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Field demonstration of superior performance of advanced building envelope technologies

: Shukla, N.; Watts, A.; Kosny, J.

American Society of Heating, Refrigerating and Air-Conditioning Engineers -ASHRAE-, Atlanta/Ga.:
Buildings XIII Conference. Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference 2016 : December 4-8, 2016, Clearwater Beach, Florida
Atlanta, GA: ASHRAE, 2016
ISBN: 978-1-939200-50-1
ISBN: 978-1-5108-6001-8 (Ausgabe Curran)
International Conference "Thermal Performance of the Exterior Envelopes of Whole Buildings" <13, 2016, Clearwater Beach/Fla.>
Conference Paper
Fraunhofer CSE ()

Aerogels, phase-change materials (PCMs), and vacuum insulation panel (VIPs) are the three emerging technologies that have potential to significantly reduce building-envelope-generated (wall, roof, etc.) energy loads. Although performance characteristics of these technologies have been well established in numerical simulations and laboratory-scale experiments, there is a general lack of real application data demonstrating their energy-saving potential. In this work, we use a combination of outdoor test structures located in Albuquerque, New Mexico, and a façade panel platform located in Boston, Massachusetts, to investigate the field performance of these advanced technologies. The following configurations were examined: 10 mm (3/8 in.) thick aerogel blanket (R-0.7 m2·K/W) with reflective facings in the roof and gable envelopes of a test structure in Albuquerque, PCM (5 mm [0.2 in.] thick sheets of a shape-stabilized PCM) in the ceiling of a test structure in Albuquerqu e, and a VIP assembly (25 mm [1in.] extruded polystyrene [XPS] + 25 mm [1in.] VIP + 25 mm [1in.] XPS; R-5.28 m2·K/W) in the walls of a façade panel platform in Boston. The field data were collected during the summer season of 2014. Reflective aerogel and PCM configurations were found to save approximately 38% and 2.5%, respectively, in the cooling energy demand through the ceiling compared to the reference configuration built to standard insulation levels. In addition, PCM configuration showed as much as 4.5 hours of time shift in daily peak ceiling heat flux, with an average of 1.68 hours for the duration of the projectâan attractive feature in regions with dynamic electricity tariffs. Façade test data showed a dramatic reduction in wall heat flux through the VIP wallassembly compared to a similar-thickness expanded polystyrene (EPS) insulatedwall assembly.