5. Discuss the different modeling assumptions for a Rankine power cycles.Please select all answers that apply:a) Each component is analyzed as a control volume at steady state.b) The turbine and pump operate adiabatically.c) Kinetic and potential energy changes are negligible .d) Source of energy isentropic.e) Sink of energy is isentropic. 8. Describe the relevance mixing fraction in combustion.Please select all answers that apply:a) Mixing fraction is the same as specific humidity.b) Mixing fraction is the same as absolute humidity.c) Mixing fraction is the same as relative humidity.d) Mixing fraction is a ratio of mass fractions of the oxidizer and fuel in the air, fuel, and mixture streams.e) Mixing fraction identifies the type of combustion in terms of lean, complete, or rich combustion.

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5. Discuss the different modeling assumptions for a Rankine pov Please select all answers that apply: a) Each component is analyzed as a control volume at steady state b) The turbine and pump operate adiabatically. c) Kinetic and potential energy changes are negligible. di Source of enerm icentronic

5. Discuss the different modeling assumptions for a Rankine pov Please select all answers that apply: a) Each component is analyzed as a control volume at steady state b) The turbine and pump operate adiabatically. c) Kinetic and potential energy changes are negligible. di Source of enerm icentronic

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1) One of the common devices used in Engineering is a nozzle to transfer fluids such as air. Assume a steady-state flow and air as an ideal gas with the following parameters: Inlet: Mass flow = 2.1 kg/s V1 = 0.72 m³/kg T1 = 600 K A = 240 cm? Outlet: V2 = 2.7 m³/kg A2 = 40 cm2 a) What is the air pressure at the outlet. b) What is the velocity of the airflow at the inlet. c) What is the velocity of air at the outlet.
Question 19 The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz = 25 m higher than the pump, where mass flow rate is 50 kg/s. Steady state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. Steam P3 = 30 bar T3 = 400°C 3 Turbine ▼ P4= 5 bar T₁ = 180°C h₂ = 417.69 kJ/kg Ocv = 2 kW Pump dz +Mixing chamber Saturated liquid water m₁, P₁ = 1 bar
2. A heat pump is like a refrigerator in that it uses work to take heat from a cold source (Tc, the inside of a house) and dumps it into a hot source (Th, usually the outdoor environment). a) Use the second law to find the magnitude of the work |w| needed to extract |qc] from the cold source and dump into the hot source. b) Assume all processes are reversible and the second law to explain why |w| > 0 if lgc] > 0 in part a).
The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz = 25 m higher than the pump, where in = 20 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. h = 417.69 kJ/kg Mixing chamber Ocy = 2 kW Steam P3 = 30 bar T3 = 400°C dz Wev Turbine Pump P4 = 5 bar 4 T = 180°C Saturated liquid water m, PL = 1 bar Determine: (a) the magnitude of the pump power, in kW. (b) the mass flow rate of steam, in kg/s, that flows through the turbine.
The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz = 5 m higher than the pump, where in = 50 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. h2 = 417.69 kJ/kg Mixing chamber Ocy = 2 kW Steam P3 = 30 bar T3 = 400°C dz Turbine Pump P4 = 5 bar T4 = 180°C Saturated liquid water m, Pi = 1 bar Determine: (a) the magnitude of the pump power, in kW. (b) the mass flow rate of steam, in kg/s, that flows through the turbine.
The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz = 25 m higher than the pump, where in = 80 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. h = 417.69 kJ/kg Mixing chamber Oey = 2 kW Steam P3 = 30 bar T3= 400°C dz Turbine Pump P4 = 5 bar T= 180°C 14 Saturated liquid water m, Pi = 1 bar Determine: (a) the magnitude of the pump power, in kW. (b) the mass flow rate of steam, in kg/s, that flows through the turbine.
