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Building Services Engineering 5th Edition Handbook

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viii<br />

Contents<br />

Sewage-lifting pump 235<br />

Testing 236<br />

Questions 236<br />

10 Condensation in buildings 239<br />

Learning objectives 239<br />

Key terms and concepts 239<br />

Introduction 240<br />

Sources of moisture 240<br />

Condensation and mould growth 242<br />

Vapour diffusion 242<br />

Temperature gradient 247<br />

Dew-point temperature gradient 251<br />

Installation note 254<br />

Questions 256<br />

11 Lighting 260<br />

Learning objectives 260<br />

Key terms and concepts 260<br />

Introduction 261<br />

Natural and artificial illumination 261<br />

Definition of terms 264<br />

Maintenance 265<br />

Utilization factor 266<br />

Glare and reflections 267<br />

Lumen design method 267<br />

Air-handling luminaires 269<br />

Colour temperature 269<br />

Lamp types 269<br />

Control of lighting services 273<br />

Questions 273<br />

12 Gas 280<br />

Learning objectives 280<br />

Key terms and concepts 280<br />

Introduction 281<br />

Gas pipe sizing 281<br />

Gas service entry into a building 285<br />

Flue systems for gas appliances 286<br />

Ignition and safety controls 289<br />

Questions 289<br />

13 Electrical installations 291<br />

Learning objectives 291<br />

Key terms and concepts 292<br />

Introduction 292<br />

Electricity distribution 292

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