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1. A cooling unit, comprising: C-shaped side frames (10) disposed spaced apart and on opposing ends of an entire width of the cooling unit, wherein the side frames are support frames, and each of the side frames is a frame profile including a rear vertical profile (10.1) and a lower and upper horizontal profile (10.2, 10.3) protruding forward from the rear vertical profile; a rear wall group (12) with a thermally insulating outer casing (12.3) mounted at opposing side edges on and between the vertical profiles (10.1), a base group (11) mounted on and bet...
1. A cooling unit, comprising: C-shaped side frames (10) disposed spaced apart and on opposing ends of an entire width of the cooling unit, wherein the side frames are support frames, and each of the side frames is a frame profile including a rear vertical profile (10.1) and a lower and upper horizontal profile (10.2, 10.3) protruding forward from the rear vertical profile; a rear wall group (12) with a thermally insulating outer casing (12.3) mounted at opposing side edges on and between the vertical profiles (10.1), a base group (11) mounted on and between the lower horizontal profiles (10.2), and an upper group (13) mounted on and between the upper horizontal profiles (10.3), the rear wall group (12), the base group (11), and the upper group (13) connecting the spaced apart side frames together; the groups enclosing a cooling chamber (4) from behind, below, and above; andat least the thermally insulating outer casing (12.3) of the rear wall group (12) attached to an inside of the vertical profile oriented toward the cooling chamber (4). 2. The cooling unit according to claim 1, wherein the lower horizontal profiles (10.2) have feet (60, 61) for supporting on a floor and for compensating for differences in heights. 3. The cooling unit according to claim 2, wherein a support profile (10.4) is built into each side frame (10), extending between the lower and upper horizontal profile (10.2, 10.3) in a rear region, and spaced apart from and forward of the vertical profile (10.1). 4. The cooling unit according to claim 3, wherein each respective support profile (10.4) of metal is installed and supported in relation to the lower and upper horizontal profile (10.2, 10.3) without a metallic connection by thermally insulating intermediate pieces (10.41, 10.51). 5. The cooling unit according to claim 4, wherein the support profiles (10.4) have rows of holes in a predetermined spacing pattern, into which support arms for shelves are hooked that protrude forward into the cooling chamber (4). 6. The cooling unit according to claim 5, wherein the cooling unit is C-shaped when viewed from a side; the base group (11) has a thermally insulating deflector plate (11.2) that is attached to the two lower horizontal profiles (10.2), the upper group (13) has a thermally insulating plate-shaped upper cover (13.3) attached to the two upper horizontal profiles (10.3), and each of the outer casing (12.3), the deflector plate (11.2), and the upper cover (13.3) is situated on the inside of the frame profiles and oriented toward the cooling chamber (4). 7. The cooling unit according to claim 6, wherein a rear edge of the thermally insulating deflector plate (11.2) attached to the two lower horizontal profiles adjoins the lower edge of the outer casing (12.3) directly or indirectly by transition elements and a rear edge of the thermally insulating plate-shaped upper cover (13.3) adjoins the upper edge of the outer casing (12.3) directly or indirectly by other transition elements. 8. The cooling unit according to claim 7, wherein an evaporator (50, 50′, 50″) or other heat exchanger for cooling the cooling chamber (4) is situated in a chamber of the rear wall group (12) between the front side of the outer casing (12.3) and a plane formed by the front side of the support profiles (10.4), and the evaporator (50, 50′, 50″) or other heat exchanger is attached to the front side of the outer casing (12.3) by a support device. 9. The cooling unit according to claim 8, wherein the chamber of the rear wall group (12) contains at least one fan (56) for producing a cold air flow that is acted on with cooling power by the evaporator (50, 50′, 50″) or other heat exchanger and at least part of the cold air flow is conveyed into the cooling chamber (4). 10. The cooling unit according to claim 9, wherein the rear wall group (12), the base group (11), and/or the upper group (13) has a layered structure with a plurality of plate-shaped wall elements that are spaced apart from one another and produce at least one intermediate space for routing an air flow. 11. The cooling unit according to claim 10, wherein the respective plate-shaped wall elements are embodied on the outer casing (12.3), on the top side of the deflector plate (11.2), and/or on the underside of the upper cover (13.3), respectively on the side oriented toward the cooling chamber. 12. The cooling unit according to claim 11, wherein the plate-shaped wall elements of the upper group (13) are mounted by thermally insulating support pins (13.6) fastened to the underside of the horizontal profiles (10.3) on both sides. 13. The cooling unit according to claim 12, wherein inner intermediate chambers close to the cooling chamber and connected to one another for a cold air flow and outer flow conduits are spaced apart from the cooling chamber (4) and connected to one another for a warm air flow are in the rear wall group (12), the upper group (13), and the base group (11) and the circulating air flows on the front side of the cooling unit produce a cold air loop (70) by the cold air flow and a warm air loop (71) by the warm air flow, achieving an insulation of the cooling chamber (4) relative to the surroundings. 