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

对于温度低于0ºC的换热器，无法避免结霜问题。一般来说，一些融霜方法已被采用，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，它具有经济上的缺点，因为融霜层消耗的能量仅占除霜过程中总能量的20%，并且需要较长的时间重新启动冷却操作。本文的研究有助于建立利用辐射热能的节能除霜新方法。霜层辐射吸收的最佳辐射波长范围为红外波段。卤素加热器的反射器和灯泡由于涂覆了氧化铝陶瓷的红外线辐射，增加了长波长范围的辐射热强度。解决了辐射热源问题。这种辐射热源使霜层吸收大部分辐射热成为可能，从而大大降低了换热器加热的热损失。因此，本研究提出的除霜方法对于需要除霜操作的制冷系统具有划时代的意义。此外，还利用辐射热源进行霜升华除霜。研究了辐射波长范围、辐射热强度对除霜过程的影响。此外，还研究了利用霜升华进行除霜的辐射热源。本研究提出的除霜方法使除霜操作更加高效，使这种除霜方法更加系统化。

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.