CHEN 3101 Lecture Notes - Lecture 16: Enthalpy, Opata Language, Rankine Cycle

• School: UMN
• Department: Chemical Engineering
• Course: CHEN 3101
• Professor: David Morse

Document Summary

Test: mon oct. 13 (closed book, open mind, cheap calculator) -> primary means of generating electrical power (most electrical power plants work based on thissome variations) Similar to brayton cycle except for phase changes. Typical assumptions: turbine and pump = adiabatic and reversible ==> isentropic (usually the case if adiabatic and reversible) for the turbine for the pump. Chen thermo page 1 for the turbine: boiler and condenser = isobaric. Design constraints: lower bound on t4 (must be above ambient coolant, e. g. river, upper bound on t2 (turbine inlet) (mostly materials + cost constraints, t2 <=~ 600 ocb/c of creeping of steel) Overall (same for any heat engine, whether isothermal or not): Boiler boiler out (boiler in) (cond. in) (cond. out) Pc = 22. 1 mp =~ 221 bar constant p coexisting phases have equal t + p and unequal liq saturated liq constant p (red) Question: how many parameters required to specify the design.