Sheathed Fiberglass Heater Wire

Abstract

An apparatus is disclosed. The apparatus includes a resistive wire having a circumference. The apparatus further includes a first fiberglass layer disposed about the circumference of the resistive wire and along a length of the resistive wire. The apparatus further includes a second fiberglass layer. The apparatus further includes a third fiberglass layer, the second fiberglass layer disposed between the first fiberglass layer and the third fiberglass layer, the third fiberglass layer forming an outer layer and surrounding the second fiberglass layer.

What is claimed is: 
     
         1 . An apparatus comprising:
 a resistive wire having a circumference;   a first fiberglass layer disposed about the circumference of the resistive wire and along a length of the resistive wire;   a second fiberglass layer; and   a third fiberglass layer, the second fiberglass layer disposed between the first fiberglass layer and the third fiberglass layer, the third fiberglass layer forming an outer layer and surrounding the second fiberglass layer.   
     
     
         2 . The apparatus of  claim 1 , further comprising a fiberglass core, the resistive wire wound about the fiberglass core. 
     
     
         3 . The apparatus of  claim 1 , wherein the first fiberglass layer comprises an S-glass type fiberglass. 
     
     
         4 . The apparatus of  claim 1 , wherein the first fiberglass layer comprises a fiberglass material different than a fiberglass material of the second fiberglass layer. 
     
     
         5 . The apparatus of  claim 2 , wherein the fiberglass core comprises an S-glass type fiberglass. 
     
     
         6 . The apparatus of  claim 1 , wherein the third fiberglass layer comprises a fiberglass material different than the first fiberglass layer and different than the second fiberglass layer. 
     
     
         7 . The apparatus of  claim 1 , further comprising a kapton layer, the kapton layer forming an outer layer and surrounding the third fiberglass layer. 
     
     
         8 . The apparatus of  claim 7 , wherein the kapton layer comprises a polyimide film and silicone adhesive. 
     
     
         9 . The apparatus of  claim 1 , wherein the resistive wire comprises a double resistive wire. 
     
     
         10 . A method comprising:
 providing a heater wire disposed within a tube of a refrigeration system, the heater wire comprising:
 a resistive wire having a circumference; 
 a first fiberglass layer disposed about the circumference of the resistive wire and along a length of the resistive wire; 
 a second fiberglass layer; and 
 a third fiberglass layer, the second fiberglass layer disposed between the first fiberglass layer and the third fiberglass layer, the third fiberglass layer forming an outer layer and surrounding the second fiberglass layer; and 
   providing a current through the resistive wire to heat at least a portion of the refrigeration system.   
     
     
         11 . The method of  claim 10 , wherein the heater wire further comprises a fiberglass core, the resistive wire wound about the fiberglass core. 
     
     
         12 . The method of  claim 10 , wherein the first fiberglass layer comprises an S-glass type fiberglass. 
     
     
         13 . The method of  claim 10 , wherein the first fiberglass layer comprises a fiberglass material different than a fiberglass material of the second fiberglass layer. 
     
     
         14 . The method of  claim 11 , wherein the fiberglass core comprises an S-glass type fiberglass. 
     
     
         15 . The method of  claim 10 , wherein the third fiberglass layer comprises a fiberglass material different than the first fiberglass layer and different than the second fiberglass layer. 
     
     
         16 . The method of  claim 10 , wherein the heater wire further comprises a kapton layer, the kapton layer forming an outer layer and surrounding the third fiberglass layer. 
     
     
         17 . The method of  claim 16 , wherein the kapton layer comprises a polyimide film and silicone adhesive. 
     
     
         18 . The method of  claim 10 , wherein the resistive wire comprises a double resistive wire.