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A heat transfer device includes a tube with a first fluid inlet and outlet and is arranged to form a plurality of parallel elongated segments. An enclosure defines a second fluid flow path over an exterior surface of the tube from a second fluid inlet to a second fluid outlet. A wall in the enclosur

A heat transfer device includes a tube with a first fluid inlet and outlet and is arranged to form a plurality of parallel elongated segments. An enclosure defines a second fluid flow path over an exterior surface of the tube from a second fluid inlet to a second fluid outlet. A wall in the enclosure defines a first section of the second fluid flow path, which first section leads from the second fluid inlet and extends across a first portion of a length of all of the elongated segments of the tube. The wall further defines a second section of the second fluid flow path in the enclosure, which second section extends across a second portion of the length of all of the elongated segments of the tube and leads to the second fluid outlet. The interior wall is shaped and arranged such that a cross sectional area of the second fluid flow path in the enclosure changes along its length from the second fluid inlet to the second fluid outlet.

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The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A heat transfer device comprising: a tube having a first fluid inlet and a first fluid outlet, the tube arranged to form a plurality of generally parallel elongated segments of the tub

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A heat transfer device comprising: a tube having a first fluid inlet and a first fluid outlet, the tube arranged to form a plurality of generally parallel elongated segments of the tube, an enclosure enclosing the tube to define at least a part of a flow path for a second fluid over an exterior surface of the tube from a second fluid inlet to a second fluid outlet, a wall interior of the enclosure to define a first section of the flow path for the second fluid in the enclosure which first section leads from the second fluid inlet and extends across at least a first portion of a length of substantially all of the elongated segments of the tube, the wall further defining a second section of the flow path for the second fluid in the enclosure which second section extends across at least a second portion of the length of substantially all of the elongated segments of the tube and leads to the second fluid outlet, the interior wall being shaped and arranged in the enclosure such that a cross sectional area of the flow path for the second fluid in the enclosure changes along its length from the second fluid inlet to the second fluid outlet. 2. The heat transfer device according to claim 1, wherein the elongated segments of the tube are connected to each other in series in a serpentine path. 3. The heat transfer device according to claim 1, wherein an interior of the enclosure is substantially rectangular with a generally constant cross-sectional area along its height and long its length. 4. The heat transfer device according to claim 1, wherein the first section of the flow path for the second fluid extends in a first direction substantially perpendicular to the length of the elongated segments and the second section of the flow path for the second fluid extends in a second, opposite direction also substantially perpendicular to the length of the elongated segments. 5. The heat transfer device according to claim 1, wherein the wall is substantially planar and is arranged at an angle to the length of the elongated segments of the tube. 6. The heat transfer device according to claim 1, wherein the wall has a zig-zag shape with an alternating series of sections parallel and perpendicular to the length of the straight segments of the tube. 7. The heat transfer device according to claim 1, further including a plurality of fins arranged in engagement with the exterior surface of the tube, each fin lying in a plane generally perpendicular to the length of the elongated segments of the tube, the fins arranged to guide the second fluid flowing over the exterior surface of the tube to effect a heat transfer from one of the fluids to the other via thermal conduction through the fins and tube. 8. The heat transfer device according to claim 1, wherein the heat transfer device forms a portion of at least one of an evaporator and a condenser in a refrigeration appliance. 9. The heat transfer device according to claim 1, wherein the first section of the flow path for the second fluid has a downstream end at one end of the wall with a cross sectional area substantially identical to a cross sectional area of the second section of the flow path for the second fluid at an upstream end at the same end of the wall. 10. The heat transfer device according to claim 1, wherein the cross sectional area of the flow path for the second fluid in the enclosure decreases along its length from the second fluid inlet to the second fluid outlet. 11. A heat transfer device comprising: a tube arranged in a serpentine path of elongated straight segments joined by u-shaped returns to form a plurality of parallel straight segments of the tube to carry a first fluid from a first fluid inlet to a first fluid outlet, a plurality of fins arranged in engagement with an exterior surface of the tube, each fin lying in a plane generally perpendicular to a length of the straight segments of the tube, the fins arranged to guide a second fluid flowing over the exterior surface of the tube to effect a heat transfer from one of the fluids to the other via thermal conduction through the fins and tube, an enclosure enclosing the tube and fins to define at least a part of a flow path for the second fluid in a region of the tube and fins from a second fluid inlet to a second fluid outlet, a wall interior of the enclosure to define a first section of the flow path for the second fluid in the enclosure which first section leads from the second fluid inlet and extends in a first direction substantially perpendicular to a length of the elongated segments of the tube, the wall further defining a second section of the flow path for the second fluid in the enclosure which second section extends in an opposite direction from the first section substantially perpendicular to the length of the elongated segments of the tube and leads to the second fluid outlet, the interior wall being shaped and arranged in the enclosure such that a cross sectional area of the flow path for the second fluid in the enclosure changes along its length from the second fluid inlet to the second fluid outlet. 12. The heat transfer device according to claim 11, wherein an interior of the enclosure is substantially rectangular with a generally constant cross-sectional area along its height and long its length. 13. The heat transfer device according to claim 11, wherein the wall is substantially planar and is arranged at an angle to the length of the elongated segments of the tube. 14. The heat transfer device according to claim 11, wherein the wall has a zig-zag shape with an alternating series of sections parallel and perpendicular to the length of the straight segments of the tube. 15. The heat transfer device according to claim 11, wherein the heat transfer device forms a portion of at least one of an evaporator and a condenser in a refrigeration appliance. 16. The heat transfer device according to claim 11, wherein the first section of the flow path for the second fluid has a downstream end at one end of the wall with a cross sectional area substantially identical to a cross sectional area of the second section of the flow path for the second fluid at an upstream end at the same end of the wall. 17. The heat transfer device according to claim 11, wherein the cross sectional area of the flow path for the second fluid in the enclosure decreases along its length from the second fluid inlet to the second fluid outlet. 18. The heat transfer device according to claim 11, wherein the first section of the flow path for the second fluid extends across at least a portion of the length of substantially all of the elongated segments of the tube and the second section of the flow path for the second fluid extends across at least a portion of the length of substantially all of the elongated segments of the tube. 19. A refrigeration appliance having a refrigeration circuit with a compressor, a condenser and an evaporator, wherein at least one of the condenser and evaporator includes a heat transfer device comprising: a tube having a first fluid inlet and a first fluid outlet, the tube arranged to form a plurality of generally parallel elongated segments of the tube, an enclosure enclosing the tube to define at least a part of a flow path for a second fluid over an exterior surface of the tube from a second fluid inlet to a second fluid outlet, a wall interior of the enclosure to define a first section of the flow path for the second fluid in the enclosure which first section leads from the second fluid inlet and extends across at least a first portion of a length of substantially all of the elongated segments of the tube, the wall further defining a second section of the flow path for the second fluid in the enclosure which second section extends across at least a second portion of the length of substantially all of the elongated segments of the tube and leads to the second fluid outlet, the interior wall being shaped and arranged in the enclosure such that a cross sectional area of the flow path for the second fluid in the enclosure changes along its length from the second fluid inlet to the second fluid outlet.