50～60年代水产冷库多采用管架式冻结间,60年代以后逐渐改用隧道式冻结间,70年代后期有采用平板式冻结器,国外也有采用液氮、液 CO_2,盐水喷淋的接触式冻结法等,但各有优缺点.管架式冻结间具有结构简单,电耗低,占地面积小等优点,但进出冻劳动强度大、时间较长.我厂的管架式冻结间,管架蒸发器 K 值为15千卡/米~2·时·℃,△t=10℃,即 qF In the 1950s and 1960s, most of the aquatic cold storage plants used tube-shelf freezing rooms. After the 1960s, they gradually switched to tunnel-type freezing rooms. In the late 1970s, flat-panel freezers were used. In foreign countries, liquid nitrogen, liquid CO_2, salt water spray contact Freezing method, etc., but each has its own advantages and disadvantages. Tube-shelf freezing has the advantages of simple structure, low power consumption, small footprint, etc., but labor intensity of entering and leaving the ice, a long time. I plant tube-shelf freezing, Tube rack evaporator K value of 15 kcal / m ~ 2 · when · ℃, △ t = 10 ℃, that qF