Humidity Control Principles and Practice
|
|
|
- Scarlett Neal
- 7 years ago
- Views:
Transcription
1 Humidity Control Principles and Practice Including Advice From A Famous Bank Robber Distinguished Lecture Lew Harriman Mason-Grant Consulting Portsmouth, NH MasonGrant.com 1
2 Outline 2
3 Outline 1. Examples of common humidity control problems 2
4 Outline 1. Examples of common humidity control problems 2. Principles of humidity control 2
5 Outline 1. Examples of common humidity control problems 2. Principles of humidity control 3. 5-Step design process for humidity control 2
6 Outline 1. Examples of common humidity control problems 2. Principles of humidity control 3. 5-Step design process for humidity control 4. Summary 2
7 Who do you work for? HVAC Design consulting firm Architectural design firm Design-build or Energy Service company Contracting or HVAC service company Facility manager/building operator Utility: Power or gas company 3
8 Great Clinic building, great HVAC system... So why did it grow mold 3 times in five years? Indoor dew point = 12.0 C (54 F) - Excellent! 4
9 Great Clinic building, great HVAC system... So why did it grow mold 3 times in five years? Indoor dew point = 12.0 C (54 F) - Excellent! 4
10 Great Clinic building, great HVAC system... So why did it grow mold 3 times in five years? Indoor dew point = 12.0 C (54 F) - Excellent! 4
11 Great Clinic building, great HVAC system... So why did it grow mold 3 times in five years? Indoor dew point = 12.0 C (54 F) - Excellent! 4
12 School - Plenty of system capacity!... Why mold? 5
13 New training building and new HVAC equipment... Why mold and equipment failures? 6
14 Fundamental Principles of Humidity Control Humidity control costs money. Define the PURPOSE for humidity control before you begin any project. Dehumidification performance of equipment must equal or exceed the building s humidity loads. Therefore... Quantify all humidity loads and... Quantify dehumidification performance 7
15 Quick refresher... Psychrometrics for humidity control 75 F 50% RH 8
16 50% RH - Half of the maximum amount at 75 F A relative measurement it depends on temperature 75 F 50% RH 9
17 Humidity ratio - absolute humidity 75 F 50% RH 65 gr/lb 10
18 Dew point: The temperature at which moisture begins to condense out of the air (also absolute ) 75 F 50% RH 65 gr/lb 55 F 11
19 Dew point: The temperature at which moisture begins to condense out of the air (also absolute ) 75 F 50% RH 65 gr/lb 55 F 11
20 Example: Predicting condensation risk on cold supply air diffusers 78 F 65% RH 12
21 Example: Predicting condensation risk on cold supply air diffusers 78 F 65% RH 78 F 12
22 Example: Predicting condensation risk on cold supply air diffusers 78 F 65% RH 78 F 12
23 Example: Predicting condensation risk on cold supply air diffusers 78 F 65% RH 65% RH 78 F 12
24 Example: Predicting condensation risk on cold supply air diffusers 78 F 65% RH 65% RH 78 F 12
25 Example: Predicting condensation risk on cold supply air diffusers 78 F 65% RH 65% RH 78 F 12
26 Example: Predicting condensation risk on cold supply air diffusers 78 F 65% RH 65 65% RH Dew Point 78 F 12
27 Exercise: Predicting condensation from humid air infiltration into air conditioned buildings 13
28 Exercise: Predicting condensation from humid air infiltration into air conditioned buildings In Chicago, summertime outdoor air being sucked into the building cavities is 84 F, 134 gr/lb. 13
29 Exercise: Predicting condensation from humid air infiltration into air conditioned buildings In Chicago, summertime outdoor air being sucked into the building cavities is 84 F, 134 gr/lb. How cold does an indoor wall surface have to be to produce condensation? 13
30 Exercise: Predicting condensation from humid air infiltration into air conditioned buildings In Chicago, summertime outdoor air being sucked into the building cavities is 84 F, 134 gr/lb. How cold does an indoor wall surface have to be to produce condensation? In other words - What is the dew point of air at 84 F, 134 gr/lb =? ) 13
31 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb 14
32 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb 78 F 14
33 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb 78 F 14
34 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb 134 gr/lb 78 F 14
35 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb 134 gr/lb 78 F 14
36 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb 134 gr/lb 78 F 14
37 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb 134 gr/lb 78 F 14
38 Predicting condensation risk inside interior walls and above ceilings 84 F 134 gr/lb gr/lb Dew Point 78 F 14
39 Designing for humidity control - 5-part sequence 15
40 Designing for humidity control - 5-part sequence 15
41 Defining the purpose of the project Why insist the client define the purpose? If client has no problem... no reason to spend money on humidity control. If consequences are not defined impossible to say what that budget must be and impossible to make rational decisions on the owner s behalf. A good project purpose definition includes what... Results are expected Happens when the results are NOT achieved Shortcoming is acceptable 16
42 Poor project definition Control the humidity within the usual limits for a hotel Does not define what the system must accomplish... Human comfort? Control everywhere? or just in the pool area? Both high and low limits? Always? Usually? Only when rooms are occupied? 17
