Learning Materials
Features
Discover
Chapter 21: Q.18 (page 595)
At what pressure ratio tyyuudoes a Brayton cycle using a monatomic gas have an efficiency of 50 ?
rytiu
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
The FIGURE shows the Diesel cycle. It is similar to the Otto cycle (see Problem), but there are two important differences. First, the fuel is not admitted until the air is fully compressed at point . Because of the high temperature at the end of adiabatic compression, the fuel begins to burn spontaneously. (There are no spark plugs in a diesel engine!) Second, combustion takes place more slowly, with fuel continuing to be injected. This makes the ignition stage a constant-pressure process. The cycle shown, for one cylinder of a diesel engine, has a displacement localid="1650278379201" of localid="1650278390412" and a compression ratio localid="1650278397535" These are typical values for a diesel truck. The engine operates with intake air localid="1650278425123" at localid="1650278430754" and localid="1650278435051" pressure. The quantity of fuel injected into the cylinder has a heat of combustion of localid="1650278440305" .
. Find , , and at each of the four corners of the cycle. Display your results in a table.
. What is the network done by the cylinder during one full cycle?
. What is the thermal efficiency of this engine?
. What is the power output in kW and horsepower of an eight-cylinder diesel engine running at ?
The power output of a car engine running at is . How much (a) work is done and (b) heat is exhausted per cycle if the engine's thermal efficiency is ? Give your answers in.
A heat engine extracts of heat from the hot reservoir each cycle and exhausts of heat. What are (a) the thermal efficiency and (b) the work done per cycle?
A -efficient electric power plant produces of electric power and discharges waste heat into ocean water. Suppose the waste heat could be used to heat homes during the winter instead of being discharged into the ocean. A typical American house requires an average of for heating. How many homes could be heated with the waste heat of this one power plant?
A heat engine uses a diatomic gas that follows the cycle in FIGURE P.
a. Determine the pressure, volume, and temperature at point
b. Determine , and
for each of the three processes. Put your results in a FIGURE Ptable for easy reading.
c. How much work does this engine do per cycle and what is its thermal efficiency?
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App