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Figure A.8 R744 outdoor six pass microchannel heat exchanger slab.................................................................................56 Figure A.9 R744 sight glass. Note the presence of liquid R744 at the bottom of the viewing area...............................57 Figure A.10 The R744 suction accumulator. The black tube pointed at the bottom of the viewing area is actually a fiber optic light source used to improve viewability .....................................................................................58 Figure B.1 Arrangement of suction accumulator for R744 RAC1 comparison with R410A: liquid-vapor lines intersect below level in accumulator..................................................................................................................................59 Figure B.2 Comparison of capacity and efficiency with re-orientation of indoor coil and adjustment of suction accumulator.............................................................................................................................................................................60 Figure B.3 Compressor power for capacity/efficiency results...............................................................................................61 Figure B.4 Evaporating temperature (at inlet to evaporator) .................................................................................................62 Figure B.5 Ratio of calculated heat transfer in internal heat exchanger from high pressure side to low pressure side assuming no phase change...........................................................................................................................................63 FigureC.1 Calculatedconcentrationdependenceontemperaturewithfixeddensity.......................................................66 Figure C.2 Calculated concentration dependence on density with fixed temperature .......................................................67 Figure C.3 Calculated specific heat dependence on concentration.......................................................................................67 Figure D.1 Low pressure receiver...............................................................................................................................................69 Figure D.2 High pressure receiver..............................................................................................................................................70 Figure D.3 Comparison of effect of high and low pressure receiver on ideal R410A subcritical cycle ........................71 Figure D.4 Flash Gas Bypass.......................................................................................................................................................71 Figure E.1 Graphic psychrometric determination of evaporator surface temperature .......................................................74 Figure E.2 Evaporating temperature dependence on inlet conditions for a given sensible heat ratio (R744) ...............76 Figure E.3 Capacity control for finite heat exchange area by varying air flow rate (R744).............................................76 xPDF Image | Comparison of R744 and R410A
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