Infrared Thermography

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If the free air condition is warm and dry low RH it may create a high rate of cooling. One evaporative cooling application that can be performed by a thermographer irrespective of the exterior environmental conditions is the potential identification of moisture sources from plumbing and HVAC equipment.

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This only requires that the water be present in the system, that the leak be occurring into a free air space such as the interior ceiling joist space above the drywall, within interior uninsulated partition walls, or the flooring around showers, toilets and sinks or water using appliances. The irony about thermal detection of a cool surface through evaporation to free air is that the materials are often drying out, and if the source of water has stopped or is a one-time occurrence, there may not be any long-term issues.

Just as the evaporative phase change can be a very dramatic endothermic process, the condensation of water vapour back to water can be just as dramatic exothermic process.


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If condensation is occurring within a wall behind a vapour barrier then latent heat will be released and surface warming may occur. If warm moist air is present either through vapour diffusion or air leakage and migrates to an area below the dew point, then water vapor will start condensing. While this can happen anywhere in the building which has a positive pressure with respect to the outside, it will be particularly prevalent in upper locations which have air leakage pathways to the attic.


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A thermographer likely will not detect moist warm air exfiltration against an insulated warm ceiling, as could occur around a light fixture, yet above there could be significant water deposition in the insulation and into the attic space. Warm areas created by condensation of water vapour may be indicative of a non-drying condition and long term accumulation of water within an enclosure, which can be much a more serious issue.

View the discussion thread. Skip to main content. Infrared - Buildings. Moisture detection through evaporative phase change Many inspectors believe that the only mechanism for detection of moisture is evaporation. Moisture detection through condensing phase change Just as the evaporative phase change can be a very dramatic endothermic process, the condensation of water vapour back to water can be just as dramatic exothermic process. An infrared camera does not directly detect evaporation: rather it may detect a surface temperature depression due to the rate of evaporation.

Infrared Thermography for Building Envelope Systems

If the free air condition is warm and dry low RH it may create a high rate of cooling. One evaporative cooling application that can be performed by a thermographer irrespective of the exterior environmental conditions is the potential identification of moisture sources from plumbing and HVAC equipment. This only requires that the water be present in the system, that the leak be occurring into a free air space such as the interior ceiling joist space above the drywall, within interior uninsulated partition walls, or the flooring around showers, toilets and sinks or water using appliances.

Introduction to Infrared Thermography

The irony about thermal detection of a cool surface through evaporation to free air is that the materials are often drying out, and if the source of water has stopped or is a one-time occurrence, there may not be any long-term issues. Just as the evaporative phase change can be a very dramatic endothermic process, the condensation of water vapour back to water can be just as dramatic exothermic process.

Recent Industrial Applications of Infrared Thermography: A Review - IEEE Journals & Magazine

If condensation is occurring within a wall behind a vapour barrier then latent heat will be released and surface warming may occur. If warm moist air is present either through vapour diffusion or air leakage and migrates to an area below the dew point, then water vapor will start condensing.

APPLIED THERMOGRAPHY

While this can happen anywhere in the building which has a positive pressure with respect to the outside, it will be particularly prevalent in upper locations which have air leakage pathways to the attic. A thermographer likely will not detect moist warm air exfiltration against an insulated warm ceiling, as could occur around a light fixture, yet above there could be significant water deposition in the insulation and into the attic space. Warm areas created by condensation of water vapour may be indicative of a non-drying condition and long term accumulation of water within an enclosure, which can be much a more serious issue.

View the discussion thread.

Infrared and thermal testing

Skip to main content. Infrared - Buildings. Moisture detection through evaporative phase change Many inspectors believe that the only mechanism for detection of moisture is evaporation.