Heating, Cooling, Lighting: Sustainable Design Methods for Architects / Edition 3

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Overview

One of the leading references on the design of a building's environmental controls has just gotten better. For years, Heating, Cooling, Lighting has supplied architects and students with the strategies needed for initial design decisions for building systems. The book looks at how to design the form of the building itself to take advantage of natural heating, cooling, and lighting and how to best utilize active mechanical equipment to satisfy the needs not provided by nature. This new edition has been expanded and updated to reflect the latest codes, standards, and energy-efficiency rating systems.

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Editorial Reviews

Booknews
Providing a qualitative, visual approach to heating, cooling, and lighting techniques, this book reflects and supports the decision- making process of architects involved in developing schematic designs. Based on a three-tier approach<-->load avoidance, optimum use of natural energies, and the selection of appropriate mechanical equipment<-->the book seeks to aid designers in providing all of a building's thermal and lighting needs while minimizing energy consumption and maximizing sustainability. It provides information on thermal comfort, mechanical heating and cooling systems, climate, passive heating and cooling, shading, site planning, daylight and artificial lighting, and conservation. Sun path diagrams, sizing tables, case studies, and approximately 1,000 photographs are included. Lechner teaches architecture at Auburn University. Annotation c. Book News, Inc., Portland, OR (booknews.com)
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Product Details

  • ISBN-13: 9780470048092
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 11/24/2008
  • Edition description: New Edition
  • Edition number: 3
  • Pages: 720
  • Sales rank: 214,059
  • Product dimensions: 8.50 (w) x 11.00 (h) x 1.50 (d)

Meet the Author

Norbert Lechner is Professor Emeritus in the College of Architecture, Design, and Construction at Auburn University and was a registered architect in the state of Alabama. His articles have appeared in Architectural Lighting and Solar Today. In addition to writing, he has lectured and held workshops in the United States, Europe, Asia, and the Middle East.

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Read an Excerpt

Note: The Figures and/or Tables mentioned in this sample chapter do not appear on the Web.

HEATING, COOLING, AND LIGHTING AS FORM-GIVERS IN ARCHITECTURE

"Two essential qualities of architecture [commodity and delight], handed down from Vitruvius, can be attained more fully when they are seen as continuous, rather than separated, virtues.

. . . In general, however, this creative melding of qualities [commodity and delight] is most likely to occur when the architect is not preoccupied either with form-making or with problem-solving, but can view the experience of the building as an integrated whole--. . ."

John Morris Dixon



1.1 INTRODUCTION

Until about 100 years ago, the heating, cooling, and lighting of buildings was the domain of architects. Thermal comfort and lighting were achieved with the design of the building and a few appliances. Heating was achieved by a compact design and a fireplace or stove, cooling by opening windows to the wind and shading them from the sun, and lighting by windows, oil lamps, and candles.

By the 1960s, the situation had changed dramatically. It had become widely accepted that the heating, cooling, and lighting of buildings were accomplished mainly by mechanical equipment as designed by engineers.

Our consciousness has been raised as a result of the energy crisis of 1973. It is now recognized that the heating, cooling, and lighting of buildings are best accomplished by both the mechanical equipment and the design of the building itself. Some examples of vernacular and regional architecture will show how architectural design can contribute to the heating, cooling, and lighting of buildings.

1.2 VERNACULAR AND REGIONAL ARCHITECTURE

One of the main reasons for regional differences in architecture is the response to climate. If we look at buildings in hot and humid climates, in hot and dry climates, and in cold climates, we find they are quite different from one another.

In hot and dry climates, one usually finds massive walls used for their time-lag effect. Since the sun is very intense, small windows will adequately light the interiors. The windows are also small because during the daytime the hot outdoor air makes ventilation largely undesirable. The exterior surface colors are usually very light to minimize the absorption of solar radiation. Interior surfaces are also light to help diffuse the sunlight entering through the small windows (Fig. 1.2a).

