时获得了0.88kW的制冷量,谐振频率约为55Hz。当加热温度为903 K时,130 K时的最大总制冷量为1.20 kW,热冷效率为8%。与以往的热驱动热声制冷机相比,该装置具有更高的热效率和更高的功率密度。在天然气液化和再冷凝领域具有良好的应用前景。
This article introduces a multi-stage heat-driven thermoacoustic cryocooler capable of reaching cooling capacity about 1 kW at liquefied natural gas temperature range without any moving mechanical parts. The cooling system consists of an acoustically resonant double-acing traveling wave thermoacoustic heat engine and three identical pulse tube coolers. Unlike other traditional traveling wave thermoacoustic heat engines, the acoustically resonant double-acting thermoacoustic heat engine is a closed-loop configuration consists of three identical thermoacoustic conversion units. Each pulse tube cooler is bypass driven by one thermoacoustic heat engine unit. The device is acoustically completely symmetric and therefore “self-matching” for efficient traveling-wave thermoacoustic conversion. In the experiments, with 7 MPa helium gas as working gas, when the heating temperature reaches 918 K, total cooling capacity of 0.88 kW at 110 K is obtained with a resonant frequency of about 55 Hz. When the heating temperature is 903 K, a maximum total cooling capacity at 130 K of 1.20 kW is achieved, with a thermal-to-cold exergy efficiency of 8%. Compared to previously developed heat-driven thermoacoustic cryocoolers, this device has higher thermal efficiency and higher power density. It shows a good prospect of application in the field of natural gas liquefaction and recondensation.
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