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System and process of cooling OTEC working fluid pump motor

A technology of working fluid and pump system, which is applied in the direction of mechanical power generation mechanism, machine/engine, mechanical equipment, etc., and can solve problems such as high corrosion and increased failure

Active Publication Date: 2015-12-16
LOCKHEED MARTIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, this option requires a seawater inlet and outlet (in the case of an internal heat exchanger), or an additional working fluid inlet and outlet to the heat exchanger (in the case of an external heat exchanger) , seawater filter (failure point), extra pump (failure point), extra seal (failure point), and directly uses seawater, which is highly corrosive (increases the possibility of failure)

Method used

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  • System and process of cooling OTEC working fluid pump motor
  • System and process of cooling OTEC working fluid pump motor

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Experimental program
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Embodiment Construction

[0015] Cooling systems and methods are described in OTEC systems in which subcooled working fluid from the working fluid pump outlet is used to cool the working fluid pump motor either directly or indirectly through heat exchange with an auxiliary fluid.

[0016] figure 1 is a schematic diagram of the layout of the OTEC power generation system 100 . The overall construction and operation of an OTEC system is well known to those of ordinary skill in the art. The OTEC system 100 can be deployed in any suitable body of water, such as an ocean, sea, lagoon or freshwater lake, and the like.

[0017] In this embodiment, the system 100 includes an offshore platform 102, a turbine generator 104, a working fluid circuit including an evaporator 110-1, a condenser 110-2, a working fluid pump 114, and the condenser, evaporator A closed loop working fluid conduit 106 fluidly interconnects with the working fluid pump and also extends through the turbine generator 104 . A two-phase worki...

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PUM

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Abstract

A cooling system and process in an OTEC system are described, wherein the sub-cooled working liquid from the working fluid pump outlet is used to cool the working fluid pump motor, either directly or indirectly via heat exchange with a secondary fluid. The heat from the motor that is being rejected into the working fluid just prior to the working fluid flowing to the evaporator helps to alleviate heat duty in the evaporator meaning more potential for the evaporator to create energy. Also, because two-phase evaporators, such as those in an OTEC system, are less efficient than single-phase heat exchangers at single-phase heating, this pre-heating of the working fluid will help the evaporator performance substantially.

Description

technical field [0001] The present disclosure relates to ocean thermal energy conversion (OTEC) systems, and to cooling working fluid pump motors used in OTCE systems. Background technique [0002] In a conventional OTEC system, many components are located below the water line. One such component is a working fluid condenser heat exchanger. Due to the required net positive suction head, the working fluid pump must be located below the condenser, and therefore the working fluid pump must also be located below the water line. [0003] Commercial off-the-shelf (COTS) working fluid pumps are not available for submersion in water. Therefore, the working fluid pump must be located within a pressure vessel to isolate the pump from the marine environment and differential pressure. This complicates heat dissipation. Heat from the motor must be dissipated to keep major working parts such as motor windings, seals, bearings, lubricants and cooling. [0004] The low efficiency of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03G7/05
CPCF03G7/05Y02E10/30F01K17/04F01K25/106
Inventor E·C·詹森B·S·巴尔比尔
Owner LOCKHEED MARTIN CORP