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AUGMENTATION OF DEFROSTING BY USE OF ACTIVATION PHENOMENON OF ICE CRYSTAL WITH IRRADIATED INFRARED RAYS

利用红外线照射下冰晶的激活现象增强除霜效果

基本信息

批准号：
06650249
负责人：
INABA Hideo
金额：
$ 1.54万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650249/
关键词：
Frost Layr Melting Infrared Rays Ice Crystal Absorptance Melted Water Frost Formation Defrost

项目摘要

It cannot be avoided the frosting problem for the heat exchanger whose temperature is below 0ﾟC.In general, some frost melting methods have been used such as the hot gas defrost in the reverse refrigerating cycle. However these methods have many problems. For cxample, it has the economical disadvantage owing to the small ratio of only 20 % of the energy consumed to melt the frost layr to total energy supplied during the defrosting, and it requires longer time to restart the cooling operation. The present research is useful to establish the new energy-saving defrosting method by using of the radiant heat energy. The optimum radiative wavelength range is the infared one for the radiative absorption of the frost layr.The reflector and the bulb of the halogen heater increase the radiant heat intensity of the long wavelength range because it is coated with the alumina ceramics infrared ray radiation. It solves the radiative heat source problem. This radiative heat source makes the frost layr possible to absorb a great part of the radiant heat, as the result, the heat-loss of heating the heat exchanger decreases extremely. Accordingly the defrosting method proposed in the present research is epoch-making one for the refrigeration system requiring defrosting operation. Furthermore, the radiative heat source is also used for defrost by means of the frost sublimation.The present rescarch is to investigate the effect of the radiative wavelength range, radiant heat intensity on defrost process. Moreover, it is also investigated that the radiative heat source of the defrost by means of the frost sublimation. The defrost method proposed in this research makes the defrost operation efficiently and systematize this kind of the defrost method.

对于温度低于0 ℃的换热器，结霜问题是不可避免的，一般采用一些融霜方法，如逆制冷循环中的热气融霜。然而，这些方法存在许多问题。例如，由于融化霜层所消耗的能量与在冷却过程中供应的总能量的比例很小，仅为20%，因此具有经济上的缺点，并且需要更长的时间来重新启动冷却操作。本研究有助于建立利用辐射热能的新型节能除霜方法。最佳辐射波长范围是霜层吸收红外辐射的波长范围，卤素加热器的反射器和灯泡由于涂有氧化铝陶瓷红外辐射，增加了长波长范围的辐射热强度。它解决了辐射热源问题。这种辐射热源使霜层吸收了大部分的辐射热，从而大大减少了加热换热器的热损失。因此，本研究提出的制冷循环方法对于需要连续运行的制冷系统是划时代的方法。此外，还利用辐射热源进行霜升华传热，研究了辐射波长范围、辐射热强度对霜升华传热过程的影响。此外，还利用霜升华的方法研究了霜的辐射热源。本研究所提出的演算法，使演算操作有效率，并使此种演算法系统化。