Refrigeration door system and door assembly with defrosting and related methods

1. A refrigeration door system with a defrosting feature, the refrigeration door system comprising:

a housing defining a refrigerated cavity therein; and

a door assembly carried by the housing and providing access to the refrigerated cavity;

the door assembly comprising

a door frame and a sliding door coupled to the door frame, the sliding door switching between an open position providing the access to the refrigerated cavity and a closed position where the refrigerated cavity is inaccessible,

the door frame comprising

a top member having a first end and a second end opposite the first end,

a first side member coupled transversely to the first end of the top member and having a side conduit therein,

a second side member coupled transversely to the second end of the top member, and

a medial member coupled transversely to the top member between the first end and the second end of the top member, the medial member having a medial conduit therein,

at least one heated pressure source coupled to the top member and configured to output heated air into the side conduit and the medial conduit, and

a distal molding section carried by the first side member cooperating with the first side member to define the side conduit when the sliding door is in the closed position, the distal molding section comprising distal molding strip adjacent an outer surface of the sliding door.

2. The refrigeration door system of claim 1 wherein the door assembly comprises a proximal molding section adjacent a proximal end of the sliding door and cooperating with the medial member to define the medial conduit when the sliding door is in the closed position; and wherein the proximal molding section comprises first and second proximal molding strips adjacent the outer surface of the sliding door.

3. The refrigeration door system of claim 2 wherein when the sliding door is in the closed position, the proximal molding section is aligned with the medial member, and the distal molding section is aligned with a distal edge of the sliding door.

4. The refrigeration door system of claim 1 wherein the door assembly further comprises an upper molding section carried by the top member.

5. The refrigeration door system of claim 1 wherein the sliding door comprises first and second door sweeps carried on a bottom edge of the sliding door to define a longitudinal channel fluidly coupled to the side conduit and the medial conduit when the sliding door is in the closed position.

6. The refrigeration door system of claim 1 wherein the first side member comprises an external conduit fluidly coupled to the side conduit and having an outlet adjacent a floor.

7. The refrigeration door system of claim 1 wherein the door assembly further comprises an upper track coupled to the top member and for slidingly carrying the sliding door.

8. The refrigeration door system of claim 1 wherein the at least one heated pressure source comprises an elongate resistive heating device, and a fan adjacent to the elongate resistive heating device.

9. A door assembly for a refrigeration door system with a defrosting feature, the door assembly comprising:

a door frame;

a sliding door coupled to the door frame, the sliding door switching between an open position providing access to a refrigerated cavity and a closed position where the refrigerated cavity is inaccessible;

the door frame comprising

a top member having a first end and a second end opposite the first end,

a first side member coupled transversely to the first end of the top member and having a side conduit therein,

a second side member coupled transversely to the second end of the top member, and

a medial member coupled transversely to the top member between the first end and the second end of the top member, the medial member having a medial conduit therein;

at least one heated pressure source coupled to the top member and configured to output heated air into the side conduit and the medial conduit; and

a distal molding section carried by the first side member cooperating with the first side member to define the side conduit when the sliding door is in the closed position, the distal molding section comprising distal molding strip adjacent an outer surface of the sliding door.

10. The door assembly of claim 9 further comprising a proximal molding section adjacent a proximal end of the sliding door and cooperating with the medial member to define the medial conduit when the sliding door is in the closed position; and wherein the proximal molding section comprises first and second proximal molding strips adjacent the outer surface of the sliding door.

11. The door assembly of claim 10 wherein when the sliding door is in the closed position, the proximal molding section is aligned with the medial member, and the distal molding section is aligned with a distal edge of the sliding door.

12. The door assembly of claim 9 wherein the door assembly further comprises an upper molding section carried by the top member.

13. The door assembly of claim 9 wherein the sliding door comprises first and second door sweeps carried on a bottom edge of the sliding door to define a longitudinal channel fluidly coupled to the side conduit and the medial conduit when the sliding door is in the closed position.

14. The door assembly of claim 9 wherein the first side member comprises an external conduit fluidly coupled to the side conduit and having an outlet adjacent a floor.

15. The door assembly of claim 9 further comprising an upper track coupled to the top member and for slidingly carrying the sliding door.

16. A method for making a refrigeration door system with a defrosting feature, the method comprising:

coupling a door assembly to be carried by a housing and providing access to a refrigerated cavity, the door assembly comprising

a door frame and a sliding door coupled to the door frame, the sliding door switching between an open position providing the access to the refrigerated cavity and a closed position where the refrigerated cavity is inaccessible,

the door frame comprising

a top member having a first end and a second end opposite the first end,

a first side member coupled transversely to the first end of the top member and having a side conduit therein,

a second side member coupled transversely to the second end of the top member, and

a medial member coupled transversely to the top member between the first end and the second end of the top member, the medial member having a medial conduit therein;

positioning at least one heated pressure source coupled to the top member and configured to output heated air into the side conduit and the medial conduit;

the door assembly comprising a distal molding section carried by the first side member cooperating with the first side member to define the side conduit when the sliding door is in the closed position, the distal molding section comprising distal molding strip adjacent an outer surface of the sliding door.

17. The method of claim 16 wherein the door assembly comprises a proximal molding section adjacent a proximal end of the sliding door and cooperating with the medial member to define the medial conduit when the sliding door is in the closed position; and wherein the proximal molding section comprises first and second proximal molding strips adjacent the outer surface of the sliding door.

18. The method of claim 17 wherein when the sliding door is in the closed position, the proximal molding section is aligned with the medial member, and the distal molding section is aligned with a distal edge of the sliding door.

19. The method of claim 16 wherein the door assembly further comprises an upper molding section carried by the top member.

20. The method of claim 16 further comprising coupling first and second door sweeps carried on a bottom edge of the sliding door to define a longitudinal channel fluidly coupled to the side conduit and the medial conduit when the sliding door is in the closed position.