Ercang Luo

Bio: Ercang Luo is an academic researcher from Shenzhen University. The author has contributed to research in topics: Heat exchanger & Thermoacoustics. The author has an hindex of 3, co-authored 7 publications receiving 28 citations.

Electricity generating system driven by traveling wave thermoacoustic engine

Abstract: The invention discloses a fluctuation thermoacoustic generation system, which comprises the following loop parts in sequence: cold junction heat exchanger, heat regenerator, heater, heat buffer pipe, hot junction heat exchanger, ring-shaped connection pipe and line generator in the pipe, wherein the generator contains a cylinder with one end of casing on the pipe and the other end with line sliding bearing; a double-loop magnetic-inductive soft iron with ring orifice is set in the cavity between cylinder and casing; the permanent magnet is inserted in the outer ring magnetic wall of soft iron; the coil rack is fixed on cylinder inner wall with part of coil in the ring orifice; the elastic or quality component is set in the hot junction pipe; the quality component does shift sliding along the elastic element; the elastic or quality phase modulation component is set in the greenhouse pipe; the quality component does shift sliding along the elastic phase modulation element. The invention can adjust the phase difference of pressure fluctuation and bulk flow fluctuation, which feedbacks the acoustic power to accomplish high effective Stirling cycle as well as inhibits the loop ring current to improve property of entire machine.

A Traveling Wave Thermoacoustic Refrigerator within Room Temperature Range

Abstract: Thermoacoustic refrigerators use sound waves to generate cooling. Furthermore, they use inert gases that are friendly to the environment. Their unique working mechanism and promising future have attracted many researchers. This article focuses on the design of a traveling wave thermoacoustic refrigerator that works in the civil refrigeration range, since traveling wave refrigerators have higher efficiencies than standing wave refrigerators. According to linear thermoacoustic theory, two analytical methods, the lumped-element network and transfer matrixes, are discussed for analysis of the thermoacoustic systems. Several possible modes for achieving efficient thermoacoustic refrigeration are analyzed with the simplified lumped-element network method. Then, a feasible thermoacoustic refrigeration mode is chosen and optimized with the transfer matrix method. The goal is to achieve a relatively high cooling capacity at a temperature of 250 K. The calculation results show that, with helium, the refrigerator can have a cooling power of 80 W and achieve a COP of 2.86; this corresponds to a relative Carnot efficiency of 57%. According to this, we have constructed a refrigerator. It has achieved a no-load cooling temperature of 263 K when driven by a mechanical compressor with helium, and achieved a cooling power of 80 W at 274 K when driven by a standing wave thermoacoustic engine with nitrogen at the pressure ratio of 1.09.

Non-resonant DC heat exchanger driven by pressure wave

Abstract: This invention relates to non-resonance direct flow heat exchanger the driver of which is pressure wave, it can be used as the exchanger of the cold and heat part on the cross flow thermo system. It includes environment part which is installed in the cross flow freezer or the inlet, outlet part of the cold part's cavity, or the close heat exchanger pipe which is installed in the environment part of the cross flow freezer or the inlet, outlet part of the cold cavity. The closed heat exchanger pipe talked above starts from the pressure cavity ends on the cavity and the first, second single flow valve between the heat exchanger pipe and the inlet, outlet of the pressure cavity. So this make the produce and configuration of the cross flow thermo system is simply. Comparing to the traditional cross flow heat exchanger, this one has obvious strongpoint as fellow, it is suitable to the usage on the high power cross flow thermo system, the stability is high, the power consumption is low, the cost is low, and it adopts the single working liquid.

