Air conditioner evaporator tube type
1.Cooling pipe
A cooling tube is an evaporator used to cool air. Widely used in low-temperature refrigerators, the refrigerant flows and evaporates in the cooling pipe, and the cooled air outside the pipe acts as a heat transfer medium for natural convection.
The biggest advantage of the cooling pipe is that the structure is simple, easy to manufacture, and the dry consumption of the unpackaged food stored in the warehouse is less. However, the heat transfer coefficient of the pipe is low, and the operation is difficult when defrosting, which is not conducive to automation. For the direct cooling system of ammonia, the seamless steel pipe is welded, and the light pipe or the finned tube is used; for the Freon system, the winding piece or the sleeve type copper tube fin tube set is mostly used.
2. Snake tube type tube
The coiled pipe jacking gravity feeding or the ammonia pump feeding liquid can be used; the single row and double row serpentine wall pipe can be used for the lower inlet and outlet ammonia pump liquid supply system and the gravity liquid supply system, for the single coil tube row The tube can also be used for the ammonia pump up and down supply system and the thermal expansion valve supply system.
The advantage of the coiled tube is that the structure is simple, easy to manufacture, the amount of liquid storage is small, and the applicability is strong. The main disadvantage is that the steam generated in the lower part of the pipe can not be taken out in time, and must be discharged after the full length of the pipe, so the heat transfer coefficient is small, and the vapor-liquid two-phase flow resistance is large.
3. U-shaped tube
The commonly used U-shaped tube is composed of two or four layers of smooth seamless steel tubes.
The U-shaped top tube has the advantages of relatively uniform frosting, convenient preparation and installation, and small liquid filling amount, accounting for about 50% of its volume. It is suitable for gravity feeding system and ammonia pump to enter and exit the ammonia refrigeration system in the cold storage. Get a wider range of applications. However, it has more space for occupying the warehouse, and the upper tube is not easy to defrost.