Semiconductor refrigeration for cold groove generally adopts high-power semiconductor refrigeration components as the cold source, whose work is work with dc current, it can refrigeration and heating, by changing the polarity of the dc current to decide on the same refrigeration piece refrigeration or heating, the generation of this effect is through the principle of thermoelectric don't need dry ice, such as ammonia, nitrogen, and freon refrigerant, Low temperature, fast refrigeration, long service life.