Oil lub valve-less reciprocating pressure wave generator for backheating refrigerator

Abstract: The present invention relates to an oil lubrication valveless type reciprocating pressure wave generation equipment for regenerative refrigerating machine. It includes oil lubrication valveless type pressure wave generator, first elastic diaphragm positioned in outlet end of pressure wave generator and inlet end of refrigerating machine and third elastic diaphragm positioned in backpressure cavity of pressure wave generator and outlet end of refrigerating machine; the first and third diaphragms are respectively mounted in first and third pressure protection diaphragm boxes, on the box wall of every diaphragm box several small holes are set; the internal cavity of first diaphragm box is divided into two portions by first diaphragm, one portion is communicated with outlet of pressure wave generator cylinder, another portion is communicated with inlet of refrigerating machine; the internal cavity of third diaphragm box is devided into two portions by third diaphragm, one portion is communicated with outlet end of refrigerating machine, another portion is communicated with backpressure cavity of pressure wave generator. The diaphragm can be used for making compression cavity be separted from refrigerating machine, so that it can make all the movement components in the pressure wave generator adopt lubricating oil so as to ensure their long service life and high reliability.

The Prospects of Alternatives to Vapor Compression Technology for Space Cooling and Food Refrigeration Applications

Abstract: This article identifies and describes five alternative cooling technologies (magnetic, thermionic, thermoacoustic, thermoelectric, and thermotunnel) and qualitatively assesses the prospects of each technology relative to vapor compression for space cooling and food refrigeration applications. Assessment of the alternatives was based on the theoretical maximum percent of Carnot efficiency, the current state of development, the best percent of Carnot efficiency currently achieved, developmental barriers, and the extent of development activity. The prospect for each alternative was assigned an overall qualitative rating based on the subjective, composite view of the five characteristics.

Acoustic resonance type traveling wave thermo-acoustic power generating system

Abstract: The invention provides an acoustic resonance type traveling wave thermo-acoustic power generating system. The acoustic resonance type traveling wave thermo-acoustic power generating system is composed of at least three acoustic resonance type traveling wave thermo-acoustic engines, at least one linear motor and resonation tubes. The acoustic resonance type traveling wave thermo-acoustic engines are connected through the resonation tubes in an end-to-end mode to form a loop. Each thermo-acoustic engine unit comprises a main indoor temperature heat exchanger, a heat regenerator, a hot end heat exchanger, a heat buffer tube, a secondary indoor temperature end heat exchanger, one resonation tube and a loop direct-current suppressor. Each linear motor is connected to the corresponding resonation tube and located besides the resonation tube. Compared with the prior art, the acoustic resonance type traveling wave thermo-acoustic power generating system can convert heat energy of different grades into electric energy and has the advantages of being good in reliability, high in efficiency, flexible in power and the like. The acoustic resonance type traveling wave thermo-acoustic power generating system can be applied to the solar energy utilization field, the biomass energy utilization field, the industrial waste heat utilization field and the like and is high in practical value and good in application prospect.

Thermo-acoustic generator

Abstract: The invention discloses a thermo-acoustic generator, which comprises an isotopic heat source, a heat regenerator, a main cold end heat exchanger, an acoustic chamber, an acoustic power feedback tube and a permanent magnet motor. The permanent magnet motor comprises a permanent magnet and a coil surrounding the permanent magnet. The heat regenerator, the main cold end heat exchanger, the acoustic chamber and the acoustic power feedback tube are sequentially communicated. A temperature gradient is formed at the two ends of the heat regenerator by the isotopic heat source and the main cold end heat exchanger. Thermo-acoustic self-oscillation for converting thermal energy into acoustic energy is formed in the heat regenerator, so that self-oscillation acoustic voltage is generated, and the permanent magnet in the permanent magnet motor is driven by the self-oscillation acoustic voltage to reciprocally move to form induced electromotive force in the coil. The acoustic voltage generated by the self-oscillation of the thermo-acoustic generator is used for providing driving force for the movement of the permanent magnet to generate the induced electromotive force, the driving force for the movement of the permanent magnet is provided by the self-oscillation of the thermo-acoustic generator, and the thermo-acoustic generator does not comprise any movement part, so that the thermo-acoustic generator is high in reliability.