Analysis Of A Vapor Power Plant :: essays research papers

Analysis of A Vapor Power Plant The objective of this study is to construct a computer model of a water vapor power plant. This model will be used to calculate the state properties at all points within the cycle. Included is an analysis of the ideal extraction pressures based on the calculated values of net work, energy input, thermal efficiency, moisture content, and effectiveness. 4.0 Body 4.1 Introduction System to be Analyzed Steam enters the first turbine stage at 120 bar, 520  °C and expands in three stages to the condenser pressure of .06 bar. Between the first and second stage, some steam is diverted to a closed feedwater heater at P1, with saturated liquid condensate being pumped ahead into the boiler feedwater line. The Terminal Temperature Difference of the feedwater heater is 5 °C. The rest of the steam is reheated to 500 °C, and then enters the second stage of expansion. Part of the steam is extracted between the second and third stages at P2 and fed into an open feedwater heater operating at that pressure. Saturated liquid at P2 leaves the open feedwater heater. The efficiencies of all pumps are 80%, and the efficiencies of all turbines are 85%. Throughout this report the states will be referenced as depicted above with the numbers 1-13. The analysis of the system will involve the use of the Energy Rate Balance to isolate the specific enthalpies and associated values of temperature, pressure, specific volume, and steam quality. The Entropy balance equation will be used to calculate the specific entropy at all the above noted states. Energy Rate Balance (assume KE&PE=0) dEcv/dt = Qcv-Wcv+Smi(hi) - Sme(he) Entropy Rate Balance dScv/dt = SQj/Tj + Smi(si) - Sme(se) + scv For simplicity, it is assumed in all calculations that kinetic and potential energy have a negligible effect. It is also assumed that each component in the cycle is analyzed as a control volume at steady state; and that each control volume suffers from no stray heat transfer from any component to its surroundings. The steam quality at the turbine exits will also be constrained to values greater than or equal to 90% (Moran, 337). 4.2 Code Development The C program "finalproject.c ² was developed to calculate the state values given the constraints listed in section 4.1. The program structure consists of three parts: Header/variable declaration Calculation section Data Report section The Header section includes all the variable declarations, functions to include and system definitions. To obtain accurate data values, this program uses floating point values. The Calculation section is the function that is used to calculate all the state values. In essence this section consists of two nested while()

Ap Chemistry Redox Titration Lab

Redox Titration Lab ABSTRACT: In this lab, 0. 010 M purple-colored potassium permanganate solution was standardized by redox titration with iron (II) ammonium sulfate hexahydrate (FAS). The average mass of the three flasks of FAS was 0. 483 grams. Once the concentration of the standard solution of KMnO4 (aq) was determined, it was used to determine the concentration of Fe2+ in iron pills. On average, there was 0. 01813 L of solution used.With this information and the balanced net-ionic equation 10Fe(NH4)2(SO4)2*6H2O+2KMnO4+H2SO4 –> 5Fe2(SO4)3+(NH4)2SO4+K2SO4+2MnSO4+H2O, the average percentage by mass composition of Fe2+ in iron pill samples was 16. 99%. (103) INTRODUCTION: The scientific concept of this lab was to titrate potassium permanganate with iron (II) ammonium sulfate hexahydrate in order to oxidize the Fe2+ to Fe3+. Then the concentration of the standard solution of KMnO4 (aq) will be used to determine the concentration of Fe2+ in iron pills. The purpose of the lab is to first standardize a stock KMnO4 (aq), and then determine the percentage Fe2+ in iron pills. Read this Practice Test Chem 105The expected outcome of this lab was for the percentage of Fe2+ in the iron pills to be 17%. This is what was on the bottle of iron pills, and the point of the lab was to use titration to retrieve as much if the iron as possible. MATERIALS AND METHODS: The procedure for the standardization of KMnO4 (aq) was to first fill a clean 50 mL buret with 0. 0100 M KMnO4 (aq). Three clean Erlenmeyer flasks needed to be labeled, and a piece of FAS needed to be weighed to 0. 5g on a piece of weighing paper. Flask 1 was tarred and tapped into the FAS. The mass was then recorded. This was then repeated with flask 2 and 3. 0 mL of water and 5 mL of 3M H2SO4 was added to the three flasks. 50 mL of water was put in a beaker and 1 drop of permanganate solution was added. The color intensity of the mixture matched the standard and remained for 5 seconds or more. The initial volume was recorded to 0. 