Since there is usually little rain, roofs can be flat and, consequently, are available as additional living and sleeping areas during summer nights. Outdoor areas cool quickly after the sun sets because of the rapid radiation to the clear night sky. Thus, roofs are more comfortable than the interiors, which are still quite warm from the daytime heat stored in the massive construction.

Even community planning responds to climate. In hot and dry climates, buildings are often closely clustered for the shade they offer one another and the public spaces between them.

In hot and humid climates, we find a very different kind of building. Although temperatures are lower, the high humidity creates great discomfort. The main relief comes from moving air across the skin to increase the rate of evaporative cooling. Although the water vapor in the air weakens the sun, direct solar radiation is still very undesirable. The typical antebellum house (see Fig. 1.2b) responds to the humid climate by its use of many large windows, large overhangs, shutters, light-colored walls, and high ceilings. The large windows maximize ventilation, while the overhangs and shutters protect from both solar radiation and rain. The light-colored walls minimize heat gain.

Since in humid climates nighttime temperatures are not much lower than daytime temperatures, massive construction is not an advantage. Buildings are, therefore, usually made of lightweight wood construction. High ceilings permit larger windows and permit the air to stratify. As a result, people inhabit the lower and cooler air layers. Vertical ventilation through roof monitors or high windows not only increases ventilation but also exhausts the hottest air layers first. For this reason, high gabled roofs without ceilings are popular in many parts of the world that have very humid climates (Fig. 1.2c).

Buildings are sited as far apart as possible for maximum access to the cooling breezes. In some of the humid regions of the Middle East, wind scoops are used to further increase the natural ventilation through the building (Fig. 1.2d).

In mild but very overcast climates, like the Pacific Northwest, buildings open up to capture all the daylight possible. In this kind of climate, the use of "bay" windows is quite common (Fig. 1.2e).

And finally, in a predominantly cold climate we see a very different kind of architecture again. In such a climate, the emphasis is on heat retention. Buildings, like the local animals, tend to be very compact, to minimize the surface-area-to-volume ratio. Windows are few because they are weak points in the thermal envelope. Since the thermal resistance of the walls is very important, wood rather than stone is usually used (Fig. 1.2f). Because hot air rises, ceilings are kept very low (often below 7 feet). Trees and landforms are used to protect against the cold winter winds. In spite of the desire for views and daylight, windows are often sacrificed for the overpowering need to conserve heat.

1.3 FORMAL ARCHITECTURE

Not only vernacular structures but also buildings designed by the most sophisticated architects have responded to the needs for environmental control. After all, the Greek portico is simply a feature to protect against the rain and sun (Fig. 1.3a). The repeating popularity of classical architecture is based not only on aesthetic but also on practical grounds. There is hardly a better way to shade windows, walls, and porches than with large overhangs supported by colonnades or arcades (Fig. 1.3b).

The Roman basilicas consisted of large high-ceilinged spaces that were very comfortable in hot climates during the summer. Clerestory windows were used to bring daylight into these central spaces. Both the trussed roof and groin-vaulted basilicas became prototypes for Christian churches (Fig. 1.3c).

One of the Gothic builders' main goals was to maximize the window area for a large fire-resistant hall. By means of an inspired structural system, they sent an abundance of daylight through stained glass (Fig. 1.3d).

The need for heating, cooling, and lighting has also affected the work of the twentieth-century masters, such as Frank Lloyd Wright. The Marin County Court House emphasizes the importance of shading and daylighting. To give most offices access to daylight, the building consists of linear elements separated by a glass-covered atrium (Figs. 1.3e and 1.3f). The outside windows are shaded from the direct sun by an arcade-like overhang (Fig. 1.3g). Since the arches are not structural, Frank Lloyd Wright shows them hanging from the building.

Le Corbusier also felt strongly that the building should be effective in heating, cooling, and lighting itself. His development of the "brise soleil" will be discussed in some detail later. A feature found in a number of his buildings is the parasol roof, an umbrella-like structure covering the whole building. A good example of this concept is the "Maison d' Homme," which Le Corbusier designed in glass and painted steel (Fig. 1.3h).

