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Buildings & Construction

Energy efficiency

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Displaying 76 - 100 of 560

How Residential Water Heating is Changing

March 1, 2021
Author(s)
William M. Healy, Carl Hiller, James Lutz
Water heating system energy use is typically the second largest in U.S. residences behind space conditioning (space heating and cooling). Recent advances are changing the way water heating service is provided. This article describes hot water demand in

Integrative Method to Whole-House Energy and Comfort Rating

December 4, 2020
Author(s)
Hyojin Kim, Han Yan, Anuradha Kadam
The purpose of this research is to investigate how thermal comfort dynamics are impacted by energy-efficient or thermal comfort improvements in a low-load house and to explore methods or metrics to rate a whole-house performance in an integrative way based

Low global-warming-potential refrigerant CH2F2 (R-32): Integration of a radiation heat loss correction method to accurately determine experimental flame speed metrics

August 22, 2020
Author(s)
Gregory T. Linteris, Raik Hesse, Lukas Berger, Michael Hegetschweiler, Heinz Pitsch, Joachim Beeckmann
Due to their high global warming potential (GWP), hydrofluorocarbon refrigerants (HFCs) are systematically being phased out. Replacements with low GWP exist, but give rise to safety hazards as they are found to be mildly flammable. The assessment of the

High-brightness lasing at submicrometer enabled by droop-free fin light-emitting diodes (LEDs)

August 14, 2020
Author(s)
Robin P. Hansen, Amit K. Agrawal, Michael Shur, Jerry Tersoff, Babak Nikoobakht, Yuqin Zong
"Efficiency droop," i.e., a decline in brightness of light-emitting diodes (LEDs) at high electrical currents, limits the performance of all commercial LEDs and has limited the output power of submicrometer LEDs and lasers to nanowatts. We present a fin p

CONTAM User Guide and Program Documentation Version 3.4

August 3, 2020
Author(s)
William Stuart Dols, Brian Polidoro
This manual describes the computer program CONTAM version 3.4, developed by NIST. CONTAM is a multizone indoor air quality and ventilation analysis program designed to help determine airflows, contaminant concentrations, and occupant exposure in buildings
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