a factory has an electrical generator that uses cooling water to maintain the range of operating temperature. the coolant carries heat from the generator to the waste heat source. in the diagram, coolant from the waste hear source flows through pipes to the cooling water. the section of pipe from x to y of the cooling system sometimes freezes in the winter and prevents the coolant from flowing from the waste hear source to the cooling tower. the pipes do not touch the surrounding air. Describe how to prevent the section of pipe from x to y from freezing