This design was proposed as a way to prevent the death of the population in the aquaculture by blocking the increase of sea water temperature and cooling. In order to minimize the damage of the aquaculture due to the rise of the seawater temperature in the summer, we intend to induce a decrease in the seawater temperature for a part around the farm. Since almost all sea water cooling is applied to the aquaculture farms due to the difficulties in installation and cost, it is exposed to natural disasters in the marine aquaculture farms such as Cajuri farms. Induction of seawater temperature only at about 6 ℃ can prevent the mass death due to the temperature rise in the farm. The present invention is intended to induce a decrease in seawater temperature around the cooler as described above. The chiller is constructed in a direct manner, in direct contact with the sea surface. There is also an attempt to lower the water temperature by blowing cold air on the bottom of the farm, but the direct contact method is superior in terms of efficiency. In the present invention, since the direct method of cooling the seawater by contacting the cooling radiator is adopted, the cooling efficiency is high. To this end, separate devices for compressing and expanding the cooling refrigerant are required. In order to control the individual block units of the farm structure, it is possible to have a single structure cooling structure so that it can be individually installed according to the number of installations. We construct a system to control the inflow and outflow structure of refrigerant quantity by installing the farm structure in a matrix manner. Inside a single block, a temperature sensor is installed, and a control valve is constructed in the inflow / outflow structure so that the refrigerant amount can be automatically adjusted by comparing the temperature with a user setting value. The power source used is an electric power source. Due to the nature of the installation site,
