Numerical Simulation of JT valveless 4K JT refrigerator
李 遠鑑, 朱 紹偉 (同済大)
Abstract:A one-dimensional model of the high-pressure-drop heat exchanger in a JT valveless 4 K JT refrigerator is developed to verify a theoretical 42.9% increase in specific cooling capacity over a conventional JT refrigerator under specified operating conditions. Coupled heat transfer and pressure-drop calculations jointly determine the mass flow rate and structural size to satisfy the specified pressure drop and required heat transfer effectiveness. Due to the high sensitivity to initial conditions, a continuation method is introduced to solve the coupled nonlinear system.