ASHRAE Book HumidityControlDesignGuide 2001
$115.38
ASHRAE Humidity Control Design Guide for Commercial and Institutional Buildings
| Published By | Publication Date | Number of Pages |
| ASHRAE | 2001 |
Helps technical professionals design humidity control systems for commercial buildings. The over 500-page Guide provides the HVAC designer with complete coverage of humidity control from basic principles to real-world design advice, and is organized in a logical, easy-to-follow layout.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | TOC |
| 19 | Chapter 1 Purpose, Assumptions & Terminology |
| 20 | Introduction Purpose Assumptions Strengths And Limitations Of This Book |
| 21 | Terminology |
| 22 | Corrections & Suggestions, Please |
| 23 | Chapter 2 Humidity Control Basics |
| 24 | Owner’s Role – Define the Purpose of the Project Good definitions of project purpose |
| 25 | Owner and occupant expectations: moderation vs. control |
| 27 | Architectural Designer – A Low-Leakage Building Air infiltration vs. vapor diffusion |
| 29 | Vapor retarders |
| 30 | Avoid thermal bridges |
| 32 | HVAC Designer – Control the Outdoor Air Pretreat the ventilation air |
| 33 | Consider dedicated equipment for dehumidification |
| 34 | Reduce the load Specify tight ductwork |
| 36 | Set cooling economizers at the control dew point |
| 37 | Avoid oversizing DX cooling equipment Eliminate any suction at the exterior wall |
| 40 | Cautions for special humidity requirements |
| 45 | Contractors – Low-Leakage Building & Ductwork Seal the exterior wall Dry all material before applying interior finish Seal all ductwork and its connections |
| 48 | Building Staff – Maintain Air Balance Correcting shortcomings |
| 49 | Maintain make-up air systems |
| 50 | When raising temperatures to save energy, provide continuous dehumidification Tune the cooling systems for dehumidification |
| 54 | References |
| 59 | Chapter 3 Psychrometrics of Humidity Control |
| 60 | Psychrometric Variables Dry bulb temperature |
| 61 | Relative humidity |
| 62 | Humidity ratio Specific humidity Dew point temperature |
| 63 | Wet bulb temperature |
| 64 | Vapor pressure |
| 65 | Enthalpy |
| 66 | Relating Equipment to Air Conditioning Processes |
| 67 | Sensible heating |
| 68 | Sensible cooling |
| 69 | Dehumidification using cooling coils |
| 71 | Dehumidification via active desiccants |
| 73 | Dehumidification via liquid desiccants |
| 74 | Adiabatic humidification |
| 75 | Isothermal humidification |
| 76 | Additional Resources |
| 79 | Chapter 4 Human Comfort and Humidity |
| 80 | Introduction to Basic Variables of Human Comfort The surrounding air The building, its equipment & furnishings The individual |
| 85 | Summarizing the Basics |
| 86 | Quantifying The Relationship Between Comfort and Humidity Thermal sensation Thermal balance |
| 88 | Acceptability Humidity |
| 90 | Low humidity |
| 91 | High humidity Overall thermal acceptability |
| 92 | Perceived air quality |
| 94 | References |
| 97 | Chapter 5 Corrosion & Relative Humidity |
| 98 | Atmospheric Corrosion & Relative Humidity |
| 99 | Rough surfaces attract water vapor Surface particles attract water vapor |
| 100 | Critical relative humidity |
| 102 | Measuring actual corrosion rates References |
| 103 | Chapter 6 Electrostatic Discharge & Relative Humidity |
| 104 | Basics of Electrostatic Discharge Electrostatic charges are created when surfaces separate Charges build up when they cannot flow to ground High humidity helps dissipate charges |
| 105 | Charge Generation & Retention Resistance retains charges |
| 106 | Resistance declines as humidity increases |
| 107 | How charges are generated in commercial buildings |
| 110 | Personal Sensitivity to Electrostatic Shock |
| 112 | Safety Issues |
