Inverter Cooling Air Duct Segmentation for Thermal Management
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Solution Overview
Problem
Inverters in PV systems face challenges in achieving optimal and energy-efficient cooling both at full load and partial load conditions, particularly due to uneven cooling air distribution between components like power semiconductors and choke coils, which can lead to inefficient operation and increased energy consumption.
Innovation Solution
The design incorporates an additional air outlet opening in the cooling air duct between components, allowing for reduced cooling air flow in sections with lower requirements, enabling passive convection cooling during partial load operation and optimizing the cooling effect by arranging components along the duct to prioritize heat-intensive areas, thereby reducing fan energy usage and ensuring sufficient cooling without active fan operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling air duct is used for all components, then the structure is simple, but the cooling air distribution is uneven and cannot meet different cooling requirements of different components
Solution Approach 1:
The cooling air duct system is segmented into multiple independent sections, each serving specific components with different cooling requirements. The first section cools power semiconductor components while the second section cools choke coils, allowing customized cooling air flow for each segment based on its thermal needs.
Solution Approach 2:
Different sections of the cooling air duct are designed with different air flow characteristics to match the local cooling requirements of specific components. Power semiconductors receive cooling air with different flow rates than choke coils, optimizing the cooling efficiency for each component type.
2Reliability
If cooling air flow is increased for high cooling requirement components, then cooling effect is improved, but energy consumption increases
Solution Approach 1:
The cooling system provides partial cooling action to different components based on their actual needs. Instead of maximizing cooling air flow to all components, the system delivers appropriate cooling air quantities only where needed, avoiding excessive energy consumption while maintaining sufficient cooling效果.
Solution Approach 2:
The cooling air flow parameters are changed and optimized for different sections of the cooling duct. By adjusting air flow rates and distribution patterns to match component cooling requirements, the system achieves effective cooling while minimizing fan energy consumption.
3Reliability
If cooling air duct is extended to reach all components, then cooling coverage is improved, but pressure loss increases
Solution Approach 1:
The cooling air duct is divided into segments that branch off at different locations, allowing each component to be reached through the most efficient path. This segmentation reduces the total length of ducting required compared to a single extended duct, thereby minimizing pressure losses.
Solution Approach 2:
The cooling air duct system utilizes three-dimensional spatial arrangement to optimize airflow paths. By strategically positioning duct sections and using vertical and horizontal dimensions effectively, the system achieves comprehensive cooling coverage while minimizing duct length and associated pressure losses.
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 effective cooling of all components, reduces fan size and energy consumption, and maintains efficient operation across varying load conditions by leveraging convection for passive cooling, ensuring optimal performance and energy efficiency.
Implementation Method 1
enabling passive convection cooling during partial load operation
Implementation Method 2
The contact of the cooling air flowing in the cooling channel with the components to be cooled
Data Source
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AI summary
The invention relates to an inverter, in particular an inverter for a photovoltaic system, having a housing (1) with at least one chamber (I) and a cooling air duct (9), which is formed in the chamber (I), for carrying ambient air as cooling air for electrical and/or electronic components of the inverter which are arranged along the cooling air duct (9), wherein the cooling air duct (9) is guided through the housing (I) from an air inlet opening (11) to an air outlet opening (17). The inverter is distinguished in that a further air outlet opening (18) which is arranged above the air inlet opening (11) and above the air outlet opening (17) is arranged in the cooling air duct (9) between two of the components which are to be cooled. The invention further relates to a method for cooling an inverter of this kind.