Free Essay

Homework Essay

In:

Submitted By case380
Words 463
Pages 2
ME 432: Applied Thermodynamics Assignment 1 1. A steam turbine operates at steady state with inlet conditions of P1 = 5 bar, T1 = 320 o C. Steam leaves the turbine at P2 = 1 bar and T1 = 180 o C. There is no significant heat transfer between the turbine and its surroundings, and kinetic and potential energy changes between inlet and exit are negligible. a. Calculate power output (per unit mass of steam flowing) of the turbine. b. Calculate the isentropic efficiency of the turbine (ηs ) and show the states on h-s diagram. c. Calculate the second law efficiency of the turbine (η2 ). 2. Consider a compressor with inlet conditions of P1 = 3.5 bar, T1 = −5 o C and exit conditions of P2 = 14 bar, T2 = 75 o C. The working fluid is refrigerant 22 with a mass flow rate of m = 0.07 kg/s. ˙ a. Calculate compressor power. b. Calculate the isentropic efficiency of the compressor (ηs ) and show the states on h-s diagram. c. Calculate the second law efficiency of the compressor (η2 ). 3. Compressed air enters a counterflow heat exchanger operating at steady state at P1 = 10 bar, T1 = 610 K and exits at P2 = 9.7 bar, T2 = 860 K. Hot combustion gas enters as a separate stream at P3 = 1.1 bar, T3 = 1020 K and exits at P4 = 1 bar. Each stream has a mass flow rate of 90 kg/s. Heat transfer between the outer surface of the heat exchanger and the surroundings can be ignored. The effects of motion and gravity are negligible. Assuming the combustion gas stream has the properties of air, and using the ideal gas model for both streams, determine for the heat exchanger

a. the exit temperature of the combustion gas (T4 ). b. the net change in the flow exergy rate from inlet to exit of each stream, in M W . c. the rate exergy is destroyed, in M W . d. the second law efficiency of the heat exchanger (η2 ). Let Po = 1 bar, To = 300 K 4. An open feedwater heater shown in figure below operating at steady state with liquid entering at inlet 1 with P1 = 7 bar, T1 = 40 o C. Water vapor at P2 = 7 bar, T2 = 200 o C enters at inlet 2. Saturated liquid water exits at 3. Ignoring the heat transfer with the surroundings and the effects of motion and gravity, determine a. the ratio of mass flow rates, m1 /m2 . ˙ ˙ b. the rate of exergy destruction, in kJ per kg of liquid exiting. c. the second law efficiency of the heat exchanger (η2 ). Let Po = 1 atm, To = 25 o C

Liquid water o 40 C, 7 bar

1

2 Water vapor 200oC, 7 bar

3 Saturated liquid 7 bar

Similar Documents

Premium Essay

Why We Should Homework Be Required Essay

...Since Roberto Nevilis introduced it to the world as a punishment in 1905, there have been many arguments to whether or not homework should be required. What initially started as punishment for kids who messed around in class has become a mandatory task that all students are required to do daily. I’m here to end that, I intend to show you that students should not be required to complete homework for a grade. Homework consumes too much time and leaves no space for extracurricular activities and causes health problems. On top of that, many students don’t even have the resources required to complete the homework. Despite these things, homework is still a graded assignment that if failed to complete, can drastically bring down a student's grade. Consider the fact that the American standards for homework is much lower than anywhere else in the world. CNN conducted a study that showed that on average, in America students receive three times more homework than the recommended amount. 56% of students said that homework is a primary source of stress and frustration. Stress causes a vicious cycle. It can lead to heart diseases, depression, exhaustion, and pain, which in turn lead to more stress....

Words: 743 - Pages: 3

Free Essay

Apology Admission of Ignorance

...“I thought to myself: I am wiser than this man; neither of us probably knows anything that is really good, but he thinks he has knowledge, when he has not, while I, having no knowledge, do not think I have.” ― Plato, Apology tags: apology, knowledge, plato, socrates, wisdom 23 people liked it like “Men of Athens, I honor and love you; but I shall obey God rather than you, and while I have life and strength I shall never cease from the practice and teaching of philosophy... Understand that I shall never alter my ways, not even if I have to die many tim Apology: Top Ten Quotes Top Ten Quotes | 1) "I am very conscious that I am not wise at all," (Socrates)2) "in my investigation in the service of the god I found that those who had the highest reputation were nearly the most deficient, while those who were thought to be inferior were more knowledgeable." (Socrates)3) "Either I do not corrupt the young or, if I do, it is unwillingly," (Socrates)4) "You are wrong, sir, if you think that a man who is any good at all should take into account the risk of life or death; he should look to this only in his actions, whether what he does is right or wrong, whether he is acting like a good or a bad man." (Socrates)5) "To fear death, gentlemen, is no other than to think oneself wise when one is not, to think one knows what one does not know." (Socrates)6) "I will not yield to any man contrary to what is right, for fear of death, even if I should die at once for not yielding." (Socrates)7)...