Today, with no predominant style guiding architects, revivalism is common. The buildings in Fig. 1.3i use the classical portico for shading. Such historical adaptations can be more climate responsive than the "international style," which often ignores the local climate. Buildings in cold climates can continue to benefit from compactness, and buildings in hot climates still benefit from massive walls and light exterior surfaces. Looking to the past in one's locality will lead to the development of a new and suitable regional style.

1.4 THE ARCHITECTURAL APPROACH

The design of the heating, cooling, and lighting of buildings is accomplished in three tiers (Fig. 1.4). The first tier is the architectural design of the building itself to minimize heat loss in the winter, to minimize heat gain in the summer, and to use light efficiently. Poor decisions at this point can easily double or triple the size of the mechanical equipment and energy eventually needed. The second tier involves the use of natural energies through such methods as passive heating, cooling, and daylighting systems. The proper decisions at this point can greatly reduce the unresolved problems from the first tier. Tiers one and two are both accomplished by the architectural design of the building. Tier three consists of designing the mechanical equipment using mostly nonrenewable energy sources to handle the loads that remain after tiers one and two have reduced the loads as much as possible. Table 1.4 shows the design considerations that are typical at each of these three tiers.

The heating, cooling, and lighting design of buildings always involves all three tiers whether consciously considered or not. Unfortunately, in the recent past, minimal demands were placed on the building itself to affect the indoor environment. It was assumed that it was primarily the engineers at the third tier who were responsible for the environmental control of the building. Thus, architects, who were often indifferent to the heating, cooling, and lighting needs of buildings, sometimes designed buildings that were at odds with their environment. For example, buildings with large glazed areas were designed for very hot or very cold climates. The engineers were then forced to design giant, energy-guzzling heating and cooling plants to maintain thermal comfort. Ironically, these mostly glass buildings had their electric lights on during the day when daylight was abundant because they were not designed for quality daylighting. The size of the mechanical equipment can be seen as an indicator of the architect's success, or lack thereof, in using the building itself to control the indoor environment.

When it is consciously recognized that each of these tiers is an integral part of the heating, cooling, and lighting design process, the buildings are better in several ways. The buildings are often less expensive because of reduced mechanical-equipment and energy needs. Frequently, the buildings are also more comfortable because the mechanical equipment does not have to fight such giant thermal loads. Furthermore, the buildings are often more interesting because some of the money that is normally spent on the mechanical equipment is spent instead on the architectural elements. Unlike hidden mechanical equipment, features, such as shading devices, are a very visible part of the exterior aesthetic.

Proper attention to tiers one and two can easily cut the size of the mechanical equipment by 50 percent, and with extra attention as much as 90 percent. In certain climates, some buildings can even be designed to use no mechanical equipment at all. The Lovins' home/ office, which maintains full comfort high in the Rocky Mountains, has no mechanical equipment at all.

1.5 DYNAMIC VERSUS STATIC BUILDINGS

Contemporary buildings are essentially static with a few dynamic parts, such as the mechanical equipment, doors, and sometimes operable windows. On the other hand, intelligent buildings adapt to their changing environments. This change can occur continuously over a day as, for example, a movable shading device that extends when it is sunny and retracts when it is cloudy. Alternately, the change could be on an annual basis where a shading device is extended during the summer and retracted in the winter, much like a deciduous tree. The dynamic aspect can be modest, as in movable shading devices, or it can be dramatic, as when the whole building rotates to track the sun (Figs. 9.15c to 9.15e). Not only will dynamic buildings perform much better than static buildings, but they also will provide an exciting aesthetic, the aesthetic of change. Numerous examples of dynamic buildings are included throughout the book, but most will be found in the chapters on shading, passive cooling, and daylighting.

1.6 ENERGY AND ARCHITECTURE

The heating, cooling, and lighting of buildings is accomplished by either adding or removing energy. Consequently, this book is about the manipulation and use of energy. In the 1960s, the consumption of energy was considered a trivial concern. For example, buildings were sometimes designed without light switches because it was believed that it was more economical to leave the lights on--continuously. Also, the most popular air-conditioning equipment for larger buildings was the "terminal reheat system," in which the air was first cooled to the lowest level needed by any space, then reheated as necessary to satisfy the other spaces. The double use of energy was not considered an important issue.

