The Effect of Inner Grooved Tubes on the Heat Transfer Performace of Air-Cooled Heat Exchangers of Co 2 Heat Pump System

@inproceedings{Kaji2014TheEO,
  title={The Effect of Inner Grooved Tubes on the Heat Transfer Performace of Air-Cooled Heat Exchangers of Co 2 Heat Pump System},
  author={R. Kaji and S. Yoshioka and Hirokazu Fujino},
  year={2014}
}
In the CO2 heat pump system, Poly alkyl glycol (PAG) oil is commonly used for lubrication of the compressor, while it is reported that the PAG oil has influence on the heat transfer performance due to its immiscibility against CO2 within its working condition. Experimental work has been carried out to investigate the heat transfer performance of fin and tube heat exchangers using CO2 as a refrigerant with taking PAG oil into account. From previous study it was found that the heat transfer… CONTINUE READING