Nested Multilayer Thin Film Evaporator for Heat Transfer Area
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Solution Overview
Problem
The existing thin film evaporators have limited total heat transfer area due to their design constraints, which restricts their efficiency in steam heating processes.
Innovation Solution
A multilayer thin film evaporator design featuring a three-layer evaporation cylindrical core arranged in a nested manner within a housing, with a rotary rack spindle and motor component to enhance heat transfer by increasing the surface area through a nested cylindrical structure and optimized channel configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single-layer evaporator design is used, then the structure is simple, but the total heat transfer area is limited
Solution Approach 1:
The patent applies the nesting principle by arranging three evaporator cylinders in a nested configuration where the first evaporator cylinder is positioned inside the second evaporator cylinder, and the second evaporator cylinder is positioned inside the third evaporator cylinder. This nested structure allows multiple heat transfer surfaces to occupy a compact spatial footprint, significantly increasing the total heat transfer area without proportionally increasing the device's external dimensions or structural complexity
Solution Approach 2:
The patent transitions from a single-layer two-dimensional heat transfer surface to a three-layer three-dimensional nested structure. By adding the vertical nesting dimension, the design creates multiple evaporation surfaces (inner cylinder surface, middle cylinder surface, outer cylinder surface) that simultaneously contribute to heat transfer, effectively multiplying the heat transfer area within the same horizontal footprint
2Area of stationary object
If the cylinder diameter is increased to enlarge heat transfer area, then the heat transfer area increases, but the height of the evaporator is limited
Solution Approach 1:
Instead of increasing the cylinder diameter horizontally, the patent nests multiple cylinders vertically within each other, allowing the heat transfer area to expand in the radial nesting direction rather than requiring increased height. The nested arrangement enables three distinct heat transfer surfaces to coexist within a compact vertical envelope
3Area of stationary object
If the evaporator height is increased to enlarge heat transfer area, then the heat transfer area increases, but the drive spindle rigidity requirement increases
Solution Approach 1:
The nested cylinder configuration allows the evaporator to achieve increased heat transfer area without increasing the overall height that would require a longer drive spindle. The nested structure concentrates the heat transfer surfaces in a compact vertical arrangement, maintaining shorter spindle lengths and thus preserving drive spindle rigidity
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 multilayer design significantly enlarges the heat transfer area, improving production efficiency by forming a film turbulent state on the evaporation surface, thus enhancing heat transfer coefficients.
Implementation Method 1
a heating medium inlet channel (131) and a heating medium outlet channel (141), wherein the heating medium inlet channel and the heating medium outlet channel are separated by a separator
Implementation Method 2
one side of the evaporation channel is composed of evaporation wall surfaces (161-163)
Implementation Method 3
a film turbulent state is formed on the evaporation surface of the inner wall of the material cylinder, which can greatly improve the heat transfer coefficient
Data Source
AI summary
A multilayer thin film evaporator for steam heating includes a housing. A three-layer evaporation cylindrical core arranged in a nested manner with one layer placed inside the other is configured inside the housing. A limiting plate is configured to fix the three-layer evaporation cylindrical core. A feeding tube, a heating medium inlet tube, and a heating medium outlet tube are sequentially fixed under the limiting plate in a crosswise manner. A rotary rack spindle passing through a center of the three-layer evaporation cylindrical core, a rotary rack fixed on the rotary rack spindle and capable of rotating with the rotary rack spindle, and a motor component connected to a top end of the rotary rack spindle and capable of driving the rotary rack spindle to rotate are further provided.