High-frequency melting of interfacial ice

• US 7,087,876 B2
• Filed: 10/11/2001
• Issued: 08/08/2006
• Est. Priority Date: 06/15/1998
• Status: Expired due to Fees

• Current Assignee: The Trustees of Dartmounth College (Dartmouth College)
• Original Assignee: The Trustees of Dartmounth College (Dartmouth College)
• Inventors: Petrenko, Victor F.
• Primary Examiner(s): Van, Quang T.
• Application Number:
  US09/976,210
• Publication Number:
  US 20020092849A1
• Time in Patent Office: 1,762 Days
• Field of Search: 219/770, 219/780, 219/772, 219/497, 219/209, 219/644, 219/635, 310/321, 310/322, 310/323.21, 244/134.R, 244/134.D, 244/134.F, 244/138.R, 174/110.R, 174/102.R, 174/115, 174/128.1, 205/628, 205/630, 204/242, 206/317, 206/589
• US Class Current: 219/770
• CPC Class Codes: B60S 1/026 using electrical means
• CPC Class Codes: B60S 1/3805 electrically
• CPC Class Codes: B64D 15/12 by electric heating electric heating elements in general H05B
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: E01C 11/265 Embedded electrical heating elements in floors F24D13/00; Mounting thereof
• CPC Class Codes: E01D 19/00 Structural or constructional details of bridges
• CPC Class Codes: F25D 21/08 by electric heating
• CPC Class Codes: H05B 2214/02 Heaters specially designed for de-icing or protection against icing
• CPC Class Codes: H05B 3/00 Ohmic-resistance heating
• CPC Class Codes: H05B 3/56 Heating cables
• CPC Class Codes: H05B 3/84 Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
• CPC Class Codes: H05B 6/62 Apparatus for specific applications

Abstract

An alternating electric field is applied at an ice interface to generate a resistive AC current having a frequency greater than 1000 Hz in interfacial ice. Typically, a first electrode and a second electrode proximate to the interface are separated by an interelectrode distance of about 50 μm to 500 μm. An AC power source provides a voltage of about 10 to 500 volts across the electrodes in order to create the alternating electric field. Interfacial ice converts capacitive AC current into resistive AC current, which generates Joule heat in the interfacial ice.

Claims

1. A system for melting interfacial ice, comprising:

a first electrode embedded into or coated onto an object to be protected from ice formation;

a second electrode, the first electrode and the second electrode defining an interelectrode space between the first electrode and the second electrode, the first electrode and the second electrode defining an interelectrode distance that separates the first electrode and the second electrode;

an electrical insulator located in the interelectrode space, wherein the insulator comprises a nonconductive rubber windshield wipe blade; and

an AC power source for providing an AC voltage across the first and second electrodes having a frequency greater than 1000 Hz and less than 300 KHz wherein the interfacial ice is melted upon application of the AC voltage.

2. A system as in claim 1, wherein the AC power source provides an AC voltage in a range of about from 10 volts to 500 volts.

3. A system for melting interfacial ice, comprising:

a first electrode embedded into or coated onto an object to be protected from the formation,

wherein the first electrode comprises a layer of conductive glass;

a second electrode, the first electrode and the second electrode defining an interelectrode distance that separates the first electrode and the second electrode; and

an AC power source for providing an AC voltage across the first and second electrodes having a frequency greater than 1000 Hz and less than 300 KHz wherein the interfacial ice is melted upon application of the AC voltage.

4. A system as in claim 3, wherein the interelectrode distance has a value in a range of about 50 82m to 500 μ

m.

5. A system as in claim 3, wherein the interelectrode distance has a value less than 50 82 m.

6. A system as in claim 3, wherein the interelectrode distance has a value greater than 500 82 m.

7. A system as in claim 3, wherein the AC power source provides an AC voltage in a range of about 10 volts to 500 volts.

8. A system for melting interfaceial ice, comprising:

a first electrode embedded into or coated onto an object to be protected from ice formation;

a second electrode, the first electrode and the second electrode defining in interelectrode distance that separates the first electrode and the second electrode,

wherein the second electrode comprises a layer of conductive glass; and

an A/C power source for providing an AC voltage across the first and second electrode having a frequency greater than 1000 Hz and less than 300 KHz wherein the interfacial ice is melted upon application of the AC voltage.

9. A system as in claim 8, wherein the AC power source provides an AC voltage in a range of about rom 10 volts to 500 volts.

10. A system as in claim 8, wherein the interelectrode distance has a value in a range of about from 50 82 m to 500 82 m.

11. A system as in claim 8, wherein the interelectrode distance has a value less than 50 82 m.

12. A system as in claim 8, wherein the interelectrode distance has a value greater than 500 82 m.

13. A system for melting interfacial ice, comprising:

a first electrode embedded into or coated onto an object tobe protected from ice formation,

wherein the first electrode comprises a transparent conductive metal oxide;

a second electrode, the first electrode and the second electrode defining an interelectrode distance that separates the first electrode and the second electrode; and

an AC power source for providing an AC voltage across the first and second electrodes having a frequency greater than 100 Hz and less than 300 KHz wherein the interfacial ice is melted upon application of the AC voltage.

14. A system as in claim 13, wherein the AC power source provides an AC voltage in a range of about 10 volts to 500 volts.

15. A system as in claim 13, wherein the interelectrode distance has a value in a range of about 50 82 m to 500 82 m .

16. A system as in claim 13, wherein the interelectrodes distance has a value less than 50 82 m.

17. A system as in claim 13, wherein the interelectrode distance has a value greater than 500 82 m.

18. A system for melting interfacial ice, comprising:

a first electrode embedded into or coated onto an object to be protected from ice formation,

wherein the first electrode comprises a conductive grid and the conductive grid includes metal strips;

a second electrode, the first electrode and the second electrode defining an interelectrode distance that separat the first electrode and the second electrod; and

an AC power source for providing an AC voltage across the first and second electrodes having a frequency greater than 1000 Hz and less than 300 KHz wherein the interfacial ice is melted upon application of the AC voltages.

19. A system as in claim 18, wherein the second electrode comprises a conductive grid.

20. A system for melting interfacial ice, comprising:

a first electrode embedded into or coated onto an object to be protected from ice formation;

a second electrode, the first electrode and the second electrode defining an interelectrode distance that separates the first electrode and the second electrode,

wherein the second electrode comprises a conductive rubber windshield wiper blade; and

an AC power source for providing an AC voltage across the first and second electrodes having a frequency greater than 1000 Hz and less than 300 KHz wherein the interfacial ice is melted upon application of the AC voltage.

21. A system as in claim 20, wherein the AC power source provides an AC voltage in a range of about 10 volts to 500 volts.