Fundamentals Of Engineering Thermodynamics
9th Edition
ISBN: 9781119391388
Author: MORAN, Michael J., SHAPIRO, Howard N., Boettner, Daisie D., Bailey, Margaret B.
Publisher: Wiley,
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Turbines, compressors, boilers, condensers, and heat exchangers operate for long periods of time under the same conditions, and they are classified as __________ flow devices.
Separate streams of air and water flow through the compressor and heat exchanger arrangement shown in the figure below, where m˙1= 0.6 kg/s and T6= 50°C. Steady-state operating data are provided on the figure. Heat transfer with the surroundings can be neglected, as can all kinetic and potential energy effects. The air is modeled as an ideal gas.
Determine:(a) the total power for both compressors, in kW.(b) the mass flow rate of the water, in kg/s.
I need help going through the process to solve this problem, I think I have a general idea, but want to make sure I am doing it correctly.
A counterflow heat exchanger operates at steady state while being well-insulated from the surroundings with air and ammonia flowing in separate streams. Ammonia enters at state 1 with -30°C and a quality of 30% and exits at state 2 as saturated vapor at -30°C. Air enters at state 3 with pressure 1 bar and temperature 295 K and exits at state 4 with pressure 1 bar and temperature 265 K. The flow rate of air is 10 kg/s. Ignore kinetic and potential energy effects, and take the dead state as 1 bar and 300 K.
a. Describe the heat transfer inside the heat exchanger (what is transferring heat to what?)
b. Determine the specific enthalpy of each state, in kJ/kg.
c. Determine the mass flow rate of ammonia, in kg/s.
d. Determine the rate of exergy destruction within the heat exchanger, in kW.e. Devise and evaluate an exergetic efficiency for the heat…
Chapter 4 Solutions
Fundamentals Of Engineering Thermodynamics
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- Need help please :)arrow_forwardIt generates power in a process consisting of air compressor-heat exchanger and turbine units. Air is considered the ideal gas. The compressor and turbine are adiabatic and the kinetic and potential energy changes in the units are negligible. The specific heat of the air is 1,005 kJ / kgK, k = 1,4. Accordingly, how many kW is the compressor power?, ps: ısı ejanşörü = heat exchanger kompresör= compressor türbin = turbinearrow_forwardExpert Q&A A counterflow heat exchanger operates at steady state while being well-insulated from the surroundings with air and ammonia flowing in separate streams. Ammonia enters at state 1 with -20°C and a quality of 20% and exits at state 2 as saturated vapor at -20°C. Air enters at state 3 with pressure 1 bar and temperature 295 K and exits at state 4 with pressure 1 bar and temperature 265 K. The flow rate of air is 10 kg/s. Ignore kinetic and potential energy effects, and take the dead state as 1 bar and 300 K. a. Sketch states 1 and 2 on a T-s diagram, including the liquid-vapor dome. b. Describe the heat transfer inside the heat exchanger (what is transferring heat to what?) c. Determine the specific enthalpy of each state, in kJ/kg. d. Determine the mass flow rate of ammonia, in kg/s. e. Determine the rate of exergy destruction within the heat exchanger, in kW. f. Devise and evaluate an exergetic efficiency for the heat exchanger. Donearrow_forward
- Steady-state operating data are shown in the figure for an open feedwater heater.Heat transfer from the feedwater heater to its surroundings occurs at an average outer surfacetemperature of 50°C at a rate of 100 kW. Ignore the effects of motion and gravity and let T 0 =25°C, p0 = 1 bar. Determine(a) the ratio of the incoming mass flow rates, ?̇# /?̇ $ .(b) the rate of exergy destruction, in kW.arrow_forwardI need help with parts 1 through 3 for this problem.arrow_forward4.30 Refrigerant 134a enters a heat exchanger operating ai steady state as a superheated vapour at 10 bars. 60°C. where it is cooled and condensed to saturated liquid at 10 bars. The mass flow rate of the refrigerant is 10 kg/min. A separate stream of air enters the heat exchanger at 37°C with a mass flow rate of 80 kg/min. Ignoring heat transfer from the outside of the heat exchanger and neglecting kinetic and potential energy effects, determine the exit air temperature, in °C.arrow_forward
- A small nuclear reactor is cooled by passing liquid sodium liquid sodium out of the reactor at 2 bar and 400 ° C. It is cooled to 320 ° C by passing through a heat exchanger before returning to the reactor. In the heat exchanger heat is transferred from the sodium to the water, which enters the exchanger at 100 bar and 49 ° C and exits at the same pressure as saturated steam. The mass flow of sodium is 10,000 kg / h, its specific heat is constant and is 1.25 kJ / kg "C and the pressure drop is negligible. Determine (a) the mass flow in kg / h of evaporated water. in the heat exchanger. and (b) the heat flux transferred between the two fluids in kJ / h Neglect the variations of kinetic and potential energy through it.arrow_forwardT-7arrow_forward* 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 °Rarrow_forward
- Solve energy balance problems for common steady-flow devices such as nozzles, compressors, turbines, throttling valves, mixing chambers, and heat exchangers.arrow_forwardthermodynamics problemarrow_forwardI need some help in how to solve this problem. Any help will be appreciated. Thanksarrow_forward
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