Corrugated indirect water heater coil

Abstract

A corrugated indirect heating coil is disclosed. The heating coil includes an intake and an exhaust. Tubing connects the intake and exhaust together in fluid communication. The tubing includes a plurality of corrugations formed thereon to maximize surface area for heat exchange. The tubing is preferably wound into coils and supported by a frame.

What is claimed is: 
     
         1 . A heating coil, comprising:
 an intake;   an exhaust; and   tubing connecting the intake and exhaust in fluid communication, the tubing including a plurality of corrugations.   
     
     
         2 . The heating coil of  claim 1 , wherein the tubing is wound into a plurality of coils. 
     
     
         3 . The heating coil of  claim 2 , wherein an outer diameter of the coils of the tubing is about 12.44″ to about 15.74″. 
     
     
         4 . The heating coil of  claim 2 , wherein an outer diameter of the coils of the tubing is about 12.25″. 
     
     
         3 . The heating coil of  claim 2 , wherein the coils are supported by a frame. 
     
     
         4 . The heating coil of  claim 1 , wherein the intake includes a threaded end. 
     
     
         5 . The heating coil of  claim 1 , wherein the exhaust includes a threaded end. 
     
     
         6 . The heating coil of  claim 1 , wherein the corrugations have a variation of between about 1.380″ to about 1.728″, at a troth of the corrugation, to about 1.618″ to about 2.023″ at a peak of the corrugation. 
     
     
         7 . The heating coil of  claim 6 , wherein the corrugations have a variation between a troth and a peck of the corrugation of between about 1.392″ to about 1.601″. 
     
     
         8 . The heating coil of  claim 1 , wherein the tubing is formed from straight tubing having an exterior diameter of about 1.5″ and an interior diameter of about 1.375″. 
     
     
         9 . The heating coil of  claim 1 , wherein the tubing has a thickness of between about 0.0112″ and about 0.0148″. 
     
     
         10 . The heating coil of  claim 1 , wherein the tubing has an inner diameter of between about 1.358″ to about 1.698″.