01 mL. Permanganate was then added to the FAS solution in flask 1 until the equivalent point was reached. The final volume was recorded and the permanganate solution used was determined. The titration process was repeated using FAS in flask 2 and 3. The flasks were then washed down the drain and rinsed with distilled water.Moles of Fe2+ ions present was calculated from the mass of FAS. The balanced equation was used to find the moles of KMnO4 needed to reach the same point. The three molarities of the permanganate solutions were then calculated. The molarities were added to the class data which would calculate the overall molarity for permanganate solutions. The procedure for the analysis of the iron pill was to first grind 2 iron pills in a mortar and pistol. There was 63 mg of iron per pill. 0. 3 grams was weighed on weighing paper, and an Erlenmeyer flask was tarred. The powder was then put in the flask and massed to 0. 01 g. This was then repeated with the second sample. 25 mL water, 15 mL 3M H2SO4, and a few drops of H3PO4(aq) was added to each fla sk and swirled until the iron pill was dissolved. The initial volume of the reading in the buret was recorded, and permanganate was added to the iron pill solution in flask 1 until the same point is reached. The final volume reading was recorded, and the exact volume of the permanganate used was found. The titration process was repeated using the iron pill in flask 2. The mixtures in flasks were washed down the drain, and the flasks were rinsed with water.The buret was rinsed with tap water and the stopcock was open for storage. RESULTS: Standardization: FAS mass Flask #1: 0. 500 gtarred: 0. 485 g FAS mass Flask #2: 0. 501 gtarred: 0. 496 g FAS mass Flask #3: 0. 497 gtarred: 0. 467 g KMnO4 |Initial V (mL) |Final V (mL) |Solution used (mL) | |Titration #1 |0. 01 |25. 45 |25. 44 | |Titration #2 |0. 00 |26. 36 |26. 36 | |Titration #3 |0. 00 |24. 31 |24. 31 | |Iron Pills: Iron Pill mass Flask #1: 0. 286 g Iron Pill mass Flask #2: 0. 293 g KMnO4 |Initial V (mL) |Final V (mL) |Solution us ed (mL) | |Titration #1 |0. 00 |18. 09 |18. 09 | |Titration #2 |0. 00 |18. 17 |18. 7 | |The data found in this lab allowed for the discovery of the percentage by composition of Fe2+ in the iron pills. For the standardization data, the different titrations is the independent variable, and the volumes of KMnO4 is the dependent variable. In order to find the percentage by composition of Fe2+ in the iron pills, the KMnO4 needed to be titrated and the starting, final, and solution used needed to be recorded. The solution used will later be used in liters to find the molarity of each flask of KMnO4. The data above the table is how much FAS was in each flask when it was tarred, and with the flask itself.For the iron pills data, the different titrations is the dependent variable, and the volumes of KMnO4 is the dependent variable. For each titration, the initial, final, and solution used is recorded on this data table also. The solution used will later be used in liters to determine the gra ms of Fe2+. The data above the table is how much iron was in each flask measured in grams. CALCULATIONS: Flask 1: 0. 485g (1 mol FAS/392. 16g) (2 mol KMnO4/10 mol FAS) = 2. 473*10-4 mol KMnO4 Flask 2: 0. 496g (1 mol FAS/392. 16g) (2 mol KMnO4/10 mol FAS) = 2. 530*10-4 mol KMnO4 Flask 3: 0. 467g (1 mol FAS/392. 6g) (2 mol KMnO4/10 mol FAS) = 2. 340*10-4 mol KMnO4 Flask 1: (2. 473*10-4 mol KMnO4/0. 02544L) = 0. 00972M Flask 2: (2. 530*10-4 mol KMnO4/0. 02636L) = 0. 00960M Flask 3: (2. 340*10-4 mol KMnO4/0. 02431L) = 0. 00980M Average M = 0. 00971M Flask 1: 0. 01809L (0. 00971 mol/1L) = 1. 7565*10-4 mol MnO4- 1. 7565*10-4 mol MnO4- (0. 00971 mol/1L) (5 mol/1 mol) = 8. 78270*10-4 mol Fe2+8. 78270*10-4 mol Fe2+ (55. 85g Fe2+/1 mol Fe2+) = 0. 04905g Fe2+ Flask 2: 0. 018171L (0. 00971 mol/1L) = 1. 7643*10-4 mol MnO4- 1. 7643*10-4 mol MnO4- (5 mol/1 mol) (0. 00971mol/1L) = 8. 8215 mol Fe2+ 8. 8215 mol Fe2+ (55. 85g/1 mol) = 0. 492g Fe2+ (0. 04905g Fe2+/0. 286g Fe2+) * 100 = 17. 15% (0. 0492 g Fe2+/0. 293g Fe2+) * 100 = 16. 82% 17. 15% + 16. 82% = 33. 97% (33. 97% / 2) = 16. 99% DISCUSSION: The results from the lab procedure fully support the lab results expected. If the validity of the lab was not reliable, then the percentage of iron in the iron pills would not be 17%. The results from the lab was 16. 99% which is extremly close to the actual percentage of iron. The results compare with the manufacturer’s stated vcalue of %Fe because the results were over the percentage depicted by the company by . 31%. There were 389. 5mg in each pill, and 16. 9% of this would be 66. 