The role of the sub-cooler
The role of the sub-cooler is to reduce the temperature of the gas transmitting the acoustic work, so as to facilitate the extraction of the acoustic work and provide power for the thermoacoustic refrigerator. When the DC flow in the loop (Gedeon flow, that is, the time-averaged mass flow along the loop through the regenerator, thermal buffer tube, feedback line, etc.) and the DC flow in the thermal buffer tube are completely suppressed, the secondary cooling The load of the radiator is only the heat leakage along the wall of the heat buffer tube and the heat radiation from the hot-end heat exchanger, so the subcooler can use stainless steel tubes with larger diameters and shorter lengths (that is, smaller heat exchange area). The subcooler in this thermoacoustic engine adopts a similar structure to the main cooler, and the length of the thin stainless steel tube is shortened to 25 mm.