Question 11 1 pts Air enters an insulated turbine operating at steady state at 500 kPa,...
Air enters an insulated turbine operating at steady state at 8.0bar, 687 °C and exits at 1 bar, 327 °C. Neglecting kinetic and potential energy changes and assuming the ideal gas model, determine (a) the work developed, in kJ per kg of air flowing through the turbine. kJ/kg (b) whether the expansion is internally reversible, irreversible, or impossible. The expansion is impossible irreversible reversible the tolerance is +/-2%
Is this process possible and why? 73 Air at 500 kPa, 980 K enters a turbine operating at steady state and exits at 200 kPa, 680 K. Heat transfer from the turbine occurs at an average outer surface temperature of 320 K at the rate of 40 kJ per kg of air flowing. Kinetic and potential energy effects are negligible. For air as an ideal gas with c, 1.5 kJ/kg K, determine (a) the rate power is developed in kJ...
Air, modeled as an ideal gas, enters a turbine operating at steady state at 450 kPa, 800 K and exits at 100 kPa. The temperature of the exiting air is 420 K. a) If the turbine is well insulated and you can ignore kinetic and potential energy effects, determine if the exit temperature can be correct. b) What if the exit temperature is 550 K? Explain you’re your reasoning. Hint: Find the entropy generation rate first.
Air enters the compressor of a gas-turbine engine at 51 kg/min at 128 kPa and 316 K and exits at 722 kPa and 555 K. Heat is lost from the compressor at 13 kJ/kg. Determine the power input (in kW to 1 decimal place) required assuming that kinetic energy can be neglected. Take the specific heat of air to be 1.05 kJ/kg.K.
Problem 1: (10 pts) Steam enters an insulated turbine operating at steady state at a pressure of 2 MPa and a temperature of 400°C. A liquid-vapor water mixture exits the turbine with a quality of 0.9 and a pressure of 15 kPa. The power output of the turbine is 5 MW. (1) Identify the keywords and state their meaning (2 pts) (2) Determine the mass flow rate of steam required (8 pts)
Air modeled as an ideal gas enters a turbine operating at steady state at 1040 K, 278 kPa and exits at 120 kPa. The mass flow rate is 5.5 kg/s, and the power developed is 1200 kW. Stray heat transfer and kinetic and potential energy effects are negligible. Assuming k = 1.4, determine: (a) the temperature of the air at the turbine exit, in K. (b) the percent isentropic turbine efficiency.
1. 6. An adiabatic, steady state air compressor compresses 10 L/S of air at 120 kPa and 20 C to 1000 kPa and 300 C. Determine: (a) the mass flow rate of the air in kg/s (b) the power required to drive the air compressor, in kW. Air; c 1.018 kJ/kg K, the gas constant R 0.287 kPa.m/kg.K 1 MPa 300°C Compressor 120 kPa 20°C 101/s
pts] An irreversible turbine The air enters the turbine at 60°C an stea e operates steadily with air flowing through it to produce work. d 1 from ththe turbine the 60°C and 175 kPa with a mass flow rate (m) of 2 kg/s. At the from the turbine C and 101 kPa. During this process, 25 kJ/kg of heat is lost Derive the energy equation neglect. a. on governing this device and show which terms you can mine the power...
5) Evaluating Changes in Entropy for an Ideal Gas Air enters a turbine at 427 °C and 1 MPa and exits at 127 °C. The outlet pressure can be tuned by the operator in the range from 300 - 800 kPa. Determine the change in specific entropy of the air, se -si, as it flows through this turbine 3 ways a) Assuming constant specific heats. b) Integrating an appropriate formula from Table A-2(c) from the text, which gives a polynomial...
I need your help solving this thermodynamics problem please: Question Completion Status: QUESTION 1 20 points Save Ans The heat-pump system shown is designed to provide water-heating and space-cooling. The system includes a heat exchanger to subcool the R134a refrigerant at the outlet of the water heater while heating the refrigerant at the outlet of the evaporator. Given the following data, determine the enthalpy at each station, 1 through 6, using the R134a property tables (click here). Type your answers...