the fundamentals of hvac : what shapes the storage...
TRANSCRIPT
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Webinar: April 3, 2013
The Fundamentals of HVAC: What Shapes the Storage Environment
Sustainable Preservation Practices for Managing Storage Environments
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Introduction
• Presenter – Jeremy Linden,
Preservation Environment Specialist
Image Permanence Institute, RIT
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Technical Support and Questions
• Shae Trewin – IPI Preservation Environment Specialist
• Lauren Parish – IPI Web Designer
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Technical Information • Cable internet preferred rather than wireless or dial-up • Participants can use their computer’s speakers (VoIP) or
telephone. • United States
Toll: +1 (909) 259-0026 Access Code: 630-859-458 Audio PIN: Shown after joining the webinar
• Need Help? Contact Lauren Parish at [email protected] or (585) 475-7175
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Questions? Submit questions using the Question Box located in the Go To Webinar control panel
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Sustainable Preservation Practices for Managing Storage Environments
About this project • An Education and
Training Grant from the National Endowment for the Humanities, Division of Preservation and Access
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Outline of Webinar • Influence of regional/local climate • Importance of the building envelope • Basics of HVAC systems: “The
Loop” – Heating/Cooling systems – Subcool/Reheat systems – Desiccant systems – Evaporative cooling
• Where the energy goes • Working as a team
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The Goal: An Optimal Preservation Environment
An optimal preservation environment is one
that achieves the best possible preservation of collections at the least possible consumption of energy, and is sustainable over time.
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Understanding HVAC
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Defined: • HVAC: Heating, Ventilation, Air Conditioning • Mechanical intervention to condition air to a
preferred temperature and relative humidity
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HVAC Systems are a Circular Stream of Moving Air: “The Loop”
Along Which: Temperature can be Raised or Lowered Humidity can be Raised or Lowered Filtration can Occur Outside Air can be Added and Removed
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HVAC System Components • Air Handling Unit • Supply Air Ducts • Spaces Served • Terminal Equipment • Return Air Path
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Buildings Commonly Have Multiple Systems; Systems Commonly Serve Multiple Spaces
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The Local Climate
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What do you have?
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Remember: Basic Thermodynamics
• Dew Point temperature is a representation of the actual moisture content of air (absolute humidity) – Higher the dew point, more moisture is
present – Lower the dew point, less moisture is present
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Local Climate
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Local Climate
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Local Climate
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Local Climate
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The Building Envelope
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Class One and Two Building Envelope
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Unheated Free-Standing Garage
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Class Three and Four Building Envelope
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Class Five Building Storage Area Envelopes
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Class Six Building Storage Area Envelopes
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What HVAC Systems Are Designed to Do
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Spaces with Exterior Exposure
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What HVAC Systems are Designed to Do
Remove Perimeter Heat Gain
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What HVAC Systems are Designed to Do
Supplement Perimeter Heat Loss
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What HVAC Systems are Designed to Do
Remove Heat Gain from Interior Zones
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Spaces with no Exterior Exposure
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What HVAC Systems are Designed to Do
Remove Heat Gain from Interior Zones
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What HVAC Systems are Designed to Do
Provide Ventilation
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What HVAC Systems are Designed to Do
Correct Humidity Gains or Losses
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Basics of HVAC Systems
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Boiler – Hot Water or Steam Energy Input: • Fuel
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Forced Air Furnace with Cooling
Energy Input: • Fuel • Fan Electricity • Compressor Electricity • Condenser Fan Elec.
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Basic Components of Direct Expansion (DX) Refrigeration
Systems
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Window or Thru-the-Wall Air Conditioner
Energy Input: • Fan Electricity • Compressor Electricity
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Condensing Units
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Basic Components of HVAC Systems Cooling Mode
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Basic Components of HVAC Systems Heating Mode
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Air Handling Unit (AHU) Components
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Air Handling Unit (AHU) Components
Fans, Ducts, Dampers
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Air Handling Unit (AHU) Components
Filter(s)
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Air Handling Unit (AHU) Components
Heating Coils
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Air Handling Unit (AHU) Components
Humidifier
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Air Handling Unit (AHU) Components
Cooling Coil/Dehumidifier
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Fundamentals of Air Temperature, Relative Humidity and Absolute Humidity Dehumidification by sub-cooling and reheating
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Cooling Coil Dehumidification
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Sources of Cooling/Heating/Humidification
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Desiccant
Dehumidification
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Desiccant Dehumidification at AHU
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Desiccant Dehumidification at AHU
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Desiccant Dehumidification at Outside Air
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Evaporative Cooling
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Evaporative Cooling
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Evaporative Cooling • Uses latent heat of vaporization to cool and moisten
outside air that is warm and dry • Often energy efficient compared to standard air
conditioning, practical choice for hot, arid climates • However:
– No dehumidification in system – Cooling can be reduced if moist outside air – Humidification is a by-product – cooling is the
primary purpose
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Terminal Devices Variable Air Volume Boxes
Reheat Coils Perimeter Radiation
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Controlling the System
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How does it all work together? • Set points drive the system
operation • Based on sensors in the space or
in the AHU
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• Control signal can be digital or pneumatic to valves, fan controls, damper actuators etc.
• Most systems are controlled from either a single sensor or an average group for temperature and RH
• Other sensor points are reference to check system operation
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Controls typically run: • Operating schedule • Set points • OA intake • Fan speed • Coil valves • Damper positions • All the moving parts!
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Working As A Team
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What is the Goal? Improving communication between Collections and Facilities staff: • Helps define
preservation and energy/operation goals
• Facilitates optimization process
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Collective Effort
• Requires participation of: – Collections – Administration – Facilities
• Process – not a project
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Project Web Site
• Visit www.ipisustainability.org – Information on upcoming webinars – Recordings of past webinars – Webinar and Workshop power point
presentations
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Reference Guidebook
• Project publication • Has bibliography of relevant
articles, guidelines and standards
• $25 – available from www.imagepermanence.org
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• May 1: Best Practices for Collecting and Analyzing Environmental Data • June 5: Dealing with Summer Heat & Humidity • July 10: Investigate Your HVAC System & Identify Potential Energy Savings –
Guest Speaker Peter Herzog, Herzog/Wheeler & Associates, Energy Management Consultant
• August 7: Practical Approaches to Environmental Control for Small Institutions – Guest speaker Richard Kerschner, Director of Preservation and Conservation, Shelburne Museum, Shelburne, Vermont
• September 4: Sustainable Preservation Practices
Webinars from Jan-April are available for viewing on ipisustainability.org
Upcoming Webinars
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Post Webinar Survey Please take a moment to complete the post-webinar survey that will be email to you.
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Questions? Submit questions using the Question Box located in the Go To Webinar control panel