Pipe Boiler Heat Exchanger Layout for Even Water Cooling
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Solution Overview
Problem
Existing pipe heat exchangers in domestic central heating installations face inefficiencies in heat transfer and risk of material overheating due to uneven water flow and potential scale deposits, particularly affecting the upper sieve wall exposed to high temperatures.
Innovation Solution
A fired heat exchanger design featuring a vertically positioned set of pipe elements with a conical or spherical upper sieve wall prominence that directs water flow symmetrically, combined with a horizontally positioned baffle and a combustion chamber, enhances even water circulation and turbulence, reducing overheating risks and improving heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water flows unevenly around the combustion chamber, then heat exchange efficiency is reduced, but material overheating and scale deposits occur
Solution Approach 1:
The invention introduces an asymmetric element (the prominence) on the upper sieve wall to create symmetric water flow distribution. The prominence breaks the original symmetry of the flat wall, redirecting water flow to achieve uniform distribution around the combustion chamber, thereby preventing localized overheating and scale deposits while maintaining high heat exchange efficiency.
2Ease of manufacture
If the upper sieve wall is flat, then manufacturing is simple, but water flow distribution is uneven causing overheating
Solution Approach 1:
Instead of making the entire upper sieve wall complex, the invention applies a localized feature (the prominence) at a specific position on the wall. This local modification creates the desired symmetric water flow pattern and temperature distribution without significantly increasing manufacturing complexity, as only a portion of the wall requires the prominence structure.
3Speed
If baffle openings are large, then water circulation is enhanced, but heat exchange efficiency decreases
Solution Approach 1:
The invention optimizes the parameters of the baffle openings and prominence geometry to achieve a balance between water circulation speed and heat exchange efficiency. By carefully selecting the size, shape, and position of the prominence and baffle openings, the system achieves enhanced water circulation while maintaining effective heat transfer surfaces, preventing the trade-off between circulation speed and heat exchange efficiency.
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
The design achieves a symmetric and even water flow around the combustion chamber, intensifying cooling of the upper sieve wall, reducing material overheating risks, and enhancing heat exchange efficiency by promoting uniform temperature distribution and turbulence.
Implementation Method 1
The prominence apex pointing down towards the bottom sieve wall directs the flow of liquid symmetrically and evenly in all directions
Implementation Method 2
the heat transferred to the liquid is generated from burning gas or heating oil
Implementation Method 3
a fired heat exchanger of the pipe exchanger group, designed for exchanging heat between gas and liquid
Implementation Method 4
a system of pipe elements transferring hot gas or liquid, fitted in between two sieve walls of a chamber
Implementation Method 5
enhancing heat exchange efficiency by promoting uniform temperature distribution and turbulence
Data Source
Figure 1
Figure 2
AI summary
The fired heat exchanger comprising an outer jacket, which encases a set of vertically running pipe elements anchored in the sieve walls on both ends, a gas combustion chamber positioned over the upper sieve wall, and a baffle mounted crosswise to the pipe elements, with openings through which the pipe elements run, plus liquid, gas, and fume inlet and outlet pipe stubs, is characterised in that the upper sieve wall (2) has a central prominence (7) pointing down towards the bottom sieve wall (3), the baffle (5) has a central opening (6) positioned under the prominence (7) of the upper sieve wall (2), and its circumference matches the circumference of the outer jacket (8).