Method for generating kinetic energy with a thermochemical engine

A method of generating kinetic energy and transferring to an object, the method comprising

• coupling the object to a gas-driven energy transducer of a thermochemical engine that includes
• a reaction chamber comprising a nitrite source inlet, an ammonium source inlet, and a gas outlet,
• a gas-driven energy transducer coupled to the reaction chamber such that a gas produced in the reaction chamber moves the gas-driven energy transducer in a process of exiting the reaction chamber via the gas outlet, and
• a cooler in the form of a heat exchanger;
• providing to the reaction chamber a nitrite source comprising a nitrite ion and an ammonium source comprising an ammonium ion in the presence of water at a reaction temperature of 50 to 150° C.;
• and
• rinsing the reaction chamber by providing to the reaction chamber a wash fluid, and
• cooling the reaction chamber with the wash fluid,
• wherein the nitrite ion and the ammonium ion undergo a chemical reaction to produce a gas and heat which drive the gas-driven energy transducer.