43 Good definition of project purpose Control the humidity in the hotel so that... Neither condensation nor high rh can occur in building cavities that would allow mold growth or other moisture damage to the building or its furnishings. Guest rooms, meeting rooms, dining rooms and offices are held within the ASHRAE comfort zones during both summer and winter seasons The system achieves these goals during all but 2% of the hours in a typical year. 18
44 Step 2 - Establish control level that achieves purpose for humidity control 55 F Dew Point 19
45 Step 2 - Establish control level that achieves purpose for humidity control 55 F Dew Point 19
46 Step 3 - Calculate the humidity loads 20
47 Step 3 - Calculate the humidity loads 20
48 Step 3 - Calculate the humidity loads 20
49 Step 3 - Calculate the humidity loads 20
50 Step 3 - Calculate the humidity loads 20
51 Step 3 - Calculate the humidity loads 20
52 Step 3 - Calculate the humidity loads 20
53 Largest loads? Ventilation/makeup air and infiltration 21
54 Largest loads? Ventilation/makeup air and infiltration 21
55 Retail building in Chicago - Humidity load estimate 22
56 Retail building in Chicago - Humidity load estimate 22
57 Retail building in Chicago - Humidity load estimate Ventilation to dilute contaminants from people 22
58 Retail building in Chicago - Humidity load estimate Ventilation to dilute contaminants from people Ventilation to dilute contaminants from products and furnishings 22
59 Retail building in Chicago - Humidity load estimate Ventilation to dilute contaminants from people Ventilation to dilute contaminants from products and furnishings Air leakage into a tight building 22
60 Peak humidity loads - ASHRAE Research 1997 Correcting 100 years of error - Now we know better 23
61 Peak humidity loads - ASHRAE Research 1997 Correcting 100 years of error - Now we know better 23
62 How to find the peak design dew point? ASHRAE Fundamentals or later 24
63 How to find the peak design dew point? ASHRAE Fundamentals or later...for Cooling load calculations 24
64 How to find the peak design dew point? ASHRAE Fundamentals or later...for dehumidification load calculations, and DOAS system design...for Cooling load calculations 24
65 Chicago - ASHRAE peak humidity design conditions 25
66 Chicago - ASHRAE peak humidity design conditions 0.4% Dry Bulb 92 DB 74.6 MCWB 101 gr/lb 25
67 Chicago - ASHRAE peak humidity design conditions 0.4% Dry Bulb 0.4% Dew Point 92 DB 74.6 MCWB 84 DB 77.7 MCWB 101 gr/lb 134 gr/lb 25
68 Chicago - ASHRAE peak humidity design conditions 0.4% Dry Bulb 0.4% Dew Point Difference at peak dew point 92 DB 74.6 MCWB 84 DB 77.7 MCWB -8 F DB 101 gr/lb 134 gr/lb +33 gr/lb 25
69 Chicago load at peak dry bulb vs. peak dew point 26
70 Chicago load at peak dry bulb vs. peak dew point 26
71 Chicago load at peak dry bulb vs. peak dew point 26
72 Chicago load at peak dry bulb vs. peak dew point 65 lb/h at peak Dry Bulb 26
73 Chicago load at peak dry bulb vs. peak dew point 65 lb/h at peak Dry Bulb 110 lb/h at peak Dew Point 26
74 Step 4 - Size and select the dehumidifier 27
75 Step 4 - Size and select the dehumidifier Cool-Reheat Dehumidifier 27
76 Step 4 - Size and select the dehumidifier Cool-Reheat Dehumidifier Desiccant Dehumidifier 27
77 Cool-Reheat Dehumidifier 28
78 Desiccant Dehumidifier 29
79 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
80 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
81 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
82 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
83 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
84 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
85 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
86 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
87 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
88 Measuring Dehumidification How to measure? Humidity ratios (gr/lb or g/kg) before and after the dehumidifier 30
89 Finding the humidity ratio from temperature and RH 75 F 50% RH 31
90 Finding the humidity ratio from temperature and RH 75 F 50% RH 75 F 31
91 Finding the humidity ratio from temperature and RH 75 F 50% RH 75 F 31
92 Finding the humidity ratio from temperature and RH 75 F 50% RH 50% RH 75 F 31
93 Finding the humidity ratio from temperature and RH 75 F 50% RH 50% RH 75 F 31
94 Finding the humidity ratio from temperature and RH 75 F 50% RH 50% RH 65 gr/lb 75 F 31
95 Dehumidification equation Where:! lbs/h = Pounds of water vapor per hour! CFM = Standard cubic ft/min! gr/lb 1 = Higher humidity ratio! gr/lb 2 = Lower humidity ratio! 7000 = grains of water vapor in a pound! 32
96 Where to locate the DH in the system? 33
97 Where to locate the DH in the system? 33
98 Where to locate the DH in the system? 33
99 Where to locate the DH in the system? 33
100 Where to locate the DH in the system? 33
101 Need expert advice?... consult an expert! 34
102 Need expert advice?... consult an expert! 34
103 Need expert advice?... consult an expert! Reporter: Willie, it s a Federal Crime! why rob BANKS? 34
104 Need expert advice?... consult an expert! Reporter: Willie, it s a Federal Crime! why rob BANKS? 34
105 Willie might ask you... where s the humidity load? 35
