A heat driven thermoacoustic motor coupled to a thermoacoustic refrigerator comprising:
- an elongated acoustic resonator vessel having first and second sides, first and second ends, an interior and exterior, and a pressurized gas contained therein;
- said resonator vessel having half of one acoustical wavelength with a pressure antinode contained therein and located approximately in the middle of said vessel length;
- said heat driven thermoacoustic motor utilizes the portion of the vessel on the first side of the pressure antinode;
- said thermoacoustic refrigerator utilizes the portion of the vessel on the second side of the pressure antinode;
- said heat driven thermoacoustic motor having a large bulbous volume located at the first end of the resonator vessel and coupled to one end of a small diameter tube whose opposite end is smoothly coupled to a larger diameter tube,
- wherein said larger diameter tube having a thermoacoustic motor stack with first and second ends, and
- wherein said larger diameter tube also having a heat exchanger located adjacent to each of the first and second ends of said motor stack, with the second end of the motor stack and the second heat exchanger being located closest to the acoustic pressure antinode;
- wherein said second motor heat exchanger delivers high temperature heat to said second end of the motor stack, and said first heat exchanger removes ambient temperature heat from said first end of motor stack, resulting in the production of acoustic power;
- said thermoacoustic refrigerator comprised of a large bulbous volume located at said second end of the resonator vessel and coupled to one end of a small diameter tube whose opposite end is smoothly coupled to a larger diameter tube,
- wherein said larger diameter tube having a thermoacoustic refrigerator stack with first and second ends, and
- wherein said larger diameter tube also having a heat exchanger located adjacent to each of first and second ends of said refrigerator stack, with the second end of the refrigerator stack and the second heat exchanger being located closest to the acoustic pressure antinode;
- wherein said second refrigerator heat exchanger removes ambient temperature heat from said second end of the refrigerator stack, and said first heat exchanger delivers cold temperature heat to said first end of the refrigerator stack, resulting in refrigeration at a cold temperature;
- said resonator vessel couples the thermoacoustic motor and the thermoacoustic refrigerator together via a short reducer tube,
- wherein the second motor heat exchanger is coupled to the second refrigerator heat exchanger at different tube diameters, with the acoustic pressure antinode contained within the tube reducer, and with the tube reducer carrying acoustic power from the second heat exchanger of the thermoacoustic motor to the second heat exchanger of the thermoacoustic refrigerator;
- and
- wherein the position of the acoustic pressure antinode within the resonator vessel can be adjusted by means of a controllable heat source externally applied to the small diameter tube of the thermoacoustic motor in the region near the large bulbous volume.