Abstract
We examined a dynamic model of the relationship between basic parameters and indicators of reliability, taking into consideration the structural and technological elements, for a single-stage cooling device under various current modes of operation, thermal load at a temperature difference of 40 K. The ratios derived allow us to define the time required for a single-stage of thermoelectric cooling device to enter a stationary mode of operation, and the temperature of a heat-absorbing junction. The dependences take into consideration values of a thermal load, the number of thermoelements, current mode of operation, with respect to both the mass and heat capacity of the object, and the mass and heat capacity of structural and technological elements at heat-absorbing junctions of the module. It was found that the heat capacity and mass of structural and technological elements of the module affect not only the time required to enter a stationary mode, but the device's reliability indicators, reducing them by 2‒3 times. The results of analysis of dynamic characteristics and energy indicators of a single-stage thermoelectric cooler demonstrated the possibility to control the time required to enter a stationary mode. Structural control, enabled by selecting the number and geometry of the cooler's thermoelements, and the mass and heat capacity of the load, makes it possible to reduce the time required for a thermoelectric cooling device to enter a stationary mode by up to 2.5 times. Operational control, executed by changing working current of the cooler, makes it possible to reduce the time required to enter a stationary mode by up to 3 times.
Highlights
Determining the time that it takes for a thermoelectric cooling device (TED) to enter a stationary working mode over the preset temperature range is an interesting task
Specification of requirements to thermoelectric coolers for cooling capacity, energy indicators, weight and dimensions, resulted in the variety of thermoelectric modules [6]. Since such an integrated indicator as reliability depends on the design and manufacturing technology, there are developed methods to investigate indicators of reliability over the entire life cycle, starting at the design stage all the way to operation of thermoelectric coolers [7]
– the time required to enter a stationary mode taking into consideration structural and technological elements on the heat-absorbing junctions of a single-stage TED for different modes of operation Q0max; (Q0/I)max; Emax; λmin, heat load Q0 and temperature difference ∆T=40 K;
Summary
Determining the time that it takes for a thermoelectric cooling device (TED) to enter a stationary working mode over the preset temperature range is an interesting task. This is related to the fact that dynamic indicators for the means that enable heat regimes of thermally loaded elements largely define both functional and reliable capabilities of critical. In this case, only the mass and specific heat of an object are typically accounted for in the process of entering the mode. Experience has shown that there is a need to take into consideration the heat capacity and mass of structural and technological elements, as well as current operating mode. It is a relevant task to create a controllable dynamic system to monitor temperature at a thermally loaded element
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