Abstract: A capillary-tube energy-exchange system for transferring energy to or from an aircraft surface is comprised of inlet and exhaust manifolds interconnected by a plurality of Teflon capillary tubes. Fluid, either liquid or gas, is transferred from the inlet manifold through the capillary tubes to the exhaust manifold. During the fluid's flow, energy is transferred, typically from a warm fluid to an outer skin, in order to protect the aircraft's surface from ice accretions. The capillary tubes may be connected directly to ports formed in the manifolds; or, preferably, a chamber may be formed between the manifolds and the ends of the capillary tubes in order to transfer fluid therethrough. The energy-exchange system may be either an open or closed system.