Problem 1) Rankine Cycle Analysis Consider a simple Rankine cycle, steam power plant. The state points are defined in the schematic and the operating conditions are given in the Table la. The steam flow rate is 137.4 lbm/s. You may use "EES," but supply your code. a) Provide a quantitative T-s diagram including all state points, lines of constant pressure, and the "dome." b) Determine all the energy quantities and complete Table 1b. Discuss the value of the quality at state 4. c) Determine all the exergy quantities and complete Table 1c. Assume the dead state temperature is 77°F and the dead state pressure is 14.7 psia. d) Discuss your results. What additional insights does the exergy analysis provide? 3 Quoiler 4 Fuel State 1 2 3 4 State 1 2 3 4 State br (Btu/lbm) 1 ? 2 ? Boiler ? ? Table 1a: State Points and Other Items T (°F) p (psia) Variable ? 0.71 XI ? 700 turbine 1057 700 pump ? 0.71 boiler T (°F) p (psia) ? 0.71 Turbine ? 1057 ? Condenser Table 1b: Energy Results 700 700 0.71 W…
SU-1 A heat engine with &=0.400 operates between two heat reservoirs at 250K and 450K. The energy amounts and heat flow diagram for one cycle of operation of the engine is shown to the right. a) What is the change in entropy for the engine for one cycle of operation of the engine? b) Find the change in entropy for the engine surroundings for one cycle of operation of the engine. c) Find the change in entropy for the universe for one cycle of operation of the engine. d) Is this engine real, reversible, or impossible? Explain why using your results from the previous parts. Th-450K 500 200J Engne 300J T-250K
DRAW THE PV, TS DIAGRAMS AND SOLVE THE FOLLOWING 1. An ideal gas whose mass is 1.36 kg m, R = 204.51 J/kg m and k = 1.6667. Heat added during a reversible nonflow constant pressure change of state is 316.5 kJ. The initial temperature is 37.78 o C. Determine a) change in entropy (kJ/K), b) Work (kJ), c) ratio of expansion or V 2 /V 1. 2. An adiabatic expansion of air occurs through a nozzle (W s = 0) from 850 kPa and 75 o C to 140 kPaa. For an isentropic expansion find: specific volume (m 3 /kg m ), temperature ( o C), and velocity (m/s) at the exit section assuming initial kinetic energy is negligible. (PLS SHOW COMPLETE SOLUTION AND WRITE PROPERLY) (PLEASE ANSWER BOTH QUESTIONS PLEASE)
* Your answer is incorrect. A pump is used to circulate hot water in a home heating system. Water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. The inlet pressure and temperature are 14.7 lbf/in.², and 180°F, respectively; at the exit the pressure is 90 lbf/in.² The pump requires 1/15 hp of power input. Water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 Btu/lb. °R. Neglecting kinetic and potential energy effects, determine the temperature change, in °R, as the water flows through the pump. ΔΤ : = i 0.36 °R
4 STEAM P₁ = 40 BAR (AV), P₂ 3 P4 = Ask: = 70m3 min 20 Bar T₁ = 500°C T2= P3= 20 Bar SATURATED VAPOR 400°C T3 = 500°C KINETIC AND POTENTIAL ENERGY = STEADY STATE = 0,6 Bar TURBINE 1 TOTAL POWER iN kW RATE OF HEAT TRANSFER Ø GENERATED By а (data) TURBINE 2 REHEATER dQ/dt BOTH IN ки TURBINES IN THE RE HEATER
Q5. Discuss the following scenarios related to the first law of thermodynamics: a) On a hot summer day, a workshop employee turns his fan on when he leaves the room in the morning. When he returns in the evening, will the room be warmer or cooler than the neighbouring rooms? Why? Assume all the doors and windows are kept closed. b) A water pump that consumes 5 kW of electric power when operating is claimed to take in water from a lake and pump it to a pool whose free surface is 50 m above the free surface of the lake at a rate of 70 L/s. Determine if this claim is reasonable. c) A pump increases the pressure from 10 kPa to 70 kPa. Determine the power input required, to pump 2 m/s of water, given the inlet temperature of 15 °C. Does the inlet temperature have any significant effect on the required power?