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

对于温度在0ﾟC以下的换热器来说，结霜问题是不可避免的。通常，在反向制冷循环中已经采用了一些融霜方法，如热气除霜。然而，这些方法都存在很多问题。例如，由于融化霜层所消耗的能量仅占除霜过程中提供的总能量的20%，并且重新启动冷却操作所需的时间较长，因此具有经济上的劣势。本研究对建立利用辐射热能的新型节能除霜方法具有一定的参考价值。最佳辐射波长范围是霜层辐射吸收的红外波长范围。卤素加热器的反射镜和灯泡由于涂覆了氧化铝陶瓷红外线辐射，增加了长波辐射热强度。它解决了辐射热源问题。这种辐射热源使霜层有可能吸收大部分的辐射热，从而极大地降低了换热器加热的热损失。因此，本文提出的除霜方法对于需要除霜运行的制冷系统来说是划时代的一种方法。此外，辐射热源还可用于霜的升华除霜，研究辐射波长范围、辐射热强度对除霜过程的影响。此外，还利用霜层升华的方法研究了除霜过程中的辐射热源。本研究提出的除霜方法使除霜操作更加高效，使这种除霜方法系统化。

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.