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Displaying records 21 to 30 of 32 records.
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21. Hitting the bounds of chemistry: Limits and tradeoffs for low-GWP refrigerants.
Topic: Energy Conservation
Published: 8/19/2015
Authors: Mark O McLinden, J. Steven Brown, Andrei F Kazakov, Piotr A Domanski
Abstract: We explore the possibilities for low-GWP refrigerants through two approaches. First, we explore the performance of hypothetical refrigerants to define the limits of what is allowed by thermodynamics. In the second approach, we apply property estimati ...

22. Large-area irradiance-mode spectral response measurements of solar cells by a light-emitting-diode- based integrating sphere source
Topic: Energy Conservation
Published: 5/30/2014
Authors: Behrang H Hamadani, John F Roller, Andrew M. Shore, Brian P Dougherty, Howard W Yoon
Abstract: An irradiance-mode absolute differential spectral response measurement system based on a light emitting diode (LED) array is described. The LEDs are coupled to an integrating sphere whose output irradiance is uniform to better than 2 % over an ar ...

23. Life-Cycle Carbon and Cost Analysis of Energy Efficiency Measures in New Commercial Buildings
Topic: Energy Conservation
Published: 3/1/2010
Author: Joshua D Kneifel
Abstract: Building energy efficiency has become a top priority due to the recent energy price spikes and increasing concern regarding climate change. It is easier and less costly to increase energy efficiency in new buildings than in existing buildings, making ...

24. Measurement Challenges in Achieving Energy Monitoring Systems in Buildings
Series: Technical Note (NIST TN)
Report Number: 1656
Topic: Energy Conservation
Published: 3/3/2010
Author: William M Healy
Abstract: 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 p ...

25. Micro Effects for Single Phase Pressure Drop In Microchannels
Topic: Energy Conservation
Published: 3/3/2008
Authors: Dong H. Han, Mark A Kedzierski
Abstract: 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 i ...

26. Normalized Performance Parameters for a Residential Heat Pump in the Cooling Mode with Single Faults Imposed
Topic: Energy Conservation
Published: 3/3/2014
Authors: William V Payne, Jin Min Cho, Piotr A Domanski
Abstract: The performance of a residential split heat pump in the cooling mode operating under nine faults was described using normalized performance parameters determined from a ratio of the faulty value to the no-fault value obtained from heat pump tests in ...

27. Performance Ranking of Refrigerants With Low Global Warming Potential
Topic: Energy Conservation
Published: 1/7/2015
Authors: Mark A Kedzierski, J S Brown, Junemo Koo
Abstract: This paper evaluates in a typical air-conditioner the cycle performance of thirty-nine refrigerants identified in the AHRI Low Global Warming Potential (GWP) Alternative Refrigerants Evaluation Program (Low-GWP AREP). The Low-GWP AREP was initiated ...

28. Power Supply Issues for Wireless Sensor Networks: A Review
Topic: Energy Conservation
Published: 3/1/2014
Authors: Wenqi Guo, William M Healy, Mengchu Zhou
Abstract: Wireless sensor networks (WSNs) have enabled numerous embedded wireless applications in different areas such as military/battlefield, environmental monitoring, and intelligent building systems. They consist of a large number of nodes that need to ope ...

29. Residential Home Performance Contracting Round Robin Guidelines
Series: Grant/Contract Reports (NISTGCR)
Report Number: 14-976
Topic: Energy Conservation
Published: 4/17/2014
Authors: Michael Lubliner, Rick Kunkle, David Hales, Melinda Spencer
Abstract: These guidelines describe the important considerations for planning, conducting, analyzing, and disseminating the results of a Home Performance Contactor (HPC) round robin study of a specific aspect of the HPC industry services. The round robin study ...

30. Sealed Gravitational Capillary Viscometry of Dimethyl Ether and Two Next-Generation Refrigerants
Series: Journal of Research (NIST JRES)
Report Number: 117.014
Topic: Energy Conservation
Published: 9/26/2012
Authors: Dylan S. Cousins, Arno R Laesecke
Abstract: The viscosity of dimethyl ether (DME, C2H6O) and of the fluorinated propene isomers 2,3,3,3- tetrafluoroprop-1-ene (R1234yf, C3H2F4) and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) was measured in a combined temperature range from 242 K to 350 K ...

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