106 Willie might ask you... where s the humidity load? 35
107 Willie might ask you... where s the humidity load? 35
108 Willie might ask you... where s the humidity load? 35
109 Dry where the load is - DOAS controls humidity 36
110 Typical layout - Big box retail 37
111 Add return air connection for humidity control during unoccupied hours and vacations 38
112 Summary - Humidity Control Principles and Practice 39
113 Summary - Humidity Control Principles and Practice First and most important step: Define the purpose for humidity control 39
114 Summary - Humidity Control Principles and Practice First and most important step: Define the purpose for humidity control To control humidity: 39
115 Summary - Humidity Control Principles and Practice First and most important step: Define the purpose for humidity control To control humidity: Quantify humidity loads and 39
116 Summary - Humidity Control Principles and Practice First and most important step: Define the purpose for humidity control To control humidity: Quantify humidity loads and Quantify DH equipment performance 39
117 Summary - Humidity Control Principles and Practice First and most important step: Define the purpose for humidity control To control humidity: Quantify humidity loads and Quantify DH equipment performance Biggest humidity load?... Ventilation and makeup air, BY FAR the largest loads 39
118 Summary - Humidity Control Principles and Practice First and most important step: Define the purpose for humidity control To control humidity: Quantify humidity loads and Quantify DH equipment performance Biggest humidity load?... Ventilation and makeup air, BY FAR the largest loads For easy humidity control - Dry the incoming air in a dedicated outdoor air system (DOAS) 39
119 Further ASHRAE Resources Humidity Control Design Guide Guide for Buildings in Hot and Humid Climates ASHRAE Handbook (Applications) Lew Harriman Chair, ASHRAE TC 1.12 (603)
Whole House Dehumidification for Occupant Comfort and Energy Savings
Downloaded from www.rsrews.com. Since 1968, RS Andrews has proudly served Atlanta's Heating, Air Conditioning & Plumbing Needs. Whole House Dehumidification for Occupant Comfort Energy Savings June 2009
Moisture Control. It s The Dew Point. Stupid! Its not the humidity.
Moisture Control Its not the humidity. It s The Dew Point Stupid! Mike Schell EpiphanyTec Inc. Santa Barbara, CA mschell@epiphanytec.com 805 687-3175 Matching great technology to market need! Topics SHR
APPLICATION GUIDE. Comparison of Latent Cooling Performance of Various HVAC systems in a Classroom Application
APPLICATION GUIDE Comparison of Latent Cooling Performance of Various HVAC systems in a Classroom Application Section Comparison of Latent Cooling Performance of Introduction Most commercial HVAC systems
APPLICATION GUIDE. Moisture Management in Waterborne Climate Systems
APPLICATION GUIDE Moisture Management in Waterborne Climate Systems Contents Introduction 3 WBCS Concept 3 Condensation 4 Moisture Sources in the Space 4 Impact of a High Moisture Load 5 Designing to Manage
Molds and mildew are fungi that grow
Appendix C: Moisture, Mold and Mildew Molds and mildew are fungi that grow on the surfaces of objects, within pores, and in deteriorated materials. They can cause discoloration and odor problems, deteriorate
Hospital Application Guide. Cost-effective climate control for hospitals
Hospital Application Guide Cost-effective climate control for hospitals Munters is the world leader in dehumidification Munters is the largest manufacturer of dehumidifiers in the world. Since developing
Answers to Your Questions from the Webinar
2008 Desert Aire and USA Swimming. Used by permission. Desert Aire & USA Swimming - Aquatics Webinar - Answers to Your Questions Answers to Your Questions from the Webinar Thank you for your interest in
Humid Air. Water vapor in air. Trace Glasses 1% Argon (A) Water vapor (H 2
Humid Air Water vapor in air Oxygen 21% Trace Glasses 1% Argon (A) Water vapor (H 2 O) Carbon dioxide (CO 2 ) Neon (Ne) Helium (He) Krypton (Kr) Hydrogen (H) Ozone (O 3 ) Nitrogen 78% Humid Air Water vapor
Dedicated Outdoor Air Systems (D.O.A.S.)
Commercial and Industrial Climate Control Systems Dedicated Outdoor Air Systems (D.O.A.S.) AMDOAS-1 What is it? Why use one? What are my options? Selection considerations Design steps What is it? A separate
LIQUID DESICCANT AIR CONDITIONING Saves energy, Controls humidity, Cleans air
LIQUID DESICCANT AIR CONDITIONING Saves energy, Controls humidity, Cleans air 0 Optimal Air Quality: Critical to Hotels Provides comfortable environment for guests no overcooling Protects building, carpets
Venice Library Humidity Study. for Williams Building Diagnostics, LLC 305 15 th Street West Bradenton, FL 34205. Report April 13, 2015
for Williams Building Diagnostics, LLC 305 15 th Street West Bradenton, FL 34205 Report April 13, 2015 Moses & Associates, Inc. 2209 NW 40 th Terrace, Suite A Gainesville, FL 32605 FL License EB-0003097
Components HVAC General Standards HVAC Guidelines HVAC System Selection Life Cycle Cost Analysis
Components HVAC General System Selection Life Cycle Cost Analysis Outdoor Air Design Values Indoor Air Design Values Outdoor Air Ventilation Welding Ventilation Temperature Control Systems Ductwork HVAC
How do I measure the amount of water vapor in the air?