18mg. Compared to 65mg which was determined by taking 10 pills, weighing them, and dividing by 10, the desired yield was reached. Any mistake in discrepancy greater than 5% would be a mistake in the titration process or misweighed mass. Titration was used in this lab to oxidize the Fe2+ to Fe 3+ in the FAS, using potassium permanganate solution. It was then used to determine the concentration of F e2+ in iron pills. The results supported the scientific concept of titration because the process was done right and carefully in order to get the closest results to 17% as possible.There was one validity error made in the lab though while the titration process was being done. With flask #2, the stopcock on the buret was not turned parallel to the ground in time and too much KMnO4 was added to the flask. This caused the color to be more of a light magenta color, instead of a peachy or salmony color like flask #1 and #3 were. As explained before, this did not interfere with the results of the percentage of iron in the iron pills, as it was . 01% away from being exactly correct. It is still a validity error, and needs to be taken into account.For the next time this lab is performed, the person doing the titrating should be extremly careful to do it right and take their time, in order to get the best results possible. (Picture: To the left is flask #1, the middle is flask #2 and shows t he validity error, and to the right is flask #3. Flask #1 had a translucent peachy color, flask #2 had a translucent light magenta color, and flask #3 had a translucent salmon color (the lightest). ) CONCLUSION: This lab definitely explains how to do a titration, but also gives a hands on experience and visual of the chemical reaction of iron oxidizing from Fe2+ to Fe3+.It also gives a hands experience and visual of determining the concentration of Fe2+ in iron pills. This lab was quantitative because it refers to how much the amount of the present element or compound there is. The theoritical data compares to the experimental data because the theoretical data gave the conclusion that there was 17% iron in the iron pills. The experimental results gave a very similar result at 16. 99%. With those results, this lab was a success and brought to the conclusion that even with a small error with the titration, the validity of this lab is very reliable.

Poverty And Its Effects On Children Essay - 1111 Words

Edgar Perez Mrs. Prince ENG 1113 16 November 2016 Poverty in America As of 2013 approximately 45 million people in America lived below the poverty line. In an average three-person household, an annual income of $20,090 is federally considered to be at poverty level. In the year of 2014, 44 percent of children under the age of 18 were living at or below the poverty level. Coming from a low economic standing can be detrimental for children’s physical and mental states. Pursuing a higher education without proper funding can become nearly impossible. Most importantly however, without income of some sort children can go hungry. The poverty crisis in America not only affects the adults but it truly affects children through nutrition, education, and psychological factors. Food is an essential part of our health and what we choose consume can affect our lifestyle. Human beings have a cycle, which includes eating, sleeping and reproducing. Out of all the elements of the cycle, eating is the most important but also the most expensive t o maintain. Living in poverty and not having enough income to purchase food can be devastating to a family and their health. The children’s health is affected the most because in early childhood, it is important that a child has adequate nutrition to ensure healthy growth, a strong immune system and cognitive development. Proper nutrition is vital to the growth and development of a child. Not having a sufficient amount or the right kinds of food at aShow MoreRelatedEffects Of Poverty On Children1553 Words   |  7 PagesHow Poverty Effects Children Makayla Ray University of Alabama in Birmingham Abstract This literature review of twelve previously published research articles has focused on summarizing some of the effects of poverty on children. The selected articles all focused on the major effect of poverty on children, and were sorted into four sub-categories or themes based upon a specific focus areas of this complex and not yet fully understood issue. These themes included developmental, educationalRead MoreEffects Of Poverty On Children1554 Words   |  7 PagesEffects of Poverty on Children Makayla Ray University of Alabama in Birmingham Abstract This literature review of twelve previously published research articles has focused on summarizing some of the effects of poverty on children. The selected articles all focused on the major