| 113 | Guidelines For Controlling Electrostatic Discharge With Humidity |
| 114 | References |
| 117 | Chapter 7 Mold & Mildew |
| 118 | Basics of Mold Growth Mold is everywhere Conditions needed for mold growth |
| 119 | Mechanics of mold growth |
| 120 | Controlling humidity to limit fungal growth |
| 121 | Molds Common In Commercial Buildings |
| 122 | Stachybotrys chartarum (formerly Stachybotrys atra) |
| 123 | The Fungus – S. chartarum Mycotoxins produced by S. chartarum |
| 124 | History of problems with S. chartarum |
| 125 | Where S. chartarum occurs indoors |
| 126 | Selected references concerning stachybotrys chartarum |
| 127 | Mold In The Building Envelope & Contents Purple, pink or black stains on wall covering |
| 128 | Mold & mildew above ceilings, on walls and ceiling tiles |
| 130 | Mold in books and carpets |
| 132 | Mold In The HVAC System Mold on filters Mold in and around drain pans |
| 133 | Mold in unitary equipment |
| 134 | Mold in ductwork downstream of cooling coils |
| 135 | Mold downstream of humidifiers |
| 136 | References |
| 139 | Chapter 8 Dust Mites & Insects |
| 140 | Dust Mites & Insects in Buildings How insects obtain & retain water |
| 141 | Dust mites and humidity |
| 143 | Dust mite geography Controlling Dust Mites In Buildings |
| 144 | References |
| 145 | Chapter 9 Bacteria & Viruses |
| 146 | Airborne Infections Humidity levels that minimize airborne infections Viruses |
| 148 | Bacteria |
| 152 | Humidity Influence on Effectiveness of Disinfectants |
| 154 | References |
| 155 | Chapter 10 Design Procedure |
| 156 | Designing For Humidity Control Five-Step Design Process Step 1 – Defining the purpose of the project |
| 157 | Step 2 – Setting moisture control levels and tolerances |
| 158 | Step 3 – Calculating peak moisture loads |
| 160 | Step 4 – Selecting, sizing and placing equipment |
| 161 | Step 5 – Selecting and placing sensors and controls |
| 163 | Integrating Humidity Control into Typical Commercial HVAC Systems |
| 164 | Systems based on central station air handlers |
| 169 | Systems based on packaged rooftop units |
| 174 | Systems that use room units |
| 177 | References |
| 179 | Chapter 11 Estimating Dehumidification Loads |
| 180 | Dehumidification Moisture Loads Step 1 – Select Design Conditions |
| 181 | Step 2 – Define The Building and Occupants |
| 182 | Step 3 – Estimate The Dehumidification Loads |
| 183 | People |
| 184 | Ventilation |
| 186 | Infiltration |
| 188 | Doors |
| 190 | Moist materials & products |
| 191 | Wet surfaces |
| 193 | Vapor permeance |
| 195 | Domestic loads |
| 196 | Comparing Loads By Climate and Application |
| 202 | References |
| 203 | Chapter 12 Estimating Humidification Loads |
| 204 | Sizing Humidifiers Narrow-range control & humidity above 35% rh Humidification Loads Ventilation |
| 205 | Infiltration |
| 206 | Loads vs. Equipment Size |
| 207 | Air-Side Economizers |
| 208 | Cautions concerning air sideeconomizers |
| 209 | References |
| 211 | Chapter 13 Dehumidifiers |
| 212 | Dehumidification Designing Dehumidification Systems |
| 214 | Mechanical vs. Desiccant Dehumidifiers Mechanical Dehumidifiers |
| 215 | Performance of mechanical dehumidifiers |
| 216 | Components of mechanical dehumidifiers |
| 219 | Capacity modulation |
| 220 | System design suggestions & field experience |
| 221 | Commissioning mechanical dehumidification systems |
| 222 | Active Desiccant Dehumidifiers Performance of desiccant dehumidifiers |
| 223 | Process air temperature rise |
| 224 | Post-cooling |
| 225 | Controlling desiccant dehumidifiers |
| 227 | System design suggestions & field experience |
| 229 | Commissioning desiccant systems |
| 230 | Liquid desiccant systems |
| 231 | References |
| 233 | Chapter 14 Humidifiers |
