Moisure build up in sealed unit

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In summary, the conversation discusses the potential issues with moisture and electronics in a sealed light fixture and offers suggestions for minimizing the risks, such as using conformal coating, adding a vent hole, or using a bag of desiccant. The importance of considering temperature changes and the limitations of each solution are also mentioned.
  • #1
johanndavel
Hi guys, so I am building this light fixture as a concept an inside of the light fixture is a sealed cavity which houses the power supply and control gear. Now to service this unit that cavity opens up, but let's say on a hot humid day the unit is opened and that air enters the cavity. Its then closed until next time, but in the meanwhile every night just before the light switches on it becomes very cold and the moisture in the close environment condensates on my electronic or onto the roof and causes problems, or am i over thinking this?
 
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  • #2
Hello Johann, :welcome:

You are not over-thinking this: moisture and electronics can be a serious cause of problems. You have some worse-case scenario and try to think of a design that minimizes the risks: shape, materials choice, perhaps even a membrane to let the moisture go out with air when the unit is warm, ...
 
  • #3
BvU said:
Hello Johann, :welcome:

You are not over-thinking this: moisture and electronics can be a serious cause of problems. You have some worse-case scenario and try to think of a design that minimizes the risks: shape, materials choice, perhaps even a membrane to let the moisture go out with air when the unit is warm, ...
As i feared haha, so do you know of any material i can rad up on or do you think its up to doing some experiments ?
 
  • #4
Don't know of any reading material. (no expert, just a physicist).
Common sense can get you a long way: spray-paint sensitive circuitry (if present).
 
  • #5
search "conformal coating"
i'd leave a small vent hole at bottom so it can breathe and water will drip out.
 
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  • #6
How about a bag of silica gel desiccant? It can be regenerated on a fixed schedule, or (if an indicating type is used) whenever the color changes.
 
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  • #7
Asymptotic said:
How about a bag of silica gel desiccant? It can be regenerated on a fixed schedule, or (if an indicating type is used) whenever the color changes.
I think this is the best idea thank you
 
  • #8
So called "sealed lighting units" are rarely air tight. Temperature changes can cause the air inside to expand and contract pushing past gaskets.
 
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  • #9
Use a small vent hole, say 1mm. Plug it with a fine synthetic felt or thread filter to keep insects out.

You must decide if the vent will be at the bottom to drain liquid, or sheltered at the top, where the lower density water vapour component will be concentrated. Since condensation is the problem, a top hole is indicated.
 
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  • #10
Vent hole is OK only for limited climate variations. If the speed of the temperature change is too fast then moisture can't get out in time.

Coating might be OK, but that also has limits.

If it is really a sealed space then a bag of desiccant is your friend. Replace if every time when you open it and it will be fine.
 
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1. What causes moisture build up in a sealed unit?

Moisture build up in a sealed unit is usually caused by a break in the seal of the unit, allowing outside air and moisture to enter. This can be due to a faulty seal or damage to the glass or frame of the unit.

2. Can moisture build up be prevented in sealed units?

While it is not always possible to prevent moisture build up in sealed units, there are steps that can be taken to minimize the risk. This includes proper installation and regular maintenance of the units, as well as using high-quality materials and sealants.

3. How does moisture affect the performance of sealed units?

Moisture build up in sealed units can negatively impact their performance in several ways. It can reduce the insulation properties of the unit, leading to higher energy costs. It can also cause fogging or condensation on the glass, making it difficult to see through and reducing natural light in a space.

4. Are there any health risks associated with moisture build up in sealed units?

In addition to affecting the performance of sealed units, moisture build up can also lead to the growth of mold and mildew. This can pose health risks, especially for those with respiratory issues or allergies. It is important to address moisture build up in sealed units to prevent potential health hazards.

5. How can moisture build up in sealed units be fixed?

If moisture build up is detected in a sealed unit, it is important to address the issue as soon as possible. This may involve repairing or replacing the seal, replacing damaged parts of the unit, or improving ventilation in the space. It is best to consult a professional for proper diagnosis and repair of moisture build up in sealed units.

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