![]() ![]() 17 m/s, 0 kW.Ī condenser (cooler) receives 0 kg/s R-22 at 800 kPa, 40oC and cools it so the exit state is saturated liquid. ![]() How high a velocity must it generate and how much power is required to do that? Ans. b) Find specific work and specific heat transfer.Īn exhaust fan in a building should be able to move 2 kg/s air at 98 kPa, 20oC through a 0 m diameter vent hole. The specific work input hasīeen found to be given as Δ(Pv). KPa, -20oC and exit state is 400 kPa, 80oC (Neglect kinetic and potential energies changes). 45 0 C, X=0.Ī 4 kg/s steady flow of ammonia runs through a device where it goes through polytropic process. If the turbine produces 110 kW, find theĮxhaust temperature (and quality if saturated). Find theĮxit temperature and the ratio of exit pipe diameter to that of the inlet pipe (Dex/Din) so the velocity stays constant.Ī small turbine, shown in Figure, is operated at part load by throttling a 0 kg/s steam supply at 1 MPa, 250☌ĭown to 1 MPa before it enters the turbine and the exhaust is at 10 kPa. R-134a is throttled in a line flowing at 25oC, 750 kPa with negligible kinetic energy to a pressure of 165 kPa. Temperature (state quality/superheated) and the exit area of the nozzle. The ammonia exits at 300 kPa with a velocity of 450 m/s. ~V=0 m/s) and at the steady rate of 0 kg/s. Superheated vapor ammonia enters an insulated nozzle at 20☌, 800 kPa, with a low velocity (low velocity in nozzle What is the work involved in this process? What happens to the energy? A valve at the bottom is opened to let the air out and (T 2 >T 1 ),Ĭylinder has 0 kg air at 25oC, 200 kPa with a 5 kg piston on top. Temperature larger, equal to or smaller than 20oC? Does the final T depend on the size of the cylinder? Ans. 0 kg/s.Īn initially empty cylinder is filled with air from 20oC, 100 kPa until it is full. How much (kg/s) water coming in at 100 kPa,Ģ0 oC can the air heat to convert it in to saturated vapor? Ans. Comment on temperature if it is ideal gas.Īir at 600 K flows with 3 kg/s into a heat exchanger and out at 100oC. In case a saturated liquid is throttled,Ĭomment on liquid state and its temperature after throttling. ![]() What is the difference between the flow through nozzle and throttle process. (Air properties at 25 0 C, 100 kPa, Rair=0 kJ/kg-K, Cp,air=1 kJ/kg-K, Cv,air=0 kJ/kg-K)
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