In working process, many thermoelectric coolers (TECs) refer to temperature increasing and declining periodically. Sometimes, this cycle can occur in the very wide temperature range. Although there is no clear boundary between cycle and non-cycle working conditions, in general case, if there are working conditions that can keep temperature regularly increasing and declining continuously, which is called thermo-cold cycling. These working conditions of the cycle generally trend to be controlled b...(more)
As thermoelectric cooler (TEC) is built on the basis of solid state, TEC has very high reliability. In most conditions of practical applications, TEC can provide a relatively long service lifetime. Currently, in many specific cases, the continuous work time of TEC has been over 20 years and is longer than other relative devices. However, it is still difficult to obtain specific reliability of TEC because failure and application environment are closely related. In some steady cooling conditions, ...(more)
Seebeck effect, Peltier effect and Thomson effect found the basis of thermoelectric theory of thermoelectric coolers (TEC) . In the view of the history of TEC (picture below), it has roughly gone through three stages of development. Physical picture of TEC The first stage refers to thermoelectric generation and thermoelectric cooling studied by Seebeck and Peltier respectively. Because of bad thermoelectric performances of metallic materials at that time, the efficiency of energy conversion was ...(more)
With the development of science and technology, TEC has attracted more and more attention and it has been widely used in our life. Now the following is about the application of TEC in home appliances. Physical picture of TEC 1. Refrigerator A lot of manufacturers have launched TEC refrigerator. For example, car refrigerator is also a kind of refrigerator, which is suitable for drive out use. On the current market, the size of this car refrigerator is from 3L to 33L. With the increase of car owne...(more)
Thermoelectric materials have three effects: Seeback effect, Peliter effect and Thomson effect. Thermoelectric material has many advantages: (1) It has compact size, light weight and no noise in work; (2) The temperature can be controlled within 0.1℃;(3)There is no CFC used in the thermoelectric material, which can pollute the environment; (4) As heat source can be recycled and transformed into electric energy (save energy), it has long service life and is easy to control. Therefore, thermoelec...(more)
LED is a kind of solid semiconductor lighting devices. Similar with traditional light source, during work, the solid light source will generate heat because of current flowing in the diodes. As long as the current flows continuously, the heat will continue to be produced. The node temperature of LED must be below 125℃. The high node temperature will bring many adverse effects, such as the quantum efficiency of LED reducing, the luminousefficiency declining, the peak wavelength shifting and ser...(more)
As shown figure 1, the heat flow _0 goes through the bottom of heat sink and then goes into its root. In the root, the heat flow will be divided into two shares _1and_2, and then through the root and environment air, start convection and heat exchange. Finally, the heat flow goes into the environment by heat exchange with fins. The heat resistance network model is shown in figure 1. Fig 1. The heat flow schematic diagram of heat sink dissipation Fig 2. The heat resistance network model of fins A...(more)
Thermoelectric cooler (TEC) is built on the Peltier effect. Due to the internal structure features of semiconductor material, it has more obvious thermoelectric effects than other metals do. Therefore, semiconductor material is usually used for making TEC . The cooling capacity of a pair of couple, which consists of P-type and N-type semiconductor, is fairly small. For example, the cooling capacity of the couple (6mm 7mm) is only 0.92~1.16W. In order to obtain more cooling capacity, many pairs o...(more)
