Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 THE EFFECT OF WIND VELOCITY DISTRIBUTION ON UNGLAZED TRANSPIRED COLLECTORS Convective heat transfer coefficients (CHTC) on vertical façades π π Wind effects on UTC π = πΌ 1 + Ο΅ - 3327 - β +β Ο΅ ππ π Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 π π π Ο΅= π π βπ βπ Ο΅ π = 1 β 1 + π π πππ₯ 1.733π π , 0.02136 × 1 β 1 + 0.2273π π × ππ₯π β0.01895 π 20.62 π‘ β π· π π π· - 3328 - Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 13.5 cm 2 cm ο· DESCRIPTOR ο· 0.5 1 1 1 1 DIRECTION RELATIVE TO THE UTC 1 1 1 CARDINAL DIRECTION 0.5 13.5 13.0 12.5 12.0 11.5 2 8 - 3329 - Indicates height above ground Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 π Local velocity distribution near the UTC area π Convective heat transfer coefficient (CHTC) β π π π π π π π β = 5.90π + 3.95 β = 6.42π + 3.17 β = 7.42π + 2.98 π π South-West Wind South-West Wind South Wind South Wind North-West Wind North-West Wind - 3330 - Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 %πΈππππ = (ππππ’π πππ ππ π π’πππ πππ π‘ππππ’π‘πππ βππππ’π πππ πππ‘π’ππ πππ π‘ππππ’π‘πππ) × 100 ππππ’π πππ πππ‘π’ππ πππ π‘ππππ’π‘πππ UTC thermal efficiency π π DESCRIPTOR CASE 1: WITH PROXIMITY MODEL 1 m/s 3 m/s CASE 2: WITHOUT PROXIMITY MODEL 1 m/s 3 m/s DESCRIPTOR CASE 1: WITH PROXIMITY MODEL 1 m/s - 3331 - 3 m/s CASE 2: WITHOUT PROXIMITY MODEL 1 m/s 3 m/s Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 Comparison of wind tunnel and solar simulator results (Bambara, 2012) π π π π Convective heat transfer coefficient 2 hc (W/m /K) Convective heat transfer coefficient 2 hc (W/m /K) translate to about 160 W.hr/m2 of heat loss through convection. Reference wind velocity Reference wind velocity (m/s) Thermal efficiency Ξ· (%) Wind Tunnel (1 m/s) Solar Simulator (1 m/s) Wind Tunnel (3 m/s) Solar Simulator (3 m/s) 2 Air suction rate (kg/hr/m ) - 3332 - (m/s) Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 cp π π π ππ· π π = ππ π π = π π = ππ π π π = ππ ππ β° β° β° π - 3333 - Proceedings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 Ο΅ - 3334 -
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