Fuel Cell Trailer Refrigeration Heat Rejection in High Ambient Air
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Solution Overview
Problem
Existing refrigeration systems for transport face challenges in dissipating waste heat generated by fuel cells, particularly in high temperature ambient conditions, leading to limited operation of the fuel cell power source.
Innovation Solution
The refrigeration system incorporates a radiator and condenser arranged in parallel with a flow of ambient air, with a controller managing coolant flow rate and fan speed to enhance heat rejection, allowing for efficient operation of the fuel cell power source in high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fuel cell is used as an onboard power source to eliminate diesel engine emissions, then environmental performance is improved, but waste heat dissipation becomes difficult especially in high temperature ambient conditions
Solution Approach 1:
The patent combines the condenser and radiator into a single integrated assembly that serves dual functions: refrigeration heat rejection and fuel cell waste heat dissipation. This merged configuration allows both thermal management functions to share common components (housing, fan assembly, coolant circuit), enabling effective heat dissipation while maintaining compact design.
Solution Approach 2:
The condenser-radiator assembly performs multiple functions simultaneously: it acts as both a condenser for the refrigeration cycle and a radiator for fuel cell cooling. The single fan assembly drives air flow through both heat exchangers, and the integrated coolant circuit manages thermal loads from both systems, demonstrating multi-functionality that resolves the heat dissipation challenge.
2Temperature
If a radiator is added to cool the fuel cell, then waste heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent merges the radiator with the condenser into a single integrated assembly, eliminating the need for separate radiators and reducing overall system complexity. The combined unit shares a common housing, fan assembly, and coolant circuit, thereby achieving fuel cell cooling without proportionally increasing device complexity.
Solution Approach 2:
The integrated condenser-radiator assembly serves dual purposes: condensing refrigerant and cooling the fuel cell. This multi-functional design means that adding cooling capability does not require entirely separate systems, thereby limiting the increase in device complexity while achieving the desired thermal management.
3Volume of moving object
If the condenser and radiator are arranged in series, then space utilization is improved, but heat rejection efficiency decreases in high temperature conditions
Solution Approach 1:
The patent transitions from a series arrangement (one after another in the air flow path) to a parallel arrangement (side-by-side configuration). Both the condenser and radiator are positioned to receive air flow simultaneously from the same fan assembly, allowing independent heat rejection paths that maintain efficiency even when one component is thermally loaded.
Solution Approach 2:
The parallel arrangement merges the air flow paths of the condenser and radiator into a unified system driven by a single fan assembly. This configuration allows both heat exchangers to operate independently while sharing common infrastructure, thereby maintaining heat rejection efficiency without sacrificing space utilization.
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 enables effective heat rejection, allowing the refrigeration system to operate the fuel cell at higher ambient temperatures without overheating, thereby maintaining efficient cooling performance.
Implementation Method 1
a radiator and condenser arranged in parallel with a flow of ambient air
Implementation Method 2
a refrigerant compressor, a condenser with one or more associated condenser fans, an expansion device, and an evaporator with one or more associated evaporator fans
Data Source
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AI summary
A refrigeration system comprising a trailer refrigeration unit (30) including a refrigerant circuit through which a refrigerant is circulated and a condenser (34), wherein a fuel cell is configured to generate electrical power for the trailer refrigeration unit (30), a coolant circuit includes a radiator (80) configured to dissipate heat generated by the fuel cell and the condenser (34) and the radiator (80) are positioned such that each of the condenser (34) and the radiator (80) receives a flow of unconditioned ambient air.