The 2nd Law of Thermodynamics Refrigerant-134a enters a diffuser steadily as saturated vapor 500 kPa with a velocity of 170 m/s, and it leavesat 600 kPa and 50◦C. the refrigerant is gaining heat at a rate of 2.5 kJ/s as it passes through the diffuser. Ifthe exit area is 75 percent greater than the inlet area, determine (a) the exit velocity (b) the mass flow rate of the refrigerant.

The 2nd Law of Thermodynamics Refrigerant-134a enters a diffuser steadily as saturated vapor 500 kPa with a velocity of 170 m/s, and it leavesat 600 kPa and 50◦C. the refrigerant is gaining heat at a rate of 2.5 kJ/s as it passes through the diffuser. Ifthe exit area is 75 percent greater than the inlet area, determine (a) the exit velocity (b) the mass flow rate of the refrigerant.

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

See similar textbooks

Similar questions

12 kg of air per minute is delivered by a centrifugal air compressor It enters the compressor at a velocity of 12 m/s with a pressure of 1 bar and specific volume of 0. 5 m²/kg and leaves at a velocity of 90 m/s with a pressure of 8 bar and specific volume of 0.14 m/kg. The increase in enthalpy of air passing through the compressor is (hz-hi = 150 kJ/kg) and heat loos to the surroundings at a rate of 700 kJ/min. Assume the inlet and discharge line are at the same level. Answer the following; a. What are the main assumptions b. Calculate the power required to drive the compressor, in kW c. Calculate the ratio of inlet and outlet pipe diameter? Air out Boundary d2 Centrifugal compressor di Air in
In an adiabatic turbine, this steam flow is 50 kg / s. The power produced by the turbine is 29 MW.Steam enters the turbine with a pressure of 50 bar and a speed of 60 m / s. At the outlet, at a pressure of 0.06 barIt comes out as saturated water with a speed of 130 m / s. Accordingly, the heat lost by the turbine andFind the turbine inlet and outlet temperatures of steam
3. Air enters a gas turbine system with a velocity of 105 m/s and has a specific volume of 0.8mkg. The inlet area of the gas turbine system is 0.05m. At exit the air has a velocity of 135m/s and has a specific volume of L.5 m/kg. In its passage through the rurbine system the specific enthalpy of the air is reduced by 145kj/kg and the air also has heat loss of 27kj kg. Determine 7. 1. The mass flow rate of the air through the turbine system 2 The exit area of the turbine 3. The power developed by the turbine systenm
A nozzle is a device for increasing the velocity of a steadily flowing fluid. At the inlet to a certain nozzle the specific enthalpy of the fluid is 3045 kJ/kg and the velocity is 70 m/s. At the exit from the nozzle specific enthalpy is 2850 kJ/kg. The nozzle is horizontal and there is a negligible heat loss from it. Determine; e. 1. The velocity of the fluid at exit The rate of flow of fluid when the inlet area is 0.1 m? and the specific volume at inlet is 0.19 m/kg. ii. The exit area of the nozzle when the specific volume at the nozzle exit is 0.5 m'/kg. 11.
Water vapor enters the turbine at a steady state of 3 MPa pressure, 400°C temperature and 160 m/s speed. It exits the turbine as saturated steam at 100°C and 100 m/s. When the average surface temperature is 350 K, the heat transfer from the turbine to its surroundings is 30 kJ per kg of steam. a) Determine the work produced in kJ by considering only the turbine and its components as the control volume, and determine the entropy production in kJ/K for each kg steam flow. b) The steam turbine is located in a factory with an ambient temperature of 27°C. Determine the entropy generation in kJ/K for each kg of steam flow, including the turbine and its surroundings, and heat transfer from the control volume to ambient temperature, using the extended control volume approach.
Air (MW=29 g/mol) at 115.00 kPa and 285.00 is compressed steadily to 600.0 kPa. The mass flow rate of the air is 2.00 kg/s and a heat loss of 32.1 kW occurs during the process. You may assume that changes in kinetic and potential energy are negligible, the temperature of the surroundings is 25 ∘C, and that the CP of air is 3.5 R. Given the compressor operates with a second law (reversible) efficiency of 0.60,calculate the following. What is the actual work interaction term in kW? What is the actual exit temperature of the air in Celcius?
Determine the mass flow rate fuel supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 150000W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. The high heating value (HHV) of the fuel is 50.02 MJ/kg. The cost of the fuel based boiler system is $5000 and has a lifetime of 20 years. The fuel cost is $0.10/kg. There is a tax charge of $0.50/kg of CO2 emission that is passed on to the user. The unit is used for 10 hours per day, 280 days per year. Calculate carbon dioxide emission and theroeconomic cost? There is no cost associated with the water input. Note the total amount of fuel consumed is directly related to the carbon dioxide emission from each process.
A garden hose attached with nozzle is used to fill a 25-gallon bucket. The inner diameter of the hose is 1 in. and it reduces to 0.5 in. at the nozzle exit. If the mean velocity in the hose is 8 ft/sec, determine (a) the volume rate gal/min and mass flow rate in lbm/sec of water through the hose, (b) how long it will take to fill the bucket with water, and (c) the mean velocity in ft/sec of water at the nozzle exit.
Air (MW=29 kg/kmol) at 115.00 kPa and 285.00 K is compressed steadily to 600.0 kPaThe mass flow rate of the air is 2.00 kg/s and a heat loss of 32.1 kW occurs during the process. You may assume that changes in kinetic and potential energy are negligible, the temperature of the surroundings is 25 ∘C and that the CP of air is 3.5 R. Given the compressor operates with a second law (reversible) efficiency of 0.60, calculate the following. What is the actual work interaction term? What is the actual exit temperature of the air?
6) Steam enters a turbine at a pressure P-2.0MPA, temperature T1=500°C and enthalpy hi=3062 kJ/kg with a velocity Vi=10 m/s. The steam leaves the turbine as a gas-liquid mixture at a pressure P2=101kPa, temperature T2-373 K, and enthalpy ha=2621 kJ/kg with a velocity of v2-50 m/s. Thermal energy is lost through the turbine walls at a rate of 5 kJ/hr. The elevation difference between the entrance and exit of the turbine can be neglected. Calculate the power output in units of kW if 4000 kg/hr of steam pass through the turbine. %3D 4ニ-13815/5ec Pi thz + 6. 2Xla メSo? 2K9.81 3062 x103 1389 10 + é 621 X1s*) !8א2 ll rel 1o0ox4.21 looo X 9.81 2.
Air at a static temperature and pressure of 8°C and 75 kPa respectively enters the intake of an aircraft gas turbine engine with a velocity of 196 m/s. The intake may be regarded as a diffuser with an inlet area of 0.4 m2 and an exit area that reduces the air flow velocity essentially to zero. Calculate the mass flow rate (kg/s) of air through the intake, given the specific gas (air) constant as 287 J/(kg.K), keeping three decimal places.
Air at a static temperature and pressure of 9°C and 100 kPa respectively enters the intake of an aircraft gas turbine engine with a velocity of 206 m/s. The intake may be regarded as a diffuser with an inlet area of 0.4 m2 and an exit area that reduces the air flow velocity essentially to zero. Calculate the mass flow rate (kg/s) of air through the intake, given the specific gas (air) constant as 287 J/(kg.K)