Different no. 0.332, 2m/s, 278K, Pr= 0.70, Vis 17.2x106, 1.16 kg/m³, 0.023 W/mK, 323 K, £0.40 per kWh The roof of a sauna loses heat by convection to a flow of air, and the Nusselt number of this flow has been determined to be Nuh = 0.332 (Reh) 0.5 Pr¹/3 The air flows at a velocity of 2 m/s and has a free stream temperature of 278 K. The properties of air are: Prandtl number Pr=0.70, viscosity u-17.2x10-6 Pa-s, density p = 1.16 kg/m³, and thermal conductivity k=0.023 W/mK. The sauna temperature is maintained constant at 323 K using an electric heater at a cost of £0.40 per kWh. The length of the roof in the parallel to the air flow is 2.5 m. a) The average heat transfer coefficient is b) The dimension of the roof perpendicular to the air flow is 6 m, and the roof can be assumed to be the same temperature as the sauna inside. The magnitude (don't include the sign) of the total heat loss from the roof is c) The cost per day of maintaining the temperature of the sauna is £ W/m²K. W.

Different no. 0.332, 2m/s, 278K, Pr= 0.70, Vis 17.2x106, 1.16 kg/m³, 0.023 W/mK, 323 K, £0.40 per kWh The roof of a sauna loses heat by convection to a flow of air, and the Nusselt number of this flow has been determined to be Nuh = 0.332 (Reh) 0.5 Pr¹/3 The air flows at a velocity of 2 m/s and has a free stream temperature of 278 K. The properties of air are: Prandtl number Pr=0.70, viscosity u-17.2x10-6 Pa-s, density p = 1.16 kg/m³, and thermal conductivity k=0.023 W/mK. The sauna temperature is maintained constant at 323 K using an electric heater at a cost of £0.40 per kWh. The length of the roof in the parallel to the air flow is 2.5 m. a) The average heat transfer coefficient is b) The dimension of the roof perpendicular to the air flow is 6 m, and the roof can be assumed to be the same temperature as the sauna inside. The magnitude (don't include the sign) of the total heat loss from the roof is c) The cost per day of maintaining the temperature of the sauna is £ W/m²K. W.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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