Words: 1604 - Pages: 7

Free Essay

Narrative Essay

...Summer break had just ended. Where did the time go? Well it back to the books I said to myself I wonder what’s in store for me this year. I could hardly believe it’s my final year in school. Like my teachers would say “getting ready for the real world.” When I returned to school, I was so excited to see all of my friends, we hugged, we talked about summer vacations and then the bell rang from homeroom. I was in Mr. Henry’s homeroom, I was glad; he is cool one of the coolest teachers. Announcements came on and then it was off to Convocation. Mrs. Knowles addressed the entire school and then turned her attention to the seniors, she reminded us about the seriousness of this year and how at some point during the year we may have to make decisions that can affect our life forever! I am sitting thinking to myself “what kind of decision will have to make that will affect my life? I have a mother who makes those decisions for me.” The following day classes were in full swing, and the work load was heavy, but it was nothing I couldn’t handle. I had settled down a whole lot and my last report card was a reflection of it, it was the best report that I had gotten in years. And oh boy wasn’t my mother proud! The school year was going by so quickly before I could blink my eye we were taking year book pictures, getting measured for cap and grown and the deadlines or course work was almost here. I remember this particular morning, I arrived at school and just as I came out of the car. Kwame...

Words: 1164 - Pages: 5

Free Essay

Students

...usually called the jocks, the nerds, and the normal people. The reason for this essay is to clear up some concepts regarding the three types of college students. One group, The Jocks, is the show-off type of people who puts off their homework assignments until the last minute. Once the assignment is completed at the last minute, the assignment is usually scored a low grade. The reason for this is because the jocks are always partying, going out on dates, or having fun with their sorority. The jocks wear anything to include torn jeans/shirts, work down sneakers or boots and cheap, expensive-looking jacket. The second group, known campus-wide, is the nerds because they are obsessed with books, constantly studying and learning about their interests. The nerds are usually annoying with their obnoxious laughter regarding a really stupid joke. The nerds wear a nice shirt with a bow tie, or a tie and a nicely ironed dress pants and always has a pocket protector to prevent ink stains from their pens. The nerd spends their school night with a tight schedule for recreation, school homework, and learning new things that captures their interests. Computer programming, calculator programming, the biology of their pet frog are some of the common things that interests the nerds. The third group is the normal group, they are usually typical college students attending their scheduled classes, getting the homework assignments done and turned in on time. The normal group is usually mothers/fathers...

Words: 463 - Pages: 2

Free Essay

The Results for the Vark Assessment

... The VARK Questionnaire Results: The Writer’s scores were: •Visual: 4 •Aural: 7 •Read/Write: 12 •Kinesthetic: 3 This essay is about this essay’s writer’s learning style, strategies, and the VARK learning strategy guide. This essay will go into depth with the writer, ways a person can improve their learning strategies, their learning styles, and other learning style. The writer thinks it is important that learning styles is thought about often, because it could help you with tests, essays, and homework assignments. It helps to know a person’s strong points, and know to strengthen your weaker points, so a person can pinpoint ways to help them flourish in their studies. The learning style mainly used by the writer are reading and writing. This helps when there is a hard homework assignment or essay comes up and when the writer is unsure on what to do. The writer starts by reading the material that was given to the writer of this essay. Having a reading and writing learning style helps improve writing, because this writer sometimes rewrites things to get a better grasp on it. The writer also proofreads her work to see if there are any mistakes in spelling, grammar, or punctuation. The learning strategies the writer uses involves reviewing things by writing things out, rereading material that either was homework, or given to help with the...

