A resistance oven employing nichrome wire is to be operated from 220 V single- phase supply and is to be rated at 16kW. If the temperature of the element is to be limited to 1,270 °C and average temperature of the charge is 400 °C, find the diameter and length of the element wire. Radiating efficiency = 0.37, emissivity = 0.8, specific resistance of nichrome (109 10-8) ohm-m.

A resistance oven employing nichrome wire is to be operated from 220 V single- phase supply and is to be rated at 16kW. If the temperature of the element is to be limited to 1,270 °C and average temperature of the charge is 400 °C, find the diameter and length of the element wire. Radiating efficiency = 0.37, emissivity = 0.8, specific resistance of nichrome (109 10-8) ohm-m.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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