The failure of brass plumbing fitting should be explained. Concept Introduction: Electrochemical corrosion takes place when metal atoms become ions by losing electrons. Electrochemical corrosion takes place in an aqueous solution where ions are present in water. The process in which the electrochemical corrosion creates an electric circuit is known as an electrochemical cell. An electrochemical cell is able to generate energy from a chemical reaction or uses energy to produce a chemical reaction. Dezincification is a time-dependent failure caused due to dealloying of the brass over a period of time.

Question

A 4-m × 5-m × 6-m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 5 to 25°C within 10 min. Assuming no heat losses from the room and an atmospheric pressure of 100 kPa, determine the required power of the resistance heater. Assume constant specific heats at room temperature. The properties of air are R = 0.287 kJ/kg·K and cv = 0.718 kJ/kg·K (Table A-2a). The required power of the resistance heater is kW.

Answer 1

Question

Chapter 18, Problem 18.4P

Interpretation Introduction

Interpretation:

The failure of brass plumbing fitting should be explained.

Concept Introduction:

Electrochemical corrosion takes place when metal atoms become ions by losing electrons.

Electrochemical corrosion takes place in an aqueous solution where ions are present in water.

The process in which the electrochemical corrosion creates an electric circuit is known as an electrochemical cell.

An electrochemical cell is able to generate energy from a chemical reaction or uses energy to produce a chemical reaction.

Dezincification is a time-dependent failure caused due to dealloying of the brass over a period of time.

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A 4-m × 5-m × 6-m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 5 to 25°C within 10 min. Assuming no heat losses from the room and an atmospheric pressure of 100 kPa, determine the required power of the resistance heater. Assume constant specific heats at room temperature. The properties of air are R = 0.287 kJ/kg·K and cv = 0.718 kJ/kg·K (Table A-2a). The required power of the resistance heater is kW.

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