Cold calandria is an indispensable part of the cold storage, discharge tube evaporator play an important role in cold storage, cold storage is a method to make artificial refrigeration fixed space reaches a predetermined temperature to facilitate the building of storage items. (1) The discharge tube evaporator good thermal conductivity, aluminum has excellent thermal capacity, the evaporation temperature of the refrigerant and the temperature difference between the surface of the aluminum exclusion would reduce the evaporation temperature will increase, increase energy efficiency of the compressor, reduce energy consumption; ( 2) Light weight, easy installation of cold storage, the weight ratio of aluminum and steel area row, is about one-sixth of Ф38 pipe, easy installation can save a lot of construction investment; (3) a small amount of refrigerant tubes aluminum row, aluminum row using wing piece tube is threaded outer fin structure, the amount of refrigerant charge will be greatly reduced, the refrigerant can save costs; (4) to extend the life of the compressor, the inner row of tubes specially treated to ensure internal clean aluminum row, with anti-corrosion ability of alloy grades, the surface through a special process, long life, while in line with food hygiene standards. (5) cold discharge tube set, high efficiency, projected area and evaporation area than aluminum row can be done one to three or one to four, so aluminum row may all be mounted on the top surface of the refrigerator, so that one can exchange capacity per unit area higher than the use of more energy-efficient wall row, second it has a certain storage effect, frequent operation of the compressor when the starting rate is lowered, save some energy consumption. (6) electric defrost function selection of long-life, high temperature, high insulation level of electrical heating wire, but with a receiving tank, the end of the cold calandria defrost difficult problem. (7) high pressure discharge tube: aluminum fin and tube die cast structure, strength aluminum fins and improved mutual, aluminum pressure has greatly improved.