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PAT Design Strategy for Energy Recovery in Water Distribution Networks by Electrical Regulation
In the management of water distribution networks, large energy savings can be yielded by exploiting the head drop due to the network pressure control strategy, i.e., for leak reductions. Hydropower in small streams is already exploited, but technical solutions combining efficiency and economic convenience are still required. In water distribution networks, an additional design problem comes out from the necessity of ensuring a required head drop under variable operating conditions, i.e., head and discharge variations. Both a hydraulic regulation (HR)—via a series-parallel hydraulic circuit- and an electrical regulation (ER)—via inverter- are feasible solutions. A design procedure for the selection of a production device in a series-parallel hydraulic circuit has been recently proposed. The procedure, named VOS (Variable Operating Strategy), is based on the overall plant efficiency criteria and is applied to a water distribution network where a PAT (pump as a turbine) is used in order to produce energy. In the present paper the VOS design procedure has been extended to the electrical regulation and a comparison between HR and ER efficiency and flexibility within a water distribution network is shown: HR was found more flexible than ER and more efficient. Finally a preliminary economic study has been carried out in order to show the viability of both systems, and a shorter payback period of the electromechanical equipment was found for HR mode.
Journal Article
My reading life
Bestselling author Pat Conroy acknowledges the books that have shaped him and celebrates the profound effect reading has had on his life.
Book
NONLINEAR QUANTITATIVE PHOTOACOUSTIC TOMOGRAPHY WITH TWO-PHOTON ABSORPTION
Two-photon photoacoustic tomography (TP-PAT) is a noninvasive optical molecular imaging modality that aims at inferring the two-photon absorption property of heterogeneous media from photoacoustic measurements. In this work, we analyze an inverse problem in quantitative TP-PAT where we intend to reconstruct optical coefficients in a semilinear elliptic PDE, the mathematical model for the propagation of near infrared photons in tissue-like optical media with two-photon absorption, from the internal absorbed energy data. We derive uniqueness and stability results on the reconstructions of single and multiple optical coefficients, and present some numerical reconstruction results based on synthetic data to complement the theoretical analysis.
Journal Article
A lowcountry heart : reflections on a writing life
A new nonfiction collection of letters, interviews, and magazine articles spanning Conroy's long literary career, supplemented by pieces from the author's many friends.
Book
Pat Cipollone arrives for Jan. 6 committee testimony
Former White House counsel Pat Cipollone arrived on Capitol Hill on July 8 for closed-door testimony with the Jan. 6 select committee.
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Patrick McCabe's Ireland : The butcher boy, Breakfast on Pluto and Winterwood
Few contemporary Irish writers have been more attuned to the historical influence of partition on Ireland's culture and literary representation than Patrick McCabe. In the recent context of Brexit, his work produced in the late nineteen nineties and early two-thousands carries considerable poignancy, especially in relation to the Catholic Church, gender roles and persistence of a history of violence in Ireland. This volume attends to three novels, The Butcher Boy, Breakfast on Pluto and Winterwood as an emblematic representation of Ireland in the late twentieth and early twenty-first centuries.0Contributors are: K. Brisley Brennan, Aisling Cormack, Flore Coulouma, Luke Gibbons, Lindsay Haney, Barbara Hoffmann, Jennifer Keating, James F. Knapp, Colin MacCabe, Kristina Varade.
Book
Ganoaustralins A and B, Unusual Aromatic Triterpenes from the Mushroom Ganoderma australe
Two triterpenes, ganoaustralins A (1) and B (2), featuring unprecedented 6/6/6/5/6 scaffolds were isolated from the fruiting bodies of the mushroom Ganoderma australe. The structures were determined by extensive NMR and HRESIMS spectroscopic analysis. The absolute configuration of the C-25 in ganoaustralin A was assigned by the phenylglycine methyl ester (PGME) method. The relative and absolute configurations of the polycyclic backbones were determined by NMR and ECD calculations, respectively. The plausible biosynthetic pathways of ganoaustralins A and B were proposed. Ganoaustralin B showed weak inhibition against β-secretase 1.
Journal Article