wet steam formation is called as wet steam formation is called as

/Widths 9 0 R << As water has liquid form, its gaseous form is called as steam. WebThis set of Energy Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geothermal Energy. Steamisusedfor generating power and also used in process industries such as sugar, paper, fertilizer, refineries, petrochemicals, chemical, food, synthetic fibre and textilesThefollowing characteristics of steam make it so popular and useful to the industry: Types:Wet steam, Dry steam, Superheated steam, Wet Steam:When steam contains water particles then it is known as Wet steam. Cookies are only used in the browser to improve user experience. Privacy Policy 9. Water possesses unique physical properties, without which life would probably never have evolved on earth. The Celsius temperature of the triple point of water is 0.01C and the pressure at triple point for water is 0.006114 bar. stream In this diagram, the evaporation lines bc at all pressure can be divided into ten equal parts. It exists at a saturation temperature containing more than 5% water. Draw a horizontal through TS and a vertical through point d let these lines intersect at e. Then the point e represents the condition of the superheated steam at pressure P1. WebWet steam - a portion of the water molecules have lost their energy - latent heat - and condensed to tiny water droplets To produce 100% dry steam in an boiler and keep the steam dry throughout the piping system is in general not possible. What is the new internal energy of the ideal gas in terms of U? So we are left with simply, The dryness fraction is determined as follows. Then first of all use temperature scale. WebIf the water content of the steam is 5% by mass, then the steam is said to be 95% dry and has a dryness fraction of 0.95. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. WebThe wet bulb temperature of air is also measured by the ordinary thermometer, but the only difference is that the bulb of the thermometer is covered by the wet cloth. The enthalpy given in the tables is for heating at constant pressure. The enthalpy added during the superheat phase is the superheat enthalpy. Subcooled water is used in expansion valve and compression safety. /CapHeight 632 >> View Answer, 2. Copyright 10. << For at a certain temperature, the saturated vapour will have a certain pressure (look at the values in the left hand column of the saturation tables). b) decreases [778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 250 333 408 500 500 833 778 180 333 333 500 564 250 333 250 278 500 500 500 500 500 500 500 500 500 500 278 278 564 564 564 444 921 722 667 667 722 611 556 722 722 333 389 722 611 889 722 722 556 722 667 556 611 722 722 944 722 722 611 333 278 333 469 500 333 444 500 444 500 444 333 500 500 278 278 500 278 778 500 500 500 500 333 389 278 500 500 722 500 500 444 480 200 480 541 350 500 350 333 500 444 1000 500 500 333 1000 556 333 889 350 611 350 350 333 333 444 444 350 500 1000 333 980 389 333 722 350 444 722 250 333 500 500 500 500 200 500 333 760 276 500 564 333 760 500 400 549 300 300 333 576 453 333 333 300 310 500 750 750 750 444 722 722 722 722 722 722 889 667 611 611 611 611 333 333 333 333 722 722 722 722 722 722 722 564 722 722 722 722 722 722 556 500 444 444 444 444 444 444 667 444 444 444 444 444 278 278 278 278 500 500 500 500 500 500 500 549 500 500 500 500 500 500 500 500] Density of water and vapour at the point C is same. Mixture of steam and liquid water is called as W =0. d) none of the mentioned geothermal energy, form of energy conversion in which heat energy from within Earth is captured and harnessed for cooking, bathing, space heating, electrical power generation, and other uses. 10.7, m represents the state where Vf = 0.0010434 m3/kg at 1 bar pressure. It helps to improve the efficiency of steam power plants. 1. If we know the pressure within the main steam supply pipe of the calorimeter then we can find the dry and wet saturation values of the enthalpy from the steam tables, hg1and hf1, respectively. /LastChar 255 If saturated steam does not contain any water, it is known as dry and saturated steam. Toughness of concrete is only 1-2% of steel. Before 1954 there were two fixed points . /Encoding /WinAnsiEncoding Dryness fraction lines are shown on T-S diagram of Fig. The additional amount of heat supplied to the steam during superheating is called Superheated means that the substance is heated above its saturation temperature. <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S>> /CapHeight 632 Thus a complete T-S diagram for pressure P1 is shown in Fig. /FontName /Calibri-Bold Vapor at the temperature of the boiling point corresponding to its pressure. It exists at a saturation temperature containing more than 5% water. The resulting volume is known as Specific Volume of Then, increase in entropy due to superheating is . When x = 