Claims
- 1. A refrigerator having a refrigeration compartment to be cooled and a refrigeration system, said refrigeration system comprising:
- an evaporator arranged in heat transfer with objects in said refrigeration compartment;
- a compressor; a condenser coil being disposed below said refrigeration compartment, said condenser coil further comprising:
- a serpentine tube having a plurality of U-shaped tube passes, each pass having two substantially straight tube sections joined by a U-shaped bend section, said straight tube sections oriented across a width of said serpentine tube, wherein fluid flow inside said serpentine tube makes alternate back and forth passes in a direction along said width of said serpentine tube, progressing along a length of said serpentine tube, and
- an extended heat transfer surface arranged connected to said straight tube sections across said length of said serpentine tube; and
- tubing means for fluidly interconnecting said evaporator, compressor and condenser coil; and
- an air transport means for moving air over said serpentine tube in a direction perpendicular to said tube passes and counter to the progression of said fluid along said length of said serpentine tube.
- 2. The refrigeration system according to claim 1, wherein said extending heat transfer surface comprises a plurality of wires wrapped around a length of said serpentine tube.
- 3. The refrigeration system according to claim 1, wherein said extending heat transfer surface comprises a flat plate attached to said U-shaped tube passes.
- 4. The refrigeration system according to claim 1, wherein said serpentine tube further comprises:
- two tiers formed by folding said U-shaped tube passes along a lengthwise line, wherein said flow inside said tube makes alternate back and forth passes between tiers along said width of said serpentine tube.
- 5. The refrigerator system according to claim 4, wherein said two tiers are formed by folding said U-shaped passes at substantially a mid-point of each tube pass width.
- 6. The refrigeration system according to claim 4 wherein said extended heat transfer surface is arranged connected to each tier but is not present at said fold in said U-shaped tube passes.
- 7. The refrigeration system according to claim 1, wherein said extending heat transfer surface comprises a plurality of elongate wires welded lengthwise across said coiled tube at increments along the width of each of said straight tube sections.
- 8. A refrigerator comprising:
- a refrigeration compartment for holding objects;
- a compressor;
- an evaporator arranged in heat transfer with objects in said refrigeration compartment;
- a condenser coil;
- an equipment compartment disposed below said refrigeration compartment, said compressor and said condenser coil being disposed in said equipment compartment;
- tubing means for fluidly interconnecting said evaporator, compressor and condenser coil such that said compressor moves refrigerant through said condenser and said evaporator;
- wherein said condenser coil comprises:
- a serpentine tube formed of substantially parallel runs of tubing, each adjacent pair of runs interconnected by a bend, said serpentine tube having a width extending between opposite bends, said serpentine tube being folded between said opposite bends to form two overlying tiers of tubing runs, said tubing runs having a folded width greater than a distance between adjacent overlying tiers, said serpentine tube having a length perpendicular to said width, wherein refrigerant flow inside said serpentine tube makes alternate back and forth passes in a direction along said width of said serpentine tube, progressing along said length of said serpentine tube, said condenser coil being disposed within said equipment compartment such that said two tiers extend beneath said refrigerator compartment, said compressor moving refrigerant through said condenser coil such that the progression of refrigerant is toward the front of said equipment compartment, and
- an extended heat transfer surface arranged connected to said tiers and spanning across said length of said serpentine tube; and
- a fan disposed in said equipment compartment for drawing air from the front of said refrigerator over said condenser such that air flow over said condenser coil is counter to the progression of said refrigerant in said condenser.
- 9. The refrigerator according to claim 8, wherein said extending heat transfer surface comprises a plurality of wires wrapped around a length of each of said tiers incrementally along said width of said serpentine tube.
- 10. The refrigeration system according to claim 8, wherein said extending heat transfer surface comprises a U-shaped plate attached to each of said two tiers.
- 11. The refrigerator according to claim 8, wherein said serpentine shape is folded at approximately a half width of said serpentine shape and said overlying tiers have equal widths.
Parent Case Info
This is a continuation of application Ser. No. 08/115,624, filed Sep. 3, 1993.
US Referenced Citations (21)
Non-Patent Literature Citations (1)
Entry |
Pp. 511 and 512, copied from "Fundamentals of Heat Transfer", Copyright 1981, published by John Wiley and Sons, Authors Frank P. Incropera and David P. Dewitt. |
Continuations (1)
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Number |
Date |
Country |
Parent |
115624 |
Sep 1993 |
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