Patent ID: 11905856
Assignee: ORMAT TECHNOLOGIES, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A geothermal district heating (DH) system, comprising:
a) a plurality of DH conduits, each of said conduits extending to a corresponding heat consumer;
b) a fluid circuit through which a geothermal fluid is flowable;
c) at least two heat exchangers, each of said heat exchangers configured to transfer heat directly or indirectly from said geothermal fluid to a first supply of DH-usable water and to a second supply of additional DH-usable water with a total heat influx provided by said at least two heat exchangers to said DH-usable water and to said additional DH-usable water that is sufficiently high to raise a temperature of said DH-usable water and said additional DH-usable water to a predetermined DH-usable temperature without need for any supplemental fossil fuel derived waste heat to be transferred to said DH-usable water and said additional DH-usable water,
wherein a first of the at least two heat exchangers is a vaporizer for vaporizing an organic motive fluid circulating in an Organic Rankine Cycle (ORC) type power plant,
wherein a second of the at least two heat exchangers is a heat exchanger by which said organic motive fluid at a temperature less than its temperature upon exiting said vaporizer transfers heat to said DH-usable water,
wherein a third of the at least two heat exchangers is a water-water heat exchanger by which said DH-usable water at a temperature greater than its temperature prior to being received in said second heat exchanger transfers heat to said additional DH-usable water; and
d) means for delivering said additional DH-usable water through said plurality of DH conduits.