Buildings now use about 35 percent of all the energy consumed in the United States (Fig. 1.6). Clearly then, the building industry has a major responsibility in the energy picture of this nation. Architects have both the responsibility and the opportunity to design in an energy-conserving manner.

The responsibility is all the greater because of the effective life of the product. Automobiles last only about ten years, and so any mistakes will not burden society too long. Most buildings, however, have a useful life of at least fifty years. The consequences of design decisions now will be with us for a long time.

Unfortunately, the phrase energy conservation has negative connotations. It makes one think of shortages and discomfort. Yet architecture that conserves energy can be comfortable, sustainable, humane, and aesthetically pleasing. It can also be less expensive than conventional architecture. Operating costs are reduced because of lower energy bills, and first costs are often reduced because of the smaller heating and cooling equipment that is required. To avoid the negative connotations, the more positive and flexible phrases of energy-efficient design or energy-conscious design have been adopted to describe a concern for energy conservation in architecture. Energy-conscious design yields buildings that minimize the needs for expensive, polluting, and nonrenewable energy. Because of the benefit to planet Earth, such design is now frequently called sustainable or green. The importance of energy consciousness is discussed in more detail in the next chapter.

1.7 ARCHITECTURE AND MECHANICAL EQUIPMENT

The following design considerations have impact on both the appearance and the heating, cooling, and lighting of a building: compactness (surface-area- to-volume ratio), size and location of windows, and the nature of the building materials. Thus, when architects start to design the appearance of a building, they simultaneously start the design of the heating, cooling, and lighting. Because of this inseparable relationship between architectural features and the heating, cooling, and lighting of buildings, we can say that the environmental controls are form-givers in architecture.

It is not just tiers one and two that have aesthetic impact. The mechanical equipment required for heating and cooling is often quite bulky, and because it requires access to outside air, it is frequently visible on the exterior. The lighting equipment, although less bulky, is even more visible. Thus, even tier three is interconnected with the architecture, and, as such, must be considered at the earliest stages of the design process.

(The plumbing and electrical wiring systems do not have this same form-giving and integral relationship with architecture. Since these systems are fairly small, compact, and flexible, they are easily buried in the walls and ceilings. Thus, they require little or no attention at the schematic design stage and are not discussed in this book.)

1.8 CONCLUSION

The heating, cooling, and lighting of buildings is accomplished not just by mechanical equipment, but mostly by the design of the building itself. The design decisions that affect these environmental controls have, for the most part, a strong effect on the form and aesthetics of buildings. Thus, through design, architects have the opportunity to simultaneously satisfy their need for aesthetic expression and to efficiently heat, cool, and light buildings. Only through architectural design can buildings be heated, cooled, and lit in an environmentally responsible way. The importance of that is explained in the next chapter on sustainability.

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Table of Contents

Foreword to the First Edition.

Foreword to the Third Edition.

Preface.

Acknowledgments.

