Total Temperature Value (TTV) |
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View Menu > Statistics View > Total Temperature Value (TTV) In many applications the is a need to evaluate thermal performance - how well was a certain temperature band maintained over time. In some applications the ideal ambient temperature changes over time. At any given time there is an optimum temperature range for best results.
This optimum temperature profile - sometimes called the zone of thermal neutrality - can be modeled as a single or a series of equal length time periods, where each period has a lower an upper temperature. An index can be calculated for that period based on the distance the actual temperature strays outside the two limits. The total temperature value (TTV) for that period is calculated as the sum of the number of degrees outside the limits for each temperature sample in the period. Samples that are within the limits are not counted - only samples where the temperature is outside the limits are counted, and the further outside the limits the sample is, the higher its contribution for the TTV value for that period. The TTV value is thus a temperature-time integral of the deviation from the ideal range.
Temprecord allows you to specify up to 20 TTV periods of any duration, and then specify a lower and upper temperature limit for each period. The TTV value is calculated separately for the lower and upper limits for each time period, and total TTV results are also calculated.
The TTV statistics are shown in the statistics view. The TTV statistics can also be printed and exported. See also:
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