The ice-making characteristics of a coil-type ice maker are experimentally investigated. The experiment was conducted under the following conditions: coolant temperatures of ?10, ?8, and ?6 °C, coolant flow velocities of 1.0, 1.4, and 1.8 m/s, and ini-tial water temperatures of 6, 9, and 12 °C. The relationship between the nondimensional ice thickness and the nondimensional freez-ing time was examined experimentally. The nondimensional correlation equations for coolant temperature, water temperature, cool-ant flow velocity, initial water temperature, and copper tube size were derived as r3+ = 0.063ln(t+) + 0.206 in the range of R+T+ = 2.1?4.7.