<p>Smart windows that modulate solar
radiation by changing their optical state in response to temperature stimulus
are developing as promising solutions towards reducing the energy consumption
of buildings. The market adoption of such systems has been slow due to the
barriers in scalability, cost, as well as complexity in their integration into
existing systems. Aiming these features,
we have proposed a retrofit smart window design based on the temperature-responsive
polymer Methyl Cellulose (MC). The system utilizes a sustainable, earth
abundant and cost-effective cellulose based thermo-responsive material to
transform existing windows to a thermally dynamic smart window system. The
observed optical change of MC from transparent to opaque state is dependent on
temperature and is triggered by the thermodynamic mechanism of reversible
coil-globule transition, which results in a stable performance of the proposed
device. Its solar modulation ability was studied using ultraviolet-visible-
spectroscopy. Effect of MC concentration and various salts on the optical
performance were investigated. It was found that the transition temperature the
polymer can be tuned by varying MC concentration and by adding salts to the
system. The tunability of transition temperature is a function of the concentration
of salt and the type of anion in the salt. It was observed that the transition
temperature of the window can be tuned between
to
, allowing a wide range of control over switching
temperature. Controllable LCST, low
freezing point, sustainable base material, scalable production, low cost,
retrofit system makes them ideal candidates for smart window applications. </p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/15082122 |
| Date | 30 July 2021 |
| Creators | Sai Swapneel Aranke (11209545) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/CELLULOSE_BASED_THERMOCHROMIC_SMART_WINDOW_SYSTEM/15082122 |
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