How do I measure the amount of water vapor in the air? Materials 2 Centigrade Thermometers Gauze Fan Rubber Band Tape Overview Water vapor is a very important gas in the atmosphere and can influence many
Air Water Vapor Mixtures: Psychrometrics. Leon R. Glicksman c 1996, 2010
Air Water Vapor Mixtures: Psychrometrics Leon R. Glicksman c 1996, 2010 Introduction To establish proper comfort conditions within a building space, the designer must consider the air temperature and the
CHAPTER 3. BUILDING THERMAL LOAD ESTIMATION
CHAPTER 3. BUILDING THERMAL LOAD ESTIMATION 3.1 Purpose of Thermal Load Estimation 3.2 Heating Load versus Cooling Load 3.3 Critical Conditions for Design 3.4 Manual versus Computer Calculations 3.5 Heating
Measuring The Right Thing For Humidity Control It s the Dew Point Stupid!
Page 1 of 6 Measuring The Right Thing For Humidity Control It s the Dew Point Stupid! By Mike Schell, AirTest Technologies Corp. A version of this article appeared in the June 2004 edition of Indoor Air
HVAC Calculations and Duct Sizing
PDH Course M199 HVAC Calculations and Duct Sizing Gary D. Beckfeld, M.S.E., P.E. 2007 PDH Center 2410 Dakota Lakes Drive Herndon, VA 20171-2995 Phone: 703-478-6833 Fax: 703-481-9535 www.pdhcenter.com An
By Tom Brooke PE, CEM
Air conditioning applications can be broadly categorized as either standard or critical. The former, often called comfort cooling, traditionally just controlled to maintain a zone setpoint dry bulb temperature
Presented by: Jennifer Doyle, P.E., RRC, LEED AP
Presented by: Jennifer Doyle, P.E., RRC, LEED AP Moisture Gas: Molecules are spread out "Vapor" suspended in air forms a mixture, present everywhere Liquid: Molecules are closer Rain Condensation Pipes
Dr. Michael K. West, PE 1 Dr. Richard S. Combes, PE 2 Advantek Consulting / Melbourne, Florida
Optimizing 100% Outside Air Systems with Heat Pipes Dr. Michael K. West, PE 1 Dr. Richard S. Combes, PE 2 Advantek Consulting / Melbourne, Florida Introduction To meet increasingly rigorous building codes
LIQUID DESICCANT AIR CONDITIONING Saves energy, Controls humidity, Cleans air. Trevor Wende Vice President, Marketing Advantix Systems, Inc.
LIQUID DESICCANT AIR CONDITIONING Saves energy, Controls humidity, Cleans air Trevor Wende Vice President, Marketing Advantix Systems, Inc. 0 Humidity: The Hidden Cost Driver Conventional A/C process Start
Energy Efficient Building Design College of Architecture Illinois Institute of Technology, Chicago. Relative Humidities RH% 49.4. 0.
Psychrometrics Psychrometric Chart Relative Humidities RH% 49.4 100% 80% 0.030 Enthalpies 70% H btu/lb 46.5 0.028 85 Not to Scale 0.026 Humidity Numbers and Values 43.7 60% Ratios are approximate 0.024
Theoretical Study on Separate Sensible and Latent Cooling Air-Conditioning System
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 2008 Theoretical Study on Separate Sensible and Latent Cooling Air-Conditioning
Dehumidification Frequently Asked Questions
Dehumidification Basics Why do you want to keep indoor Rh between 30-60%? ASHRAE recommends keeping the relative humidity in a home between 30-60% to limit the effects of many unwanted conditions and harmful
Flexibility, Efficiency In San Antonio Arena
2005, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). Reprinted by permission from ASHRAE Journal, (Vol. 47, No. 9, September 2005). This article may not
Causes of High Relative Humidity Inside Air Conditioned Buildings. Roger G.Morse AIA, Paul Haas CSP, CIH Morse Zehnter Associates
Causes of High Relative Humidity Inside Air Conditioned Buildings Roger G.Morse AIA, Paul Haas CSP, CIH Morse Zehnter Associates S. FLORIDA AVE. AMBIENT 91 F db / 78 F wb 16,000 HOURS ANNUALLY THAT wb
Minimizing Indoor Mold Problems through Management of Moisture in Building Systems
Minimizing Indoor Mold Problems through Management of Moisture in Building Systems Position Document Approved by ASHRAE Board of Directors June 30, 2005 AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING
To provide good indoor air quality
Conditioning Ventilation Air for Improved Performance and Air Quality The practice of using a mixing chamber for mixing outdoor and return in a single system should be replaced by a technique with two
Element D Services Heating, Ventilating, and Air Conditioning
Load Calculation Criteria PART 1 - GENERAL 1.01 OVERVIEW A. This section includes requirements for calculating HVAC cooling and heating loads. B. Load calculations must be performed in accordance with
Purpose: To determine the dew and point and relative humidity in the classroom, and find the current relative humidity outside.
