US2022128318A1PendingUtilityA1

Heat transfer tube for heat pump application

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Assignee: CARRIER CORPPriority: Oct 28, 2020Filed: Oct 20, 2021Published: Apr 28, 2022
Est. expiryOct 28, 2040(~14.3 yrs left)· nominal 20-yr term from priority
Inventors:Robert A. LefflerThomas S. VisalliLuis Felipe AvilaThomas BryantDuane V. DouglasRon A. WilsonLouis J. Sullivan
B21D 53/08B21D 5/12B21C 37/207B21C 37/0815B21C 37/065F25B 39/00F28F 1/40F28D 2021/0068F28F 1/32F28F 21/084F28F 1/42F28F 1/105
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Claims

Abstract

A heat transfer tube and a heat exchanger incorporating at least one heat transfer tubes are provided. The heat transfer tube and the heat exchanger are configured to operate in both a heating mode and a cooling mode (e.g., to optimize the reversible function a heat pump). The heat transfer tube includes a tube body with an interior surface and an exterior surface. The tube body defining an outer diameter (D o ) and a wall thickness (W T ), wherein a ratio (W T /D o ) the wall thickness (W T ) to the outer diameter (D o ) is between 0.061 and 0.071. The heat transfer tube includes a plurality of adjacent helical fins protruding circumferentially around the interior surface of the tube body, and at least one groove disposed between the plurality of adjacent helical fins. The configuration of the heat transfer tube(s) is optimal for the reversible function of the heat pump.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A heat transfer tube for operating in both a heating mode and a cooling mode, the heat transfer tube comprising:
 a tube body comprising an interior surface and an exterior surface, the tube body defining an outer diameter (D o ) and a wall thickness (W T ), wherein a ratio (W T /D o ) of the wall thickness (W T ) to the outer diameter (D o ) is between 0.061 and 0.071; and   a plurality of adjacent helical fins protruding circumferentially around the interior surface of the tube body, at least one groove disposed between the plurality of adjacent helical fins, each respective groove defining a groove width, each respective helical fin defining a fin height, a fin tip width, a fin base width, a fin apex angle, and a fin helix angle, wherein the interior surface of the tube body further comprises a non-fin weld area, the non-fin weld area defining a non-fin height and a non-fin width.   
     
     
         2 . The heat transfer tube of  claim 1 , wherein the heat transfer tube provides a Cavallini factor between 1.67 and 2.22. 
     
     
         3 . The heat transfer tube of  claim 1 , wherein the tube body is comprised of at least one of: an aluminum and an aluminum alloy. 
     
     
         4 . The heat transfer tube of  claim 1 , wherein a cross-section of the heat transfer tube defines between 41 and 48 helical fins. 
     
     
         5 . The heat transfer tube of  claim 1 , wherein the outside diameter is between 6.85 mm and 7.14 mm. 
     
     
         6 . The heat transfer tube of  claim 1 , wherein the wall thickness is between 0.410 mm and 0.510 mm. 
     
     
         7 . The heat transfer tube of  claim 1 , wherein the fin height is between 0.144 mm and 0.248 mm. 
     
     
         8 . The heat transfer tube of  claim 1 , wherein the fin tip width is between 0.096 mm and 0.156 mm. 
     
     
         9 . The heat transfer tube of  claim 1 , wherein the fin base width is between 0.18 mm and 0.24 mm. 
     
     
         10 . The heat transfer tube of  claim 1 , wherein the fin apex angle is between 19° and 35°. 
     
     
         11 . The heat transfer tube of  claim 1 , wherein the fin helix angle is between 13° and 23°. 
     
     
         12 . The heat transfer tube of  claim 1 , wherein the groove width is between 0.102 mm and 0.221 mm. 
     
     
         13 . A heat exchanger for operating in both a heating mode and a cooling mode, the heat exchanger comprising:
 a plurality of fins; and   at least one heat transfer tube configured to pass a fluid therethrough, the at least one heat transfer tube extending through the plurality of fins, each respective heat transfer tube comprising:
 a tube body comprising an interior surface and an exterior surface, the tube body defining an outer diameter (D o ) and a wall thickness (W T ), wherein a ratio (W T /D o ) the wall thickness (W T ) to the outer diameter (D o ) is between 0.061 and 0.071; and 
 a plurality of adjacent helical fins protruding circumferentially around the interior surface of the tube body, at least one groove disposed between the plurality of adjacent helical fins, each respective groove defining a groove width, each respective helical fin defining a fin height, a fin tip width, a fin base width, a fin apex angle, and a fin helix angle, wherein the interior surface of the tube body further comprises a non-fin weld area, the non-fin weld area defining a non-fin height and a non-fin width. 
   
     
     
         14 . The heat exchanger of  claim 13 , wherein the heat transfer tube provides a Cavallini factor between 1.67 and 2.22. 
     
     
         15 . The heat exchanger of  claim 13 , wherein the tube body is comprised of at least one of: an aluminum and an aluminum alloy. 
     
     
         16 . The heat exchanger of  claim 13 , wherein a cross-section of the heat transfer tube defines between 41 and 48 helical fins. 
     
     
         17 . The heat exchanger of  claim 13 , wherein the outside diameter is between 6.85 mm and 7.14 mm, and the wall thickness is between 0.410 mm and 0.510 mm. 
     
     
         18 . The heat exchanger of  claim 13 , wherein the fin height is between 0.144 mm and 0.248 mm, the fin tip width is between 0.096 mm and 0.156 mm, and the fin base width is between 0.18 mm and 0.24 mm. 
     
     
         19 . The heat exchanger of  claim 13 , wherein the fin apex angle is between 19° and 35°, and the fin helix angle is between 13° and 23°. 
     
     
         20 . The heat exchanger of  claim 13 , wherein the groove width is between 0.102 mm and 0.221 mm.

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