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