Words: 928 - Pages: 4

Free Essay

Accounting

...CALIFORNIA STATE POLYTECHNIC UNIVERSITY, POMONA ACC 311 Intermediate Accounting I SPRING 2016 PROFESSOR: Dr. Hassan Hefzi OFFICE: 164-2085 OFFICE HOURS: 12:30 - 2:00 MW PHONE: (909) 869-2385 And by appointment E-mail: hhefzi@cpp.edu (I do not respond to e-mails on weekends) Text and other Materials: 1. Intermediate Accounting, Spiceland, Sepe and Nelson, 8th Ed., McGraw-Hill, 2016. 2. The Wall Street Journal, or the Journal of Accountancy. 3. FASB, Concept Statements No5, 6, 7 & 8). At http://www.fasb.org. Course Description: Analytical study and application of accounting theories and techniques including current literature of authoritative accounting organizations. 4 lecture/problem solving. Prerequisite: A minimum grade of “C” (2.0) in ACC 304 and a passing grade on the Graduation Writing Test. Non-accounting majors should refer to the current Cal Poly Pomona Catalog. Course Objectives: This course is aimed primarily towards those who will be providers of financial information for external use—those who will be primarily responsible for observing, selecting, measuring, and reporting financial information for external decision making. The main objective is to develop skills of APPLICATION AND ANALYSIS, i.e., to demonstrate the use of appropriate concepts, standards, and techniques after having considered the needs of financial statement users and how the behavior of the users may be influenced by financial accounting information...

Words: 1881 - Pages: 8

Premium Essay

Blaaaaaaah

...Free Essays 1 - 20 www.studymode.com/.../meaning-of-study-ha... - Isalin ang pahinang ito 20+ (na) item – Free Essays on Meaning Of Study Habits for students. Study Habits Discuss The Attributes/Skills/Actions (For Example; Study Habits, Personal ... What is the definition of study habits? _education_childhood,college ... godplz.com/?internationalstudiesdefinitionkan... - Isalin ang pahinang ito 1 Dec 2011 – A HABIT is something that is done on a scheduled, regular and planned basis that is not relegated to a seccond place or optional place in one's ... Meaning of study habits wiki.answers.com › ... › Learning Theories - Isalin ang pahinang ito Relevant answers: What is the meaning of good study habits? good study habits is simply studying good. What is study habits? == Answer ==. The manner with ... What is the Definition of study habit wiki.answers.com/.../What_is_the_Definition_... - Isalin ang pahinang ito It means you are not distracted by anything, you have a certain place to go where it is quiet everyday where you study and do homework. Basically it means that ... What are study habits wiki.answers.com › ... › Education › Learning Tips - Isalin ang pahinang ito Study habits are the ways that you study - the habits that you have formed during ... It means you are not distracted by anything, you have a certain place to go ... ...

Words: 389 - Pages: 2

Free Essay

Study Plan

...4:00 a.m. -1:00 p.m.-Full time job 1:00 p.m. -2:00 p.m.-Run any errands needed 2:00 p.m.-3:30 p.m.- Begin reading assignments, working on essays, discussions and study 3:30 p.m.-4:00 p.m. - Pick my daughter up from school 4:00 p.m.-6:00 p.m. - Help daughter with homework and study 6:00 p.m.- 8:00 p.m.- Complete assignments/assessments that are due 8:00 p.m.-8:30 p.m. - Eat dinner, get shower and tuck my daughter into bed. 8:30 p.m.-10:30 p.m.-Finish up any studying that was not finished for the day 10:30 p.m.-Bedtime Tuesday 4:00 a.m. -1:00 p.m.-Full time job 1:00 p.m. -2:00 p.m.-Run any errands needed 2:00 p.m.-3:30 p.m.- Begin reading assignments, working on essays, discussions and study 3:30 p.m.-4:00 p.m. - Pick my daughter up from school 4:00 p.m.-6:00 p.m. - Help daughter with homework and study 6:00 p.m.- 8:00 p.m.- Complete assignments/assessments that are due 8:00 p.m.-8:30 p.m. - Eat dinner, get shower and tuck my daughter into bed. 8:30 p.m.-10:30 p.m.-Finish up any studying that was not finished for the day 10:30 p.m.-Bedtime Wednesday 8:00 a.m. -5:00 p.m.-Full time job 1:00 p.m. -2:00 p.m.-Run any errands needed 2:00 p.m.-3:30 p.m.- Begin reading assignments, working on essays, discussions and study 3:30 p.m.-4:00 p.m. - Pick my daughter up from school 4:00 p.m.-6:00 p.m. - Help daughter with homework and study 6:00 p.m.- 8:00 p.m.- Complete assignments/assessments that are due 8:00 p.m.-8:30 p.m. - Eat dinner, get shower and tuck my...

