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Students Exposure to Sustainable Thermal Energy Storage Technologies at West Texas A&M University
In the mechanical and civil engineering programs at West
Texas A&M University, students are exposed to a variety
of sustainability-oriented projects through senior design
and research courses. The projects are selected to provide
an in-depth understanding of the investigated area through
analytical and experimental studies. In this particular
project, students in thermal design were asked to
investigate the feasibility of using paraffin-oil mixture as a
phase change material (PCM) in residential walls. A PCM
material with a melting point of 23°C (73°F) was designed
and mixed. The mass of PCM required for a 1 m2 (10.8 ft2)
wall (the size of the test apparatus) was determined to be
5.8 kg (12.8 lb) in a vertical 3.18 cm (1.25 in) thick sheet.
A wall containing the PCM and another wall designated as
a “control” were placed on 1 meter cubic insulated
structures and were monitored through controlled
experimentation. The testing was conducted indoors and an
interior heating element simulated four complete day
cycles. The result of the indoor study proved conclusively
that with the correct modifications and optimization, PCM,
as a form of insulation, is economically viable over its
lifespan of 20 years. The reduced cost to the owner of a 186
m2 (2,000 ft2) home is $129.73/year. The proposed design
causes a minuscule 5.76 kg/m2 (1.2 lb/ft2) of additional
load to the structure. Because the PCM is in the
configuration of a uniform sheet, the majority of the extra
load will be supported by the concrete slab of the home.Cockrell School of Engineerin
A M\"obius Characterization of Metric Spheres
In this paper we characterize compact extended Ptolemy metric spaces with
many circles up to M\"obius equivalence. This characterization yields a
M\"obius characterization of the -dimensional spheres and hemispheres
when endowed with their chordal metrics. In particular, we show that
every compact extended Ptolemy metric space with the property that every three
points are contained in a circle is M\"obius equivalent to for some
, the -dimensional sphere with its chordal metric.Comment: 24 pages, 1 figur
Seals Research at Texas A/M University
The Turbomachinery Laboratory at Texas A&M has been providing experimental data and computational codes for the design seals for many years. The program began with the development of a Halon based seal test rig. This facility provided information about the effective stiffness and damping in whirling seals. The Halon effectively simulated cryogenic fluids. Another test facility was developed (using air as the working fluid) where the stiffness and damping matrices can be determined. This data was used to develop bulk flow models of the seal's effect upon rotating machinery; in conjunction with this research, a bulk flow model for calculation of performance and rotordynamic coefficients of annular pressure seals of arbitrary non-uniform clearance for barotropic fluids such as LH2, LOX, LN2, and CH4 was developed. This program is very efficient (fast) and converges for very large eccentricities. Currently, work is being performed on a bulk flow analysis of the effects of the impeller-shroud interaction upon the stability of pumps. The data was used along with data from other researchers to develop an empirical leakage prediction code for MSFC. Presently, the flow field inside labyrinth and annular seals are being studied in detail. An advanced 3-D Doppler anemometer system is being used to measure the mean velocity and entire Reynolds stress tensor distribution throughout the seals. Concentric and statically eccentric seals were studied; presently, whirling seals are being studied. The data obtained are providing valuable information about the flow phenomena occurring inside the seals, as well as a data base for comparison with numerical predictions and for turbulence model development. A finite difference computer code was developed for solving the Reynolds averaged Navier Stokes equation inside labyrinth seals. A multi-scale k-epsilon turbulence model is currently being evaluated. A new seal geometry was designed and patented using a computer code. A large scale, 2-D seal flow visualization facility is also being developed
Texas A&M University at Galveston
Located in Galveston, Texas, the Marine Science Department offers several undergraduate degree programs and a graduate degree program in marine resources management. The department also conducts cutting edge research in oceanography, theory, and marine policy. Site offers curriculum and admissions information, as well as all the latest news and events, and photos of the lab and students doing research. Educational levels: Graduate or professional, Undergraduate lower division, Undergraduate upper division
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