摘要：

The cold therapy is often used to bring down a fever and to cure sports injuries. Most of the ice packs, bought from the market, are restrained by the time duration because the cold water or phase change material in ice pack can sustain within half hour when leaving the refrigerator. Before cold therapy, the ice packs must be stored in the refrigerator for at least an hour for the next therapy which is not convenient at all. Also, the inappropriate temperature span during the cold therapy is often the main cause of skin frostbite, nerve paralysis and other secondary injuries. In this study aims to develop a new cooler device which used thermo-electric cooler (TEC).And the temperature is control by a LM358 comparator, when water temperature is higher than target temperature , the comparator will instruct relay turn on TEC until water temperature is lower than target and then relay turn off TEC. This is the way to maintain the constant temperature. The continuous electricity supply helps the water pack to maintain the constant temperature all the time, not as a general bag only enough to maintain the 10-20 minutes. The baby is not suitable for taking antipyretic with a fever, they can use this device to bring down a fever, the cold pack doesn't need to replace in the whole night. And the temperature control prevents secondary injuries from cold therapy. Without external thermal load, this cooler demonstrates that the water in ice pack takes within 16 minutes to lower the fluid temperature from 24℃ to 18℃,When the external thermal load is 5 Watts, this system takes only 22 minutes to do so. Therefore, this TEC is in a more convenient way and has broad applications than the common ice packs.

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