Presentation on theme: "A simplified Flow Chart for Thermal Science"— Presentation transcript:
1 A simplified Flow Chart for Thermal Science Energy ConservationIrreversibilityAvailabilityQ:heatW: workEuler’s Eqn.Navier Stoke’s Eqn.Bernoulli’s EqnMech. Energy Cons.Note: this is only a brief overview of thermal science. Principles governing these physical phenomena havebeen greatly simplified in order to illustrate the inter-connectivity between disciplines.
2 A complete thermal system: Solar Power Plant Heat received by collector due to solar irradiation.Heat transfer to working fluid (oil or molten salt) by convection and conduction.High-temperature fluid heats water into steam via heat exchanger.Steam flows through typical thermodynamic cycle(s) (ex. Rankine cycle) to generate electricityCycle consists of a series of processes (ex. isentropic expansion in turbine, isentropic compression in pump, heat loss to condenser.)Work and energy balance will be calculated using 1st law of thermodynamics and thermal properties of working fluids.Fluid principles be used to analyze flow work in pump and turbine, pressure loss in piping system, convection in solar collectors.Thermal efficiency and availability calculated using 2nd law of thermodynamics
3 W: Work Solar Irradiation Wind Energy Fossil Fuels (Chemical Energy) Electric EnergyThermal EnergyEnergy ExchangeQ: Heat TransferThermal Systems:Solar Power PlantWind Energy Power PlantJet EngineInternal Combustion EngineRefrigeration & Heating EquipmentThermal Bubble Inkjet PrinterElectronic Cooling PackageWasteful Byproducts:Thermal PollutionAir/Water PollutionToxic ContaminationDU: Internal Energy ChangeGenerate Electrical EnergyTransform into Mechanical EnergyElectric Energy InputInkjet PrintingW: WorkWork Input and Output
4 Understand fundamentals of thermal science Energy Balance: Process DU = Q – W, Cycle DU = 0, Qcycle=WcycleThermal Efficiency: Power cycle h = Wout/QinRefrigeration cycle b = Qin/WcycleRelevant Issues:Understand fundamentals of thermal scienceImprove efficiency of existing thermal systemReduce environmental pollutionGreenhouse effect, ozone depletionDevise innovative thermal technologyInterdisciplinary knowledge is requiredMethodology used:System definition and modelingThermal properties identificationApply engineering principlesMass, momentum, energy conservationFirst and Second laws of ThermodynamicsHeat transfer modes
5 Turbine Solar Irradiation Solar Collector High-temp Low-temp fluid CondenserPumpHeat ExchangeSolar IrradiationHigh-tempfluidLow-tempsteamLow-temp,pressurizedwaterShaft work outputMixed water & vaporTurbineCooling water