Integrated Fuel Cell Heat Pump for Simpler Coolant Routing
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Solution Overview
Problem
Existing fuel cell energy supply systems are complex and costly due to the requirement of separate piping for heat exchangers, which hampers efficiency and cost-effectiveness.
Innovation Solution
An integrated system combining a fuel cell with a heat pump and an external coolant loop that utilizes heat from the fuel cell exhaust to increase the temperature of coolant fluid, which is then directed to the heat pump's evaporator, eliminating the need for a low-grade heat exchanger and enhancing energy efficiency by using a high-grade heat exchanger and bypass valves for controlled heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If separate piping associated with heat exchangers is used in fuel cell arrangements, then heat transfer functionality is achieved, but system complexity and cost increase
Solution Approach 1:
The patent combines the heat exchanger functionality directly into the fuel cell stack assembly by integrating coolant flow passages within the stack structure. This eliminates the need for separate external piping and heat exchanger components, thereby reducing system complexity while maintaining effective heat transfer from the fuel cell exhaust and surrounding components.
Solution Approach 2:
The integrated coolant flow passages serve multiple functions: they cool the fuel cell stack, transfer heat from the exhaust, and provide thermal management for the entire system. This multi-functionality reduces the number of separate components needed, simplifying the overall system architecture while achieving comprehensive thermal management.
2Loss of energy
If separate piping associated with heat exchangers is used in fuel cell arrangements, then heat transfer functionality is achieved, but system cost increases
Solution Approach 1:
The patent combines the heat exchanger functionality directly into the fuel cell stack assembly by integrating coolant flow passages within the stack structure. This eliminates the need for separate external piping and heat exchanger components, thereby reducing system complexity while maintaining effective heat transfer from the fuel cell exhaust and surrounding components.
Solution Approach 2:
The integrated coolant flow passages serve multiple functions: they cool the fuel cell stack, transfer heat from the exhaust, and provide thermal management for the entire system. This multi-functionality reduces the number of separate components needed, simplifying the overall system architecture while achieving comprehensive thermal management.
3Use of energy by moving object
If heat from exhaust is used to increase coolant fluid temperature, then thermal efficiency is improved, but system design complexity increases
Solution Approach 1:
The patent combines the heat exchanger functionality directly into the fuel cell stack assembly by integrating coolant flow passages within the stack structure. This eliminates the need for separate external piping and heat exchanger components, thereby reducing system complexity while maintaining effective heat transfer from the fuel cell exhaust and surrounding components.
Solution Approach 2:
The system uses its own exhaust heat to preheat the coolant fluid before it enters the fuel cell stack, creating a self-sustaining thermal management system. The exhaust, which would otherwise be wasted, automatically serves to heat the coolant, improving thermal efficiency without requiring external energy input or complex control systems.
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 reduces system complexity and cost by increasing thermal efficiency, allowing for higher heat output with lower power input and eliminating the need for a low-grade heat exchanger, thereby enhancing overall energy usage efficiency.
Implementation Method 1
at least one fuel cell that is configured to generate electricity based on an electrochemical reaction
Implementation Method 2
heat from the exhaust increases a temperature of coolant fluid in the first portion
Implementation Method 3
heat from the coolant fluid in the second portion increases the temperature of the evaporator
Implementation Method 4
an evaporator, a condenser, a compressor, and an expansion valve
Data Source
AI summary
An illustrative example system includes at least one fuel cell that is configured to generate electricity based on an electrochemical reaction. The fuel cell includes an exhaust. A heat pump includes an evaporator, a condenser, a compressor, and an expansion valve. A coolant loop is external to the at least one fuel cell. The coolant loop has a first portion associated with the exhaust such that heat from the exhaust increases a temperature of coolant fluid in the first portion. The coolant loop has a second portion downstream of the first portion. The second portion of the coolant loop is associated with the evaporator such that heat from the coolant fluid in the second portion increases the temperature of the evaporator.