Thermodynamics Mech3001 - Week 8 - Problem 1 (9.32) - Part 1 Introduction

9-32 An ideal Otto cycle with air as the working fluid has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 750 kJ/kg of heat is transferred to air during the constant volume heat addition process. Taking into account the variation of specific heats with temperature, determine,
a) the pressure and temperature at the end of the heat addition process
b) the net work output,
c) the thermal efficiency, and
d) the mean effective pressure for the cycle

Answer: a) 3898 kPa, b) 392.4 kJ/kg, c) 52.3%, d) 495.0 kPa

[nawafalshuraya]

how did you solve for V1, you dont have the mass, and its an gas cycle so its not in the tables

[TheSakuraAnime]

How can you solve a. without using the table if it's possible?

[musarapio_hha]

i have a question how to find the 750 kj/kg, of heat added also know as Qin- or Qadd, where it comes from? theres some chart for that?

[mathildaairlines]

can i ask for a help?1. An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of
2. At the beginning of the compression process, air is at 95 kPa and 27°C.
Accounting for the variation of specific heats with temperature, determine (a)
the temperature after the heat-addition process, (b) the thermal efficiency, and
(c) the mean effective pressure.

[amanknowledgehub]

can you please create a complete playlist on otto and diesel cycle numericals from Thermodynamics An Engineering Approach Yunus A. Cengel & Michael A. Boles 7th Edition, McGraw-Hill Companies, ?