Words: 787 - Pages: 4

Premium Essay

Cause and Effect Procrastination

...I was busy. Busy enough to always keep myself away from my homework, busy checking my Facebook status, poking my friends, writing comments trying to embarrass Kevin, a friend of mine, and playing Warcraft. “I’m just taking a break.” I said to myself, as though I don’t know I’m lying to myself, or I actually did a bit of work. “New message from Felix!” a message pops out on my Facebook page. Felix: “Warcraft?” Me: “Heck yeah!” I turned away from my English homework which I’ve been staring at for the past five minutes, and got myself lost in the world of dota (Defense of the Ancient). I knew all along that I was procrastinating. I steer myself into anything else rather than homework, and after hours of dipping myself into games, I’ll eventually totally forget about what I was supposed to do. I perfectly know that if this essay was not due tomorrow, I wouldn’t be writing it right now. As my mind is still here, I wonder how poor homework completion due to procrastination can take its toll on me. The first thing my laziness hits directly is my grade. I got a big fat B for my English, or it might get even worse than B, which is not what I expected -or what I wanted. I have the embarrassment among my family that I haven’t been delivering the great things they expected from me. And all through my life, I will only have one set of family and one set of parents. How can I go back and try my life again? How can I do a “do over”? When I was a boy, we played games in...

Words: 1011 - Pages: 5

Free Essay

My Favorite Place on Campus

...Mr. Stephens Essay 1 September 9, 2013 My Favorite Place on Campus As I sit under the pavilion, I begin to recognize and appreciate how relaxing and refreshing the atmosphere around me truly is. Whether your purpose is to study, have fun or relax, the pavilion is the perfect place to do it. Many students agree that the best place on campus to study is under the pavilion. Other students say that they have had the most memorable experiences of their lives there. One of my absolute favorite places to study and do homework is underneath the pavilion. There, students will find themselves feeling peaceful and tranquil. When the birds and crickets chirp there is a soft and calming noise that echoes throughout the pavilion making one feel relaxed and serene. At times, studying can be extremely stressful, but with the wind blowing just right and the sounds of nature buzzing in my ear, I feel a sudden sense of peace. Focusing on schoolwork for long periods of time is a challenge for some students, but being under the pavilion helps most students unwind and focus on your goals. Students come to the pavilion on a regular basis, whether to play games or to simply have a conversation. It is a great place to gather with other people and to get to know fellow classmates a little bit better. Many of the relationships that form around OC will last a lifetime, and I can personally say that many of these connections and memories originate from under the pavilion’s roof. Some...

Words: 470 - Pages: 2

Free Essay

Ethics & Human Values

...Ethics and Human Values Materials for This Course Available in the Bookstore J. S. Mill Utilitarianism (Hackett) Immanuel Kant Grounding for the Metaphysics of Morals (Hackett) Aristotle Nicomachean Ethics (Chicago) These are all relatively inexpensive paperbacks. So acquire them immediately. There will also be a few brief handouts. Course Description The subject of ethics is the pursuit of the good. For animals, the good is given in instinct; however, with the advent of reason we have the capacity of the human being to choose that which is not given by nature. This means that it is unclear that our immediate impulses guide us correctly; there must be a standard to be argued for, since the immediately given is not satisfactory. It is in ethical reality that the degree of difference of intelligence between man and the animals is perhaps equivalent to a difference in kind. Because of this, the human good, as opposed to the natural good, is inherently questionable. In this class, we will be looking at how it is that philosophers have concerned themselves with this question. We will look at 3 of major different ways in which the question the ultimate ethical principle has been understood; the utilitarian, the “deontological” and the “eudaimonistic”, by considering a few of the primary texts that deal with these. Requirements, Expectations, Grading You are expected to attend and attentively participate in every class period. The grade...

