Explosive Atmosphere Lamp with Thermal Decoupling
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Solution Overview
Problem
Existing light fittings for hazardous environments face challenges in dissipating waste heat efficiently, leading to overheating of electrical components and limiting the power of the light source due to the design of the luminaire housing, which restricts the light output and heat dissipation.
Innovation Solution
A light fitting design featuring a luminaire housing with a translucent chamber wall for heat dissipation via radiation and convection, a pressure-tight electronics compartment for thermal decoupling, and an insulating gas or gas reservoir to minimize direct heat transfer between the light source and electronics, allowing for the use of higher power LEDs while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source power is increased to provide sufficient illumination, then the light output is improved, but the waste heat increases causing overheating of electrical components
Solution Approach 1:
The housing is divided into a luminaire housing for the light source and a separate connector housing for the electronics compartment, with thermal insulation between them. This segmentation allows the light source to be cooled independently while protecting the electronics from excessive heat.
Solution Approach 2:
Thermal insulation material is introduced as an intermediary between the luminaire housing and the connector housing. This insulation layer blocks heat transfer from the hot light source to the electronics compartment, allowing high-power LEDs to operate without overheating the electrical components.
2Loss of energy
If the luminaire housing is enlarged to dissipate more heat, then the heat dissipation capacity is improved, but the compactness of the device deteriorates
Solution Approach 1:
The electronics compartment is extracted from the luminaire housing and placed in a separate connector housing. This extraction removes the heat-sensitive electronics from the hot luminaire housing, allowing the luminaire to be optimized for heat dissipation while the electronics are protected separately, maintaining overall compactness.
Solution Approach 2:
The thermal insulation layer acts as an intermediary that enables effective heat dissipation from the luminaire housing without requiring the entire device to be enlarged. The insulation confines heat to the luminaire housing where it can be dissipated, while protecting the electronics compartment from this heat.
3Device complexity
If the electronics compartment is placed directly in the luminaire housing to reduce device complexity, then the structural complexity is reduced, but the thermal coupling causes overheating of electronics
Solution Approach 1:
The housing is segmented into two functional units: the luminaire housing containing the light source and the connector housing containing the electronics compartment. This segmentation is achieved through a receiving space that accommodates the connector housing within or alongside the luminaire housing, providing both structural integration and thermal separation.
Solution Approach 2:
The connector housing is nested within the receiving space of the luminaire housing, creating a compact integrated structure. The connector housing can be partially or fully surrounded by the luminaire housing, achieving space efficiency while the thermal insulation maintains temperature separation between the nested components.
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 solution effectively dissipates waste heat, preventing overheating of electrical components and allowing for higher power LEDs, thereby increasing light output without enlarging the luminaire housing, ensuring safe operation in hazardous areas.
Implementation Method 1
an insulating gas or gas reservoir to minimize direct heat transfer between the light source and electronics
Implementation Method 2
waste heat is discharged via the housing, that is transmitted from the light source to the light housing and removed from it by radiation and convection to the outside environment
Implementation Method 3
waste heat is discharged via the housing, that is transmitted from the light source to the light housing and removed from it by radiation and convection to the outside environment
Implementation Method 4
Cooling structures, in particular cooling fins, are arranged on the external environment of the luminaire housing facing side
Data Source
AI summary
Luminaire for use in potentially explosive atmospheres, comprising: (a) a luminaire housing (1) with a luminaire chamber (2) having a translucent chamber wall (6), (b) a light source (9), preferably a light-emitting diode device, arranged in the luminaire chamber (2), the waste heat of which is dissipated via the luminaire housing (1), (c) a connection housing (11) with a pressure-resistant electronics chamber (12), at least a predominant part of which is arranged in the luminaire housing (1), (d) power supply electronics arranged in the electronics chamber (12) for supplying the light source (9) with electrical energy (e) and insulation (3, 14, 24) for thermal decoupling of the connection housing (11) and the luminaire housing (1), (f) wherein the insulation (3, 14, 24) surrounds at least a predominant part of the electronics chamber (12).