An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
W W. Bannister, A Donatelli, F Bonner, F Lai, P Kurup, J Egan, E G. Jahngen, P Muanchareon, W Paramasawat, W Sriseubsai, S K. Chiang, V Kongkadee, S Sengupta, R Nagarajan, N Euaphantasate, V Parma, M Cazeca, E Chen, A Morales
This paper presents a comparable evaluation of R600a (isobutane), R290 (propane), R134a, R22, R410A, and R32 in an optimized finned-tube evaporator, and analyzes the impact of evaporator effects on the system coefficient of performance (COP). The study
This paper is an enhanced version of the paper, PERFORMANCE OF HC AND HFC REFRIGERANTS IN A FINNED-TUBE EVAPORATOR AND ITS EFFECT ON SYSTEM EFFICIENCY approved by WERB a few months ago and was presented at the Natural Refrigerants Conference. There are no
The effect of film thickness, substrate hole diameter, and shaft tip diameter on the applied strain energy release rate, G, of a thin film was measured using the shaft-loaded blister test. Test specimens consisted of plies of Kapton pressure sensitive
Samuel L. Manzello, Thomas G. Cleary, John R. Shields, Jiann C. Yang
An experimental apparatus has been built to investigate the ignition of fuel beds as a result of impact with burning firebrands. The apparatus allowed for the ignition and deposition of both single and multiple firebrands onto the target fuel bed. The
The curve-based method was evaluated based on performance predictions for nine mixed systems, which were also tested by an independent testing laboratory. Capacity predictions were within 5% of the tested values for six of nine mixed systems, and four of
Society is increasingly concerned about the implications of manufactured products for the environment, public health, and future costs. How does a product affect Global Warming, Smog, Fossil Fuel Depletion, and Human Toxicity? How about its Costs over Time
Building ventilation is a primary determinant of indoor air quality (IAQ) as it impacts contaminant concentrations and occupant comfort in terms of the perception of odor and irritation. However, relatively few measurements of office building ventilation
Jeffrey W. Gilman, Takashi Kashiwagi, A B. Morgan, Rick D. Davis, Richard H. Harris Jr., L D. Brassell
In 1997 NIST reported that polymer layered-silicate (clay) nanocomposites exhibit reduced flammability, in the form of reduced heat release rate (HRR). The unique character of this new approach to flame retard polymeric materials was the dual benefit of
This paper compares performance of CO2 and R22 in residential air conditioning applications using semi-theoretical vapor compression and transcritical cycle models. The simulated R22 system had a conventional component configuration, while the CO2 system
In this paper, a dissipative particle dynamics (DPD)-based approach for modeling suspensions is examined. A series of tests are applied comparing simulation results to well established theoretical predictions. The model recovers the dilute limit intrinsic
William L. Grosshandler, Nelson P. Bryner, Daniel M. Madrzykowski, K Kuntz
A fire occurred on the night of Feb. 20, 2003, in The Station nightclub at 211 Cowesett Avenue, West Warwick, Rhode Island. A band that was on the platform that night, during its performance, used pyrotechnics that ignited polyurethane foam insulation
A fire within a room or enclosure acts as a pump, pulling ambient air in while pushing combustion products mixed with air out. The openings through which the gases flow are referred to as vents and typically are doorways and windows. Quantifying the
Chiara F. Ferraris, Paul E. Stutzman, Max A. Peltz, John A. Winpigler
External sulfate attack of concrete is a major problem that can appear in regions where concrete is exposed to soil or water containing sulfates, leading to softening and cracking of the concrete. Therefore, it is important that materials selection and