New technologies for reuse of existing connecting pipes for HFC air-conditioners

摘要

When HCFC 22 air-conditioner is renewed to HFCs, reuse of existing connecting pipes is big and important demand in field to eliminate money and time for installation of new ones. We worked out a solution to contaminant problems for this demand by new design method of electric driven expansion valve and new method to recover contaminants in connecting pipes using new accelerated during tests, for our residential and commercial packaged air-conditioners.