(Georgia Institute of Technology, 2008-05)
Desai, S.; Desai, K. P.; Naik, H. B.; Atrey, M. D.
Theoretical modeling of thermodynamic performance plays an important role in the design and development of pulse tube cryocoolers. In the present work, a thermodynamic model of a GMtype double-inlet pulse tube cryocooler has been developed. It includes calculation of ideal refrigeration power, various losses, and hence net refrigeration power. An experimental setup was designed and fabricated to carry out experimental investigations on the GM-type double-inlet pulse tube cryocooler. Experiments were conducted, and the results obtained were used for comparison with the isothermal model developed in the present work. The effect of orifice valve opening, double-inlet valve opening, and frequency on the performance of cryocooler was studied in terms of net refrigeration power and no-load temperature.
(Georgia Institute of Technology, 2008-05)
Mehta, S. M.; Desai, K. P.; Naik, H. B.; Atrey, M. D.
Thermoacoustically driven pulse tube cryocoolers are gaining significant interest in the recent time due to the key advantage of complete absence of moving components for the entire system. The present work gives a simple design procedure for a 300 Hz Standing Wave-Type Thermoacoustic Prime Mover having a parallel plate type stack. The necessary code is written in MATLAB for solving the Rott’s wave equation. The code is validated by comparing the results with those available in the literature. The work further reports the effect of operating and geometrical parameters on the performance of the standing wave-type thermoacoustic prime mover. The system performance, mainly in terms of acoustic power and pressure ratio, is influenced significantly by the operating and geometrical parameters. The operating parameters are heat input, hot end temperature, frequency, filling pressure. The geometrical parameters are the stack length, the stack position, the resonator length and the dimensions of the acoustic amplifier, etc.