Heat exchanger and method for its manufacture
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Solution Overview
Problem
Existing heat exchangers for high-pressure cleaners are inefficient and costly to manufacture due to the need for specially designed spacers with precise positioning to enhance heat transfer between the inner and outer heating coils.
Innovation Solution
The outer heating coil is configured with varying radial spacings between spacers, allowing for improved heat transfer by altering the radial spacing in specific turn sections, which simplifies the manufacturing process and reduces costs by using identical spacers and eliminating the need for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If spacers are configured with different radial recesses for precise positioning of outer heating coil turns, then heat transfer efficiency is improved, but device complexity and manufacturing cost increase due to requiring multiple specially designed spacers with careful positioning
Solution Approach 1:
The patent applies local quality by creating varying radial spacing of the outer heating coil turns in specific local regions (between spacers) while maintaining uniform spacing in other regions (at spacer locations). This localized variation in turn spacing optimizes heat transfer in critical areas without requiring complex spacers, thereby improving heat transfer efficiency while keeping the device simple and manufacturing cost low.
2Loss of energy
If spacers are configured with different radial recesses for precise positioning, then heat transfer efficiency is improved, but ease of manufacture deteriorates due to requiring specially designed spacers and careful positioning
Solution Approach 1:
The patent achieves improved heat transfer efficiency through local variation in outer heating coil turn spacing rather than through complex spacer design. The spacers remain simple and identical, making them easy to manufacture and install, while the desired heat transfer optimization is achieved by controlling the radial spacing of coil turns in specific regions between the spacers.
3Ease of manufacture
If uniform radial spacing is maintained for all turns of outer heating coil, then ease of manufacture is improved, but heat transfer efficiency deteriorates due to insufficient heat transfer optimization
Solution Approach 1:
The patent resolves this contradiction by maintaining uniform radial spacing at spacer locations (easy to manufacture) while introducing controlled variations in radial spacing in the regions between spacers (optimizes heat transfer). This local differentiation allows the system to achieve both manufacturing simplicity and heat transfer 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
This configuration enhances heat transfer efficiency between heated air and the cleaning liquid, resulting in a more cost-effective and highly efficient heat exchanger.
Implementation Method 1
Heat transfer then takes place from the hot air via the heating coils to the liquid to be heated
Data Source
AI summary
A heat exchanger for heating a liquid is provided, in particular, for high-pressure cleaners, including an inner and an outer heating coil which each have a plurality of turns, and including spacers which are arranged between the inner heating coil and the outer heating coil and are distributed over the circumference of the inner heating coil. To develop the heat exchanger in such a way that it can be manufactured more cost-effectively and is highly efficient, at least one turn of the outer heating coil includes between two spacers immediately adjacent to each other a first turn section in which the radial spacing from the inner heating coil is smaller or larger than in the region of the spacers. Two methods for manufacturing such a heat exchanger are also provided.