rate is 10'3 mail: at an efciency of 80% relative to reversible adiabatic operation; The initial chamber temperature is 2TC and its initial pressure and ambient pressure are bath lm bar = 1.1}! x IOS Pa. Air can be assumed to behave as an ideal gas ochnstant heat capacity [CF = 29 Jr'mol K). (3} Describe how you would calculue the chamber pressure and temperature as a function of time. (b) Desa-ibe how you Would estimate [be minimum vacuum pump power rating required to pump the chamber pressure down to 0.1 bar. (:2) Eatimatc answers for (a) and (b) above using a suitable numerical solution prbcedure. NASA is trying to evaluate the performance of a space simulation chamber and needs your assistance. As shown in Figure P4.32, an electrically driven, rotary vacuum pump is used to evacuate a 10 m chamber. Except for a constant heat leak (9leak = 10 J/s) caused by the electronic gear kept inside the simulator, the system is adiabatic. In addition, a small air leak exists (N, = 10" mol/s at 27C). The pump's volumetric displacement