| 234 | Humidification Adiabatic vs. Isothermal Humidifiers |
| 235 | Isothermal Humidification Systems |
| 236 | Steam boilers Steam-heated, secondary steam boilers |
| 237 | Heated-vapor generators |
| 240 | Introducing heated vapor to an air stream |
| 241 | Duct steam dispersers |
| 244 | Design suggestions for steam humidification |
| 247 | Adiabatic Humidification Systems Wetted media Atomizers and foggers |
| 249 | Introducing cold mist into an air stream |
| 250 | References |
| 251 | Chapter 15 Load Reduction Equipment |
| 252 | Load Reduction Equipment Passive Desiccant Wheels |
| 253 | Moisture transfer performance |
| 254 | Hardware variations |
| 255 | Typical design features |
| 256 | Suggestions for system design |
| 257 | Heat Pipes |
| 258 | Heat pipe performance |
| 259 | Hardware variations Suggestions for system design |
| 260 | Plate-Type Heat Exchangers Heat transfer performance |
| 261 | Suggestions for system design |
| 263 | Chapter 16 Building Pressure Management |
| 264 | Commercial Buildings Leak Water and Air How Much Air Leakage? Exterior envelope |
| 265 | Duct connections & equipment casings |
| 267 | Indoor & outdoor air pressures are not uniform Leakage Mechanisms In Tall vs. Low-rise Buildings |
| 268 | Tall building leakage is dominated by the stack effect |
| 269 | Low-rise leakage is dominated by duct & equipment joints |
| 270 | Cold vs. Hot Weather Cold climates |
| 271 | Hot and humid climates Mixed climates |
| 272 | Locating & Measuring Air Leaks |
| 273 | Exterior walls |
| 274 | Duct connections |
| 275 | Whole buildings |
| 277 | Summary References |
| 279 | Chapter 17 Humidity Sensors & Controls |
| 280 | Measuring Humidity Successful control requires more than just a sensor |
| 281 | Which Variable To Control—Dew Point or RH? |
| 282 | Relative Humidity Sensors Bulk resistance sensors |
| 283 | Capacitance relative humidity sensors |
| 284 | Dew Point Sensors – Chilled-Mirror Principle |
| 285 | Aluminum oxide dew point sensor |
| 286 | Psychrometers |
| 287 | Wiring & Calibration Calibration |
| 288 | Locating Humidity Sensors |
| 291 | Humidity Control & Building Automation |
| 292 | References |
| 293 | Chapter 18 Schools |
| 294 | Humidity Control In Schools Classrooms Typical control levels & tolerances Principal loads in classrooms |
| 295 | Suggestions & cautions for classrooms |
| 297 | School Libraries Typical control levels & tolerances |
| 298 | Principal loads in libraries Suggestions & cautions for libraries |
| 299 | Gymnasiums With Maple Floors Typical control levels and tolerances Principal loads in gymnasiums Suggestions & cautions for gymnasiums |
| 300 | Showers & Locker Rooms Typical control levels and tolerances Principal loads in locker rooms |
| 301 | Suggestions & cautions for locker rooms Swimming Pools |
| 302 | References |
| 303 | Chapter 19 Office Buildings |
| 304 | Humidity Control in Office Buildings Typical purposes of humidity control Control levels & tolerances |
| 306 | Principal Loads |
| 308 | Suggestions & Cautions for Offices |
| 312 | References References to help estimate heat loads from officeequipment |
| 313 | Chapter 20 Retail Buildings |
| 314 | Retail Buildings Supermarkets Purpose of humidity control in supermarkets |
| 315 | Typical control levels in supermarkets |
| 316 | Principal moisture loads in supermarkets |
| 317 | Suggestions & cautions for supermarkets |
| 320 | References for supermarkets |
| 322 | General Retail Purpose of humidity control in general retail |
| 323 | Typical control level and tolerance in general retail |
| 324 | Principal loads for general retail stores |
| 325 | Suggestions & cautions for general retail To simply moderate humidity: |
| 328 | To control humidity within a defined range: |
