Temperature evaluation test for sealed camera housing

The camera was installed inside a camera housing, and the cooling performance of the sealed enclosure cooling system (Entaniya Silent Mount 315) was evaluated.

Measurement results when using a 2.64 W industrial camera

Measurement Items	Temperature Range
Ambient Temperature	21〜32℃
Inside the Housing	41〜52℃
CPU Area	45〜55℃

Based on the measurement results

It was confirmed that the internal temperature of the case remains approximately +20°C above ambient temperature.
Based on this result, the estimated internal housing temperature and CPU temperature relative to ambient temperature when using a 2.64 W camera are as follows:

Ambient Temperature	Inside the Housing	CPU Area
-30℃	-10℃	-5℃
-20℃	0℃	5℃
-10℃	10℃	15℃
0℃	20℃	25℃
10℃	30℃	35℃
20℃	40℃	45℃
30℃	50℃	55℃
40℃	60℃	65℃
50℃	70℃	75℃

0.8W USB Camera Temperature Prediction (AI Estimate)

The measured value of the ELP 12MP USB camera was 159.4 mA @ 5V, and its power consumption was approximately 0.8 W.
Compared with the existing PoE camera configuration (approx. 2.9 W), heat generation is significantly lower, and in the same housing, the internal temperature rise is expected to be reduced to around 5.5°C.
With a low-power USB camera, it is highly likely that the ASA housing alone will be sufficient, while the heat sink and fan would serve to provide additional safety margin.

Measurement Items	Temperature Range
Ambient Temperature	19℃
Inside the Housing	24〜26℃
CPU Area	29〜37℃

Measurement results without cooling system

Predicted Temperature Rise by Cooling Structure

Using both the fan and heat sink provides the highest cooling effect, and it was confirmed that the internal temperature of the housing can be reduced by approximately 5–10°C compared to the case without a cooling system.

Cooling Structure	Housing Internal Temperature Rise	CPU Temperature Rise	Features
Fan + Heat Sink	approx. +5〜6℃	approx. +8〜9℃	ost stable cooling performance.
No Fan + Heat Sink	approx. +7〜10℃	approx. +12〜15℃	Quiet operation, but some internal heat convection may occur.
No Fan + No Heat Sink	approx. +10〜15℃	approx. +15〜23℃	Heat tends to accumulate because cooling relies only on natural convection.

Predicted Temperature Rise by Cooling Structure with 0.8W USB Camera (up to 50°C)

Ambient Temperature	Fan + Heat Sink	Heat Sink Only	Natural convection only
0℃	Inside the Housing 6℃ / CPU 9℃	Inside the Housing 7〜10℃ / CPU 12〜15℃	Inside the Housing 10〜15℃ / CPU 15〜23℃
10℃	Inside the Housing 16℃ / CPU 19℃	Inside the Housing 17〜20℃ / CPU 22〜25℃	Inside the Housing 20〜25℃ / CPU 25〜33℃
20℃	Inside the Housing 26℃ / CPU 29℃	Inside the Housing 27〜30℃ / CPU 32〜35℃	Inside the Housing 30〜35℃ / CPU 35〜43℃
30℃	Inside the Housing 36℃ / CPU 39℃	Inside the Housing 37〜40℃ / CPU 42〜45℃	Inside the Housing 40〜45℃ / CPU 45〜53℃
40℃	Inside the Housing 46℃ / CPU 49℃	Inside the Housing 47〜50℃ / CPU 52〜55℃	Inside the Housing 50〜55℃ / CPU 55〜63℃
50℃	Inside the Housing 56℃ / CPU 59℃	Inside the Housing 57〜60℃ / CPU 62〜65℃	Inside the Housing 60〜65℃ / CPU 65〜73℃

Based on the above estimate, if a camera with power consumption of approximately 0.8 W is used, the CPU temperature may exceed the commonly accepted operating limit of around 70°C when relying on natural convection alone. However, by using the cooling system together, more stable operation can be expected.

Notes

Assumption: The measured USB camera current was 159.4 mA, which corresponds to approximately 0.8 W at USB 5V.
In the existing test, the total heat generation of the PoE camera + PoE board was approximately 2.9 W, and the temperature inside the housing was about 20°C higher than the ambient temperature.
The predictions above are based on proportional scaling from those measured values, with the chip-area temperature organized as an additional rise above the housing internal temperature.

Fan + Heat Sink
Even at an ambient temperature of 50°C, the CPU temperature is predicted to be around 60°C.
No Fan + Heat Sink
The CPU temperature may rise to around 65–68°C.
Natural Convection Only
The CPU temperature is predicted to reach around 70–78°C, which is considered quite severe.

Differences in effectiveness depending on the mounting position of the cooling system

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