1. HEATING, COOLING, AND LIGHTING AS FORM-GIVERS IN ARCHITECTURE.

1.1 Introduction.

1.2 Vernacular and Regional Architecture.

1.3 Formal Architecture.

1.4 The Architectural Approach.

1.5 Dynamic versus Static Buildings.

1.6 Passive Survivability.

1.7 Energy and Architecture.

1.8 Architecture and Heating, Cooling, and Lightning.

1.9 Conclusion.

2. SUSTAINABLE DESIGN.

2.1 Easter Island: Learning from the Past.

2.2 Sustainable Design.

2.3 Reuse, Recycle, and Regenerate by Design.

2.4 The Green Movement.

2.5 Population and Sustainability.

2.6 Growth.

2.7 Exponential Growth.

2.8 The Amoeba Analogy.

2.9 Supply versus Efficiency.

2.10 Sustainable-Design Issues.

2.11 Climate Change.

2.12 The Global Greenhouse.

2.13 The Ozone Hole.

2.14 Efficiency.

2.15 Energy Sources.

2.16 Ancient Greece: A Historical Example.

2.17 Nonrenewable Energy Sources.

2.18 Renewable Energy Sources.

2.19 Hydrogen.

2.20 Conclusion.

3. BASIC PRINCIPLES.

3.1 Introduction.

3.2 Heat.

3.3 Sensible Heat.

3.4 Latent Heat.

3.5 Evaporative Cooling.

3.6 Convection.

3.7 Transport.

3.8 Energy-Transfer Mediums.

3.9 Radiation.

3.10 Greenhouse Effect.

3.11 Equilibrium Temperature of a Surface.

3.12 Mean Radiant Temperature.

3.13 Heat Flow.

3.14 Heat Sink.

3.15 Heat Capacity.

3.16 Thermal Resistance.

3.17 Heat-Flow Coefficient.

3.18 Time Lag.

3.19 Insulating Effect of Mass.

3.20 Energy Conversion.

3.21 Combined Heat and Power.

3.22 Fuel Cells.

3.23 Embodied Energy.

3.24 Conclusion.

4. THERMAL COMFORT.

4.1 Biological Machine.

4.2 Thermal Barriers.

4.3 Metabolic Rate.

4.4 Thermal Conditions of the Environment.

4.5 The Psychometric chart.

4.6 Dew Point and Wet-Bulb Temperatures.

4.7 Heat Content of Air.

4.8 Thermal Comfort.

4.9 Shifting of the Comfort Zone.

4.10 Clothing and Comfort.

4.11 Strategies.

4.12 Conclusion.

5. CLIMATE.

5.1 Introduction.

5.2 Climate.

5.3 Microclimate.

5.4 Climatic Anomalies.

5.5 Climate Regions of the United States.

5.6 Explanations of the Climatic Data Tables.

5.7 Additional Climate Information.

5.8 Climate Information for Other Countries.

Climate Data Tables.