| 330 | References for general retail |
| 331 | Chapter 21 Hotels |
| 332 | Hotels Purpose Of Humidity Control |
| 333 | Control Levels |
| 334 | Avoid vinyl wall covering on exterior walls |
| 335 | Moisture Loads |
| 337 | Suggestions & Cautions |
| 341 | References |
| 343 | Chapter 22 Restaurants |
| 344 | Restaurants Purpose Of Humidity Control |
| 345 | Control Levels & Tolerances Moisture Loads |
| 347 | Suggestions & Cautions |
| 350 | References |
| 351 | Chapter 23 Museums , Libraries & Archives |
| 352 | Humidity Control In Museums, Libraries & Archives Typical Purposes Of Humidity Control |
| 353 | Control Levels & Tolerances |
| 355 | Moisture Loads |
| 358 | Humidity Effects On Artifacts & Documents |
| 359 | Mechanisms of environmental damage to collections |
| 361 | Paper |
| 362 | Natural history specimens Herbarium collections (Dried plants) Metals Film and photographs |
| 364 | Suggestions & Cautions For Humidity Control Project design |
| 366 | Suggestions and cautions for system functions & components |
| 369 | Suggestions and cautions by type of system |
| 371 | Suggestions and cautions regarding energy costs |
| 373 | References For Humidity Effects On Artifacts & Documents |
| 375 | Suggested Reading |
| 377 | Chapter 24 Hospitals |
| 378 | Hospitals Purpose of Humidity Control Control Levels & Tolerances |
| 379 | Control level in cold climates Control level in ductwork & air handling equipment |
| 380 | Control levels to assure comfort for both staff and patients |
| 381 | Operating rooms |
| 382 | Moisture Loads General ventilation |
| 383 | Surgical suite ventilation People and door activity |
| 384 | Infiltration Permeance Humidification loads Suggestions & Cautions |
| 388 | References |
| 389 | Chapter 25 Eldercare |
| 390 | Eldercare Purpose of Humidity Control Control Levels and Tolerances Summer comfort |
| 391 | Winter comfort Control level in ductwork & air handling equipment |
| 392 | Moisture Loads |
| 394 | Suggestions & Cautions |
| 396 | References |
| 399 | Chapter 26 Dormitories |
| 400 | Dormitories Purpose of Humidity Control Control Levels and Tolerances |
| 402 | Moisture Loads |
| 404 | Suggestions & Cautions |
| 407 | Chapter 27 Swimming Pools |
| 408 | Swimming Pools Purpose of Humidity Control |
| 409 | Control Levels and Tolerances |
| 412 | Moisture Loads |
| 414 | Suggestions & Cautions Architectural detailing |
| 416 | Air distribution |
| 418 | References |
| 419 | Chapter 28 Ice Arenas |
| 420 | Ice Arenas Purposes of Humidity Control |
| 421 | Control Levels and Tolerances |
| 422 | Moisture Loads |
| 425 | Suggestions & Cautions Architectural design |
| 427 | Air distribution HVAC components & controls |
| 430 | References |
| 433 | Chapter 29 Dry Air Storage |
| 434 | Dry Air Storage Purpose of Humidity Control |
| 436 | Control Levels and Tolerances |
| 437 | Moisture Loads |
| 438 | Suggestions & Cautions |
| 442 | References |
| 443 | Chapter 30 Laboratories |
| 444 | Laboratories Purposes of Humidity Control & Control Levels |
| 445 | Moisture Loads |
| 448 | Suggestions & Cautions Architectural considerations |
| 450 | HVAC considerations |
| 452 | References Animals |
| 453 | Commissioning & installation case histories |
| 455 | Chapter 31 Weather Data For Design |
| 456 | Engineering Weather Data For Humidity Control 0.4%, 1%, 2%, 99%, 99.6%, – What the percentages mean |
| 457 | Design for dehumidification vs. design for cooling Failures caused by oversizing equipment |
| 458 | The Weather Data Tables Humidification design |
| 459 | Location description Dehumidification design |
| 460 | References Weather data for design load calculations Hourly weather data for system simulation |
| 503 | Chapter 32 ReferenceMaterial |
| 509 | Book Production Notes |
