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The Dehumidification Handbook, Third Edition

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The Dehumidification Handbook, Third Edition The Dehumidification Handbook Third Edition ISBN 0-9717887-0-7 Copyright 1989, 2002 and 2019 © Munters Corporation The Dehumidification Handbook Third Edition Copyright 1989, 2002 and 2019 © Munters Corporation Reuse Of This Material For book reviews and personal educational and professional use, readers are encouraged to excerpt or photocopy and distribute any useful portion of this handbook, provided that the source of the material is appropriately referenced and the Munters copyright is acknowledged. For electronic distribution or if the material will be included in any printed publication, Munters Corporation must provide written authorization in advance of publication. For those uses, please contact Munters Corporation Marketing Department by mail at 79 Monroe Street, Amesbury, MA 01913, or by email at [email protected]. Disclaimer Although great care has been taken in the compilation and publication of this book, no warranties either expressed or implied are given in connection with the material. Neither the contributors nor the publisher take any responsibility whatsoever for any claims arising from its use. The entire risk of the use of this information is assumed by the user. However, to improve future editions, the publisher welcomes any and all comments, corrections or suggestions from readers. CONTRIBUTORS We would like to express our gratitude to Lew G. Harriman III as editor of the first two editions of this book and for guiding this work with interest. Also, we would like to thank the following original contributors and 1989 Editorial Advisory Board members for their work; Enno Abel, Nick Baranov, Bruce Bonner, Steven Brickley, Luiz Felipe de Carvalho, Douglas Kosar, Hansi Kruger, Ralph Lahmon, Milton Meckler, Mohamed Moledina, Terry Penny, Ing. Eugenio E. Sanchez, Daniel Schroeder, James Staunton, Steven Toth, Kenneth Welter, Sumner Weisman, Roland Wimmerstedt, and Jose Zulueta. In addition, we’d like to acknowledge and give special thanks to Steve Brickley, Jim Judge and Lindsay Judge for their content work and contributions to this (Third) edition of the book. We also extend special thanks to Doug Des Champs for the cover design and book layout of this (Third) edition and T.P.S Inc. for the printing and binding. Munters Corporation TABLE OF CONTENTS 1. INTRODUCTION .................................................................................10 2. PSYCHROMETRICS .............................................................................12 Dry Bulb Temperature Degrees Fahrenheit ..................................................................... 15 Relative humidity - Percent of saturation ........................................................................ 15 Humidity Ratio - Grains of water vapor .......................................................................... 16 Vapor pressure - Inches of mercury ................................................................................. 17 Dew point temperature - Degrees Fahrenheit ................................................................ 18 Enthalpy - Btu’s per pound of air ..................................................................................... 18 Wet-bulb temperature - Degrees Fahrenheit .................................................................. 19 3. METHODS OF DEHUMIDIFICATION ..................................................22 Cooling-based Dehumidification.....................................................................24 Desiccant Dehumidifiers ..................................................................................29 Liquid spray-tower ............................................................................................................32 Solid packed tower ...........................................................................................................34 Rotating horizontal bed ................................................................................................... 36 Multiple vertical bed ........................................................................................................ 38 Rotating Honeycombe® .................................................................................................... 39 Comparing desiccant dehumidifiers ................................................................................ 40 Choosing between desiccant and cooling dehumidifiers................................................ 44 4. APPLICATIONS ...................................................................................46 Corrosion Prevention ......................................................................................48 Military storage ................................................................................................................ 49 Electronics protection .......................................................................................................49 Power plant layup............................................................................................................. 49 Lithium battery production ..............................................................................................49 Condensation Prevention ................................................................................50 Ice rinks .............................................................................................................................51 Water treatment plants ....................................................................................................51 Surface preparation & coating .........................................................................................51 Injection molding ............................................................................................................. 51 4. APPLICATIONS (CONTINUED) ................................................................. 46 Mold/Fungus Prevention .................................................................................52 Archival storage ................................................................................................................53 Seed storage ..................................................................................................................... 53 Cargo protection .............................................................................................................. 53 Breweries .......................................................................................................................... 53 Moisture Regain Prevention ............................................................................54 Candy packaging .............................................................................................................. 55 Semiconductor and pharmaceutical clean rooms ........................................................... 55 Safety glass laminating .....................................................................................................55 Composite manufacturing ............................................................................................... 55 Product Drying ................................................................................................56 Investment castings ..........................................................................................................57 Plastic resin drying ........................................................................................................... 57 Candy coating ...................................................................................................................57 Fish drying ........................................................................................................................ 57 Dry Cooling ......................................................................................................58 Supermarkets ....................................................................................................................59 Hotels and motels .............................................................................................................59 Sick buildings ....................................................................................................................59 Advanced HVAC systems .................................................................................................. 59 5. MOISTURE LOAD CALCULATIONS..................................................... 60 Selecting Design Conditions ...........................................................................62 Moisture Load Sources ....................................................................................64 Periodic vs. continuous loads ........................................................................................... 78 Fresh air moisture load .....................................................................................................78 Sample moisture load calculations ..................................................................81 Warehouse dehumidification ........................................................................................... 82 Glass lamination room ..................................................................................................... 86 6. DESICCANT DEHUMIDIFIER PERFORMANCE .................................... 92 Operating Variables .........................................................................................94 1. Process inlet moisture .................................................................................................
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