การทดลองหาสมรรถนะการทำงานที่เหมาะสมของระบบทำอากาศเย็นเทอร์โมอิเล็กทริก

Abstract

Thermoelectric devices are made from semiconductor materials. Thermoelectric cooling uses the Peltier effect to create a different temperature between two sides of thermoelectric module. The advantages of thermoelectric cooler (TEC) compared to a vapor compression cooling system are its lack of moving parts, small in size, lightweight and refrigerant free. This research was carried out to study the parameters affected the performance and cooling effect of the thermoelectric air-cooling system, using a TEC1-12715 module, through experiments. The experiment runs were set according to the Central Composite Experiment Design. The parameters were Reynolds number on hot-side (Reh) ranging from 3,074-14,139, Reynolds number on cold-side (Rec) ranging from 2,378-25,613, flow area to heat transfer area ratios of cold-side heat sink (AR) ranging from 0.042-0.306, and the input power ratios of thermoelectric (PR) ranging from 0.09-1.00. The Response Surface Method (RSM) was used to determine the optimal cooling conditions and cooling performances of thermoelectric air cooling system. The results showed that the maximum coefficient of performance (COPa) was 2.78 occurred at air cooling rate (qac) of 216 W, PR of 0.545 (74 W), Reh of 8,606 and Rec of 13,995. It can be observed that the highest values of the independent parameters were not resulted in maximum of COPa and qac concurrently. The significant factors influencing COPa in descending order were AR, PR, Reh, Rec, respectively. The significant factors influencing qac in descending order were AR, Reh, Rec, PR respectively. The optimal COPa and qac applicable for air conditioning, obtained from contour plots overlaying between two factors and two responses, were achieved in the low-range of AR (0.042-0.055), in the mid-range of PR (0.590-0.681), the median of Reh (8,606) and the median of Rec (13,995).