 Name:
Tina Anckarman
Where were you born?
Stockholm, Sweden
What is your primary field or area of interest?
Art.
What was your very first job?
Hmmmm - job? My grandfather forced me to pick his damn strawberries every summer when I was a kid, but it didn’t pay. Does it still count? My first paying job was as an art model at...
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January 7, 2009
Rochester, NY
Digital Print Permanence: Recent Research
Daniel Burge will speak at a seminar at Rochester Institute of Technology about Digital Print Permanence.
More Info
January 12 - 16, 2009
Stuttgart, Germany
James Reilly, along with Klaus Pollmeier, will be teaching students in the Conservation of New Media and Digital Information program at the Academy of Fine Arts Stuttgart.
January 23 - 25, 2009
Tucson, AZ
Photographic Materials Group (PMG) 2009 Winter Meeting
Zach Long and Gawain Weaver will present a paper on IPI’s Chromogenic Research Project. More Info
February 8 - 13, 2009
Caracas, Venezuela
4th Cultural Heritage Conservation Forum
James Reilly will present talks and workshops at the 4th Cultural Heritage Conservation Forum. More Info |
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Climate Notes is a free e-newsletter published by the Image Permanence Institute and designed for collection care staff in cultural institutions. Climate Notes covers a wide range of topics related to managing the environment for preservation.
"It’s all about Dew Point"
Will Jeffers, Museum of Fine Arts, Boston
When it comes to defining environmental conditions for collections, the first preservation concerns are the appropriate ranges of temperature and relative humidity (RH) for the given collection materials. After the temperature and RH targets are decided, the practical question follows: how do we achieve the desired values of temperature and RH? In practice, the environment you are able to achieve must be a balance between preservation quality, staff comfort, the ability of the mechanical systems to modify the outdoor climate, and energy efficiency. The answer is complex, and is rarely as simple as setting a dial to the right temperature and RH. Implementing changes to improve preservation quality requires a process by which balanced and informed decisions can be made, with active participation from collection care and facility management staff. To guide the discussions about controlling the environment, one essential tool is the dew point.
Indeed, experience has taught us that when it comes to managing environments for preservation, "it’s all about dew point."
"The new target is Dew Point"
Jake Nadal, UCLA Libraries
Quick facts:
- Dew Point represents the absolute moisture content of the air.
- Dew Point determines which temperature will give you which %RH.
- If your building does not have humidification or dehumidification, the indoor dew point is the same as the outdoor dew point.
- If your building has cooling-based dehumidification, the indoor dew point temperature is within a few degrees of the temperature of the cooling coil of your mechanical system.
What is Dew Point?
The Short Answer:
The Dew Point temperature is the temperature at which the relative humidity will reach 100% and moisture will begin to condense out of the air; in other words, it is the temperature at which dew will begin to form...
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#1) In practice, the dew point is often the limiting factor of your mechanical system.
A building's mechanical system is designed is to modify the outdoor air to achieve the appropriate conditions of the indoor air. This task involves adjusting both the temperature and the moisture content of the outside air. In general, it is easier (less energy consuming and more straight forward from a control point of view) for the mechanical system to cool or heat the air than it is to add or remove moisture. In other words, it is easier for the mechanical system to alter the temperature than it is to regulate the absolute moisture content of the air, (i.e., its dew point).
In winter, when the outdoor dew points are very low – and very little moisture is in the air – indoor dryness from very low %RH can be a problem. Excessive dryness can cause brittleness in papers, mechanical stress on composite objects...
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The Dew Point Calculator is now available online!
Visit www.dpcalc.org to explore its features.
The Dew Point Calculator allows you to:
- Explore the relationship of Temperature, Relative Humidity (RH), and Dew Point.
- Explore the preservation consequences of environmental conditions with respect to Natural Aging, Mechanical Decay, Mold Growth, and Metal Corrosion.
- Help plan, evaluate, and manage storage environments with respect to preservation benefits, preservation risks, or the realities and capabilities of your system.
The Preservation Evaluation section includes IPI's environmental ratings and preservation metrics, which analyze the preservation quality of the hypothetical storage environment represented on the calculator...
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Many of us are aware that seasonal changes affect the wellbeing of our collections. Changes in humidity can harm many different types of materials within our collections. So how does dryness really affect collections?
Dryness is one of the main culprits of mechanical damage. Objects tend to reach equilibrium with the air within the space or room where they are located. When changes in humidity occur, objects react in different ways to compensate for the change, and, at the same time, are affected in different ways. Dryness can cause contraction, and it can increase stress as well as brittleness. Dryness has the most impact on collection objects that are organic materials. Organic materials are hygroscopic in various degrees, which means that these materials absorb or desorb moisture according to environmental changes...
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