Dual Loop Water Cooling for Fuel Cell and Braking
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Solution Overview
Problem
Existing vehicle cooling systems face challenges when integrating water braking, particularly with fuel cell vehicles, as water braking can heat up the cooling system beyond recommended temperatures, limiting its effectiveness and safety.
Innovation Solution
A combined cooling and water braking system with two separate water recirculation loops allows for efficient cooling of the propulsion device while using a separate loop for water braking, preventing high temperatures from affecting the propulsion system, and includes a control unit to manage switching between modes of operation based on input parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water braking is used to reduce wear and maintenance costs, then brake reliability is improved, but the cooling system temperature increases beyond safe limits
Solution Approach 1:
The water cooling system is divided into two separate recirculation loops: a first loop dedicated to cooling the propulsion device and a second loop dedicated to water braking. This segmentation allows each loop to independently manage its thermal load, preventing the high temperatures generated during water braking from affecting the propulsion device cooling.
Solution Approach 2:
A heat exchanger is introduced as an intermediary component between the two water recirculation loops. The heat exchanger enables thermal energy transfer from the second loop (water braking) to the first loop (propulsion device cooling) without direct fluid mixing, allowing the system to utilize the thermal energy from braking while maintaining separate thermal management zones.
2Device complexity
If a single water cooling system is used for both propulsion device cooling and water braking, then device complexity is reduced, but the system cannot maintain safe temperatures during water braking
Solution Approach 1:
The cooling system is segmented into two distinct recirculation loops with separate flow paths, heat exchangers, and control mechanisms. This segmentation increases structural complexity but enables independent thermal management, allowing the system to maintain safe fuel cell temperatures even during water braking operations.
Solution Approach 2:
The system incorporates dynamic switching capabilities through a control unit that can switch between different operational modes (first mode with both loops active for cooling, second mode with second loop isolated for water braking). This dynamic adaptability allows the system to optimize performance and maintain temperature safety across different operating conditions.
3Temperature
If the cooling system is isolated during water braking to maintain safe temperatures, then temperature control is improved, but cooling capacity is reduced
Solution Approach 1:
The heat exchanger serves as a thermal intermediary that enables the second loop (isolated during water braking) to transfer its thermal energy to the first loop. This maintains temperature control in the propulsion device while preserving cooling capacity through thermal energy recovery and transfer between loops.
Solution Approach 2:
The high-temperature water from the water braking operation in the second loop is converted from a harmful thermal load into a beneficial thermal resource. Through the heat exchanger, this thermal energy is transferred to the first loop, enhancing the cooling capacity for the propulsion device and converting what would be waste heat into useful cooling power.
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 solution effectively keeps the propulsion system cool during normal operation and prevents overheating during water braking, ensuring the fuel cell temperature remains within safe limits, enhancing both cooling capacity and safety.
Implementation Method 1
a first water recirculation loop having a first heat exchanger configured to cool water flowing in the first water recirculation loop
Implementation Method 2
a retarder configured to be coupled to a pair of wheels of the vehicle, the retarder being switchable between an inactive state in which it does not affect the rotational speed of the wheels, and an active state in which the retarder causes the rotational speed of the wheels to be reduced
Data Source
AI summary
A combined cooling and water braking system for a vehicle comprises a first water recirculation loop having a first heat exchanger configured to cool water flowing in the first water recirculation loop, the first water recirculation loop comprising a water conduit for transporting heat away from a propulsion device configured to generate a propulsion power for the vehicle. A second water recirculation loop having a second heat exchanger is configured to cool water flowing in the second water recirculation loop. A retarder is configured to be coupled to a pair of wheels of the vehicle. The second water recirculation loop may be selectively used for cooling the propulsion device and for providing water to the retarder for water braking. There is also provided a method for cooling a propulsion device of a vehicle and water braking a pair of wheels of a vehicle.