Builiding a new library or addition?
This dynamic glass (as in not passive energy technology) tints automatically or on demand to control sunlight, without shades or blinds. SageGlass® - SAGE
It takes less electricity to operate 2,000 square feet of SageGlass than it does to power a single 60-watt light bulb. I think, if you have the will and the resources, this option is well worth a good hard look.
SageGlass’ electrochromic coating consists of five layers of ceramic material. Applying a low voltage of electricity darkens the coating as lithium ions and electrons transfer from one electrochromic layer to another electrochromic layer. How it Works - Technology - SAGE
Reversing the voltage polarity causes the ions and electrons to return to their original layer, causing the glass to return to its clear state
This solid-state reaction is controlled through a very low voltage power supply (less than 5V DC). A darkened state enables SageGlass to absorb and radiate away the sun’s unwanted heat and glare. A clear state allows you to maximize daylight and solar energy.
SAGE Electrochromics that can be switched from clear to tinted with the click of a button. The glass can also be programmed to respond to changing sunlight and heat conditions.
Zoning is also an option, meaning that panes that are hit by direct sunlight can tint, while ones receiving indirect sunlight can stay clear. (ref: mashable.com: 4 High-Tech Projects Making Cities More Energy Efficient )
Here is an photo from the SAGEGLASS BLOG: Architecture Review: West Hollywood Library among top works - Uncategorized - Sustainability - Glass in Architecture - Daylighting benefits - Brilliant Views - SAGE