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- 5.) Find the temperature , specific volume ,internal energy ,enthalpy ,entropy of saturated steam at a pressure of 850 psia . 6.) Find the pressure ,specific volume ,internal energy ,enthalpy ,entropy of saturated water at 100 F.The figure shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well insulated and the pressure is very nearly 1 atm throughout. The volumetric flow rate entering at state 2 is AV2 = 4400 ft3/min. Assume the ideal gas model for air with cp = 0.24 Btu/lb·oR and ignore kinetic and potential energy effects. Determine the temperature of the air at the exit, in oF, and the rate of entropy production within the ducts, in Btu/min·oR.A cycle starts with an adiabatic compression of the air from state a with a volume V3 to state b with volume V1. At the end of the compression, heat is added (absorbed), resulting in an isobaric expansion to state c with volume V2 followed by an adiabatic expansion back to volume V3 at state d. Finally, heat is expelled, corresponding to an isochoric reduction completing the cycle and bringing air back to state a. Find the ratio between the initial and final temperatures for (1) the adiabatic compression, and (2) the adiabatic expansion in terms of the expansion ratio re = V3 /V2 and the compression ratio rc = V3 /V1..
- 3.) Find the pressure ,specific volume ,internal energy ,enthalpy ,entropy of saturated water at 300 F . 4.)Find the temperature ,specific volume ,internal energy ,enthalpy ,entropy of saturated steam at a pressure of 1 inch Hg absolute.Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the firstturbine until it is just dry saturated, then it is re-heated to 400 °C and expandedthroughthe second-stage turbine. The condenser pressure is 0.04 bar what is the pressure in bar at state 4 to 3 decimal places? what is the specific entropy in kJ/kg-K for state 5 to 4 d.p.?A frictionless piston-cylinder contains 42 kilograms of Acetylene having a pressure of 22 bar at 320 degrees Celsius. Heating occurs at constant pressure causing the piston to move until the volume is tripled. Compute for the (a) heat, (b) change in internal energy, (c) change in enthalpy (d) change in entropy, and (e) the non-flow work. (f) If ΔPE = 0.2 kJ and ΔKE = 1.35 kJ, what is the steady-flow work?
- A certain gas with cP= 0.530 Btu/lbm-R and R = 100 ft-lbf/ lbm-R expands from 10 cu.ft and 60 F to 30 cu.ft. while pressure remains constant at 20 psia. Compute a) T2 in oF b) dH c) dU d) dS e) For internally reversible nonflow process, what is Work?An automobile tire initially contains 0.25lb of air at 30psig, 70F and has an automatic valve that releases air whenever the pressure exceeds 32psig. After driving, the temperature of air inside rose to 90F. What mass of air escapes into the atmosphere?The figure belows shows three components of an air-conditioning system, where T3= 115°F and m˙3= 1.5 lb/s. Refrigerant 134a flows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady-state operation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible. Modeling air as an ideal gas with constant cp = 0.240 Btu/lb · °R, determine the mass flow rate of the air, in lb/s.
- 11. an ideal gas with MW= 33 is contained in a flexible tank. it is heated from 258.71 C to 559.35 C. if the change in internal energy is 178 kJ/kg, what is work in kJ/kgThere are 3 kg/min of steam undergoing an isothermal process from 30 bar and 350 o Cto 7 bar. (note 1 bar = 100 kPaa). Find: a) ΔS (kJ/k), b) Heat transferred (kJ), c) ΔH(kJ), d) ΔU (kJ)A mechanical-draft cooling tower receives 115 m3 /sec of atmospheric air at 101.325 kPa, 32oC DB temperature, 55%RH and discharges the air saturated at 36oC. If the tower receives 200 kg/sec of water at 40oC, what will be the approach?