Abstract: A thermally operated refrigerator includes a hot space absorbing a heat from an outer heat source at a high temperature, an ambient space having a first portion and a second portion, a heat accumulator disposed between the hot space and the first portion of the ambient space for establishing a first fluid circuit in which an amount of operating fluid is filled, a hot displacer whose reciprocal movement establishes a periodical movement of the operating fluid in the first fluid circuit for rejecting the heat absorbed at the hot space to the first portion of the ambient space, a cold space absorbing a heat from a load at a low temperature, a cooler disposed between the cold space and the second portion of the ambient space for establishing a second fluid circuit in which an amount of operating fluid is filled, a cold displacer whose reciprocal movement establishes a periodical movement of the operating fluid in the second fluid circuit for rejecting the heat absorbed at the cold space to the second portion of t

Abstract: A pulse tube refrigerating system includes a first space, a second space, a pulse tube disposed between the first and the second spaces so as to constitute a closed operating space in which an amount of operating fluid is filled, a driving device for establishing opposite phase fluctuations of the operating fluid by an expansion and an compression of the first space and the second space in alternative manner, a first set of a radiator and an accumulator disposed in the pulse tube so as to be located at a side of the first space, a second set of a radiator and an accumulator disposed in the pulse tube so as to be located at a side of the second space, a phase control oscillator disposed in the pulse tube and set to be be vibrated with a phase relative to the fluctuation of the operating fluid, and a control device for controlling the phase of the phase control oscillator relative to the fluctuation of the operating fluid.