Degassing Vessel Heating Element for Cooling Circuit Boiling Prevention
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Solution Overview
Problem
The boiling of a heat transfer fluid in fluid heat exchange circuits leads to premature erosion of conduits, increasing the risk of liquid leakage and requiring higher coolant flow rates, which in turn increases energy and fuel consumption, particularly in high-thermal-energy components like EGR systems.
Innovation Solution
A heat exchange circuit with a degassing tank and a heating element that allows for rapid pressurization of the cooling circuit, using a liquid pressure sensor and electronic control unit to detect boiling and activate the heating element to prevent cavitation and delay boiling, thereby reducing the need for coolant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant flow rate is increased to prevent boiling in high-thermal-energy components, then boiling risk is reduced, but energy consumption and fuel consumption increase
Solution Approach 1:
The system changes the pressure parameter of the coolant to delay boiling. By increasing system pressure through the pressurization device, the boiling point of the coolant is elevated, allowing the system to maintain reliable boiling prevention without increasing flow rate, thus avoiding additional energy consumption.
Solution Approach 2:
The pressurization device performs preliminary pressurization of the coolant before it reaches high-thermal-energy components. This advance action elevates the boiling point in advance, preventing boiling from occurring in the first place, thereby eliminating the need for compensatory flow rate increases.
2Reliability
If coolant flow rate is increased to prevent boiling, then erosion risk is reduced, but fuel consumption increases
Solution Approach 1:
The system changes the pressure parameter to delay boiling and reduce cavitation erosion. By maintaining higher pressure through the pressurization device, the coolant remains in liquid phase longer, reducing vapor bubble formation and collapse that cause erosion, without requiring increased flow rates that would increase fuel consumption.
3Temperature
If system pressure is increased to delay boiling, then boiling point is elevated, but system complexity increases
Solution Approach 1:
The pressurization device is integrated with the existing degassing jar and thermostat housing, merging multiple functions into a single component. This integration approach elevates the boiling point through pressurization while minimizing the increase in system complexity by utilizing existing structural elements.
Solution Approach 2:
The heating element and pressurization mechanism serve multiple functions: they heat the gas volume to increase pressure, delay boiling, and can potentially serve as a backup heating source. This multi-functionality reduces overall system complexity by eliminating the need for separate dedicated components.
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 delays boiling, reducing the risk of conduit erosion and lowering energy and fuel consumption by maintaining a higher temperature tolerance for the heat transfer liquid, thus optimizing the thermal regulation process.
Implementation Method 1
The degassing jar is equipped with a heating element, the heating element being positioned so as to remain out of the liquid under the intended conditions of use, and being configured to allow the gas above the liquid to be heated directly
Implementation Method 2
the invention proposes rapid pressurization of the entire cooling circuit to limit the risk of boiling in the cooling circuit
Data Source
Figure 1~2
AI summary
The invention relates to a heat-exchange circuit (1) comprising: a circuit of pipes (2) through which a liquid (8) circulates for transporting calories for temperature control; and a degassing vessel (3) connected to the circuit of pipes (2) and designed to reserve an expansion volume in which said liquid is surmounted by a volume of gas (9). The degassing vessel (3) is advantageously provided with a heating element (5, 6), said heating element being positioned so as to remain outside the liquid (8) in the planned conditions of use and being designed so as to allow the gas (9) surmounting the liquid (8) to be heated directly.