14. A method for constructing a cooling unit according to claim 1, wherein two of the C-shaped side frames (10) are produced, each with a vertical profile (10) and the lower and upper horizontal profile (10.2, 10.3) protruding forward from the rear vertical profile; a deflector plate (11.2) made of a thermally insulating material and belonging to a base group (11) is mounted onto the lower horizontal profiles (10.2), a thermally insulating outer casing (12.3) belonging to a rear wall group (12) is mounted onto the front side of the vertical profiles (10.1), and a thermally insulating upper cover (13.3) belonging to an upper group (13) is mounted onto the underside of the upper horizontal profiles (10.3); spaced apart from a top side of the deflector plate (11.2), the front side of the outer casing (12.3), and the underside of the upper cover (13.3), plate-shaped wall elements are installed for routing an air flow, where components of a cooling device (5) are incorporated at least into the rear wall group (12); and support profiles (10.4) are installed spaced apart from the front side of the vertical profiles (10.1) in parallel fashion, between the rear regions of the lower and upper horizontal profiles (10.2, 10.3). 15. A system including a plurality of the cooling units according to claim 12, wherein a plurality of cooling units (1, 2, 3) aligned next to one another in a row are connected to one another at their adjacent side frames (10); sealing components are inserted between the base groups (11), rear wall groups (12), the upper groups (13) of adjacent cooling units. 16. The system according to claim 15, wherein spacer elements are inserted between the adjacent side frames (10) that are clamped to each other and the sealing elements are inserted between the narrow edges that face one another on the thermally insulating outer casing (12.3), the thermally insulating deflector plates (11.2), and the thermally insulating upper cover (13.3). 17. The cooling unit according to claim 1, further comprising a support profile (10.4) built into each side frame (10), extending between the lower and upper horizontal profile (10.2, 10.3) in a rear region, and spaced apart from and forward of the vertical profile (10.1). 18. The cooling unit according to claim 3, wherein the support profiles (10.4) have rows of holes in a predetermined spacing pattern, into which support arms for shelves are hooked that protrude forward into the cooling chamber (4). 19. The cooling unit according to claim 1, wherein the cooling unit is C-shaped when the base group (11), the rear wall group (12), and the upper group (13) that enclose the cooling chamber (4) from behind, below, and above, and have at least part of the components of a cooling device (5), are viewed from a side; the base group (11) has a thermally insulating deflector plate (11.2) that is attached to the two lower horizontal profiles (10.2), and the upper group (13) has a thermally insulating plate-shaped upper cover (13.3) attached to the two upper horizontal profiles (10.3); and each of the outer casing (12.3), the deflector plate (11.2), and the upper cover (13.3) is situated on the inside of the frame profiles and oriented toward the cooling chamber (4). 20. The cooling unit according to claim 3, wherein an evaporator (50, 50′, 50″) or other heat exchanger for cooling the cooling chamber (4) is situated in a chamber of the rear wall group (12) between the front side of the outer casing (12.3) and a plane formed by the front side of the support profiles (10.4), and the evaporator (50, 50′, 50″) or other heat exchanger is attached to the front side of the outer casing (12.3) by a support device. 21. The cooling unit according to claim 1, wherein the rear wall group (12), the base group (11), and/or the upper group (13) has a layered structure with a plurality of plate-shaped wall elements that are spaced apart from one another and produce at least one intermediate space for routing an air flow. 22. The cooling unit according to claim 1, wherein at least the rear wall group (12) encloses both an inner intermediate chamber close to the cooling chamber for a cold air flow and an outer flow conduit on an opposite side of the inner intermediate chamber from the cooling chamber (4) and between the inner intermediate chamber and the thermally insulating cover for a warm air flow, wherein the upper group (13), the base group (11), and circulating air flows on the front side of the cooling unit produce a cold air loop (70) by the cold air flow and a warm air loop (71) by the warm air flow, achieving an insulation of the cooling chamber (4) relative to the surroundings. 23. A system including a plurality of the cooling units according to claim 1, wherein the plurality of the cooling units (1, 2, 3) aligned next to one another in a row have adjacent side frames (10) connected to one another; sealing components are inserted between the base groups (11), rear wall groups (12), the upper groups (13) of adjacent cooling units. 24. A cooling unit, comprising: two C-shaped side frames (10) spaced apart and situated on opposing sides of the cooling unit, each of the C-shaped side frames being a support frame with a frame profile including a rear vertical profile (10.1), a lower horizontal profile (10.2), and an upper horizontal profile (10.3), the lower and upper horizontal profiles each protruding forward from the rear vertical profile; a rear wall group (12) including an inner cover (12.1), a thermally insulating outer casing (12.3), and two separate air flow spaces enclosed between the inner cover (12.1) and the outer casing (12.3), the outer casing (12.2) mounted at opposing side edges on inside surfaces of, and extending between, the rear vertical profiles (10.1), wherein the inner cover (12.1) is on a side of the outer casing (12.3) that is opposite the rear vertical profiles (10.1);a base group (11) including a thermally insulating lower plate mounted on inside surfaces of, and extending between, the lower horizontal profiles (10.2);an upper group (13) including a thermally insulating upper plate mounted on inside surfaces of, and extending between, the upper horizontal profiles (10.3); andthe groups enclosing a cooling chamber (4) from behind, below, and above; anda cooling device at least partially housed by the cooling unit and in cooling combination with the cooling chamber (4).