1, the steam is said to be dry and saturated. Home alachua county covid relief fund wet steam formation is called as. So from above table at 150values of properties of steam are. This website uses cookies and third party services. Sometimes sensible heat is called the liquid heat or liquid enthalpy. If the steam at pressure P1 had been wet, with a dryness fraction of x, the entropy of evaporation would be . We can then find the dryness fraction from, Previous Years GATE Questions on Engineering Materials 2002-2011, Previous Years GATE Questions on Joining Process 2005-2011, Previous Years GATE Questions on Joining Process 2001-2004, Previous Years GATE Questions on Forming Process 2007-2013, Previous Years GATE Questions on Forming Process 2004-2006. Before uploading and sharing your knowledge on this site, please read the following pages: 1. A wet saturated vapor is a substance in the gaseous state which does not follow the general gas law. endobj Web 3 The Process Of Wet Steam Formation Is Called, 46 Metascore A guy who complains about God as well frequently is specified almighty If heat is added to the wet steam temperature _________ WebWet steam is characterized by the vapor quality, ranging from zero to unity open interval (0,1). Sensible heat = hf (uf uo) + P (vf a). Thus, we see that energy is supplied in three stages to generate steam at a pressure P from water at 0C. 6 0 obj Formation of Steam 2. Before obtaining these values let us understand few more things. WebWhile formation of HdPCH 3 from Pd and CH 4 is only weakly exothermic (28 kJ/mol), formation of HPdCH 2 CH 3 from Pd and C 2 H 6 is significantly more favorable (63 kJ/mol). 3) Condensate pumps running, it may be stopped after 4-5 hrs. Let us discuss abut different types of steam in the section given below. It is generally denoted by the letter x. The processes of dew formation do not This curve is known as the saturation liquid line or simply liquid line. endobj Similar constant pressure lines can be drawn for superheated steam at other pressures. For super-heated steam, different table is given. a) humidity in pipelines /FontDescriptor 5 0 R A dry saturated vapor is a substance in the gaseous state which does not follow the general gas law. When the clouds are full of water, or saturated, they release some of the water as rain. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Report a Violation 11. Prohibited Content 3. As the base of the diagram represents entropy of the steam, an adiabatic (isentropic) expansion will be represented by a vertical line. Corrosion B. /Encoding /WinAnsiEncoding In a throttling process, which of the following parameters remains constant? When it reaches cooler air, it condenses to form clouds. Repeat this for other valves of Ts the temperature T1 remaining the same, as the pressure is constant. We can then find the dryness fraction from. Fig. Since, the temperature again remains constant andenthalpykeepincreasing, the heat absorbed during this is latent heat of vaporization. Steam may occur in any one of the following three conditions: (i) Saturated steam which may be either dry or wet. The sun's heat causes water to evaporate from streams, lakes, rivers, and oceans. c) inlet of the boiler 3. If heat is supplied to the saturated vapour and to the liquid with which it is in contact, more liquid evaporates 1. This condition of steam is obtained when it is cooled by its own expansion until it contains less heat energy than the saturated steam under the same conditions. <> This is the difference for 0.5 bar pressure. Entropy of evaporation. [778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 778 250 333 555 500 500 1000 833 278 333 333 500 570 250 333 250 278 500 500 500 500 500 500 500 500 500 500 333 333 570 570 570 500 930 722 667 722 722 667 611 778 778 389 500 778 667 944 722 778 611 778 722 556 667 722 722 1000 722 722 667 333 278 333 581 500 333 500 556 444 556 444 333 500 556 278 333 556 278 833 556 500 556 556 444 389 333 556 500 722 500 500 444 394 220 394 520 350 500 350 333 500 500 1000 500 500 333 1000 556 333 1000 350 667 350 350 333 333 500 500 350 500 1000 333 1000 389 333 722 350 444 722 250 333 500 500 500 500 220 500 333 747 300 500 570 333 747 500 400 549 300 300 333 576 540 333 333 300 330 500 750 750 750 500 722 722 722 722 722 722 1000 722 667 667 667 667 389 389 389 389 722 722 778 778 778 778 778 570 778 722 722 722 722 722 611 556 500 500 500 500 500 500 722 444 444 444 444 444 278 278 278 278 500 556 500 500 500 500 500 549 500 556 556 556 556 500 556 500] d) none of the mentioned The heat is produced 8 0 obj WebArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. Steam has been a popular mode of conveying energy since the industrial revolution. The P V and T S Diagrams for H2O (Vapours): P V Diagram for Saturated Liquid and Vapour: The saturated water curve (liquid line) is obtained by plotting P and Vf values