Lab Exercise: Dew Point and Relative Humidity Purpose: To determine the dew and point and relative humidity in the classroom, and find the current relative humidity outside. Relative humidity is a measure
UNIVERSITY OF MISSOURI 23 0000 - Heating Ventilating and Air-Conditioning (HVAC) March 2015.01
GENERAL: This section provides general standards for overall sizing and design of Heating, Ventilating, and Air Conditioning (HVAC) systems. Other sections contain specific standards for each system per
Problems Related to Air Handler Leakage
The following article was published in ASHRAE Journal, January 28. Copyright 28 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. It is presented for educational purposes
Pool Dehumidification Basics
Copyright 2009 Wescor. All rights reserved. Permission granted to reproduce for personal and educational use only. When energy costs were low, many pool owners considered only first cost when choosing
By Donald Fisher, P.Eng., Associate Member ASHRAE
By Donald Fisher, P.Eng., Associate Member ASHRAE Decisions to purchase a commercial kitchen ventilation (CKV) system often are based on rule-of-thumb estimates using a $/cfm index (i.e., annual energy
Psychrometrics - The Study Of Air-Water Vapor Mixtures
One of the largest obstacles when dealing with building moisture complications is the confusion surrounding moisture properties and dynamics. Part of the challenge is the elusive nature of moisture characteristics
Home inspectors are not mold inspectors, however they do inspect for defects that
CONDENSATION IN THE WALLS Home inspectors are not mold inspectors, however they do inspect for defects that can result in mold. Mold grows in wet or damp environments. Defects that result in a wet or damp
Matching the Sensible Heat Ratio of Air Conditioning Equipment with the Building Load SHR
Matching the Sensible Heat Ratio of Air Conditioning Equipment with the Building Load SHR Final Report to: Airxchange November 12, 2003 Report prepared by: TIAX LLC Reference D5186 Notice: This report
Residential HVAC System Sizing
Residential HVAC System Sizing William P. Goss University of Massachusetts, Amherst, Massachusetts, USA Corresponding email: goss@acad.umass.edu SUMMARY Heating, ventilating and air-conditioning (HVAC)
Sustainable Preservation Practices for Managing Storage Environments Webinar: April 3, 2013
The Fundamentals of HVAC: What Shapes the Storage Environment Sustainable Preservation Practices for Managing Storage Environments Webinar: April 3, 2013 Introduction Presenter Jeremy Linden, Preservation
Mechanical and Natural Ventilation
BBSE3006: Air Conditioning and Refrigeration II http://www.hku.hk/bse/bbse3006/ Mechanical and Natural Ventilation Dr. Sam C. M. Hui Department of Mechanical Engineering The University of Hong Kong E-mail:
FLORIDA SOLAR ENERGY CENTER
FLORIDA SOLAR ENERGY CENTER Creating Energy Independence Since 1975 Impact of Energy-Efficiency Parameters on Home Humidity Rob Vieira Florida Solar Energy Center A Research Institute of the University
Smaller. Quieter. Smarter.
Smaller. Quieter. Smarter. Product Guide Dehumidifiers Welcome to Aprilaire Aprilaire, Your Partners in Comfort offers a complete line of dehumidifiers designed to meet the ever increasing needs of today
DUCT SYSTEM DESIGN CONSIDERATIONS Part 1
Refrigeration Service Engineers Society 1666 Rand Road Des Plaines, Illinois 60016 DUCT SYSTEM DESIGN CONSIDERATIONS Part 1 by Roger M Hensley, CMS TYPES OF SUPPLY DUCT SYSTEMS There are several basic
WHOLE-HOUSE VENTILATION SYSTEMS
Technology Fact Sheet WHOLE-HOUSE VENTILATION SYSTEMS Improved control of air quality Buildings for the 21st Century Buildings that are more energy efficient, comfortable, and affordable that s the goal
Humidity Control in School Facilities
Humidity Control in School Facilities By John C. Fischer Member ASHRAE Charlene W. Bayer, PhD. Member ASHRAE Consulting engineers who design school facilities are challenged with controlling space humidity
Controlling Wrap-Around Heat Pipes for Systems with Strict Space Humidity Requirements. By Michael O. Davis, PE, November 2015
Controlling Wrap-Around Heat Pipes for Systems with Strict Space Humidity Requirements By Michael O. Davis, PE, November 2015 Advised by Heat Pipe Technology Background: HVAC systems are often designed
Liabilities of Vented Crawl Spaces, Their Impacts on Indoor Air Quality in Southeastern U.S. Homes and One Intervention Strategy
Liabilities of Vented Crawl Spaces, Their Impacts on Indoor Air Quality in Southeastern U.S. Homes and One Intervention Strategy Jonathan Coulter 1 ABSTRACT This paper documents the influences vented crawl
Article. Protecting the Building Envelope from Water Damage. MemBrain Smart Vapor Retarder & Air Barrier Film
Article Protecting the Building Envelope from Water Damage Vapor Retarders Play a Crucial Role in Moisture Management Whether we like it or not, moisture in the form of water vapor diffusion and humid
Comparing Air Cooler Ratings Part 1: Not All Rating Methods are Created Equal
