What creats a Thermal Anomoly?

Things that cause an anomaly are numerous.

  Air infiltration: due to inadequate building envelopes or air leakage from mechanical equipment.

  Moisture intrusion: water retains its heat longer and appears warm.

  Evaporative cooling: liquids cool below the ambient air temperature as they evaporate and appear cool.
Condensation: water vapor warms the cool object that condenses water vapor to a liquid.

  Specific density changes: the ability of a substance to retain its heat will change when deterioration from rot or insect infestation occurs.

  Changes in fluid flow: increased or decreased fluid flow are apparent during the heat exchange in hydronic heating equipment and even blood flow.

 A thermal scan is not actually a photograph, rather a display of 307,200 individual temperature readings (in some cameras).  

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