Variable pitch resistance coil heater
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tubular heaters in heat exchangers face challenges such as increased hydrocarbons and severe fouling due to overheating, leading to performance issues and bulky structures, as they rely on constant pitch resistance coils that fail to optimize heat capacity and temperature profiles effectively.
Innovation Solution
The use of resistance coils with continuously variable pitch or zoned pitches allows for varying watt density along the length of the tubular heater, enabling a tailored temperature profile and reducing overheating by adjusting pitch and diameter configurations to match heat requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If more tubular heaters are provided in the heat exchanger to increase heat capacity rate, then heat generation capability is improved, but device complexity and structure size increase resulting in a bulky structure
Solution Approach 1:
The resistance coil is segmented into multiple portions (first portion, second portion, third portion) with different pitch characteristics. Each portion is responsible for a specific heating zone, allowing the single heater to provide differentiated heating throughout its length, effectively replacing what would otherwise require multiple separate heaters.
Solution Approach 2:
Different portions of the resistance coil are designed with local quality variations - the first portion has a first pitch, the second portion has a second pitch, and the third portion has a third pitch. This allows each local region to optimize heat generation according to specific requirements, with the variable pitch portions providing gradually increasing watt density to prevent overheating in specific zones.
2Ease of manufacture
If constant pitch resistance coils are used in tubular heaters, then manufacturing simplicity is maintained, but overheating occurs leading to increased hydrocarbons and severe fouling at outlet
Solution Approach 1:
The pitch parameter of the resistance coil is changed along its length, transitioning from a first pitch in the first portion to a second pitch in the second portion, and to a third pitch in the third portion. This parameter variation allows control over watt density distribution, preventing overheating at the outlet while maintaining manufacturing feasibility through standardized coil construction methods.
3Reliability
If resistance coils with varying pitch are used to optimize heat distribution, then overheating is prevented and durability is extended, but manufacturing complexity increases
Solution Approach 1:
The resistance coil incorporates dynamic pitch variation where the spacing between coils changes along the length of the heater. The first portion has a first pitch, the second portion has a second pitch, and the third portion has a third pitch, creating a dynamic heat distribution pattern that adapts to the thermal requirements of different zones, preventing overheating and extending durability.
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 enhances heat exchanger performance by reducing size and manufacturing costs, preventing overheating, and extending durability by optimizing heat distribution and reducing fouling, while maintaining efficient heat transfer.
Implementation Method 1
The resistance coil generates heat, which is transferred to the tubular sheath, which in turn heats a surrounding environment or part
Data Source
AI summary
A heater includes a resistance coil, a first conducting pin and a second conducting pin. The resistance coil includes a first end connected to the first conducting pin, and a second end connected to the second conducting pin. The resistance coil defines a first portion adjacent the first end, a second portion adjacent the second end, and a third portion disposed between the first portion and the second portion. At least one of the first, second, and third portions has a continuously variable pitch along its length.