Technical Bulletin By Bruce I. Nelson, P.E., President, Colmac Coil Manufacturing, Inc. Comparing Air Cooler Ratings Part 1: Not All Rating Methods are Created Equal SUMMARY Refrigeration air coolers (evaporators)
Optimum Solar Orientation: Miami, Florida
Optimum Solar Orientation: Miami, Florida The orientation of architecture in relation to the sun is likely the most significant connection that we can make to place in regards to energy efficiency. In
How To Prevent Condensation
Managing Building Moisture, yz{ } ~ } ~,,,, y zz {{ }} ~~, Managing Building Moisture by Dennis Stanke, staff engineer La Crosse, Wisconsin Bruce Bradway, senior airside applications engineer Lexington,
Innovent LASER Packaged Fresh Air Conditioning Units
LASER Latent And Sensible Energy Reduction Latent And Sensible Energy Reduction For Outside Air Innovent LASER Packaged Fresh Air Conditioning Units Innovent LASER units provide both sensible and latent
May 14, 2013. Write Your Own (WYO) Principal Coordinators and the National Flood Insurance Program (NFIP) Direct Servicing Agent
U.S. Department of Homeland Security 500 C Street, SW Washington, DC 20472 W-13025a May 14, 2013 MEMORANDUM FOR: Write Your Own (WYO) Principal Coordinators and the National Flood Insurance Program (NFIP)
Humidification Strategies for Data Centers and Network Rooms
Humidification Strategies for Data Centers and Network Rooms By Tony Evans White Paper #58 Revision 1 Executive Summary The control of humidity in Information Technology environments is essential to achieving
Because here you can see a simple an elementary direct evaporative cooling system this is called as a single stage system you can see from the
Refrigeration and Air Conditioning Prof M. Ramgopal Department of Mechanical Engineering Indian Institute of Technology, Kharagpur Lecture No. # 38 Air Conditioning Systems Welcome back in the last lecture
Temperature and Humidity
Temperature and Humidity Overview Water vapor is a very important gas in the atmosphere and can influence many things like condensation and the formation of clouds and rain, as well as how hot or cold
Preventing Mold by Keeping New Construction Dry
Preventing Mold by Keeping New Construction Dry Lew Harriman Mason-Grant Consulting www.masongrant.com! How mold grows, and how fast! General drying procedures! Material-specific considerations! Removing
Underwriters Laboratories Testing Information
Underwriters Laboratories Testing Information R-8078 Underwriters Laboratories Inc. R-13173 Classified Spray Fiber Surface burning characteristics applied to inorganic reinforced cement board with a maximum
PHCC Educational Foundation Contractor Library Engineering Continuing Education
PHCC Educational Foundation Contractor Library Engineering Continuing Education Engineering-Specific Courses This list includes engineering-specific courses only. Descriptions for all approved courses
THE HUMIDITY/MOISTURE HANDBOOK
THE HUMIDITY/MOISTURE HANDBOOK Table of Contents Introduction... 3 Relative Humidity... 3 Partial Pressure... 4 Saturation Pressure (Ps)... 5 Other Absolute Moisture Scales... 8 % Moisture by Volume (%M
THE PSYCHROMETRIC CHART AND ITS USE
Service Application Manual SAM Chapter 630-16 Section 3A THE PSYCHROMETRIC CHART AND ITS USE Psychrometry is an impressive word which is defined as the measurement of the moisture content of air. In broader
ENHANCED LABORATORY HVAC SYSTEM
ENHANCED LABORATORY HVAC SYSTEM INTRODUCTION Since the early 1980's the attention to more energy efficient laboratory designs has been on the rise due to the increase in energy cost and the emergence of
Dedicated Outdoor Air-Dual Wheel System Control Requirements
4428 Dedicated Outdoor Air-Dual Wheel System Control Requirements Stanley A. Mumma, Ph.D., P.E. Fellow ASHRAE ABSTRACT The central thrust of this paper is to develop a clear understanding of the performance
Glossary of HVAC Terms
Glossary of HVAC Terms Heating, Ventilation and Air Conditioning (HVAC) is a major sub- discipline of mechanical engineering. The goal of HVAC design is to balance indoor environmental comfort with other
The Fallacies of Venting Crawl Spaces January 3, 2002 Craig DeWitt, PhD, PE
104 Vista Terrace RLC Engineering, LLC www.rlcengineering.com Clemson, SC 29631 info@rlcengineering.com 864.654.2979 The Fallacies of Venting Crawl Spaces January 3, 2002 Craig DeWitt, PhD, PE Almost 70%
VAV Laboratory Room Airflow The Lowdown on Turndown
Technology Report March, 2003 VAV Laboratory The Lowdown on Turndown Turndown comparison of these two turndown ratios. Note the small actual airflow difference between them. control ranges are normally
Element D Services Heating, Ventilating, and Air Conditioning
PART 1 - GENERAL 1.01 OVERVIEW A. This section supplements Design Guideline Element D3041 on air handling distribution with specific criteria for projects involving design of a Data Center spaces B. Refer
*Trademark of The Dow Chemical Company A business unit of The Dow Chemical Company and its subsidiaries Copyright 2003 The Dow Chemical Company.
