Flow-Reversing Heating Conduits for Uniform Surface Temperature
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Solution Overview
Problem
Existing fluid conduit systems for heating and cooling, such as those used in ground thawing and concrete curing, suffer from significant temperature gradients due to the progressive reduction in fluid temperature along the conduit, leading to inefficient heat transfer and potential cracking in concrete, as well as high energy wastage and logistical challenges in managing long hoses.
Innovation Solution
A flow reversing apparatus that periodically reverses the direction of fluid flow through the conduit, ensuring that both ends of the conduit are exposed to both the supply and return temperatures equally, reducing temperature gradients and improving heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hot water is circulated through a long conduit in a single direction, then the inlet end of the conduit receives sufficient heat, but the outlet end receives insufficient heat due to progressive temperature reduction of the fluid
Solution Approach 1:
The system periodically reverses the direction of fluid flow through the conduit. During one cycle, fluid flows from inlet end to outlet end; during the next cycle, the direction is reversed. This periodic reversal ensures that both ends of the conduit receive adequate heat over time, eliminating the temperature gradient problem while maintaining continuous heat transfer.
2Area of stationary object
If the conduit is arranged in loops covering a large area, then the entire surface can be heated, but significant temperature gradients are induced across the area
Solution Approach 1:
By periodically reversing the flow direction through the looped conduit, the system ensures that all areas of the surface receive heat from both the inlet and outlet ends over time. This eliminates temperature gradients across the entire heated area while maintaining coverage of the full surface.
3Productivity
If hoses are laid out in back and forth patterns for portable applications, then ground thawing can be achieved, but the hoses must be frequently rearranged to maintain optimal heating distribution
Solution Approach 1:
The periodic flow reversal eliminates the need to physically rearrange hoses to maintain optimal heating distribution. The system achieves uniform ground thawing across the entire area by automatically alternating flow direction, significantly reducing operational complexity while maintaining high productivity.
4Temperature
If the fluid flows slowly through the conduit to maximize heat transfer, then heat distribution improves, but the time required to complete the heating process increases
Solution Approach 1:
The system maintains continuous fluid circulation at optimal flow rates while periodically reversing direction. This ensures that heat transfer efficiency is maintained throughout the entire conduit length over time, completing the heating process faster than slow single-direction flow while achieving uniform temperature distribution.
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 reduces temperature gradients, enhances heat transfer efficiency, minimizes energy wastage, and simplifies the logistical challenges of managing long hoses by maintaining consistent heat delivery across the heated area, thereby improving the quality and strength of concrete and reducing operational costs.
Implementation Method 1
Radiant heat from the fluid passing through the hose is transferred to the surrounding ground or concrete surface
Implementation Method 2
Radiant heat from the fluid passing through the hose is transferred to the surrounding ground or concrete surface
Implementation Method 3
A flow control adapted for operative connection to the supply and return ports of the fluid source, and to the first and second ends of the conduit. The flow control is operative, in a forward mode, to direct fluid from the supply port of the fluid source into the first end of the conduit and from the second end of the conduit to the return port of the fluid source
Data Source
AI summary
A fluid circulating apparatus for warming or cooling a surface includes a pressurized fluid source operative to circulate fluid through a conduit such that a supply fluid moves from a supply port of the fluid source into a first end of the conduit, through the conduit, and from a second end of the conduit to a return port of the fluid supply. A flow control when in a forward mode directs fluid from the supply port into the first end of the conduit and from the second end of the conduit to the return port, and when in a reverse mode directs fluid from the supply port into the second end of the conduit and from the first end of the conduit to the return port. A mode selector is operative to switch the flow control between forward mode and reverse mode.