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Table 2.1 Comparison of components for residential system System Refrigerant Type Nominal capacity, A/C at 27/35, 50% Nominal capacity, heat pump at 22/8.2, dry R410A-A/C Only Commercial 10.5 kW Hermetic, Scroll Orifice tube: i.d. = 1.78 mm 1.42 m2 0.0185 m 0.026 m3 54.1 m2 1.5 m2 Aluminum plate fins Cu tubes, od = 9.5 mm 0.32 m2 .056 m 0.018 m3 18.6 m2 1.0 m2 Al. Wavy plate fins, Cu tubes, od = 9.5 mm R410A-A/C & HP Commercial 10.3 kW 9.8 kW Hermetic, Scroll Short tube orifice type 1.16 m2 0.0370 m 0.043 m3 66.9 m2 3.38 m2 Aluminum plate fins Cu tubes, od = 9.5 mm 0.42 m2 0.0565 m 0.024 m3 27.48 m2 1.31 m2 Al. Wavy plate fins, Cu tubes, od = 10 mm R744 Prototype 10.3 kW 9.8 kW Semi-Hermetic, Reciprocating Manual valve 3*0.53 = 1.59 m2 0.0165 m 3* 0.0088 = 0.026 m3 3*16.8 = 50.4 m2 3*1.37 = 4.1 m2 Aluminum tube, folded louvered fins 0.36 m2 3*0.0165 = .050 m2 3*0.006 = 0.018 m3 3*7.50 = 22.5 m2 3 * 0.91 = 2.73 m2 Aluminum tube, folded louvered fins Concentric tube, 2 parallel circuits in counterflow 2 m 0.0377 m2 0.0882 m2 Aluminum Compressor: Expansion device: Description One row, two circuits, fin pitch 1 mm (24 fpi), louvered wavy fins Three circuits, two slab, fin pitch 1.3 mm (20 fpi), louvered wavy fins Three brazed 6 pass slabs with 80 tubes each, connected in parallel for R744. Extruded 11 port micro-channel tube. (see fig.2) Outdoor coil Face area Core depth Core volume Airside area Ref. Side area Material Face area Core depth Core volume Air side area Ref. Side area Material Description Length High Pressure Area Low Pressure Area Material Description Plate fins, three rows, six circuits, fin pitch 1.8 mm (14 fpi) Louvered plate fins, three rows, six circuits, fin pitch 1.7 mm (15.2 fpi) Three single pass slabs with 21 tubes each, connected in series for air flow, and in series for R744 h/p and parallel for R744 a/c. Brazed 11 port microchannel tube. (see fig. 3) Indoor coil Suction Line Heat Exch. 4PDF Image | Comparison of R744 and R410A
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