Mechanical Testing and Diagnosis最新文献

{"title":"AN EVALUATION OF THE SOLAR AND WIND ENERGY IN THE SOUTH-EAST OF ROMANIA","authors":"Victoria Caranfil, E. Rusu, F. Onea, Dunărea de Jos","doi":"10.35219/mtd.2018.2.03","DOIUrl":"https://doi.org/10.35219/mtd.2018.2.03","url":null,"abstract":"The objective of the present work is to estimate the benefits which may be obtained from the implementation of a solar and wind project, by considering several reference sites, located in the southeastern part of Romania. In the first case study, the attractiveness of the solar energy will be evaluated for a production factory located in the vicinity of Galati city. The seasonal and annual fluctuation of solar energy will be discussed, by taking also into account the performances of a photovoltaic panel, which may be installed on the roof of these production halls. As for the second case study, the performances of some state-of-the-art wind turbines will be evaluated by taking into account three sites located along the Romanian shoreline, namely Sf. Gheorghe, Navodari and Vama Veche, respectively. According to these results, it was noticed that the photovoltaic panels will partially cover the energy demand for the selected factory, while in the case of wind energy, a single wind turbine defined by a rated capacity of 3 MW seems to easily cover the local electricity budget, reported in Sf. Gheorghe and Vama Veche.","PeriodicalId":125331,"journal":{"name":"Mechanical Testing and Diagnosis","volume":"89 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129076546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IMPROVING THE HEAT BALANCE BY USING THE EXHAUST GASES FOR A TANKER SHIP","authors":"Cătălin Fatair, A. Nedelcu, M. Dumitrache, Naval Transport","doi":"10.35219/mtd.2018.2.02","DOIUrl":"https://doi.org/10.35219/mtd.2018.2.02","url":null,"abstract":"Me ch anical Te s ting and Di agnosis IS S N 2247 – 9635, 2018 (VIII), Volume 2, pp. 11-14 IMPROVING THE HEAT BALANCE BY USING THE EXHAUST GASES FOR A TANKER SHIP Article DOI : https://doi.org/10.35219/mtd.2018.2.02 Catalin FAITAR1)*, Andra Teodora NEDELCU2), Mihail Lucian DUMITRACHE1) 1) Maritime Univers ity of Cons tanta, Faculty of Naval Electromechanics , 104 Mircea cel Batran, RO-900663, Cons tanta, Romania 2) Mircea cel Batran Naval Academy, Faculty of Navigation and Naval Trans port, 1 Fulgerului, RO-900218, Cons tanta, Romania * Corres ponding author: catalinfaitar@yahoo.ro ABSTRACT Exhaust gas energy recovery is more preferred than the energy contained in the cooling water. This is determined by the higher exhau st gas temperature, from 250 °C to 400 °C, for two-strok e engines and from 400 °C to 500 °C for four-strok e engines. Recovery is accomplished by means of a heat exchanger, called a heat recovery boiler or directly from the exhaust gas by the entrainment of a power turbine that drives an electric generator. Mitsubishi engines waste recovery systems consist of high-quality, highly efficient machinery that significantly increases ov erall vessel efficiency and it is an effective way to reduce th e EEDI (energy efficiency design index ). Very large crude carriers (VLCC) are among the biggest work ing freight vessels on the planet. With a capacity more than 250,000 dwt, these big ve ssels are equipped with two -strok e engines of high power. Keywor ds : heat, recovery, engine, boiler, parameters 1. INTRODUCTIO N The abs olute thermal balance is us ed when it comes to analyze the us e of thermal energy on a particular engine, while the s p ecific heat balance, as well as the relative thermal balance, are us ed both for analyzing the us e of thermal energy and for comparing, in terms of effective efficiency, one engine to another. The dis tribution of the heat flows for a particular operating regime of an engine is repres ented graphically in Fig. 1. This figure s hows the heat balance diagram in which the heat flows are divided into components corres ponding to the real s ituation. The los t heat flow, Qpd , is : Qpd =Qint ‐(Qu +Qpr +Qpg ) (1)","PeriodicalId":125331,"journal":{"name":"Mechanical Testing and Diagnosis","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124768820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}