Dow Chemical is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members.
Basic B.S. (building science) insights for. Spray Foam, HVAC and Moisture
Basic B.S. (building science) insights for Spray Foam, HVAC and Moisture Claudette Hanks Reichel, Ed.D. Professor and Extension Housing Specialist Director, LaHouse Resource Center When the blind leads
HVAC Checklist - Long Form
HVAC Checklist - Long Form Page 1 of 14 Appendix B discusses HVAC system components in relation to indoor air quality. utside Air Intake Location pen during occupied hours? Unobstructed? Standing water,
AIR SYSTEMS ENERGY SERIES Energy Recovery Wheels
AIR SYSTEMS ENERGY SERIES Energy Recovery Wheels APPLICATION GUIDE Supercedes: Nothing Form 102.20-AG6 (305) INTRODUCTION As fossil fuel reserves are depleted, the cost of energy continues to rise. According
Validation of a building simulation tool using field data for three identical. configuration full-serve restaurants using different HVAC Systems
Validation of a building simulation tool using field data for three identical configuration full-serve restaurants using different HVAC Systems Paul L. Brillhart, PhD nstructor University of llinois, Chicago
saving energy in comfort Factsheet Recair Enthalpy
saving energy in comfort Factsheet Recair Enthalpy Introduction Enthalpy Exchanger The enthalpy exchanger is able to transfer both sensible heat and latent heat (moisture) from the cooled to the heated
How To Control Humidity With A Humidifier
Control of ventilation and air conditioning plants Building Technologies s Contents.Temperature control in air treatment systems 2. Humidity controls 3. Recirculated air mixing. Internal heat sources 6.2
ENGINEERING WEATHER DATA
INTRODUCTION ENGINEERING WEATHER DATA Background. The data in this handbook were compiled by the Air Force Combat Climatology Center (AFCCC) at the request of the Air Force Civil Engineer Support Agency
Residential HVAC Load Sizing Training October 14, 2015. David Kaiser Green Code Plan Reviewer
Residential HVAC Load Sizing Training October 14, 2015 David Kaiser Green Code Plan Reviewer DCRA - Green Building Division Regulations of green codes including: Green Building Act Green Construction Code
Low Cost. Lower Energy Costs. Higher Efficiency.
HI-E DRY dehumidifiers remove two to three times more water per kilowatt hour of electricity than conventional dehumidifiers. Low Cost. Lower Energy Costs. Higher Efficiency. Therma-Stor designed an efficient,
Makeup Air For Exhaust Systems In Tight Houses. Tony Jellen Engineering Projects
Makeup Air For Exhaust Systems In Tight Houses Tony Jellen Engineering Projects PA Housing & Land Development Conference February 23, 2012 Effects of Kitchen Ventilation on Residential Dwellings Anthony
Software Development for Cooling Load Estimation by CLTD Method
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) ISSN: 2278-1684Volume 3, Issue 6 (Nov. - Dec. 2012), PP 01-06 Software Development for Cooling Load Estimation by CLTD Method Tousif Ahmed Department
THE PSYCHROMETRIC CHART: Theory and Application. Perry Peralta NC State University
THE PSYCHROMETRIC CHART: Theory and Application Perry Peralta NC State University PSYCHROMETRIC CHART Identify parts of the chart Determine moist air properties Use chart to analyze processes involving
Green Building Handbook for South Africa Chapter: Heating, Ventilation and Cooling Luke Osburn CSIR Built Environment
Green Building Handbook for South Africa Chapter: Heating, Ventilation and Cooling Luke Osburn CSIR Built Environment The heating, ventilation and cooling loads of typical commercial office space can range
Glossary of Heating, Ventilation and Air Conditioning Terms
Glossary of Heating, Ventilation and Air Conditioning Terms Air Change: Unlike re-circulated air, this is the total air required to completely replace the air in a room or building. Air Conditioner: Equipment
newsletter Let s take a high-level look at airside economizing: what it is, what it requires, and how it s done. How does economizer cooling work?
