Unit1MainPropulsionPlantLesson7CoolingWaterSystem7.1Freshwatercoolingsystem7.2Seawatercoolingsystem7.3ThecentralcoolingsystemNewWordsandExpressionslayout[?le?a?t]n.布局，设计abundance[??b?nd?ns]n.充裕，丰富distilledwater蒸馏水scale[ske?l]n.结垢formation[f???me??n]n.形成component[k?m?p??n?nt]n.组件，元件leakage[?li?k?d?]n.泄漏，渗漏物，漏出量dedicated[?ded?ke?t?d]a.专用的NewWordsandExpressionsheadtank膨胀水柜膨胀水柜deliberately[d??l?b?r?tli]ad.故意地，特意地replenish[r??plen??]v.补充，再装满，把…装满log[l?ɡ]v.记录priorto在……之前incorporate[?n?k??p?re?t]v.包含dump[d?mp]v.倾倒NewWordsandExpressionsreuse[?ri??ju?s]v.再次使用，重复使用erosion[??r???n]n.侵蚀，腐蚀phenomena[f?n?m?n?]n.现象inherent[?n?her?nt]a.固有的，内在的aggressive[??ɡres?v]a.侵略性的，好斗的agglomeration[??ɡl?m??re??n]n.凝聚，结块，（杂乱的）一批meshsize筛孔尺寸，网格大小，目径choke[t???k]v.阻塞NewWordsandExpressionsfrequency[?fri?kw?nsi]n.频率cavitation[,k?v?te??(?)n]n.气蚀，气穴现象，空穴作用turbulence[?t??bj?l?ns]n.湍流thermalefficiencyn.热效率Generally,inthedieselenginecoolingsystem,thedieselengineisforcedtocoolwithfreshwater,andthenthefreshwaterandotherheatcarryingfluids(suchaslubricatingoil,pressurizedair,etc.)areforcedtocoolwithseawater.Inthesystemlayout,theformerbelongstotheclosedcycle,whilethelatterbelongstotheopensystem.Althoughthereisanabundanceoffreeseawateravailable,marinedieselenginesdonotuseitdirectlytokeepthehottestpartsoftheenginecool.Thisisbecauseofthecorrosionwhichwouldbecausedinthecoolingwaterspaces,andthesaltswhichwouldbedepositedonthecoolingsurfacesinterferingwiththeheatflow.Instead,thewatercirculatedaroundtheengineisfreshwater(orbetterstill,distilledwater)whichisthenitselfcooledusingseawater.Thisfreshwateristreatedwithchemicalstokeepitslightlyalkaline(topreventcorrosion)andtopreventscaleformation.
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