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This paper compares the performance of CO2 and R-22 in residential air-conditioning applications using semi-theoretical vapor compression and transcritical cycle models. The simulated R-22 system had a conventional component configuration, while the CO2
This paper compares the performance of CO2 and R-22 in residential air-conditioning applications using semi-theoretical vapor compression and transcritical cycle models. The simulated R-22 system had a conventional component configuration, while the CO2
The first tests of super-effective flame inhibitors blended with CO2 have been performed in methane-air co-flow diffusion flames. Although the organometallic agents used are typically one or two orders of magnitude more effective inhibitors than CF3Br when
Kevin B. McGrattan, Howard R. Baum, Ronald G. Rehm, Glenn P. Forney, Kuldeep R. Prasad
Scientists and engineers are often asked to make predictions of the state of technology in the future and are usually laughably wrong. The best prognosticators get the trends right, but cannot possibly fill in the details. Think of Jules Verne predicting a
Xiaohong Gu, D T. Raghavan, Jack F. Douglas, Alamgir Karim
We investigate the dewetting of aqueous, evaporating polymer [poly(acrylic acid)] solutions cast on hydrophobic (polystyrene) substrates. As with typical dewetting, the evaporating films initially break up through the nucleation of holes that perforate the
Naural ventilation systems have long been employed in European residences to control indoor air quality and provide thermal comfort. European building designers have turned to natural ventilation to control air quality and cool commercial and institutional
The lattice Boltzmann method is a promising approach for modeling single and multicomponent fluid flow in complex geometries like porous materials. Here, we review some of our previous work and discuss some recent developments concerning fluid flow in
Jeffrey W. Gilman, W H. Awad, Rick D. Davis, John R. Shields, Richard H. Harris Jr., C H. Davis, A B. Morgan, T E. Sutto, J H. Callahan, Paul C. Trulove, H DeLong
The limited thermal stability of alkylammonium cations intercalated into smectite minerals (e.g., montmorillonite, MMT) and the processing instability of some polymers [polyamide-6 (PA-6) and polystyrene (PS)] in the presence of nanodispersed MMT have
The finite-element method is used to carry out parametric analyses on the thermal response of simulated defects in fiber-reinforced polymer (FRP) laminates applied to a concrete substrate. The aim is to assess the potential for quantitative infrared
We received two copies of the discussion: one from the journal and a corrected version directly from Dr. Chatterji. Based on the differences between the two versions, we realized that our choice of wording in the paper could be improved upon. While we were
Acoustophoresis has been used to study the evolution of the surface potential of hydrating cement suspensions because it is potentially capable of measuring zeta potentials of cement suspensions at concentrations high enough not to modify ion/particle
This report describes the use of adaptive integration for the calculation of view factors between simple convex polygons with obstructions. The accuracy of the view factor calculation is controlled by a convergence factor. The adaptive integration method
In the early part of the 20th century, a number of organizations including ASTM, the National Institute of Standards and Technology (NIST), and the Portland Cement Association collaborated in activities to improve and standardize specifications and test
This manual describes the computer program CONTAMW version 2.0 developed by NIST. CONTAMW is a multizone indoor air quality and ventilation analysis program designed to help you determine: airflows and pressures infiltration, exfiltration, and room-to-room
We present a simple methodology, developed for use in design assisted by electronic aerodynamic and climatological databases (for short, database-assisted design), that allows a realistic assessment of wind directionality effects. We apply the methodology
Standard provisions for wind loads on buildings have traditionally been based on summary tables and/or plots suitable for slide-rule calculations. The accuracy in the definition of wind loads inherent in such tables and plots is far lower than that
J. L. Bailey, Glenn P. Forney, P. A. Tatem, Walter W. Jones
The modeling of fire and smoke spread is an evolving field. As knowledge is acquired and resources become available, models are enhanced to make their predictions more accurate and/or their computations faster. This paper will discuss the Consolidated Fire