A heat-dissipating structure with internally recycling heat transfer fluid, comprising: a U-shaped embedded support tube including two separate support tube posts (201, 202 or 301, 302) and a bent portion that connects fluid passages in the two support tube posts and forms a fluid circulation path for circulation of the recycling heat transfer fluid, wherein the support tube posts (201,202 or 301,302) and the bent portion of the U-shaped embedded support tube are made of a thermally conductive material, wherein a lower portion of the U-shaped embedded support tube extends into a natural thermal energy body and is embedded in a columnar heat transfer covering member installed in the natural thermal energy body, the heat transfer fluid exchanging thermal energy with the natural thermal energy body through the support tube posts (201, 202 or 301, 302), the bent portion, and the columnar heat transfer covering member, and wherein the support tube posts (201, 202, or 301, 302) are spaced apart and include respective front tube ports in communication with a fluid passage in an electric energy application device assembly supported by the separate and spaced apart support tube posts, and/or a fluid passage of a heat dissipater of the electric energy application device assembly to allow the heat transfer fluid to flow past, exchange thermal energy with, and return from the electric energy application device assembly and/or a heat dissipater to a respective one of the front tube ports; and at least one fluid pump installed in the fluid circulation path to control a flow direction of the heat transfer fluid in the fluid circulation path, wherein the heat transfer fluid pumped by the at least one fluid pump passes through the support tube posts (201,202 or 301,302) and the bent portion of the U-shaped embedded support tube to transfer heat from the electric energy application device assembly and/or heat dissipater to the natural thermal energy body. a U-shaped embedded support tube including two separate support tube posts (201, 202 or 301, 302) and a bent portion that connects fluid passages in the two support tube posts and forms a fluid circulation path for circulation of the recycling heat transfer fluid, wherein the support tube posts (201,202 or 301,302) and the bent portion of the U-shaped embedded support tube are made of a thermally conductive material, wherein a lower portion of the U-shaped embedded support tube extends into a natural thermal energy body and is embedded in a columnar heat transfer covering member installed in the natural thermal energy body, the heat transfer fluid exchanging thermal energy with the natural thermal energy body through the support tube posts (201, 202 or 301, 302), the bent portion, and the columnar heat transfer covering member, and wherein the support tube posts (201, 202, or 301, 302) are spaced apart and include respective front tube ports in communication with a fluid passage in an electric energy application device assembly supported by the separate and spaced apart support tube posts, and/or a fluid passage of a heat dissipater of the electric energy application device assembly to allow the heat transfer fluid to flow past, exchange thermal energy with, and return from the electric energy application device assembly and/or a heat dissipater to a respective one of the front tube ports; and at least one fluid pump installed in the fluid circulation path to control a flow direction of the heat transfer fluid in the fluid circulation path, wherein the heat transfer fluid pumped by the at least one fluid pump passes through the support tube posts (201,202 or 301,302) and the bent portion of the U-shaped embedded support tube to transfer heat from the electric energy application device assembly and/or heat dissipater to the natural thermal energy body.