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Development of Self-Insulated Gas-to-Gas Heat Exchanger Using Functional Porous Media

使用功能性多孔介质的自绝缘气-气热交换器的开发

基本信息

批准号：
09650248
负责人：
TOMIMURA Toshio
金额：
$ 1.98万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

In the academic year 1997, considering synthetic understanding of heat transfer characteristics for principal parameters and at the same time simplification of numerical calculations, one-dimensional flat plate type of gas-to-gas heat exchanger was designed and fabricated. Fundamental experiments and corresponding one- dimensional numerical calculations were conducted under the conditions of the inlet gas temperature of the high temperature section T_<gho>=400-600ﾟC, the optical thickness of the porous media tau_o=2.6, 6.5, the mean gas velocity of the high temperature section IOTA_<mh>=0.33m/s, and the mean gas velocities of the heat recovery and the low temperature sections IOTA_<mh>=IOTA_<mI>=0.11, 0.22, 0.33m/s, for both the approaching and receding flows. As a result, it is shown that, by adding the heat recovery section, the heat exchanger is effectively insulated, and the effective heat recovery rate H_<eff> of the system is almost doubled. Further, the present heat exchanger is … More shown to have the overall heat transfer coefficient K=20-60W/m^2ﾟC.In the next academic year 1998, cylindrical type of heat exchanger was designed and fabricated. Experiments and simplified calculations based on the results obtained from the flat plate type model were performed for T_<gho>=400-600ﾟC, tau 0=6.5, (IOTA_<mh, > IOTA_<mr, >, IOTA_<mI,>)=(0.10, 0.07, 0.16), (0.07, 0.05, 0.11), (0.05, 0.04, 0.08) m/s. From the experimental and theoretical studies, it is shown that, in the same manner as the case of the flat plate system, the outer wall temperature of the heat exchanger is kept at a low level and favorable H_<eff> is obtained by adding the heat recovery section to the system. In addition, H_<eff> of the cylindrical system is shown to be predicted within 30% error by using proposed simplified calculation method based on the flat plate type model. Furthermore, in the case of lower velocity case of IOTA_<mh> =0.07 or 0.05m/s, it is shown experimentally that H_<eff> of the flat plate system is some 10% higher that that of the cylindrical system. As for the unsteady state characteristics, favorable experimental and theoretical results are also obtained, that is, the present heat exchanger reaches steady state within about 5 to 10 minutes after heating. Less

在1997学年，考虑到对主要参数传热特性的综合认识和数值计算的简化，设计并制造了一维平板式气-气换热器。在高温段入口气体温度T_<gho>=400-600 ℃，多孔介质光学厚度τ_o=2.6，6.5，高温段平均气体速度IOTA_<mh>=0.33m/s，余热回收段和低温段平均气体速度IOTA_<mh>=IOTA_<mI>=0.11，0.22，0.33m/s的条件下，进行了基本实验和相应的一维数值计算。结果表明，通过增加热回收段，换热器得到了有效的绝热，系统的有效热回收率H_<eff>几乎提高了一倍。此外，本热交换器 ...更多信息总传热系数K=20- 60 W/m^2·C。1998年下一学年，设计并制造了圆柱形换热器。在T_<gho>=400-600 ℃，τ_0=6.5，（IOTA_<mh，> IOTA_<mr，>，IOTA_<mI，>）=（0.10，0.07，0.16），（0.07，0.05，0.11），（0.05，0.04，0.08）m/s的条件下，进行了实验和简化计算。实验和理论研究表明，与平板系统相同，在系统中增加热回收段，可使换热器外壁温度保持在较低水平，并获得较好的H_<eff>2。此外，<eff>用所提出的基于平板模型的简化计算方法，对圆柱系统的H_（？）进行了预测，误差在30%以内。在IOTA_<mh>=0.07或0.05m/s的低速情况下，实验表明<eff>平板系统的H_（max）比圆柱系统的H_（max）高10%左右。关于非稳态特性，也获得了有利的实验和理论结果，即本热交换器在加热后约5至10分钟内达到稳态。少