Plate Heat Exchanger Rigidity Determination via Layered Simulation
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Solution Overview
Problem
Current methods for determining the strength of plate heat exchangers are inefficient due to complex geometries and high computational costs associated with detailed simulations, making it challenging to assess stress distributions and temperature variations effectively.
Innovation Solution
A simplified layer model is used to simulate the temperature distribution and stress in plate heat exchangers, where a metal block represents the profile between separating plates, reducing geometric complexity and allowing for faster calculation of heat transfer and stress distribution, which can be adapted with correction factors to match real conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed three-dimensional simulations are used to determine stress distribution and temperature variations in plate heat exchangers, then measurement precision and reliability are improved, but loss of time and productivity deteriorate due to high computational costs and complex geometries
Solution Approach 1:
The plate heat exchanger is divided into multiple computational layers, each representing a specific depth position. This segmentation allows the complex three-dimensional problem to be broken down into simpler two-dimensional calculations that can be performed more efficiently while still capturing the essential thermal and mechanical behavior at different depths.
Solution Approach 2:
A simplified two-dimensional model is created that copies the essential thermal and mechanical characteristics of the three-dimensional structure. This model uses equivalent thermal conductivities and stress calculation formulas that replicate the behavior of the complex geometry without requiring full three-dimensional computational resources.
2Reliability
If detailed three-dimensional simulations are used to assess strength and failure points, then reliability is improved, but device complexity and computational requirements worsen
Solution Approach 1:
The computational domain is segmented into discrete layers at different depths, with each layer analyzed using simplified two-dimensional stress and temperature calculations. This approach maintains reliability by capturing depth-dependent variations while avoiding the complexity of full three-dimensional modeling.
Solution Approach 2:
The model uses depth-dependent equivalent parameters, including thermal conductivity and stress distribution coefficients that vary with depth. These parameter changes allow the simplified model to accurately represent the complex three-dimensional physics without requiring complex geometry modeling.
3Measurement precision
If complex geometries of heat exchange profiles are fully modeled, then measurement precision is improved, but productivity and ease of manufacture deteriorate due to increased computational burden
Solution Approach 1:
Instead of modeling the complex actual geometry of heat exchange profiles, the invention uses a simplified two-dimensional representation that copies the essential thermal behavior. Equivalent thermal conductivity values are used to represent the effective heat transfer characteristics of the complex profiles, enabling fast calculations while maintaining temperature distribution accuracy.
Solution Approach 2:
The model employs depth-dependent thermal conductivity parameters that capture the varying heat transfer characteristics at different depths without requiring detailed geometric modeling. This parameter-based approach dramatically reduces computational burden while maintaining measurement precision for temperature and stress predictions.
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 approach enables a more efficient calculation of stress distribution and temperature variations in plate heat exchangers, allowing for improved design and production while reducing computational time, thereby enhancing the assessment of strength and potential failure points.
Implementation Method 1
a first amount of heat is introduced into a first surface within the metal block... heat is conducted through the metal block into the separating plates
Implementation Method 2
applying a solder to the surfaces of the separating plates... soldering the profiles to the separating plates
Data Source
Figure 1~3
Figure 4~5
AI summary
In a method for determining the strength of a plate heat exchanger, the internal temperature stresses of the heat exchanger during operation are calculated using a three-dimensional numerical simulation. The strength of the plate heat exchanger is then determined based on these calculated temperature stresses. The method for manufacturing a plate heat exchanger with metal baffles (1) and profiles (2) utilizes this strength determination to define one or more mechanical parameters of the heat exchanger; subsequently, the heat exchanger is manufactured with the parameter(s).