Hydrogen Pump Heat Exchanger Coupling for Convective Loss Recovery

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Solution Overview

Problem

Existing thermo-electrochemical converters face challenges in maintaining high pressure ratios while minimizing convective heat losses, which lead to voltage decay and reduced power generation due to increased fluid flow rates.

Innovation Solution

A thermo-electrochemical converter design with separate chambers operating at different pressures and temperatures, coupled with a fluid handler and a heat exchanger to manage fluid flow and temperature differentials, using an ionizable working fluid and inert carrier fluid to enhance performance and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If increased fluid flow rates are used in the low pressure chamber, then convective heat losses increase, but voltage decay and cell polarization worsen

Engineering Contradiction:

Improvefluid flow rateVSAvoidconvective heat losses

Core Design Contradiction:

SpeedVSLoss of energy

Solution Approach 1:

The patent captures the convective heat losses that would otherwise be wasted and redirects them to preheat the incoming reactant gas. This converts the harmful heat loss into a beneficial heating effect, reducing the temperature differential across the membrane and improving overall system efficiency while maintaining high flow rates for enhanced power density.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Power

If increased hydrogen pressure ratios are used across the membrane electrode assembly, then power density increases, but convective heat losses and voltage decay increase

Engineering Contradiction:

Improvepower densityVSAvoidconvective heat losses

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The system recovers heat from the high-temperature exhaust stream and uses it to preheat the incoming hydrogen-rich reactant gas. This reduces the temperature differential across the membrane electrode assembly, thereby reducing convective heat losses and voltage decay while allowing operation at high pressure ratios for maximum power density.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent implements a heat exchanger that changes the temperature parameter of the reactant gas before it enters the low-pressure chamber. By preheating the gas, the system reduces the temperature differential across the membrane, which directly reduces convective heat losses and allows the system to operate at high pressure ratios without excessive voltage decay.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If cold side temperature is increased, then convective heat losses are reduced, but overall cell voltage decreases

Engineering Contradiction:

Improveconvective heat lossesVSAvoidcell voltage

Core Design Contradiction:

Loss of energyVSPower

Solution Approach 1:

The patent introduces a heat exchanger as an intermediary component between the hot exhaust stream and the incoming reactant gas. This intermediary transfers heat from the exhaust to the reactant gas, effectively reducing the temperature differential across the membrane without requiring an increase in the cold side temperature, thereby avoiding voltage loss while still reducing convective heat losses.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The design achieves improved electrical output and reduced temperature differentials by maintaining optimal temperature balance and fluid flow rates, thereby enhancing the converter's efficiency and performance.

Implementation Method 1

A heat exchanger is in thermal communication with the first and second conduits and is configured to transfer heat from the ionizable working fluid in the first conduit to the ionizable working fluid in the second conduit

Methodology Applied

Scientific EffectHeat transfer: Heat Exchanger

Implementation Method 2

A fluid handler is configured to move the ionizable working fluid from the third chamber to the first chamber through the first conduit

Methodology Applied

Scientific EffectForced convection: Forced Convection

Implementation Method 3

Electric potentials in hydrogen pumps or similar devices, such as the Johnson Thermo-electrochemical Converter (JTEC) or the like, are determined by the Nernst equation

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Data Source

PatentUS20260043389A1Heat exchanger coupling with electrochemical hydrogen pumps using forced convection operation

Publication Date: 2026.02.12 JTEC ENERGY INC

AI summary

A thermo-electrochemical converter includes a working fluid, and first and second membrane electrode assemblies (MEAs). A first chamber is in fluid communication with the first electrode of the first MEA. A second chamber is in fluid communication with the second electrode of the first MEA. A third chamber is in fluid communication with the first electrode of the second MEA. A fourth chamber is in fluid communication with the second electrode of the second MEA. First and second conduits are in fluid communication with the first and third chambers. A fluid handler moves the working fluid from the third chamber to the first chamber through the first conduit. A heat exchanger is in thermal communication with the first and second conduits and is configured to transfer heat from the working fluid in the first conduit to the working fluid in the second conduit.