Determine the rate of entropy production

Assignment Help Mechanical Engineering

Reference no: EM131015324

Air enters a turbine operating at steady state with a pressure of 75 lbf/in.2, a temperature of 800°R, and a velocity of 400 ft/s. At the turbine exit, the conditions are 15 lbf/in.2,600°R, and 100 ft/s. Heat transfer from the turbine to its surroundings takes place at a location where the average surface temperature is 620°R. The rate of heat transfer is 10 Btu per lb of air passing through the turbine.

(a) For a control volume including only the turbine and its contents, determine the work developed, in Btu, and the rate at which entropy is produced, in Btu/°R, each per lb of air flowing.

(b) For a control volume including the turbine and a portion of its immediate surroundings so that the heat transfer occurs at the ambient temperature, 40°F, determine the rate of entropy production in Btu/ °R per lb of air passing through the turbine. Explain why the entropy production value of part (b) differs from that calculated in part (a).

Reference no: EM131015324

Questions Cloud

Construct a risk-free portfolio : Additionally, you know that the current stock prices are X(0) = 24 and Y (0) = 48. You wish to construct a risk-free portfolio that consists of 100 shares of X, N shares of Y , and investing B dollars at the risk-free rate. The cost of the portfol..

Monthly payment and the ending loan balance : If the loan will be repaid after 3 years, what would be the monthly payment and the ending loan balance for each of the three years? What is the effective mortgage yield for borrowing this mortgage?

Do an internet search on age discrimination : Do an Internet search on age discrimination. Choose three sites that each deal with a different aspect of age discrimination (for example: discrimination in high tech industries, preventing discrimination, AARP's involvement with the issue, etc.)

Determine if the irr for system a : Based on the result of 3) which is the better investment? Determine if the IRR for System A is higher than 15%.

Determine the rate of entropy production : For a control volume including the turbine and a portion of its immediate surroundings so that the heat transfer occurs at the ambient temperature, 40°F, determine the rate of entropy production in Btu/ °R per lb of air passing through the turbine..

Evaluate the maximum theoretical power : The figure provides data for steady-state operation. All surfaces are well insulated except for the one at 527°C, through which heat transfer occurs at a rate of 4.21 kW. Ignoring changes in kinetic and potential energy, evaluate the maximum theor..

What is the difference between a dnp and a phd in nursing : What is the difference between a DNP and a PhD in nursing? Which of these would you choose to pursue if you decide to continue your education to the doctoral level?

Determine the direction of flow and the power in kw : Figure provides steady-state operating data for a well-insulated device with air entering at one location and exiting at another with a mass flow rate of 10 kg/s. Assuming ideal gas behavior and negligible potential energy effects, determine (a) t..

Transport students to and from school events : A private school is considering the purchase of six school buses to transport students to and from school events. The initial cost of the buses is $600,000. The life of each bus is estimated to be five years, after which time the vehicles would ha..

User Account

All Pages