MOVIE 2 TIME-LAPSE INFRARED THERMOGRAPHY
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file://Hardham heating.mov
To assess the influence of the electric heating at wall plate level on the local microclimate at Hardham Church—and hence on the behaviour of the salts and coatings—imaging of the surface temperature during heating was carried out using infrared thermography. For the trial, the overhead heating was turned on for 2.5 hours, surface temperature in the affected area was measured and imaged to produce a time-lapse record, and RH and AT below the heater were also measured.
This data shows that the effects are rapid and dramatic: after 1 hour the surface temperature had increased 1.7 °C and the ambient temperature 3.5 °C, while the RH had decreased 14%. At 2.5 hours, the changes in AT and RH had slowed (to +4.4 °C and -18%, respectively), but the surface temperature continued to rise at a steep rate (to an eventual +3.6 °C). Interestingly, the rates of change during cooling are even more rapid: after 90 minutes all three parameters have almost returned to their initial values: RH -3%, ST +1.1 °C, and AT +1.1 °C.