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Phase change thermal storage heat transfer enhancement and regenerator performance test

Author: ShenBin
Tutor: LiLongJian
School: Chongqing University
Course: Power Engineering and Engineering Thermophysics
Keywords: Phase change thermal storage Thermal properties of the test Copper foam Heat pipe Accumulator
CLC: TB34
Type: Master's thesis
Year: 2009
Downloads: 697
Quote: 5
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Abstract


Storage technology is to improve energy efficiency and environmental protection is one of the important measures , including phase change thermal storage with high energy storage density , thermal storage temperature changes , etc, and in recent years has become a research hotspot. But domestic phase change thermal storage research focuses on the high-temperature and low-temperature section , concerning the temperature phase change thermal storage technology research and seldom used. Utilization of solar energy , waste heat and waste heat recycling and other areas , the temperature phase change thermal storage technology has broad application prospects , the subject of a phase change material for heat transfer enhancement structure and thermal properties were tested , and the regenerative properties of the corresponding conducted experimental research has important practical engineering significance. Phase change material storage and accumulator structures are major aspects of technology research and development , the two combine to achieve the expected goal of regenerative technologies . This selection erythritol as the temperature phase change thermal storage materials, through thermal conductivity instrument , DSC and other equipment for erythritol and enhanced heat transfer structure thermal parameters were measured, the results showed that erythritol has a phase change properties stability, phase change latent heat , non-toxic and suitable for applications in the temperature field . For phase-change material with low thermal conductivity characteristics, this paper uses phase change material penetration copper foam ways to strengthen the thermal conductivity of the phase change material , and using theoretical methods for the effective thermal conductivity of the two structures were theoretically analyzed , revealing its transfer enhancement thermal mechanism . Combined with the current mature heat pipe technology , the authors designed a heat pipe - copper foam composite phase change thermal storage / heat exchanger. Copper and heat pipes through the foam to enhance heat transfer erythritol capacity accumulator for the storage , heat experiment . To obtain the heat accumulator storage time under different heating water heat power . Confirmed that the accumulator has a good heat storage capacity . Finally , the establishment of a copper foam inside the accumulator - phase change material phase change heat transfer within the composite structure of the physical , mathematical models, and make the corresponding numerical simulation , has been accumulating material in each time period and distribution of temperature change law . By comparison proved the correctness and feasibility of the model and simulation for future similar situations to provide a reference .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Functional Materials
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