Absorption type chiller
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Solution Overview
Problem
Conventional absorption type chillers with heat pipes face issues such as increased thickness of liquid refrigerant flowing along the heat pipe's outer surface due to protrusions and grooves, leading to deteriorated heat transfer and mass transfer performance.
Innovation Solution
The absorption type chiller incorporates a heat pipe with a specific arrangement of protrusions and flow paths, where the distance between protrusions in the peripheral direction is smaller than in the longitudinal direction, enhancing the flowability of the absorbent and improving drainage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If protrusions and grooves are formed on the heat pipe outer surface to increase heat transfer area, then heat transfer area is increased, but liquid refrigerant thickness increases causing deteriorated heat transfer performance
Solution Approach 1:
The patent applies local quality by creating protrusions with different heights (first protrusions with height h1, second protrusions with height h2 where h1 < h2) and arranging them in alternating patterns. This local variation in protrusion height creates diverse flow path characteristics, allowing the liquid refrigerant to maintain thinner film thickness in critical areas while still increasing overall heat transfer area, thus resolving the contradiction between area expansion and heat transfer performance maintenance.
Solution Approach 2:
The patent introduces a new dimensional arrangement by configuring protrusions in both longitudinal and circumferential directions with specific pitch relationships (longitudinal pitch L1, circumferential pitch L2 where L1 < L2). This multi-dimensional arrangement creates a three-dimensional flow path structure that enhances heat transfer area without causing excessive liquid accumulation, as the liquid is distributed across multiple elevation levels and directional pathways.
2Area of stationary object
If protrusions and grooves are formed on the heat pipe outer surface, then heat transfer area is increased, but mass transfer performance between absorbent and moisture deteriorates
Solution Approach 1:
The patent applies local quality by creating protrusions with different heights (first protrusions with height h1, second protrusions with height h2 where h1 < h2) and arranging them in alternating patterns. This local variation in protrusion height creates diverse flow path characteristics, allowing the liquid refrigerant to maintain thinner film thickness in critical areas while still increasing overall heat transfer area, thus resolving the contradiction between area expansion and heat transfer performance maintenance.
Solution Approach 2:
The patent introduces a new dimensional arrangement by configuring protrusions in both longitudinal and circumferential directions with specific pitch relationships (longitudinal pitch L1, circumferential pitch L2 where L1 < L2). This multi-dimensional arrangement creates a three-dimensional flow path structure that enhances heat transfer area without causing excessive liquid accumulation, as the liquid is distributed across multiple elevation levels and directional pathways.
3Area of stationary object
If protrusions and grooves are formed on the heat pipe outer surface, then heat transfer area is increased, but viscous absorbent stagnates in gaps causing deteriorated heat transfer and mass transfer
Solution Approach 1:
The patent applies local quality by creating protrusions with different heights (first protrusions with height h1, second protrusions with height h2 where h1 < h2) and arranging them in alternating patterns. This local variation in protrusion height creates diverse flow path characteristics, allowing the liquid refrigerant to maintain thinner film thickness in critical areas while still increasing overall heat transfer area, thus resolving the contradiction between area expansion and heat transfer performance maintenance.
Solution Approach 2:
The patent introduces a new dimensional arrangement by configuring protrusions in both longitudinal and circumferential directions with specific pitch relationships (longitudinal pitch L1, circumferential pitch L2 where L1 < L2). This multi-dimensional arrangement creates a three-dimensional flow path structure that enhances heat transfer area without causing excessive liquid accumulation, as the liquid is distributed across multiple elevation levels and directional pathways.
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 results in improved heating and cooling performance, enhanced absorption efficiency, and increased heat transfer area, while reducing manufacturing costs and improving maintainability.
Implementation Method 1
a heat pipe which is arranged in at least one of the evaporator and the absorber
Implementation Method 2
an evaporator which evaporates refrigerant
Implementation Method 3
an absorber which generates an absorption liquid by mixing the refrigerant evaporated in the evaporator with an absorbent
Implementation Method 4
a regenerator which heats the absorption liquid supplied from the absorber
Implementation Method 5
a condenser to which refrigerant generated in the regenerator is supplied
Data Source
AI summary
An absorption type chiller includes an evaporator; an absorber which generates an absorption liquid by mixing the refrigerant evaporated in the evaporator with an absorbent; a regenerator which heats the absorption liquid supplied from the absorber; a condenser to which refrigerant generated in the regenerator is supplied; and a heat pipe which is arranged in at least one of the evaporator and the absorber and elongated. The heat pipe includes a plurality of protrusions which protrude from a surface of the heat pipe and are arranged in a longitudinal direction and a peripheral direction of the heat pipe. A distance between the plurality of protrusions arranged in the peripheral direction of the heat pipe is smaller than a distance between the plurality of protrusions arranged in the longitudinal direction of the heat pipe.