Words: 2062 - Pages: 9

Premium Essay

The Differences in Education Between China and America

...education between China and America ways of studying was learning, and using different languages. First, there is a different way to study between China and America. In China, students study very hard every day because they have lots of homework. However, there is not much homework in the America. Chinese's teacher thinks homework is the good way to studying, but American student doesn’t have lots of homework. Chinese's teacher always gives a student some question out of the book because this is good for the GAO KAO exam. Chinese's student buy textbook each year, and it is cost more money. In America, the teacher wants to the student read book, and never give the student much homework. If you finish the lesson’s homework, it would be enough for exam. If you read the book, you will be easy past the exam. American teacher also don’t give extra homework because they know it is enough lesson for the student today. If Chinese student wants to be successful at an American college, they should study hard and read the book well. Second, there are two difference ways to learning between China and America. Chinese's teacher would like letting the student remember all of things in the book, and practice multiple-choice and the essay questions until students can remember these questions. In fact, it helps for doing the exam. In the America, the...

Words: 608 - Pages: 3

Free Essay

Character Traits of a Good Student

...Mackenzie Blake 9/20/12 Essay 1 CHARACTER TRAITS OF A GOOD STUDENT There are many character traits of a good student. A few are: study habits, not procrastinating, and taking notes. If a student takes these traits and applies them to his student life they will benefit him and make him a good student. Good study habits are very important in a student’s life. There are a lot of ways a student can study. Making note cards or studying over class notes, taken during the week are very good ways to study for an upcoming test or quiz. Also studying away from the television, computer, cell phone, and other distracting things is a good way to study. Procrastinating is a very serious thing that every student should avoid to become a better student. Going ahead of time and getting assignments done is a good way to avoid procrastinating. Another way to avoided procrastinating is to start on your homework and studying as soon as you get home from school. Also taking advantage of study halls and other short breaks to get ahead on assignments is another great way to avoided procrastinating. Taking good notes is a very important thing to do to become a good student. Listening in class and writing notes off the board is a very good way to get good notes. Making sure your notebook is neat an ordered is another important thing to have done to be able to look back and understand what was said in class. Asking another student for notes missed on an absent day is a very good way to have great...

Words: 321 - Pages: 2

Premium Essay

Homework Assignment 1

...Homework Assignment 1 Natasha Dodson Allied American University Author Note This paper was prepared for [ENG 160], [HOMEWORK ASSIGNMENT 1] taught by [MARC THOMPSON]. Essay Writing: Part 1 PART I I. Introduction II. Body A. Traveling 1. Luggage 2. People 3. Airlines B. Vendors 1. Restaurants 2. Souvenir Shops 3. Massage and Relaxation C. Security Measures 1. Police 2. Transportation Security Administration and Homeland Security 3. Random baggage checks III. Conclusion PART II 1. What is the thesis of Johnson’s essay? If it is stated directly, locate the relevant sentence or sentences. If it is implied, state the thesis in your own words. In my opinion the thesis of Lou’s Place is implied. It does imply that Lou and his customers have an unspoken bond and fondness for one another, even though they belittle each other and the customer pays to pour their own coffee. Lou’s Place is not that place where the service is perfect or the conversation is polite. It is that place where you can be yourself; cook your own eggs and where service is not at all prompt. It is almost as if you are at home with family and friends. You will be criticized before you even find a complement. 2. Which statement would best serve as a topic sentence for paragraph 13? Explain why. I think the best topic sentence for paragraph 13 would be “Regular customers at Lou’s are used to...

Words: 870 - Pages: 4

Free Essay

Research Paper

...Bobby Daniels October 14, 2015 Essay The type of learner that I’m is passive learner. I would start working on my homework for a little while. Then I would stop doing my work for a hour or thirty minutes. Sometimes I can probably just give up on what I am doing. If I don’t understand school work, insurance paperwork, car payments information, etc. Active Learning is problem solving that promote analysis and evaluation of class content. Passive Learning is learning without a direct attempt. My first active learning strategy is to give students a list of key points to watch for each chapter that we go over in class. Because when we have that information, we can be better prepared for what to expect for a quiz or the final exam. When studying this information on our own time. We can remember information from each section of our textbook. When we a classroom discussion on each chapter, we can have answer to any question that is giving out by the teacher in class. The next strategy is for us as students to read different parts of a chapter of own choosing. I think that is better to do this during a class session. Where we can ask the teacher about the chapter that we read. Another option would be for to ask classmates what are their opinion or answers to the chapter. I believe that is the best active learning strategy to try in class or at home with family members. The final strategy involves making...

Words: 417 - Pages: 2