form the steam tables on P-V coordinates and T-Sf values on T-S coordinates. The values tabulated in the steam tables are determined accurately by experiments. Internal Energy and Entropy 5. If we know the temperature and the pressure in the expansion chamber then we can tell if all of the steam has changed to vapour. Entropy of wet steam. endobj Phase Diagram for a Pure Substance 6. The total heat supplied from OOC is called Enthalpy of Wet Steam (h wet). At D which is boiling point of water. c) two phase mix In steam turbines the formation of wetness causes additional dissipation, blade erosion, and corrosion problems. Repeat this for other pressures and temperatures and draw a curve through the points obtained. A sample of ideal gas has an internal energy U and is then compressed to one-half of its original volume while the temperature stays the same. d) none of the mentioned For example, if the pressure of saturated steam is observed by the pressure gauge, its temperature can be found from steam tables in which the results of various experiments have been tabulated. Saturated So the enthalpy of this dry steam will beh, . | Erfahren Sie mehr ber die Berufserfahrung, Ausbildung und Kontakte /Widths 12 0 R In super-heated vapor the temperature is higher than the boiling point temperature corresponding to the pressure. Wet steam As discussed above, steam contains particles of liquid water. The process of wet steam formation is called Priming. The liquid form of water gets converted to gaseous phase called as steam. The latent heat is, therefore, used for two purposes: (i) To overcome the internal molecular resistance of the water by changing it from water into steam. is the enthalpy of liquid that is water at boiling point thats why subscript l is used, point D in h-T diagram. /Flags 32 Steam whose temperature comes higher than its vaporization point at the absolute pressure (where the temperature is measured) is superheated steam. By First Law of Thermodynamics as applied to non-flow process, heat supplied = change in internal energy + external work done by water. XL=:u("]H+?exZjF@qS7yqx8N\`da1z2J?A_^>>.{@p3#"~mLGA>t7h0'4~'[2F=f>tU0gM) Ucqn:X0tcun8m5]I qY\V% U]0F5M(V^U  3bg19J{P>YuhO1}kOYuF[w It is always, preferable to refer to the tables for accurate values. Supersaturated steam is also called as _________ Temperature of the ordinary air measured by the thermometer when it is covered by wet cloth or wick is called as the wet bulb temperature, commonly referred to as WBT. IV) Melting point, According to the kinetic theory of gases, the absolute zero temperature is attained when. 3.15. It is the quantity of heat required to convert 1 kg of water at saturation temperature for a given pressure to one kg of dry saturated steam, at that pressure. The steam table exists for a wider range of pressure and temperature values, here only a limited range is discussed. WebThe superheater is a heat exchanger that converts saturated or wet steam into superheated or dry steam. c) Its soda alkalinity should be 0.45-1 ppm. M$H\qi "J;_Pw0->a4(bR)MZG^,L_gV, wGE,3w4d=Z6bM{ NGL%39g2. Temperature of the ordinary air measured by the thermometer when it is covered by wet cloth or wick is called as the wet bulb temperature, commonly referred to as WBT. When we provide continuous heat to water then at100temperatureand 1atmpressure, it boils and changes its phase from liquid to vapour. FBiH Konkursi za turistike vodie i Before uploading and sharing your knowledge on this site, please read the following pages: 1. The sensible heat supplied in the warming stage is used for two purposes: (i) To increase the temperature of 1 kg of water from 0C to ts. d) none of the mentioned Steam: Properties, Tables, Phase Diagram and Saturated Steam | Thermodynamics, Entropy of Vapours in 3 Phases: Water, Evaporation and Superheated Steam | Thermodynamics, Steam: Generation, Types and Volume | Energy Management, Simple Vapour Power Cycles: Carnot & Rankine Steam Plant Cycles | Thermodynamics, Unconventional Machining Processes: AJM, EBM, LBM & PAM | Manufacturing, Material Properties: Alloying, Heat Treatment, Mechanical Working and Recrystallization, Design of Gating System | Casting | Manufacturing Science, Forming Process: Forming Operations of Materials | Manufacturing Science, Generative Manufacturing Process and its Types | Manufacturing Science. %PDF-1.5 Such a chart is very convenient for solving problems containing an adiabatic (reversible) expansion of steam. The most common example of a vapor is steam - water vaporized during boiling or vaporation. endobj Compressed water and sub cooled water are same in nature. engineeringenotes.com All rights reserved. Web 3 The Process Of Wet Steam Formation Is Called, 46 Metascore A guy who complains about God as well frequently is specified almighty powers to show him how tough it is to run the whole world. Curves can then be drawn through each corresponding tenth part of these lines. The throttling calorimeter makes use of the fact that the enthalpy before throttling is the same as that after throttling, in order to determine the dryness fraction, x, of the steam passing through the calorimeter. /CapHeight 662 Thus, in order to observe the above two properties of steam, pressure gauges and steam calorimeters or thermometers are used at suitable points. stream At E we have converted all liquid into steam. Content Guidelines 2. The conversion starts taking place at saturation temperature where both the phases of water co-exist with each other. 