5.9 Design Strategies.

6. SOLAR GEOMETRY.

6.1 Introduction.

6.2 The Sun.

6.3 Elliptical Orbit.

6.4 Tilt of the Earth's Axis.

6.5 Consequences of the Altitude Angle.

6.6 Winter.

6.7 The Sun Revolves Around the Earth!

6.8 Sky Dome.

6.9 Determining Altitude and Azimuth Angles.

6.10 Solar Time.

6.11 Horizontal Sun-Path Diagrams.

6.12 Vertical Sun-Path Diagrams.

6.13 Sun-Path Models.

6.14 Solar Site-Evaluation Tools.

6.15 Heliodons.

6.16 Sundials for Model Testing.

6.17 Conceptually Clear Heliodons.

6.18 Conclusion.

7. PASSIVE SOLAR.

7.1 History.

7.2 Solar in America.

7.3 Solar Hemicycle.

7.4 Latest Rediscovery of Passive Solar.

7.5 Passive Solar.

7.6 Direct-Gain Systems.

7.7 Design Guidelines for Direct-Gain Systems.

7.8 Example.

7.9 Trombe Wall Systems.

7.10 Design Guidelines for Trombe Wall Systems.

7.11 Examples.

7.12 Suspaces.

7.13 Balcomb House.

7.14 Sunspace Design Guidelines.

7.15 Comparison of the Three Main Passive Heating Systems.

7.16 General Considerations for Passive Solar Systems.

7.17 Heat-Storage Materials.

7.18 Other Passive Heating Systems.

7.19 Conclusion.

8. PHOTOVOLTAICS AND ACTIVE SOLAR.

8.1 Introduction.

8.2 The Almost Ideal Energy Source.

8.3 History of PV.

8.4 The PV Cell.

8.5 Types of PV Systems.

8.6 Balance of System Equipment.

8.7 Building-Integrated Photovoltaics.

8.8 Orientation and Tilt.

8.9 Roofs Clad with PV.

8.10 Facades Clad with PV.

8.11 Glazing and PV.

8.12 PV Shading Devices.

8.13 PV: Part of the Second Tier.

8.14 Sizing a PV System.

8.15 Finding the PV Array Size for a Stand-Alone Building by the Short Calculation Method.

8.16 Design Guidelines.

8.17 The Promise of PV.

8.18 The Cost Effectiveness of PV and Active Solar Applications.

8.19 Active Solar Swimming-Pool Heating.

8.20 Solar Hot-Water Systems.

8.21 Solar Hot-Air Collectors.

8.22 Designing an Active Solar System.

8.23 Active/Passive Solar Systems.

8.24 Preheating of Ventilation Air.

8.25 The Future of Active Solar.

8.26 Conclusion.

9. SHADING AND LIGHT COLORS.

9.1 History of Shading.

9.2 Shading.

9.3 Fixed Exterior Shading Devices.

9.4 Movable Shading Devices.

9.5 Shading Periods of the Year.

9.6 Horizontal Overhangs.

9.7 Design of Horizontal Overhangs-Basic Method.

9.8 Shading Design for South Windows.

9.9 Design Guidelines for Fixed South Overhangs.

9.10 Design Guidelines for Movable South Overhangs.

9.11 Shading for East and West Windows.

9.12 Design of East and West Horizontal Overhangs.

9.13 Design of Slanted Vertical Fins.

9.14 Design of Fins on North Windows.

9.15 Design Guidelines for Eggcrate Shading Devices.

9.16 Special Shading Strategies.

9.17 Shading Outdoor Spaces.

9.18 Using Physical Models for Shading Design.

9.19 Glazing as the Shading Element.

9.20 Interior Shading Devices.

9.21 Shading Coefficient and Solar Heat-Gain Coefficient.

9.22 Reflection from Roofs and Walls.

9.23 Conclusion.

10. PASSIVE COOLING.

10.1 Introduction to Cooling.

10.2 Historical and Indigenous Use of Passive Cooling.

10.3 Passive Cooling Systems.

10.4 Comfort Ventilation versus Night-Flush Cooling.

10.5 Basic Principles of Air Flow.

10.6 Air Flow Through Buildings.

10.7 Example of Ventilation Design.

10.8 Comfort Ventilation.

10.9 Night-Flush Cooling.

10.10 Smart Facades and Roofs.

10.11 Radiant Cooling.

10.12 Evaporative Cooling.

10.13 Cool Towers.

10.14 Earth Cooling.

10.15 Dehumidification with a Desiccant.

10.16 Conclusion.

11. SITE DESIGN, COMMUNITY PLANNING, AND LANDSCAPING.

11.1 Introduction.

11.2 Site Selection.

11.3 Solar Access.

11.4 Shadow Patterns.

11.5 Site Planning.

11.6 Solar Zoning.

11.7 Physical Models.

11.8 Wind and Site Design.

11.9 Plants and Vegetation.

11.10 Green Roofs.

11.11 Lawns.

11.12 Landscaping.

11.13 Community Design.

11.14 Cooling Our Communities.

11.15 Conclusion.

12. LIGHTING.

12.1 Introduction.

12.2 Light.

12.3 Reflectance/Transmittance.

12.4 Color.

12.5 Vision.

12.6 Perception.

12.7 Performance of a Visual Task.

12.8 Characteristics of the Visual Task.

12.9 Illumination Level.

12.10 Brightness Ratios.

12.11 Glare.

12.12 Equivalent Spherical Illumination.

12.13 Activity Needs.

12.14 Biological Needs.

12.15 Light and Health.

12.16 The Poetry of Light.

12.17 Rules for Lighting Design.

12.18 Career Possibilities.

12.19 Conclusion.

13. DAYLIGHTING.

13.1 History of Daylighting.

13.2Why Daylighting?

