分析冷库温度下降缓慢的两大原因
Analysis of the two main causes of cold storage temperature drops slowly
1、蒸发器中存在较多的空气或冷冻油，传热效果下降
1, evaporator in more air or frozen oil, heat transfer effect
一旦蒸发器传热管内表面附上了较多的冷冻油，其换热系数将会减小，同样，若传热管中存在较多的空气，蒸发器的换热面积减小，其传热效率也会明显下降，库房温度下降速度就随之减缓。
食品冷库
Once attached on the surface of the evaporator heat transfer tube more frozen oil, its heat transfer coefficient will decrease, also, if there is more air in the pipe, the evaporator of the heat exchange area decreases, and its heat transfer efficiency will be significantly lower, the storehouse temperature decreasing speed is slow.
因此，在日常运行维护中，应注意及时清除蒸发器传热管内表面油污和排出蒸发器内的空气，以提高蒸发器传热效率。
In daily operation maintenance, therefore, should pay attention to keep clear of the evaporator heat transfer tube surface oil and discharge the air inside the evaporator, heat transfer efficiency in order to improve the evaporator.
2、蒸发器表面结霜太厚或积尘过多，传热效果下降
2, the evaporator surface frost is too thick or too much dust, heat transfer effect
导致库温下降缓慢的另一重要原因是蒸发器传热效率低，这主要是由于蒸发器表面霜层过厚或积尘过多引起的。
Lead libraries temperature is another important reason for the slow decline in evaporator heat transfer efficiency is low, this is mainly due to the too thickness of evaporator surface frost layer or dust caused by too much.
由于中山冷库蒸发器的表面温度大多低于0℃，而库房湿度相对较高，空气中的水分极易在蒸发器表面结霜，甚至结冰，影响蒸发器的传热效果。
Due to zhongshan refrigerator evaporator surface temperature are lower than 0 ℃, relative humidity and warehouse is higher, the moisture in the air extremely easy in the evaporator surface frost, ice, even influence the effect of heat transfer in the evaporator.
为防止蒸发器的表面霜层过厚，需定期对其进行除霜。下面介绍两种较简单的除霜方法：
In order to prevent the surface of the evaporator frost layer thickness, on a regular basis to defrost. Here are two simpler defrosting method:
①停机融霜。即停止压缩机运转，打开库房门，让库温回升，待霜层自动融化后，再重新启动压缩机。
1) stop defrost. Which stop the compressor operation, and opened the door of storeroom, let the library temperature picks up, after being automatic melting frost layer, then restart the compressor.
②冲霜。将库房中的货物搬出后，直接用温度较高的自来水冲洗蒸发器排管表面，使霜层溶解或脱落。
(2) cream. After the goods out of warehouse, with higher temperature of tap water rinse directly evaporator tube surface, to dissolve frost layer or fall off.
除了结霜过厚会导致蒸发器传热效果不佳外，蒸发器表面因长期未清扫而积尘过厚，其传热效率也会明显下降。
In addition to the frost too thick will lead to poor performance of the evaporator heat transfer, the evaporator surface due to long-term not cleaning the dust too thick, its heat transfer efficiency will be significantly decreased.
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