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Table 4.1 Comparison of cycle assumptions based on the 8.3oC/21oC heat pump rating condition, dry coil, supply air temperature 40oC Geometry Ref side area1 (m2/kW) Air side area1 ( m2 / k W ) Air to Ref Area Ratio Ref side pressure drop (kPa) Air side pressure drop (kPa) Air Flow Rate (m3/sec) Geometry Ref side area 1 (m2/kW) Air side area 1 (m2/kW) Air to Ref Area Ratio Ref side pressure drop (kPa) Air side pressure drop (kPa) Air Flow Rate (m3/sec) Single-phase heat transfer coeff. (W/m2 K) Two-phase heat transfer coeff.2 (W/m K) Air side heat transfer coeff (W/m2 K) Single-phase heat transfer coeff. Two-phase heat trasfer coeff Air side heat transfer coeff (W/m2 K) Evaporating Temp at 8.3 C Heat Pump Rating Condition Calc R410A w/ comfort Ideal Counterflow --------- - - - - - - - - - 7.8 Neglected Calc. R744 w/ comfort Ideal Counterflow --------- - - - - - - - - - 7.8 Neglected R410A baseline Three circuit, two slab, A- frame 0.10 1 . 8 8 18.8:1 19 R744 RAC2 0.314 2 . 2 7 7.2:1 8.1 25.9 0.55 0.65 6.68 10.3:1 33 12.8 1.25 Gnielinski Rademacher Hwang 5 Gnielinski 106.7 6 0.8 C 4 Neglected Neglected 63.6 0.57 Ideal Counterflow --------- Ideal Counterflow --------- 0.45 --------- --------- 8.87 10:1 Neglected Neglected Dittus-Boelter 3 0.8 90(Re/Re0.052 m/s) Dittus-Boelter 2500 3 10:1 Neglected Neglected Dittus-Boelter 2 4 19.7:1 28.9 1.26 --------- --------- --------- --------- 1.5 C 8 2500 10,000 0.8 90(Re/Re0.052 m/s) Dittus-Boelter 2 (Transcritical) 90(Re/Re 2.3 C )0.8 90(Re/Re 2.3 C )0.8 0.052 m/s 0.052 m/s 23 Gas Cooler/ Evaporator Outdoor Coil Indoor Coil CondenserPDF Image | Comparison of R744 and R410A
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