Abstract: A modular radiator panel includes a coolant tube, a saddle surrounding a first portion of the coolant tube and a radiative sheet mounted to the saddle. The radiative sheet surrounds a second portion of the coolant tube, such that the coolant tube is sandwiched between the radiative sheet and the saddle. A radiator includes a plurality of coolant tubes and saddles. Each saddle surrounds a first portion of a respective one of the coolant tubes. The radiator includes a plurality of radiative sheets. Each radiative sheet is mounted to a respective one of the saddles. Each radiative sheet surrounds a second portion of a respective one of the coolant tubes, similar to the radiative sheet described above.