Patent ID: 11874022
Assignee: HAMFOP TECHNOLOGIES LLC
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC H  F  Y | IPC F

Claim 14:
15. A heat-activated multiphase fluid-operated pump for heating a building, comprising:
an evaporator, located underground at a substantially constant earth temperature serving as a heat source, and containing a working fluid receptive of heat to convert a liquid phase of the working fluid into a vapor phase of the working fluid;
a pressure-control safety valve coupled to an exit port of the evaporator and maintaining the working fluid in the evaporator at a set target pressure and allowing the vapor phase of the working fluid to escape through the exit port whenever the set target pressure is exceeded;
a liquid-piston chamber coupled to the pressure-control valve to receive the vapor phase of the working fluid from the evaporator at the set target pressure, the vapor phase of the working fluid expanding adiabatically and displacing liquid within the liquid-piston chamber, expelling the displaced liquid therefrom in a pumping stage of a thermodynamic cycle;
a unidirectional pump-exit check valve coupled to a second exit port of the liquid-piston chamber to allow the displaced liquid to exit the liquid-piston chamber;
a unidirectional liquid suction-entry check valve coupled to a return port of the liquid-piston chamber;
a heat exchanger coupled to the unidirectional pump-exit check valve and to the unidirectional suction-entry check valve to receive the displaced liquid and allow it to return to the liquid-piston chamber in a suction stage of the thermodynamic cycle, the heat exchanger located in one or more rooms of a building to radiate heat thereto; and
a unidirectional injector return check valve coupled to both a first exit port of the liquid-piston chamber and to an input port of the evaporator, wherein periodic pressure pulses of a liquid phase of the working fluid from the liquid-piston chamber that temporarily exceed the pressure in the evaporator facilitate jets of the liquid phase of the working fluid to return to the evaporator in successive brief spurts.