SPIRAL FLIGHTED DOUBLE WALLED HEAT EXCHANGER

摘要

SPIRAL FLIGHTED DOUBLE WALLED HEAT EXCHANGER A heat transfer coil and method of manufacture where a second piece of tubing iswound around a first piece of tubing while the first piece is straight, where the first piece of tubing is then formed to define the overall coil shape, and then the first and second pieces of tubing internally sized by internal pressurization to also force the two pieces of tubing into intimate contact with each other.