# A 40-cm-long, 800-W electric resistance heating element with diameter 0.5 cm and surface temperature 120C is immersed in 75 kg

## Question:

A 40-cm-long, 800-W electric resistance heating element with diameter 0.5 cm and surface temperature 120°C is immersed in 75 kg of water initially at 20°C. Determine how long it will take for this heater to raise the water temperature to 80°C. Also, determine the convection heat transfer coefficients at the beginning and at the end of the heating process.

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**Related Book For**

## Fundamentals of Thermal-Fluid Sciences

**ISBN:** 978-0078027680

5th edition

**Authors:** Yunus A. Cengel, Robert H. Turner, John M. Cimbala

**Question Details**

Chapter #

**16**Section: Problems

Problem: 79

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