轮机英语（二三管轮）Lesson 15 Air Conditioning System.ppt

Unit2AuxiliaryMachineryLesson15AirConditioningSystemNewWordsandExpressionshumidity[hju??m?d?ti]v.加湿barometer[b??r?m?t?(r)]n.气压表thermometer[θ??m?m?t?(r)]n.温度计disinfectant[?d?s?n?fekt?nt]n.消毒剂plenum[?pli?n?m]n.气室refrigerant[rifrid??r?nt]n.制冷剂propane[?pr?upe?n]n.丙烷drip[dr?p]v.滴NewWordsandExpressionsisobutane[?a?s??bju?te?n]n.异丁烷stagnate[st?ɡ?ne?t]v.淤塞，沉滞catchment[k?t?m(?)nt]n.集水，集油tray[tre?]n.托盘drainage[?dre?n?d?]n.排水viz[v?z]a.即；那就dictate[d?k?te?t]v.要求、规定superheat[su?p?hi?t]n.过热NewWordsandExpressionsdetermine[d??t??m?n]v.决定fine[fa?n]a.细的、精的separator[?sep?re?t?(r)]n.分离器filter[?f?lt?(r)]n.过滤器perforate[?p??f?re?t]v.穿过，穿孔depleting[d??pli?t??]n.消耗，用尽conversion[k?n?v???n]n.转换greenhouse[?ɡri?nha?s]n.温室NewWordsandExpressionsstringent[?str?nd??nt]a.严格的draft[drɑ?ft]n.起草dewpoint露点legionnaire’sbacteria军团菌群specificenthalpy比焓HCFCs氢氯氟烃类CFCs氯氟烃类HFCs氢氟烃Airconditioningisthecontrolofhumidity,temperature,cleanlinessandairmotion.Winterconditioningrelatestoincreasingtemperatureandhumiditywhilstsummerconditioningrelatestodecreasingtemperatureandhumidity(空调是用来控制湿度、温度、清新度和空气的流通。冬天空调用来增加温度和湿度，而夏天空调用来减少温度和和湿度).Specifichumidityistheratioofthemassofwatervaportothemassofdryairinagivenvolumeofmixture.Percentrelativehumidityisthemassofwatervaporperm3ofaircomparedtothemassofwatervaporperm3ofsaturatedairatthesametemperature.Thisalsoequalstheratioofthepartialpressureofactualaircomparedtothepartialpressureoftheairifitwassaturatesatthesametemperaturei.e.m/mg=p/pgThebasicprinciplesofairconditioningBarometerpressure=partialpressureofN2+p.p.O2+p.p.H2O,fromDaltonsLawviz:?Pressureexertedby,andthequantityof,thevaporrequiredtosaturateagivenspace(i.e.existassaturatedsteam)atanygiventem