In-Wall Video Codec Cooling With Dual Active-Passive Heat Paths
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Solution Overview
Problem
Audio/video transceivers in gang boxes face challenges with heat dissipation due to limited access to cooling surfaces, as they are often housed in insulated walls with restricted space, leading to potential overheating and safety concerns.
Innovation Solution
A dual mode cooling system incorporating both active and passive cooling paths, utilizing a finned heat sink, a fan for active cooling, and conductive heat transfer to the faceplate for passive cooling, ensuring heat is dissipated through the faceplate without exceeding safe touch temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If AV circuitry is housed in a standard gang box within an insulated wall, then the device can be installed in common wall locations, but heat dissipation becomes severely limited leading to overheating
Solution Approach 1:
The cooling system is divided into two independent pathways: a passive cooling path that conducts heat directly through the faceplate, and an active cooling path that uses a fan and heat sink for forced air cooling. This segmentation allows each pathway to operate independently and simultaneously, maximizing heat dissipation capability while maintaining installation flexibility in standard gang boxes
Solution Approach 2:
A heat sink is introduced as an intermediary component between the AV circuitry and the cooling pathways. The heat sink receives heat from the circuitry and distributes it to both the passive cooling path (through thermal conduction to the faceplate) and the active cooling path (through forced convection with fan-driven air flow), thereby enhancing overall heat dissipation efficiency
2Ease of manufacture
If a plastic Decora faceplate is used to cover the mounting plate, then aesthetic appearance is improved, but the metal mounting plate surface area available for heat transfer is reduced
Solution Approach 1:
The cooling system transitions from relying solely on two-dimensional conduction through the faceplate to incorporating three-dimensional forced convection through a heat sink with extended surfaces (fins). The heat sink's finned structure dramatically increases the heat transfer surface area in the vertical dimension, compensating for the reduced surface area available through the faceplate while maintaining the aesthetic plastic Decora faceplate
3Temperature
If active cooling with a fan is implemented, then heat dissipation efficiency is improved, but device complexity and noise increase
Solution Approach 1:
The cooling system is designed to be dynamically adaptive, automatically selecting between passive and active cooling modes based on thermal conditions. The control circuitry monitors temperature and activates the fan only when necessary, allowing the system to operate in a simple passive state during low-heat conditions and switch to active cooling when higher heat dissipation is required, thereby balancing efficiency with complexity and noise
Solution Approach 2:
The faceplate serves multiple functions: it provides the aesthetic Decora appearance, acts as a structural mounting surface, and simultaneously serves as a heat transfer path in the passive cooling system. This multi-functionality reduces the need for additional dedicated cooling components, thereby lowering overall device complexity while maintaining effective heat dissipation
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
Effectively removes heat generated by electronic circuitry within the adiabatic enclosure, maintaining the faceplate temperature below unsafe levels even when the system is in a low power state, thus ensuring safety and silent operation.
Implementation Method 1
a finned heat sink adapted to be in thermal contact with the electronic heat generating circuitry, the finned heat sink comprising a plurality of heat radiating fins
Implementation Method 2
an active cooling path, comprising: a path of air that passes through the cool air intake through the fan, through the plurality of heat radiating fins
Implementation Method 3
a passive cooling path, comprising: a conductive heat transfer path adapted to transfer heat from the electronic heat generating circuitry through one or more heat conducting devices, to the faceplate
Implementation Method 4
heat received by the faceplate is convectively transferred to a volume of air surrounding the faceplate
Data Source
AI summary
Described herein is a compact combined active and passive cooling system to cool electronic audio-video circuitry, wherein all of the AV circuitry and cooling system fits within an enclosure that can be installed in a standard wall gang-box located in interior walls of structures. The combined active and passive cooling system uses convection, conduction, and radiation in active and passive cooling modes to dissipate heat generated by the AV circuitry into the room in which the gang box is located, and further uses the wall plate surface to dissipate heat into the room.