Supercritical Fluid Heat Exchanger Layout With Local Thermal Modeling
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Solution Overview
Problem
The existing manufacturing process for heat exchangers for supercritical pressure fluid faces challenges in obtaining high-precision data points, leading to low precision in structural parameters and poor performance due to variable physical properties and increased heat acceleration phenomena, especially in complex working conditions.
Innovation Solution
A method and system that utilize boundary conditions to adjust a preliminary framework of the heat exchanger, constructing a machine heat transfer model with a Gaussian regression process and Cokriging method, iteratively refining the framework to achieve a target heat transfer area without requiring a large number of high-precision data points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the overall design method based on average values of inlet and outlet parameters is used, then the design process is simple, but the precision of structural parameters is low and local convective heat transfer performance cannot be reflected
Solution Approach 1:
The heat exchanger flow passages are divided into multiple discrete sections along the flow direction. Each section is independently calculated with its own thermal parameters, allowing local heat transfer performance to be accurately captured while maintaining a systematic design approach.
Solution Approach 2:
The design method transitions from static average parameter calculations to dynamic local parameter calculations. By computing thermal parameters for each discrete section with its specific inlet and outlet conditions, the method adapts to local variations in heat transfer performance throughout the heat exchanger.
2Manufacturing precision
If areas of flow passages are discretized and local convective heat transfer coefficients are calculated, then local heat transfer performance can be reflected, but a large number of high-precision data points are required to construct correlation equations
Solution Approach 1:
Standardized correlation equations for convective heat transfer coefficients are pre-established based on existing experimental data and theoretical models. These pre-built correlations allow local parameters to be calculated directly from geometric and operating parameters without requiring new data collection for each design case.
Solution Approach 2:
Instead of conducting new experiments to obtain high-precision data points for each specific design case, the method uses established correlation equations that have been validated through previous research. These correlations serve as reusable templates that can be applied to various heat exchanger configurations.
3Area of stationary object
If the size of passages in the heat exchanger is reduced, then heat transfer area increases, but the influence of heat acceleration phenomenon significantly increases and prediction precision of existing correlation is reduced
Solution Approach 1:
The design method recognizes that different sections of the heat exchanger have different local characteristics, including varying heat acceleration effects. By calculating local convective heat transfer coefficients for each discrete section rather than using a single average value, the method accurately captures the varying quality of heat transfer across different passage sizes and locations.
Data Source
AI summary
A method and a system for manufacturing a heat exchanger for supercritical pressure fluid are provided. The manufacturing method includes: obtaining boundary conditions of the heat exchanger, adjusting a preliminary framework of the heat exchanger, dividing each of fluid passages along a fluid flow direction and establishing a thermal equilibrium control model, constructing a machine heat transfer model in combination with a Gaussian regression process and a Cokriging method based on the thermal equilibrium control model, determining on-way thermal parameters about the working fluids flowing and transferring heat, determining a heat transfer area according to the on-way thermal parameters, and determining whether the heat transfer area meets a target heat transfer area. If the heat transfer area meets the target heat transfer area the heat exchanger is manufactured according to the preliminary framework of the heat exchanger. If the heat transfer area does not meet the target transfer area, the primary framework of the heat exchanger is readjusted until the heat transfer area meets the target heat transfer area.