Subterranean Fuel Cell Heater Bottom Stack Heat Loss
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Solution Overview
Problem
Subterranean fuel cell heaters in bore holes face excessive heat loss at the bottom-most fuel cell stack assembly, leading to potential temperature drops below operational thresholds, which can affect their operability and longevity.
Innovation Solution
A plurality of heaters are arranged end-to-end within the bore hole, with the lower heater having a supplemental heater to increase its thermal output, utilizing either fuel-bound energy or electrical energy to maintain the desired temperature, thereby minimizing heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuel cell stack assemblies are positioned in a bore hole to heat the formation, then heat is generated to liberate oil, but the lower-most fuel cell stack assembly experiences excessive heat loss and temperature drop below operational threshold
Solution Approach 1:
The patent applies local quality by providing a supplemental heater specifically for the lower-most fuel cell stack assembly, which experiences different thermal conditions (excessive heat loss) compared to upper assemblies. This localized intervention addresses the specific problem of heat loss at the bottom without affecting other parts of the system.
Solution Approach 2:
The supplemental heater acts as an intermediary device that introduces additional heat to the lower-most fuel cell stack assembly. This intermediary component compensates for the heat loss and maintains the temperature above the operational threshold, mediating between the heat loss problem and the temperature requirement.
2Use of energy by moving object
If fuel cells convert chemical energy to heat and electricity, then energy efficiency is improved, but the lower-most fuel cell cannot receive heat from below and experiences additional heat loss
Solution Approach 1:
The supplemental heater is designed to be self-regulating, automatically activating when the temperature of the lower-most fuel cell stack assembly drops below the operational threshold. This self-service mechanism ensures that the fuel cell maintains adequate temperature without requiring external control systems.
Solution Approach 2:
The system dynamically adjusts the thermal output parameters of the lower-most fuel cell stack assembly by activating the supplemental heater only when temperature drops below the threshold. This parameter change approach maintains energy conversion efficiency while compensating for heat loss through conditional intervention.
3Productivity
If multiple fuel cell stack assemblies are arranged end to end in the bore hole, then heat generation is distributed, but the lower-most assembly lacks thermal feedback from below
Solution Approach 1:
The supplemental heater is pre-installed with the lower-most fuel cell stack assembly, ready to activate when temperature drops below the operational threshold. This preliminary preparation ensures that temperature maintenance is always available, preventing reliability issues before they occur.
Solution Approach 2:
The system incorporates temperature monitoring and feedback control for the lower-most fuel cell stack assembly. When the temperature drops below the operational threshold, the supplemental heater activates in response to this feedback, creating a closed-loop control system that maintains reliability.
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
This configuration ensures that the bottom-most fuel cell stack assembly maintains the necessary temperature, enhancing its operational reliability and longevity by reducing heat loss and preventing temperature drops.
Implementation Method 1
The fuel cells convert chemical energy from a fuel into heat and electricity through a chemical reaction with an oxidizing agent.
Implementation Method 2
Fuel cells that are not located at the bottom of the bore hole are subject to heat from fuel cells that are lower in the bore hole due to heat naturally rising upward through the bore hole.
Implementation Method 3
a supplemental heater to lower the heat loss of the lower-most fuel cell stack assembly in the bore hole
Data Source
AI summary
A plurality of heaters are disposed end to end within a bore hole of a formation where the bore hole extends from an upper end to a lower end such that a lower heater of the plurality of heaters is proximal to the lower end of the bore hole while every other of the plurality of heaters is distal from the lower end of the bore hole. Each of the plurality of heaters includes a fuel cell stack assembly having a plurality of fuel cells which convert chemical energy from a fuel into heat and electricity through a chemical reaction with an oxidizing agent. Each of the plurality of heaters has a thermal output that is less than or equal to a predetermined value except the lower heater of the plurality of heaters which has a thermal output that is greater than the predetermined value.