Wearable accessory with heat transfer capability
A wearable heat transfer device provides a user with haptic feedback providing sensations of hot or cold. The wearable heat transfer device comprises a heat source/sink and a programmable interface having heat transfer characteristics that are modified based on a signal received by the programmable interface. For example, a thickness of the programmable interface changes based on the received signal, altering heat transfer by the programmable interface. In another example, an electric field is applied to the programmable interface, changing one or more properties of the programmable interface affecting heat transfer.
1. A system comprising:
a heat source configured to generate thermal energy;
a programmable foam coupled to the heat source and comprising an open cell foam composed of a dielectric material with a plurality of voids, the programmable foam having a thickness configured to be modulated based on a received voltage; and
a controller coupled to the programmable foam and configured to:
receive one or more instructions from a console,
responsive to receiving the one or more instructions, generate a voltage, and
provide the generated voltage to the programmable foam.
2. The system of claim 1 , wherein the generated voltage comprises one or more selected from a group consisting of: a transitory voltage pulse, a periodic voltage signal, a constant voltage signal, and any combination thereof.
3. The system of claim 1 , wherein the heat source is further configured to dissipate thermal energy.
4. The system of claim 1 , further including one or more electrodes coupled to the controller and to the programmable foam, the one or more electrodes configured to provide the generated voltage to the programmable foam.
5. The system of claim 1 , further including a fan coupled to the heat source, the fan configured to provide a heat transfer path between the heat source and an environment external to the heat source.
6. The system of claim 1 wherein the open cell foam has a thermal conductivity and the plurality of voids have an alternative thermal conductivity that is lower than the thermal conductivity of the open cell foam.
7. The system of claim 6 , wherein a thermal conductivity of the programmable foam is inversely proportional to the thickness of the programmable foam.
8. The system of claim 1 , wherein the programmable foam includes an air bladder configured to inflate in response to receiving the generated voltage from the controller.
9. The system of claim 1 , further comprising:
an electrode contacting a surface of the programmable foam;
an additional electrode contacting another surface of the programmable foam that is parallel to the surface;
a piezoelectric actuator coupled to the electrode, to the additional electrode, and to the controller, the piezoelectric actuator configured to draw the electrode closer to the additional electrode based on the generated voltage.