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Topic Area: High Performance Buildings

Displaying records 71 to 80 of 135 records.
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71. Blow-Down Tests Confirm Accurate Critical Flow Venturi Measurements During Transients
Topic: High Performance Buildings
Published: 8/14/2009
Author: John D Wright
Abstract: Critical flow venturis (CFVs) can be used to measure flow under transient pressure, temperature, and flow conditions with k=2 uncertainties of 0.4 % or less. Blow-down tests transferred 630 g of nitrogen during a 100 s interval from an unregulated cy ...

72. Comparison of Five Natural Gas Equations of State Used for Flow and Energy Measurement
Topic: High Performance Buildings
Published: 8/14/2009
Authors: Aaron N Johnson, William Johansen
Abstract: Measurements of the flow and the energy content of natural gas rely on equations of state to compute four thermodynamic properties: 1) compressibility factor; 2) critical flow factor; 3) speed of sound; and 4)isentropic exponent. We compare these com ...

73. Dynamic Gravitational Standard for Liquid Flow: Model and Measurements
Topic: High Performance Buildings
Published: 8/14/2009
Authors: Iosif I Shinder, Michael R Moldover
Abstract: We report progress in testing a dynamic gravimetric standard using both steady and unsteady water flows. For steady flows in the range 10 kg/s to 60 kg/s, the difference between the dynamic standard and NIST s static primary standard was 0.015 % wit ...

74. The Calculation of Natural Gas Viscosity
Topic: High Performance Buildings
Published: 8/14/2009
Authors: Aaron N Johnson, William Johansen
Abstract: The calculation of natural gas viscosity has been implemented many different ways including the use of constants. Different methods of calculating natural gas viscosity may produce values with differences as large as 50%. Increasing natural gas price ...

75. High Definition Flow
Topic: High Performance Buildings
Published: 8/1/2009
Authors: John D Wright, Michael R Moldover
Abstract: From pharmaceutical production to the natural gas market, exact flow measurements are critical. Here's how NIST helps keep us all on the same page.

76. The Virtual Cybernetic Building Testbed-A Building Emulator
Topic: High Performance Buildings
Published: 7/16/2009
Authors: Steven T Bushby, Michael A Galler, Natascha Sylvia Milesi-Ferretti, Cheol D. Park
Abstract: Building emulators couple computer simulations to real control hardware, creating a useful tool for studying building control system performance. The National Institute of Standards and Technology's Virtual Cybernetic Building Testbed (VCBT) is a ...

77. CYCLE_D: NIST Vapor Compression Cycle Design Program Version 4.0 Users' Guide
Series: OTHER
Topic: High Performance Buildings
Published: 6/23/2009
Authors: J S Brown, Piotr A Domanski, Eric W Lemmon
Abstract: The CYCLE_D package simulates vapor compression refrigeration cycles that use pure refrigerants or mixtures of refrigerants. The model can simulate a basic subcritical or transcritical refrigeration cycle, both with or without a liquid-line/suction-l ...

78. Viscosity and Density of CuO Nanolubricant
Topic: High Performance Buildings
Published: 6/23/2009
Author: Mark A Kedzierski
Abstract: This paper presents liquid kinematic viscosity and density measurements of a synthetic polyolester based copper (II) oxide (CuO) nanoparticle dispersion (nanolubricant) at atmospheric pressure for a temperature range from approximately 288 K to 318 K ...

79. Substrate-dependent interface composition and charge transport in films for organic photovoltaics
Topic: High Performance Buildings
Published: 6/9/2009
Authors: David Germack, Calvin Chan, Behrang H Hamadani, Lee J Richter, Daniel A Fischer, David J Gundlach, Dean M DeLongchamp
Abstract: The buried interface composition of polymer-fullerene blends is found by near edge X ray absorption fine structure (NEXAFS) spectroscopy to depend on the surface energy of the substrate upon which they are cast. The interface composition determines ...

80. Number Fluctuations and Energy Dissipation in Sodium Spinor Condensates
Topic: High Performance Buildings
Published: 6/5/2009
Authors: Yingmei Liu, Eduardo NMN Gomez, Stephen E Maxwell, Lincoln David Turner, Eite Tiesinga, Paul D Lett
Abstract: We characterize fluctuations in atom number and spin populations in F = 1 sodium spinor condensates. The time evolution of the population fluctuations shows a maximum. We interpret this as evidence of a dissipation-driven separatrix crossing in pha ...

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