Question

An insulated turbine with an isentropic efficiency of 95% has expanded air initially at 2600 kPa and 500°C to a pressure of 250 kPa. The flow is considered steady, and the kinetic and potential energy changes are negligible. Air is assumed to be an ideal gas with constant specific heats, with Cp = 1.013 kJ/kg·°C, k = 1.395, and R = 0.287 kJ/kg·K. Determine: (i) The air outlet temperature, (ii) The output work delivered by this turbine, and (iii) The entropy generation during this expansion process.

Name: an insulated turbine with an isentropic efficiency of 95 has expanded air initially at 2600 kpa and 500c to a pressure of 250 kpa the flow is considered steady and the kinetic and potential 69058
Uploaded: 2021-12-07T17:26:30-08:00
Duration: 9 min 18 s
Channel: Saman Zulfiqar
Description: an insulated turbine with an isentropic efficiency of 95 has expanded air initially at 2600 kpa and 500c to a pressure of 250 kpa the flow is considered steady and the kinetic and potential 69058

          An insulated turbine with an isentropic efficiency of 95% has expanded air initially at 2600 kPa and 500°C to a pressure of 250 kPa. The flow is considered steady, and the kinetic and potential energy changes are negligible. Air is assumed to be an ideal gas with constant specific heats, with Cp = 1.013 kJ/kg·°C, k = 1.395, and R = 0.287 kJ/kg·K.

Determine:
(i) The air outlet temperature,
(ii) The output work delivered by this turbine, and
(iii) The entropy generation during this expansion process.

Added by Andr-S R.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Saman Zulfiqar

12/07/2021

Step 1

To find the ideal outlet temperature, we can use the isentropic relation for an ideal gas: T2s/T1 = (P2/P1)^((k-1)/k) where T1 = 500°C + 273.15 = 773.15 K (converting temperature to Kelvin), P1 = 2600 kPa, P2 = 250 kPa, k = 1.395. T2s = T1 * Show more…

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An insulated turbine with an isentropic efficiency of 95% has expanded air initially at 2600 kPa and 500°C to a pressure of 250 kPa. The flow is considered steady, and the kinetic and potential energy changes are negligible. Air is assumed to be an ideal gas with constant specific heats, with Cp = 1.013 kJ/kg·°C, k = 1.395, and R = 0.287 kJ/kg·K. Determine: (i) The air outlet temperature, (ii) The output work delivered by this turbine, and (iii) The entropy generation during this expansion process.