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Buildings and construction

Energy efficiency

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Displaying 276 - 300 of 300

WATER TRANSPORT ACROSS A POLYMER ELECTROLYTE MEMBRANE UNDER THERMAL GRADIENTS

January 11, 2011
Author(s)
David L. Jacobson, Richard Fu, Takeshi Shiomi, Ugur Pasaogullari, Joshua Preston, Shinichi Miyazaki, Yuichiro Tabuchi, Daniel S. Hussey
A fundamental experimental and numerical study of the water transport across a perfluorosulfonic acid (PFSA) membrane under a temperature gradient is presented. The water transport phenomenon was experimentally investigated through water flux measurement

Residential Heat Pump Heating Performance with Single Faults Imposed

October 29, 2010
Author(s)
William V. Payne, Piotr A. Domanski, Seok Ho Yoon
A heat pump equipped with a thermostatic expansion valve (TXV) was tested in environmental chambers during steady-state no-fault and imposed-fault operation. The studied system was an R410A split residential heat pump with an 8.8 kW nominal cooling

Residential Heat Pump Heating Performance with Single Faults Imposed

July 11, 2010
Author(s)
Seok H. Yoon, William V. Payne, Piotr A. Domanski
A heat pump equipped with a thermostatic expansion valve (TXV) was tested in environmental chambers during steady-state no-fault and imposed-fault operation. The studied system was an R410A split residential heat pump with an 8.8 kW nominal cooling

Method to determine the absorbance of thin films for photovoltaic technology

June 20, 2010
Author(s)
Nathan A. Tomlin, John H. Lehman, Katherine E. Hurst, D. B. Tanner, K. Kamaras, Aron Pekker
We have demonstrated a novel method to determine optical properties of opaque or semi-transparent films for photovoltaic (PV) applications. Such films may be the basis of transparent conductors or photoconductive material. As an example, we measure the

On the 60 mV/dec @300 K Limit for MOSFET Subthreshold Swing

April 26, 2010
Author(s)
Kin P. Cheung
The 60 mV/dec limit for subthreshold swing at 300K is generally considered a fundamental limit that cannot be defeated. The physical origin of this limit is revisited in this paper and the fact that this limit is in part determined by the density-ofstates

Measurement Challenges in Achieving Energy Monitoring Systems in Buildings

March 3, 2010
Author(s)
William M. Healy
The benefits of energy conserving approaches in buildings are often not apparent to building occupants because of the insufficient feedback provided regarding energy consumption. A review of the literature suggests that energy feedback devices can provide

Ontology Development For Low-Energy Building Embedded Commissioning

November 17, 2009
Author(s)
Kwang Jun Lee, Omer Akin, Burcu Akinci, James Garrett, Steven T. Bushby
This paper presents the results of initial work in developing an ontology for improving information exchange and automation in building system commissioning practices. In our previous research dealing with the derivation of product models from building

Energy Price Indices and Discount Factors for Life-Cycle Cost Analysis 2009

May 31, 2009
Author(s)
Amy S. Rushing, Barbara C. Lippiatt
This is the 2009 edition of energy price indices and discount factors for performing life-cycle cost analyses of energy and water conservation and renewable energy projects in federal facilities. It will be effective from April 1, 2009 to March 31, 2010

The International State of Building System Commissioning

August 17, 2008
Author(s)
Natascha S. Milesi-Ferretti, Nobuo Nakahara, Harunori Yoshida
Buildings are a major and growing source of energy consumption and as such, contribute to the significant problems associated with energy dependence and growing environmental impacts. Building system commissioning is a quality assurance process designed to

Micro Effects for Single Phase Pressure Drop In Microchannels

March 3, 2008
Author(s)
Dong H. Han, Mark A. Kedzierski
This paper investigates the significance of several micro-effects that have been proposed to influence pressure drop measurements in microchannels. Pressure drop measurements were made for liquid flow within tubular microchannels nominally ranging in
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