抄録
By installing an additional condenser on the air-conditioning machine, a more efficient heat pump system could be operated with HCFC22 and HFC134a without changing mineral lubricant oil. It was shown that COP for cooling operation was improved when operating with HCFC22 and HFC134a. Based on the flow visualization experiment, it would be confirmed that HFC134a and the mineral lubricant oil normally circulate during operation even though they are not dissolved to each other.
