An array of electrical heating elements is used in an air-duct heater as shown in Fig. P7130. Each element has
An array of electrical heating elements is used in an air-duct heater as shown in Fig. P7–130. Each element has a length of 250 mm and a uniform surface temperature of 350°C. Atmospheric air enters the heater with a velocity of 12 m/s and a temperature of 25°C. Determine the total heat transfer rate and the temperature of the air leaving the heater. Neglect the change in air properties as a result of temperature change across the heater. Evaluate the air properties at an assumed mean temperature of 35°C and 1 atm. Is this a good assumption?
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