2. Mathematical model
Fig. 2. Energy flow in the experimental system.Figure optionsDownload full-size imageDownload as PowerPoint slide
As the rate of temperature change within the system is slow, the acrylic tube and bellows are sealed, and the fans circulate the air inside it, these Epigallocatechin assumptions are deemed acceptable.
2.1. Thermoelectric devices
Thermoelectric modules supply heat or cooling to the system through Peltier effect. A thermoelectric couple is composed of a p- and an n-type semiconductor. When current is passed through it, one junction is secondary extinction heated while the other is cooled, depending on the direction of the current. A thermoelectric module typically consists of N couples. The heat generated and absorbed at the two ends is a result of three effects. First, the Peltier effect is responsible for producing the temperature gradient. Second, Joule's Law causes the couple to heat up as current passes through it. And finally, heat is conducted from the hot junction to the cold junction due to the temperature gradient between the two.