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counterflow heat exchanger
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    Results indicate that methane can be steadily converted in high efficiency when counterflow heat exchanger and surface catalytic combustion were adopted.
    计算结果表明,同时采用逆流换热和表面催化燃烧可以实现常规方法无法实现的甲烷稳定、高效转变。
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  counterflow heat exchanger
The two regenerators are replaced by one counterflow heat exchanger.
      
The 3 He separator is basically a small copper counterflow heat exchanger.
      
A counterflow heat exchanger serves as the system heat sink.
      


The uniformity of temperature difference field(TDF) is studied for parallel flow and counterflow heat exchanger. Quantitative relationship of the nonuniformity factor of TDF to heat transfer effectiveness is presented. It coincides well with the numerical results of related reference. It can be concluded that, the more uniform the TDF in heat exchanger, the higher the heat transfer effectiveness for the given number of heat transfer units and heat capacity rate ratio....

The uniformity of temperature difference field(TDF) is studied for parallel flow and counterflow heat exchanger. Quantitative relationship of the nonuniformity factor of TDF to heat transfer effectiveness is presented. It coincides well with the numerical results of related reference. It can be concluded that, the more uniform the TDF in heat exchanger, the higher the heat transfer effectiveness for the given number of heat transfer units and heat capacity rate ratio. The procedure is validated.

结合顺、逆流换热器,对温差场的均匀程度进行了研究.提出了传热效能与温差场不均匀因子之间的关联式,该式的计算结果与有关文献数值计算的结果符合较好.在相同传热单元数和热容量流比的情况下,换热器的温差场越均匀,其传热效能越高,验证了温差场均匀性原则的正确性.

The fresh air ventilator is an important equipment of air's quality regulating. In the paper, the basic configuration, operational principles and use characteristic of two types of heat exchangers are dissertated. On the other hand, a new type of counterflow heat exchanger is recommended and the heat exchanger's framework and characteristic are discussed. The paper will be offer the technic reference of engineering.

新风换气机是调节空气品质的重要设备 ,换热器是新风换气机的关键部件。本文论述了目前在新风换气机中采用的两种高效换热器的基本结构、工作原理及其使用特点 ;同时介绍了一种新型逆流板翅式换热器 ,并对该型换器的结构及其特点进行了分析 ,为新风换气机中换器的设计提供了工程技术储备。

In this paper was preformed numerical simulation of catalytic combustion of CH4 for micro-burner with counterflow heat exchanger using both FLUENT and surface chemistry subroutine DETCHEM. The reactions at catalytic surface were considered in calculations only. Stoichiometric ratio of fuel-air mixture is 0.4. Convection heat exchange has adopted as a boundary condition of external surface. Results indicate that methane can be steadily converted in high efficiency when counterflow heat exchanger...

In this paper was preformed numerical simulation of catalytic combustion of CH4 for micro-burner with counterflow heat exchanger using both FLUENT and surface chemistry subroutine DETCHEM. The reactions at catalytic surface were considered in calculations only. Stoichiometric ratio of fuel-air mixture is 0.4. Convection heat exchange has adopted as a boundary condition of external surface. Results indicate that methane can be steadily converted in high efficiency when counterflow heat exchanger and surface catalytic combustion were adopted.

本文联合使用CFD软件FLUENT和化学反应动力学软件DETCHEM对甲烷-空气混合物在有逆流换热的微燃烧器内的催化燃烧进行了数值模拟。计算中只考虑了甲烷在催化表面上的反应。燃料-空气混合物的当量比为0.4,燃烧器外壁面与环境采用对流换热边界条件。计算结果表明,同时采用逆流换热和表面催化燃烧可以实现常规方法无法实现的甲烷稳定、高效转变。

 
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