Method of producing multiple coil, multiple tube heat exchanger

A method of producing a multiple coil, liquid to liquid heat exchanger, wherein said coils are essentially concentric and are formed of multiple tubes, generally circular in cross section, in alternating longitudinal succession and through which a different liquid is circulated for transfer of heat to or from the liquid in adjoining tubes, comprising:

• winding a first set of alternating, individual tubes simultaneously and in essentially abutting relation longitudinally to form a generally cylindrical inner coil;
• applying a heat conductive mastic to the outside of said inner coil;
• winding a second and corresponding set of individual tubes simultaneously and in essentially abutting relation longitudinally to form a second coil surrounding said inner coil, said second set of tubes being wound against the tubes of said first coil so as to press said tubes of said second coil against said tubes of said first coil and simultaneously compress the mastic layer and force said mastic into the spaces between adjoining tubes of said first coil, into the spaces between adjoining tubes of said second coil and into the spaces between generally opposed tubes of said first and second coils;
• applying a heat conductive mastic to the outside of said second coil;
• winding a third and corresponding set of individual tubes simultaneously and in essentially abutting relation longitudinally to form a third coil surrounding said second coil, said third set of tubes being wound against the tubes of said second coil so as to press said tubes of said third coil against the tubes of said second coil and simultaneously compress said mastic layer and force said mastic into the spaces between adjoining tubes of said second coil, into the spaces between adjoining tubes of said third coil and into the spaces between generally opposed tubes of said second and third coils;
• the tubes of at least a plurality of coils have essentially the same diameter and winding succeeding outer coils by engaging the first turn of each coil with the groove between the first and second turns of the previous coil;
• at the opposite end of each succeeding outer coil, leading the last turn of said coil away from said coil at a position between the second from last and third from last turns of the next inner coil;
• and
• similarly applying mastic to the outside of a coil and winding a set of tubes simultaneously to form the next outer coil and force said mastic into the space between adjoining tubes of said previous coil, into the spaces between adjoining tubes of said next outer coil and into the spaces between generally opposed tubes of said previous coil and said next outer coil.

A method of producing a multiple coil liquid to liquid heat exchanger, wherein said coils are essentially concentric and are formed of multiple tubes, generally circular in cross section, in alternating longitudinal succession and through which a different liquid is circulated for transfer of heat to or from the liquid in adjoining tubes, comprising:

• winding a first set of alternating, individual tubes in essentially abutting relation longitudinally to form a generally cylindrical inner coil;
• applying a heat conductive mastic to the outside of said inner coil;
• winding a second and corresponding set of individual tubes in essentially abutting relation longitudinally to form a second coil surrounding said inner coil, said set of tubes being wound against the tubes of said first coil so as to press said tubes of said second coil against said tubes of said first coil and simultaneously compress the mastic layer and force said mastic into the spaces between adjoining tubes of said second coil and into the spaces between generally opposed tubes of said first and second coils;
• applying a heat conductive mastic to the outside of said second coil;
• winding a third and corresponding set of individual tubes in essentially abutting relation longitudinally to form a third coil surrounding said second coil, said third set of tubes being wound against the tubes of said second coil so as to press said tubes of said third coil against the tubes of said second coil and simultaneously compress said mastic layer and force said mastic into the spaces between adjoining tubes of said second coil, into the spaces between adjoining tubes of said third coil and into the spaces between generally opposed tubes of said second and third coils;
• restraining, on one side of said coils and at closely adjacent points, the tubes extending to the first turn of each coil and carrying a first liquid;
• restraining on the opposite side of said coils and at closely adjacent points, the tubes extending to a second turn of each coil and carrying a second liquid;
• similarly applying mastic to the outside of a coil and winding a set of tubes to form the next outer coil and force said mastic into the space between adjoining tubes of said previous coil, into the spaces between adjoining tubes of said next outer coil and into the spaces between generally opposed tubes of said previous coil and said next outer coil;
• and
• similarly restraining the tubes extending to the first and second turns of said coils.

A method of producing a multiple coil, liquid to liquid heat exchanger, wherein said coils are essentially concentric and are formed of multiple tubes, generally circular in cross section, in alternating longitudinal succession and through which a different liquid is circulated for transfer of heat to or from the liquid in adjoining tubes, comprising:

• winding a first set of alternating, individual tubes in essentially abutting relation longitudinally to form a generally cylindrical inner coil;
• applying a heat conductive mastic to the outside of said inner coil;
• winding a second and corresponding set of individual tubes in essentially abutting relation longitudinally to form a second coil surrounding said inner coil, said second set of tubes being wound against the tubes of said first coil so as to press said tubes of said second coil against said tubes of said first coil and simultaneosuly compress the mastic layer and force said mastic into the spaces between adjoining tubes of said first coil, into the spaces between adjoining tubes of said second coil and into the spaces between generally opposed tubes of said first and second coils;
• applying a heat conductive mastic to the outside of said second coil;
• winding a third and corresponding set of individual tubes in essentially abutting relation longitudinally to form a third coil surrounding said second coil, said third set of tubes being wound against the tubes of said second coil so as to press said tubes of said third coil against the tubes of said second coil and simultaneously compress said mastic layer and force said mastic into the spaces between adjoining tubes of said second coil, into the spaces between adjoining tubes of said third coil and into the spaces between generally opposed tubes of said second and third coils;
• similarly applying mastic to the outside of a coil and winding a set of tubes to form the next outer coil and force said mastic into the space between adjoining tubes of said next outer coil and into the spaces between generally opposed tubes of said previous coil and said next outer coil;
• winding the inner coil on a mandrel and the remaining coils against the next inner coil;
• attaching the outside of a plurality of turns of the inner coil, including the first turn and the last turn, to the outside of an adjacent turn;
• and
• attaching the outside of at least the first turn and the last turn of each outer coil to the outside of the adjacent turn of the next inner coil, prior to winding the next outer coil.