Jingyuan Xu

Jingyuan Xu
Imperial College London | Imperial · Department of Chemical Engineering

Doctor of Engineering

About

30
Publications
4,776
Reads
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252
Citations
Introduction
My research interest focuses on novel sustainable energy-conversion technologies based on thermoacoustic effects, which involve no harmful ozone-depleting gases, no mechanical moving parts and no electricity power demand, with emphasis on renewable and waste heat. I am passionate about applying my knowledge and expertise in sustainable energy technology to improve energy utilizing efficiency&reduce fossil fuel.
Additional affiliations
September 2018 - present
University of Cambridge
Position
  • PostDoc Position
Education
September 2013 - August 2018
Technical Institute of Physics and Chemistry
Field of study
  • Thermal engineering; Refrigeration and cryogenics; Energy conversion

Publications

Publications (30)
Article
A looped-cascade thermoacoustic driven cryocooler is proposed and theoretically studied in this paper. This system is capable of achieving ideal acoustic fields by employing different-diameter resonance tubes. It overcomes the limitations of current configurations and possesses the advantages of high efficiency, large capacity and compact size. Fir...
Article
Full-text available
Recovering low-grade heat from renewable energy sources and waste heat is crucial for improving energy utilizing efficiency as well as reducing CO2 emissions. Conventional thermoacoustically-driven refrigerators have a high onset temperature and low cooling efficiency, which significant limit their capacity for low-grade heat utilization. This pape...
Article
A small-scale, heat-driven cooling system is required for on-site liquefaction of unconventional natural gas in a distributed station. To meet such demands, we propose a highly efficient heat-driven thermoacoustic cryocooler. This paper presents the experimental results of the proposed system, which is optimized based on previous theoretical analys...
Article
Full-text available
Waste energy recovery is crucial for reducing greenhouse gas emissions and alleviating the increasing demand for central power grids. In the paper, theoretical analyses have been carried out on a novel thermoacoustic combined cooling, heating, and power system for simultaneously recovering waste heat and liquefied natural gas cold energy. The syste...
Article
Thermoacoustic technology is a promising clean energy solution for the recovery of low-grade heat from renewable energy sources and waste heat. Existing methods for simulating thermoacoustic systems are inconsistent or time-consuming. In this study, a time-saving and reliable time-domain lumped acoustic–electrical analogy model is proposed to inves...
Article
We report a two-unit thermoacoustic refrigerator driven by medium- and low-grade thermal energy for the room-temperature cooling. Carefully designed slim tubes and cavities were adopted as an efficient resonance component to further increase the power density of system. Systematic experiments, including onset characteristics, refrigeration performa...
Article
In recent decades, the demands for cooling requirements near liquid-helium temperature ranges, i.e., 4 K, are becoming urgent for the increasing developments in frontier science of aerospace exploration, medical science and superconductivity power. Existing cryocoolers capable of achieving near liquid-helium temperatures contain moving components t...
Article
Full-text available
Energy crisis and environmental pollution have become global issues. This study reported a heat-driven combined cooling and heating system based on thermoacoustic technology, which adopted two units of thermoacoustic engine and cooler cores to improve the efficiency. This system can be used as a refrigerator and a heat pump at the same time. Experi...
Article
A small-scale, energy-efficient and reliable refrigeration system is required for on-site liquefaction of natural gas in distributed stations. The thermoacoustic refrigerator is regarded as one of the most promising options to meet this demand. However, existing work on thermoacoustic refrigerators to date has been limited to a single cooling tempe...
Article
Full-text available
This work investigates a novel heat-driven multi-stage thermoacoustic cooler that can satisfy cooling requirements in the applications of natural gas liquefaction and high-temperature superconductivity. The proposed system consists of a compressor, multiple thermoacoustic units (engines and coolers) coupled by piston-cylinder assemblies. The acoust...
Article
In a thermoacoustic system, the working gas is the carrier for the conversion between thermal energy and acoustic power. It is therefore important to explore the influence of different working gases on the performance of a thermoacoustic refrigerator. A new type of gas–liquid coupled thermoacoustic refrigerator has a lower onset temperature and hig...
Article
Looped multi-stage thermacoustically driven cryocoolers are considered as promising candidates for applications in liquefaction and recondensation of natural gas. This paper introduces a new configuration capable of cascade power amplification, which could achieves kW-class cooling power and high thermal-to-cold efficiency at natural gas liquefacti...
Article
Full-text available