engineers volume 35 2 newsletter providing insights for today s hvac system designer keeping cool with outdoor air Airside Economizers from the editor For the denizens of commercial buildings, comfort
Key energy-efficient features of your new home
Key energy-efficient features of your new home Your thermal envelope The thermal envelope, or shell, of your home (walls, roof and floor) is designed to keep you dry and comfortable. It protects you from
Air Conditioning Contractors of America
Air Conditioning Contractors of America WHO IS ACCA???? Industry Manuals Residential D, J, S, H, RS, T, P A manual J load calculation is a measurement of how much heating and cooling capacity a home will
Housing Fact Sheets. Moisture Condensation at the Windows
Moisture Condensation at the Windows Housing Fact Sheets This fact sheet discusses the causes of and remedies for wintertime condensation problems that occur on windows, glass, and other glazing materials
Simulation of hygroscopic materials in the HVAC system of an office building
Simulation of hygroscopic materials in the HVAC system of an office building IEA/ECBCS Annex 41 Porto Meeting Melanie Fauchoux, Carey Simonson and David Torvi Department of Mechanical Engineering, University
Energy and Water Conservation Design Guide (for Sustainment, Restoration and Modernization [SRM] Projects and MILCON Construction)
![Energy and Water Conservation Design Guide (for Sustainment, Restoration and Modernization [SRM] Projects and MILCON Construction)](/thumbs/29/13383040.jpg "Energy and Water Conservation Design Guide (for Sustainment, Restoration and Modernization [SRM] Projects and MILCON Construction)")
Energy and Water Conservation Design Guide (for Sustainment, Restoration and Modernization [SRM] Projects and MILCON Construction) Prepared for Installation Management Command (IMCOM) 2511 Jefferson Davis
Infrastructure & Cities Sector
Technical Article Infrastructure & Cities Sector Building Technologies Division Zug (Switzerland), October 18, 2011 Saving Energy in a Data Center A Leap of Faith? New guidelines from ASHRAE (American
Old Dominion University Mold Management Plan
OFFICE OF ENVIRONMENTAL HEALTH AND SAFETY 5255 Hampton Blvd. Spong Hall, suite 2501 Norfolk, Virginia 23529 Phone: (757) 683-4495 Fax: (757) 683-6025 Occupational Safety & Health Environmental Health Laboratory
ASHRAE Climatic Data Activities. Dru Crawley Didier Thevenard
ASHRAE Climatic Data Activities Dru Crawley Didier Thevenard ASHRAE American Society of Heating Refrigerating and Air- Conditioning Engineers >50,000 members Major products: Handbooks (Fundamentals, Systems
VENTILATIVE COOLING EBC ANNEX 62 PER HEISELBERG DEPARTMENT OF CIVIL ENGINEERING
VENTILATIVE COOLING EBC ANNEX 62 PER HEISELBERG DEFINITION OF VENTILATIVE COOLING VENTILATIVE COOLING IS APPLICATION (DISTRIBUTION IN TIME AND SPACE) OF VENTILATION AIR FLOW TO REDUCE COOLING LOADS IN
DATA CENTER COOLING INNOVATIVE COOLING TECHNOLOGIES FOR YOUR DATA CENTER
DATA CENTER COOLING INNOVATIVE COOLING TECHNOLOGIES FOR YOUR DATA CENTER DATA CENTERS 2009 IT Emissions = Aviation Industry Emissions Nations Largest Commercial Consumers of Electric Power Greenpeace estimates
Presented By: WALTER E. JOHNSTON, PE CEM, CEA, CLEP, CDSM, CPE <walterjohnston@bellsouth.net
Presented By: WALTER E. JOHNSTON, PE CEM, CEA, CLEP, CDSM, CPE
Kitchen Ventilation Systems: Part 2 Providing Adequate Makeup Air
The Pennsylvania Housing Research Center Kitchen Ventilation Systems: Part 2 Providing Adequate Makeup Air Builder Brief: April 2012 Anthony C. Jellen, PE & Brian M. Wolfgang, EIT, Michael A. Turns, MS
Comparing Energy Savings of Different VAV Systems
Comparing Energy Savings of Different VAV Systems Prepared By: Martyn Dodd mart@energysoft.com EnergySoft LLC 1025 5th Street, Suite A Novato, CA 94945 415-897-6400 www.energysoft.com Last Modified: March
Selecting the Supply Air Conditions for a Dedicated Outdoor Air System Working in Parallel with Distributed Sensible Cooling Terminal Equipment
AT-01-7-3 Selecting the Supply Air Conditions for a Dedicated Outdoor Air System Working in Parallel with Distributed Sensible Cooling Terminal Equipment Kurt M. Shank Student Member ASHRAE Stanley A.
Natatorium Building Enclosure Deterioration Due to Moisture Migration
Buildings 2012, 2, 534-541; doi:10.3390/buildings2040534 OPEN ACCESS buildings ISSN 2075-5309 www.mdpi.com/journal/buildings/ Case Study Natatorium Building Enclosure Deterioration Due to Moisture Migration
Creating Efficient HVAC Systems
Creating Efficient HVAC Systems Heating and Cooling Fundamentals for Commercial Buildings Heating, ventilating, and air conditioning (HVAC) systems account for nearly half of the energy used in a typical
Camfil. Technical Services Bulletin Tools for Schools Filtration for Improved Indoor Air Quality
Camfil Technical Services Bulletin Tools for Schools Filtration for Improved Indoor Air Quality Most non-practitioners notice the HVAC system when it is too hot, or too cold, or in other ways not working