Research on an Active Heat Insulation Device for the Hadal Sample

Abstract Since the temperature between 1,000 m and 11,000 m below the sea surface is between 2‐8°C, a thermal insulation measure is needed when taking samples of the deep sea to obtain the in-situ properties from the samples more accurately in laboratory tests. Most of the current deep-sea thermal insulation sampling devices use passive thermal insulation, and the thermal insulation effect of adding thermal insulation coating, vacuuming, and exterior coating thermal insulation materials in the sample device is not ideal. This study uses a Thermoelectric Cooler (TEC) to cool active heat preservation equipment. TEC has the characteristics of light weight, small size, rapid response, and cool high efficiency. The device has carried out a series of preliminary experiments in the laboratory, which shows that the temperature can be kept between 2‐4°C. Through experimental verification, it is found that this thermal insulation system can maintain the temperature of the sample chamber well. The device can be mounted on various underwater robots and landers to provide technical and equipment support for marine scientific research.