Abstract
This chapter presents an investigation on a thermoacoustically driven pulse tube cooler working at 82.5 K. It is an efficient way to increase the performance of the thermoacoustic refrigeration system by improving the frequency matching between thermoacoustic engines and pulse tube coolers (PTCs). Investigation on the performance of the refrigeration system under different operating frequency is carried out by changing the length of the resonance straight tube of a thermoacoustic-Stirling engine. The operating frequency is adjusted by lengthening the resonance tube of the thermoacoutic engine. Experimental results show that the operating frequency can greatly influence the performance of the PTC. With working pressure and heating power of 2.8 MPa and 2500 W, respectively, the PTC obtains the minimum refrigeration temperature of 82.5K, which is a new record for the PTC driven by a thermoacoustic engine. The frequency matching between thermoacoustic engine and pulse tube cooler is of greatest importance to obtain better cooling performance for a pulse tube cooler. It is efficient to adjust the operating frequency by changing the length of the resonance straight tube. A pulse tube cooler driven by a thermoacoustic-Stirling engine with the resonance tubes of 7 m obtains a minimum temperature of 82.5 K at 45 Hz.
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