effect of poverty on children, and were sorted into four sub-categories or themes based upon a specific focus areas of this complex and not yet fully understood issue. These themes included developmental, educationalRead MorePoverty And Its Effects On Children859 Words   |  4 PagesPoverty is existing worldwide epidemic and it is affecting millions of adults and children mentally, physically and emotionally .Poverty is the inability to purchase or have access to the basic human needs. This includes food, shelter, education, clean water and proper sanitation .It depends not only on income but also on access to services. In 1998 a UN Statement on poverty, signed by the heads of all UN agencies stated: defines poverty as â€Å"the denial of choices and opportunities, violation of humanRead MorePo verty And Its Effects On Children1377 Words   |  6 PagesPoverty Poverty is a chronic issue not just within the United States but throughout the whole world, but one thing that people tend to overlook is the effect that poverty has on childhood. Many children grow up in poverty and the effects can last for a life time. For many of these kids who grow up in these conditions the effects include poor health, a high risk for teen pregnancy, and the lack of an education. Poor health is a direct of effect of poverty, children with families with no money orRead MorePoverty And Its Effects On Children985 Words   |  4 PagesPoverty doesn’t have preferences, it doesn’t choose people by race, religion, or age. Many people don’t see the effects poverty has on people or sometimes they don’t care but you should. What if you were put in the situation where you lost everything and weren’t able to recover. Now imagine this is your child. Many people put a generic face upon poverty. Usually they see the poor African American person, or the old man who looks dirty, or even the woman who is selling her body just to buy a biteRead MorePoverty And Its Effects On Children2452 Words   |  10 Pagespeople living in poverty out of the 316.5 million inhabitants of the United States of America. That means about 14.5% of people live below the poverty line, which is an extremely large amount for such a lucrative world dominating countr y. Poverty is a very serious issue in the United States and has devastating effects, yet it continues to effect massive amounts of people. It is essential that Americans make the necessary changes to combat poverty because those living in poverty often experience aRead MorePoverty And Its Effects On Children1771 Words   |  8 Pages What is poverty? For people who do not know what poverty is, the Merriam- Webster dictionary defines it as â€Å"the state of one who lacks a usual or socially acceptable amount of money or material possessions† (Poverty). To make it even easier it is basically the state of being extremely poor. Poverty is a huge global issue and it can affect anyone. Whether the person is young or old, male or female. Poverty does not discriminate against people, which is why people should not sit back and ignoreRead MorePoverty And Its Effects On Children945 Words   |  4 PagesPOVERTY MALNOURISHMENT Childhood and adolescence are expected to be the times of great functioning and physical health, yet poverty provokes this from occurring and children face poor health. Children living in poverty are at immense risk for their development, health and overall well-being. According to Komro, 2011, the absolute rate of poverty among children is higher in the United States than in other industrialized nations. Nationally, One in five children are living in poverty (Raphel,Read MorePoverty And Its Effects On Children942 Words   |  4 Pagesand physical health, yet poverty provokes this from occurring and children face poor health. Children living in poverty are at immense risk for their development, health and overall well-being. According to Komro, 2011, the absolute rate of poverty among children is higher in the United States than in other industrialized nations. Nationally, One in five children are living in poverty (Raphel, 2014). Malnourishment is one of the numerous outcomes fr om poverty; children are suffering each day inRead MoreThe Effects of Poverty on Children Essay1217 Words   |  5 Pages When analyzing children growing up in poverty a lot of factors come into play such as their physical, psychological and emotional development. To grow up in poverty can have long term effect on a child. What should be emphasized in analyzing the effects of poverty on children is how it has caused many children around the world to suffer from physical disorders, malnutrition, and even diminishes their capacities to function in society. Poverty has played a major role in the functioning of families