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A mixed-refrigerant J - T cooler using gas mixture (N_2+CH_4+C_2H_6+C_3H_8) is experimentally investigated in this paper. In the experiment, the influence of different discharging pressure, different sucking pressure and different hotinend temperature of heat exchanger on thermodynamic performance of the J - T cooler have been done experimentally. When working at condition of discharging pressure from 3.0MPa to 6.0MPa and sucking pressure from 0.1MPa to 0.12MPa, the mixed-refrigerant cooler can achieve the temperature of 80K to 82K and thermal efficiency of 10%, 3 to 5 times of pure nitrogen cooler. Consequently,using mixed refrigerant is effective way to improve the thermodynamic performance of J -T cooler.
In the experiment, the influence of different discharging pressure, different sucking pressure and different hot temperature and temperature of heat exchanger on thermodynamic performance of the J-T cooler have been done experimentally. When working at condition of discharging pressure from 3.0 MPa to 6.0 MPa and sucking pressure from 0.1 MPa to 0.12 MPa, the mixed-refrigerant cooler can achieve the temperature of 80K to 82K and thermal efficiency of 10%, 3 to 5 times of pure nitrogen cooler. Therefore, using mixed refrigerant is effective way to improve the thermodynamic performance of J -T cooler.