（1）易于积油，传热效果不断下降。
（2）堆叠货物后难以进行热氨冲霜及卫生清理。
（3）占据相当的空间体积。
因此设计冷库排管时，不要设计墙排管，全部设计成顶排管。设计顶排管时，为了冷库的均匀供液及今后对排管冲霜的方便，建议每个单元流程的蒸发面积不宜大于400 Ill ，否则，库内供液难以均匀，降低制冷效果．同时冲霜时间过长，库温波动较大，冲霜期间的滴水量较多．对库内物品的质量，特别是外包装物影响较大。
In the traditional design, both the top-row pipe and the wall-row pipe are usually designed at the same time, but in the actual operation, the wall-row pipe has the following deficiencies: (1) easy to accumulate oil, the heat transfer effect is declining (2) it is difficult to carry out HOT AMMonIA DEFROSTING and sanitary cleaning after stacking the goods (3) occupy a considerable volume of space. Therefore, the design of cold storage row pipe, do not design wall row pipe, all designed to the top row pipe. It is suggested that the evaporation area of each unit flow should not be more than 400ill, otherwise, the liquid supply in the tank is difficult to be uniform and the refrigerating effect is reduced The storage temperature fluctuates greatly, and the amount of water dripping during frost washing has a great influence on the quality of the articles in storage, especially on the outer packaging.
