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Hu J.Y.,CAS Technical Institute of Physics and Chemistry | Hu J.Y.,Lihan Thermoacoustic Technologies Shenzhen Co. | Zhang L.M.,CAS Technical Institute of Physics and Chemistry | Zhang L.M.,Lihan Thermoacoustic Technologies Shenzhen Co. | And 7 more authors.
Cryogenics | Year: 2014

High-temperature superconductivity power-grid technologies require a highly reliable and efficient cryocooler with cooling power of 100 W to kilowatt level at liquid-nitrogen temperatures to produce cryogenic environments. This paper describes the design of a coaxial Stirling-type pulse tube cryocooler to meet this need. In the designed cryocooler, the regenerator and pulse tube are lengthened to avoid possible temperature inhomogeneity. In an experiment, the azimuthal temperature difference at the middle of the regenerator was less than 30 K. With 7.6 kW electric power input, the cryocooler offers more than 520 W cooling power at 80 K corresponding to a relative Carnot efficiency of 18.2%. When the cooling power was less than 370 W, the efficiency is higher than 20%. © 2014 Elsevier Ltd. All rights reserved.


Hu J.,CAS Technical Institute of Physics and Chemistry | Zhang L.,CAS Technical Institute of Physics and Chemistry | Wang X.,CAS Technical Institute of Physics and Chemistry | Zhu J.,Lihan Thermoacoustic Technologies Shenzhen Co. | And 4 more authors.
Physics Procedia | Year: 2015

Asubstantial fraction of the volume of a traditional pulse-tube cryocooler is occupied by a reservoir, which greatly reduces the specificpower of the cryocooler. This is undesirable for applications that require a small size and light weight.This paper presents aninter-phasing pulse-tube cryocooler conjoining two or more cold fingers via their inertance tubes. Because the volume flow in the cold fingers are elaborately adjusted to make the total volume flow into the junction of the inertance tubes zero, the reservoirs are allowed to be removed. Experimentsdemonstrated that, with an electric input power of 1 kW, the cooling power at 77 K reached 59.8 W, corresponding to a relative Carnot efficiency of 16.8%. Compared with a traditional pulse-tube cryocooler, this cryocooler canachieve the same cooling performance. © 2015 The Authors.


Patent
Lihan Thermoacoustic Technologies Shenzhen Co. | Date: 2014-09-24

The present invention discloses a heat-actuated double-acting traveling-wave thermoacoustic refrigeration system, comprising at least three elementary units, wherein each elementary unit comprises a thermoacoustic engine, a thermoacoustic refrigerator, and a resonance device; the thermoacoustic engine and the thermoacoustic refrigerator comprise a main heat exchanger, a heat regenerator, a non-normal-temperature heat exchanger, a thermal buffer tube, and an auxiliary heat exchange in sequence; the resonance device comprises a sealed housing in which it is equipped with a moving part being in a reciprocating motion, wherein the moving part separates the housing into at least two chambers; the main heat exchanger and auxiliary heat exchanger of each thermoacoustic engine and thermoacoustic refrigerator respectively connects to chambers of different housing, forming a dual-loop structure of gas medium flow. In heating the non-normal-temperature heat exchanger of the thermoacoustic engine to produce acoustic power, thermoacoustic energy conversion is induced inside the thermoacoustic engine and the thermoacoustic refrigerator. Therefore, it is possible to produce refrigeration effect with heat input solely. The system can be applied in areas with abundant thermal energy and absence of electricity, thus being capable of a more extensive range of application.


Patent
Lihan Thermoacoustic Technologies Shenzhen Co. | Date: 2014-05-07

The present invention provides a single-stage double-acting traveling-wave thermoacoustic system, comprising three elementary units, wherein each unit comprises a linear motor and a thermoacoustic conversion device. The linear motor comprises a cylinder and a piston, wherein the piston can perform a straight reciprocating motion in the cylinder. The thermoacoustic conversion device comprises a first heat exchanger, a heat regenerator, a second heat exchanger, a thermal buffer tube and a third heat exchanger connected in sequence, wherein the first heat exchanger and the third heat exchanger of each thermoacoustic conversion device are connected to cylinder cavities of different linear motors respectively, forming a loop structure for flow of a gas medium. The single-stage double-acting traveling-wave thermoacoustic system provided in the present invention comprises a thermal buffer tube and a third heat exchanger, which makes the temperature of the gas medium fed back to the cylinder cavity of another linear motor be close to the room temperature, so as to ensure the piston and the cylinder working at room temperature, thus reducing the manufacturing cost of the single-stage double-acting traveling-wave thermoacoustic system, and extending its service life.

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