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- [1] Performance of a U-vertical Direct-expansion Ground Heat Pump 6TH INTERNATIONAL SYMPOSIUM ON HEATING, VENTILATING AND AIR CONDITIONING, VOLS I-III, PROCEEDINGS, 2009, : 541 - 545
- [3] Performance of a direct expansion ground-source heat pump for air conditioning Proceedings of the International Conference on Power Engineering 2021, ICOPE 2021, 2021,
- [5] HEAT EXCHANGE AND FLUID OF REFRIGERANT IN VERTICAL U-TUBE OF THE DIRECT EXPANSION GROUND-SOURCE HEAT PUMPS 7TH INTERNATIONAL SYMPOSIUM ON HEATING, VENTILATING AND AIR CONDITIONING, PROCEEDINGS OF ISHVAC 2011, VOLS I-IV, 2011, : 908 - 913
- [8] Performance Characteristic Analysis of Double-U Tube Ground-Source Heat Pump System in Winter 6TH INTERNATIONAL SYMPOSIUM ON HEATING, VENTILATING AND AIR CONDITIONING, VOLS I-III, PROCEEDINGS, 2009, : 580 - 586
- [9] The Refrigerant Oil Return Speed Influence on the Design of Vertical U-tube Ground Heat Exchanger in the Direct Expansion Ground-source Heat Pumps 2011 ASIA-PACIFIC POWER AND ENERGY ENGINEERING CONFERENCE (APPEEC), 2011,