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D. Determine Number of Stages Required

Select the minimum number of stages from Table IV necessary to meet the required DT.

Table IV
Typical maximum obtainable DT Values for Single- & Multi-stage TECs

Number
Of Stages DTmax in Dry N2 @ 1 atm
(°C) DTmax in a Vacuum
(°C)
1 64 67
2 84 91
3 95 109
4 -- 115
5 -- 121
6 -- 127



In this example, a single-stage TEC will suffice since 64°C is greater than the desired 35°C DT. If the number of stages required exceeds two, the following selection process is not applicable. These calculations are only accurate for one- or two-stage TECs. For three-stage and above, call one of our applications engineers for assistance.