Photoconductive Decay Lifetime and Suns-Voc Diagnostics of Efficient Heterojunction Solar Cells

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Date: May 1, 2008
Creator: Page, M. R.; Iwaniczko, E.; Xu, Y.; Roybal, L.; Bauer, R.; Yuan, H.-C. et al.
System: The UNT Digital Library

Comparison of Predictive Models for PV Module Performance (Presentation)

This paper examines three models used to estimate the maximum power (P{sub m}) of PV modules when the irradiance and PV cell temperature are known: (1) the power temperature coefficient model, (2) the PVFORM model, and (3) the bilinear interpolation model. A variation of the power temperature coefficient model is also presented that improved model accuracy. For modeling values of P{sub m}, an 'effective' plane-of-array (POA) irradiance (E{sub e}) and the PV cell temperature (T) are used as model inputs. Using E{sub e} essentially removes the effects of variations in solar spectrum and reflectance losses, and permits the influence of irradiance and temperature on model performance for P{sub m} to be more easily studied. Eq. 1 is used to determine E{sub e} from T and the PV module's measured short-circuit current (I{sub sc}). Zero subscripts denote performance at Standard Reporting Conditions (SRC).
Date: May 1, 2008
Creator: Marion, B.
System: The UNT Digital Library

Crystal Silicon Heterojunction Solar Cells by Hot-wire CVD (Presentation)

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Date: May 1, 2008
Creator: Wang, Q.; Page, M. R.; Iwaniczko, E.; Xu, Y. Q.; Roybal, L.; Bauer, R. et al.
System: The UNT Digital Library

Fireside Corrosion in Oxyfuel Combustion Environments,”

Oxy-fired or low-nitrogen combustion is a technology that will facilitate CO2 capture while also reducing NOx formation and which offers the opportunity for near-zero emissions coal combustion via either the retrofit of existing power plants, or the design of new power plants. Because of the opportunity to improve the environmental performance of the existing coal fired fleet (currently approximately 800 GW of capacity in the US alone) and the potential for converting these plants from air-blown to oxy-fired burners, NETL’s Office of Research & Development is focusing its attention on the impact of retrofitting existing plants on the service life of the materials of construction
Date: March 1, 2009
Creator: Holcomb, G. R.; Matthes, S. A.; Rawers, J. C. & Covino, B. S., Jr.
System: The UNT Digital Library

Optical Durability of Candidate Solar Reflector Materials

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Date: March 1, 2007
Creator: Kennedy, C.; Terwilliger, K. & Warrick, A.
System: The UNT Digital Library

The Wind/Water Nexus

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Date: June 1, 2006
Creator: Flowers, Laura
System: The UNT Digital Library

Parabolic Trough Receiver Heat Loss Testing (Poster)

Parabolic trough receivers, or heat collection elements (HCEs), absorb sunlight focused by the mirrors and transfer that thermal energy to a fluid flowing within them. Thje absorbing tube of these receivers typically operates around 400 C (752 F). HCE manufacturers prevent thermal loss from the absorbing tube to the environment by using sputtered selective Cermet coatings on the absorber and by surrounding the absorber with a glass-enclosed evacuated annulus. This work quantifies the heat loss of the Solel UVAC2 and Schott PTR70 HCEs. At 400 C, the HCEs perform similarly, losing about 400 W/m of HCE length. To put this in perspective, the incident beam radiation on a 5 m mirror aperture is about 4500 W/m, with about 75% of that energy ({approx} 3400 W/m) reaching the absorber surface. Of the 3400 W/m on the absorber, about 3000 W/m is absorbed into the working fluid while 400 W/m is lost to the environment.
Date: March 1, 2007
Creator: Price, H.; Netter, J.; Bingham, C.; Kutscher, C.; Burkholder, F. & Brandemuehl, M.
System: The UNT Digital Library

Photon and neutron productions studies in the MIPP experiment

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Date: May 1, 2006
Creator: Nigmanov, Turgun
System: The UNT Digital Library

The new D0 layer 0 silicaon detector

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Date: June 1, 2006
Creator: Strom, Derek A.
System: The UNT Digital Library