This paper focuses on a 1 kW-class looped three-stage thermoacoustically-driven cryocooler operating at liquefied natural gas temperature. In this configuration, three identical thermoacoustic engines and one pulse tube cooler are connected by different-diameter resonance tubes. Based on thermoacoustic simulation program, the integral system is des...
Article
Full-text available
A compact looped traveling-wave thermoacoustic heat engine (LTTHE) using an assembly of an elastic membrane (EM) and a solid-mass plate (SP) acting as a resonance unit is proposed in this paper. In the novel configuration, the novel resonance assembly substitutes for the traditional resonance tube to reduce the axial size of the system effectively,...
Article
Full-text available
The water-cooled heat exchanger is one of the key components in a pulse tube refrigerator. Its heat exchange effectiveness directly influences the cooling performance of the refrigerator. However, effective heat exchange does not always result in a good performance, because excessively reinforced heat exchange can lead to additional flow loss. In t...
Article
This paper introduces a novel shell-tube water-cooled heat exchanger. In this configuration, each larger-diameter copper tube contains four smaller-diameter copper tubes that act as heat-transfer fins, thereby increasing heat transfer area and creating a uniform gas temperature distribution.Contrast experiments are conducted to investigate the syst...
Article
Large-capacity pulse-tube coolers are considered promising candidates for applications in high-temperature superconductivity technology, small gas liquefiers, and cryogenic storage tanks. This paper introduces a novel shell-tube heat exchanger particularly designed for such a cooler. In one heat-transfer subunit of this configuration, several small...
Article
With increasing demand for liquefied natural gas, high-efficiency and compact facilities are vital for dealing with natural gas liquefaction or boiled-gas recondensation. This study introduces a looped multiple-stage thermoacoustically-driven cryocooler system that operates in the temperature range of natural gas liquefaction and which has good pro...
Article
Full-text available
A novel thermoacoustically-driven pulse tube cryocooler system has been proposed and investigated in this paper. In this configuration, heat engines are incorporated in a loop, and pulse tube coolers are paralleled to the heat engine. It not only realizes the traveling-wave acoustic field but also power recovery for both heat engines and cryocooler...
Article
Optimizing outlet impedance of thermoacoustic cryocooler is one of the key to obtain the best cryocooler performance. In this paper, a thermoacoustic cryocooler with linear motor type phase adjuster is proposed. The linear motor can not only provide a proper phase angle required by a good operation of the thermoacoustic cryocooler, but also convert...
Article
A looped three-stage thermoacoustically-driven cryocooler system is introduced. Based on classic thermoacoustic theory, simulations are performed to investigate the effects of three representative coupling positions (inlet, middle, and outlet) of the resonance tube. The total exergy efficiency is found to depend on the dimensions of the resonance t...
Article
High frequency pulse tube cooler has shown great prospect due to its high power density and high specific power. In this paper, a 300 Hz two-stage pulse tube cooler with random fiber as regenerator material has been numerically investigated. Firstly, the dimensions of the system have been optimized after extensive simulations. With the optimal dime...
Article
Full-text available
In this paper, a 300Hz pulse tube cryocooler (PTC) driven by a double-acting thermoacoustic heat engine (DATHE) has been studied. A double-acting thermoacoustic heat engine incorporates several travelling-wave heat engine units, which are serially connected in a loop. Compared with the conventional thermoacoustic heat engine which involves a travel...
Article
Full-text available
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 cool...
Article
Full-text available
A 300 Hz pulse tube cryocooler (PTC) driven by a three-stage traveling-wave thermoacoustic heat engine (TSTHE) has been proposed and studied in this paper. In the configuration, three identical thermoacoustic heat engine units are evenly incorporated in a closed traveling-wave loop, in which three pulse tube cryocoolers are connected to the branch...

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Projects

Projects (3)
Project
Expansion work is generally wasted as heat in a pulse-tube cryocooler and thus represents an obstacle to obtaining higher Carnot efficiency. Recovery of this dissipated power is crucial to improvement of these cooling systems, particularly when the cooling temperature is not very low. In this project, an efficient cascade cryocooler that is capable of recovering acoustic power is introduced. The cryocooler is composed of two coolers and a displacer unit. The displacer, which fulfills both phase modulation and power transmission roles, is sandwiched in the structure by the two coolers. This means that the expansion work from the first stage cooler can then be used by the second stage cooler.
Project
A small-scale, heat-driven cooling system is required for on-site liquefaction of unconventional natural gas in a distributed station. To meet such demands, we propose a highly efficient heat-driven thermoacoustic cryocooler.
Project
The research project focuses on the recovery, utilization and conversion of renewable and waste in novel thermoacoustic energy systems