A 10-kW heater using Nichrome wire is to be designed. The surface of the Nichrome is to be limited to a maximum temperature of 1650 K. Other design criteria for the heater are minimum convective...

A 10-kW heater using Nichrome wire is to be designed. The surface of the Nichrome is to be limited to a maximum temperature of 1650 K. Other design criteria for the heater are

minimum convective heat-transfer coefficient: 850 W/m²
K minimum temperature of the surrounding medium (air): 370 K The resistivity of Nichrome is 110-cm and the power to the heater is available at 12 V.

a. What size wire is required if the heater is to be in one piece 0.6 m long?

b. What length of 14-gage wire is necessary to satisfy these design criteria?

c. How will the answers to parts (a) and (b) change if h
 1150 W/m²
K?