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The vortex tube or Raque Hilsch Vortex Tube (RHVT) is a heat pump acts as a cooling machine which utilizes the phenomenon of compressed vortex air flow in the tube. Vortex tube is considered environmentally friendly since it operates without Freon refrigerant. However, it is found that the coefficient of performance refrigeration (COPref) is still low compared to conventional Freon-based cooling machines due to movement of hot and cold air by convection. This research proposes forced cooling in a tube by flowing water to the surface of a hot tube to inhibit convection. The flow rate of water for forced cooling is 3liters/minute. It is known that pressure and fraction are parameters that influence vortex tube performance, so tube type testing is carried out with a pressure variation of 0.5-1.5bar and a fraction of 30%-70%. With the forced cooling method on the vortex tube hot tube, the cold temperatures released were getting colder by 0.9oC until 2.5oC so that the COPref increases up to 45%. The most optimal COPref is -0,123 occurs on forced vortex tube, 0.5bar pressure, and 70% fraction and the most optimal of cold temperature is 13.45oC occurs on forced vortex tube, 1.5bar pressure, and 40% fraction.