Two flows of air are both at 200 kPa; one has 3 kg/s at 400 K, and the other has 2 kg/s at 290 K. The two lines exchange energy through a number of ideal heat engines, taking energy from the hot line and rejecting it to the colder line. The two flows then leave at the same temperature, as in a co-flowing heat exchanger. Assume the whole setup is reversible, and find the exit temperature and the total power out of the heat engines.
Transportation Tuesday,April11,2017 9:21AM Transportationmakesup~30%ofUSenergyconsumption Transportationisthemajoruseofpetroleumandreliesonoilasanenergysource EnergyTransportationQuestions 1. Whatissogreataboutpetroleum -derivedgasolineWhydowerelyonittoday fortransportationWhataresomeoftheproblemswithrelyingonpetroleum 2. Whatarethealternativestooil,andwhataretheirprosandconsNaturalgas BiofuelsHydrogenElectriccars 3. HowcanefficiencyplayintothetransportationpictureCanwechangeour basicapproachtotransportation(includingpublictransport)andsaveenergy Howdoothermodesoftransportsuchasairplanesandtrainsfitintothe picture Transportatio