Heat Transfer Pipe Projections for Low Reynolds Number Flow
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Solution Overview
Problem
Existing hot water heat transfer pipes face challenges in improving heat transfer performance while minimizing pressure loss, especially in low Reynolds number zones where the flow transitions from laminar to turbulent, due to the limitations of conventional projection heights and shapes.
Innovation Solution
The implementation of hot water heat transfer pipes with projections of specific heights (0.8-2.0 mm) and relative roughness (0.1-0.25 times the inner diameter) on the inner surface, particularly in the low Reynolds number section, enhances heat transfer coefficients while minimizing pressure loss, and strategically placing these projections near the inlet and avoiding high-temperature sections to prevent scaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If projections of height 0.45-0.6 mm are provided inside the heat transfer pipe, then the heat transfer performance is improved, but the pressure loss increases
Solution Approach 1:
The patent changes the projection height parameter from the conventional 0.45-0.6 mm to a larger range of 0.8-2.0 mm. This parameter modification allows the projections to be more effective in agitating fluid and enhancing heat transfer in low Reynolds number flows, while the specific height range is optimized to control the increase in pressure loss
2Temperature
If the inner diameter of the heat transfer pipe is reduced to increase flow speed, then heat transfer performance improves, but pressure loss increases
Solution Approach 1:
The patent applies local quality by providing projections only in specific sections of the pipe where the Reynolds number is less than 7,000 (laminar or transition flow zones), rather than throughout the entire pipe. This localized application enhances heat transfer where needed most while minimizing the overall impact on pressure loss
3Temperature
If projections are provided inside the heat transfer pipe to increase heat transfer surface area, then the coefficient of heat transfer increases, but the pipe coefficient of friction increases
Solution Approach 1:
The patent modifies the projection height parameter to 0.8-2.0 mm, which is larger than conventional heights. This change increases the heat transfer surface area and coefficient of heat transfer more effectively, while the specific parameter range is selected to optimize the balance with friction effects
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 significantly improves heat transfer performance and reduces pressure loss within the pipe, optimizing the overall efficiency of the heat transfer process by enhancing the coefficient of heat transfer and maintaining low pressure loss across various flow conditions.
Implementation Method 1
a fluid such as water flows, that exchanges heat due to the temperature differential between the pipe interior and exterior
Implementation Method 2
agitates the fluid, thereby increasing the coefficient of heat transfer of the heat transfer surface
Implementation Method 3
exchanges heat due to the temperature differential between the pipe interior and exterior
Implementation Method 4
a fluid such as water flows, that exchanges heat due to the temperature differential
Data Source
AI summary
The present invention relates to a hot water heat transfer pipe that exchanges heat between its interior and exterior. A plurality of projections, each having a height in the range of 0.8-2.0 mm or 0.1-0.25 times the inner diameter, is provided in at least one part of an inner surface of a portion of the heat transfer pipe positioned in a section where the Reynolds number of the fluid flowing in the interior is less than 7,000 to improve the heat transfer performance in the low Reynolds number zone and minimize pressure loss inside the pipe.