Figure 3
Design of the water tank. (A) The customized tank comprises two heat sinks integrated with fans, 3D printed tank, and two Peltier devices. The tank has double-faced heat (and cold) sources; the top and bottom faces are made of the Peltier devices themselves so that water can be heated and cooled directly. The gaskets are put between the tank and heat sink to avoid water leakage. There are five holes to attach thermocouples; two are for measuring Peltier devices’ temperature, three are for water (upper side, middle, and lower side). The extrusion inside the tank covers the middle sensor for measuring water temperature to avoid contact with the Peltier devices. (B) The water storage part (pink part of this figure) is built by a 3D printer, designed to embed the Peltier devices and sandwich them using heat sinks from above and below. The part is made of a resin monomer, of which heat conductivity is low that can avoid heat loss from the tank wall.