13.3 The Nature of Daylight.

13.4 Conceptual Model.

13.5 Illumination and the Daylight Factor.

13.6 Light without Heat?

13.7 Cool Daylight.

13.8 Goals of Daylighting.

13.9 Basic Daylighting Strategies.

13.10 Basic Windows Strategies.

13.11 Advanced Windows Strategies.

13.12 Window Glazing Materials.

13.13 Top Lighting.

13.14 Skylight Strategies.

13.15 Clerestories, Monitors, and Light Scoops.

13.16 Special Daylighting Techniques.

13.17 Translucent Walls and Roofs.

13.18 Electric Lighting as a Supplement to Daylighting.

13.19 Physical Modeling.

13.20 Guidelines for Daylighting.

13.21 Conclusion.

14. ELECTRIC LIGHTING.

14.1 History of Light Sources.

14.2 Light Sources.

14.3 Incandescent and Halogen Lamps.

14.4 Discharge Lamps.

14.5 Fluorescent Lamps.

14.6 High Intensity Discharge Lamps (Mercury, Metal Halide, and High Pressure Sodium).

14.7 Comparison of the Major Lighting Sources.

14.8 Solid State Lighting.

14.9 Luminaires.

14.10 Lenses, Diffusers, and Baffles.

14.11 Lighting Systems.

14.12 Remote Source Lighting Systems.

14.13 Visualizing Light Distribution.

14.14 Architectural Lighting.

14.15 Outdoor Lighting.

14.16 Emergency Lighting.

14.17 Controls.

14.18 Maintenance.

14.19 Rules for Energy-Efficient Electric Lighting Design.

14.20 Conclusion.

15. THE THERMAL ENVELOPE: KEEPING WARM AND STAYING COOL.

15.1 Background.

15.2 Heat Loss.

15.3 Heat Gain.

15.4 Solar Reflectivity (Albedo).

15.5 Compactness, Exposed Area, and Thermal Planning.

15.6 Insulation Materials.

15.7 The Thermal Envelope.

15.8 Heat Bridges.

15.9 Windows.

15.10 Movable Insulation.

15.11 Insulating Effect from Thermal Mass.

15.12 Earth Sheltering.

15.13 Infiltration and Ventilation.

15.14 Moisture Control.

15.15 Radon.

15.16 Appliances.

15.17 Conclusion.

16. MECHANICAL EQUIPMENT FOR HEATING AND COOLING.

16.1 Introduction.

16.2 Heating.

16.3 Thermal Zones.

16.4 Heating Systems.

16.5 Electric Heating.

16.6 Hot-Water (Hydronic) Heating.

16.7 Hot-Air Systems.

16.8 Cooling.

16.9 Refrigeration Cycles.

16.10 Heat Pumps.

16.11 Geo-Exchange.

16.12 Cooling Systems.

16.13 Air Conditioning for Small Buildings.

16.14 Air Conditioning for Large Multistory Buildings.

16.15 Design Guidelines for Mechanical Systems.

16.16 Air Supply (Ducts and Diffusers).

16.17 Ventilation.

16.18 Energy-Efficient Ventilation Systems.

16.19 Air Filtration and Odor Removal.

16.20 Special Systems.

16.21 Integrated and Exposed Mechanical Equipment.

16.22 Conclusion.

17. CASE STUDIES.

17.1 Introduction.

17.2 The Real Goods Solar Living Center.

17.3 The Urban Villa.

17.4 The Emerald People's Utility District Headquarters.

17.5 Colorado Mountain College.

17.6 Gregory Bateson Building.

17.7 Commerzbank.

17.8 Phoenix Central Library.

Appendix A: Horizontal Sun-Path Diagrams.

Appendix B: Vertical Sun-Path Diagrams.

Appendix C: Solar Altitude and Azimuth Angles.

Appendix D: Methods for Estimating the Height of Trees, Buildings, etc.

Appendix E: Sundials.

Appendix F: Sun-Path Models.

Appendix G: Computer Software Useful for the Schematic Design Stage.

Appendix H: Site Evaluation Tools.

Appendix I: Heliodons.

Appendix J: Educational Opportunities in Energy-Conscious Design.

Appendix K: Resources.

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