Method of conversion of heat into fluid power and device for its implementation

A method and apparatus for conversion of heat into liquid fluid power includes at least two hydropneumatic (hp) accumulators, each having a gas reservoir and a liquid reservoir therein separated by a movable separator. Liquid added to a liquid reservoir of a first accumulator causes gas compression in the gas reservoir of the accumulator. Gas is conducted from the first accumulator through a heat exchanger and into a gas reservoir of a second accumulator. Expansion of the gas in the second accumulator causes working liquid to be expelled from the second accumulator. After expansion of the gas in the second accumulator, working liquid is added to the liquid reservoir of the second accumulator gas is conducted through a cooling heat exchanger to the gas reservoir of the first accumulator, causing working liquid to be expelled. The fluid power produced through the expelled working liquid is stored or utilized to operate hydraulic devices.