Post on 17-Mar-2018
transcript
Temperature & Humidity ControlsFolger Shakespeare Library
Preserving the world’s largest collection of Shakespeare’s works
Types of Spaces
Exhibit Spaces (70F & 45%RH) Exhibition Hall (AHU7) Reading Rooms (AHU6, AHU14, AHU15) Founder’s Room (AHU8) West Wing Hallways (AHU8)
Collection Spaces (65F & 45%RH )
Deck B (AHU2)
Deck C (AHU1)
STC Vault (AHU5)
Art Vault (AHU5)
All of these areas struggled to provide
adequate temperature and humidity control in
2010.
Seasonal setpoint changes : +/- 5 RH.
IPI Consultation(Image Permanence Institute)
Investigation Monitored existing conditions remotely
Space conditions AHU conditions Outside Air conditions
Onsite Coordination Duration was 1 year (2010-2011)
All 4 seasons
Recommendations
Upgrade Controls
Add chiller & AHU4 replacement
Renovate 3 AHU’s
AHU7
AHU14
AHU15
Implementation
Immediate Changes Continue to monitored existing conditions Climate Liaison & Facilities Coordination Daily Operational Changes
Tweaks to PM schedule Material changes Damper changes
Initiate Phased Controls Upgrade
Long-Term Changes
Begin design phase with Mueller
Implemented IPI’s recommendations
Energy Management
VFD’s and Heat Recovery chiller
Specific DDC system (JC FX Server)
Focus on collection requirements
Psychometrics
Dry Bulb Temperaturethe familiar “air temperature” measured by an ordinary thermometer which has a dry sensing bulb (displayed on horizontal axis)
Wet Bulb Temperature –the temperature at which evaporation takes place (diagonal parallel lines)
Psychrometrics
Relative Humidity
expresses the air’s moisture content as a percent of its maximum capacity at its current dry-bulb temperature (displayed as a series of curves)
The 100% rh curve forms the upper boundary of the chart (saturation curve).
Psychrometrics
Dew Point Temperature
The temperature at which moisture will begin to condense from the air (move horizontally to the left to intersect the 100% rh curve).
When the dry-bulb temperature of the air cools to the same value as the dew point temperature, the air is said to be “saturated” – it has reached 100% relative humidity.
Psychrometrics
Dew Point Temperature
Air in the boundary layer near a cold surface gives up some of its heat to that surface. If the air cools sufficiently, it may fall below its dew point temperature, so it can longer retain all the water vapor it carried originally. The dew forms on the nearest surface, as shown in the photo.
The surface temperature of the shaker is 32°F, and the dew point of the surrounding air is 60°F (80°F / 50% rh)°
Dehumidification Using Cooling Coil
Most dehumidification in commercial buildings is accomplished by cooling coils.
Air is chilled low enough to drop its dry-bulb temperature below its initial dew point temperature.
As the air drops below its dew point temperature, water vapor condenses on the cold surfaces of the cooling coil, and drains away from the air as liquid condensate
Dry Bulb Temperatures
Dew Point Temperatures
Outdoor Air Ambient Annual Conditions
Rare Collections Conditions
Rare Collections Outdoor Air Unit
Rare Collections Chilled Glycol System
Exhibition Hall & Reading Room
Exhibit Hall & Reading Room Conditions
Exhibition Hall & Reading Room AHU Schematics
Current Status
AHU7, AHU14, AHU15, AHU4, and supplemental chiller have been completed. Including new equipment and controls. T&B and Commissioning have been completed.
Replacement of Primary Steam Convertor
Installation of multiple hot water reheat coils to assist with recovered heat from chiller
Phased Controls Upgrade Upgraded main master controller Upgraded all AHU controllers Upgraded all defective sensors or valves Tied in all stand alone DX units, dehumidifiers, and humidifiers Currently upgrading all steam convertor sensors and valves. To be completed in March.
Delivery of new Clean Steam Generator tomorrow
Replacement of many smaller components.
Continuing Efforts Software Modifications
Full range of management Deficiency Alarms Seasonal Set point changes
Seasonal reset schedule Heat recovery chiller Hot Water Loop (Steam Convertors)
Replacement of 6 Steam Convertors
Replacement of AHU5 (Summer 2015)
Commissioning of AHU6 & AHU8
Replacement of additional hot water reheat coils
Continue to upgrade all defective sensors or
valves
Upcoming Mechanical Upgrades
Questions?
David Conine, Head of Facilities(202) 608-1705
dconine@folger.edu
Todd Garing, Vice President(410) 646-4500
tgaring@muellerassoc.com