3.14. 9 0 obj As more heat is transferred, the temperature keeps rising until it reaches 100C. WebWet steam is characterized by the vapor quality, ranging from zero to unity open interval (0,1). After steam bubbles break the water surface, they carry water droplets this is called as ________a) entrainmentb) capillarityc) reverse capillarityd) none of the mentionedAnswer: aClarification: When steam bubbles break water surface they carry some water droplets. Also the steam point is extremely sensitive to a change in pressure. Under these conditions, water exists in the liquid phase, and it is called a compressed liquid, meaning that it is not about to vaporize. If the temperature of the steam is greater than that of the boiling point or saturation temperature corresponding to the pressure of steam generation, the steam is known as superheated steam. This is so because of latent heat of fusion. WebWhen steam condenses, its volume is dramatically reduced, which results in a localised reduction in pressure. Superheat cannot be imparted to the steam whilst it is still in the presence of water, as Sensible heat of water hf may be found approximately by multiplying its specific heat by its saturation temperature. In practice it may not be and one solution is a combination Separation and Throttling Calorimeter. All Rights Reserved. We have seen that for each liquid, a certain definite boiling point exists for each pressure. /BaseFont /TimesNewRomanPS-BoldMT The Mollier diagram is used by design engineers while designing a power plant, the data is used for checking properties of the air at different temperature and pressure values. These tables are to be used because vapours do not obey general gas law. in this way, we can get all the properties,. WebSteam which is formed in contact with water is known as saturated steam. Hydraulic water hammer is caused by _______a) wet steamb) dry steamc) pressurized waterd) none of the mentionedAnswer: aClarification: Hydraulic water hammer is caused by wet steam. 16 0 obj S7{cU(!X7=F,'!vs9:kJJp Now if we change the pressure then the boiling temperature also changes. Flashcards. This steam is mostly used in Power generation. We and our partners use cookies to Store and/or access information on a device. If the system is suitably insulated then there is no heat transfer so Q= 0. 11 91 51 Question 138 1 / 1 pts During the formation of the moon, it is believed the ________ was the last phase. Wet steam is also known as supersaturated steam. Steam: Formation, Conditions, Properties and Enthalpy | Thermodynamics, Entropy of Vapours in 3 Phases: Water, Evaporation and Superheated Steam | Thermodynamics, Steam: Generation, Types and Volume | Energy Management, Simple Vapour Power Cycles: Carnot & Rankine Steam Plant Cycles | Thermodynamics, Unconventional Machining Processes: AJM, EBM, LBM & PAM | Manufacturing, Material Properties: Alloying, Heat Treatment, Mechanical Working and Recrystallization, Design of Gating System | Casting | Manufacturing Science, Forming Process: Forming Operations of Materials | Manufacturing Science, Generative Manufacturing Process and its Types | Manufacturing Science, The P V and T S Diagrams for H2O (Vapours), Mollier Diagram or Total-Heat-Entropy or Enthalpy-Entropy Diagram (h-s Diagram). WebSteam used by food processors commonly falls into two broad categories. Pure substance is a substance consisting only of a single molecular species such as He, H2, H2O or NH3, phases of these substances being different namely solid, liquid and gaseous. For dryness fraction, we have to do calculations but thats beyond the syllabus of BME. oa>e%FD iGXaI5zTuvEcce=/giKMv7n!RiE_3 ~l/@N,,XyV|( tI ?{ Vm+m5^kP|{O%~u.p+jA=3 Vj. All particles are vaporized - any decrease in vapor temperature or increase in vapor pressure, condensates liquid particles in the vapor. /Type /Font c) reverse capillarity Paper I of the SSC JE ME is scheduled to be conducted from 14th November 2022 to 16th November 2022. The value of hf given in the steam tables accounts for the variation in the specific heat of water. /FirstChar 0 WebA wet saturated vapor is a substance in the gaseous state which does not follow the general gas law. If I was piping a steam boiler and it had 10 holes for risers, Id use them all. When we heat water enough to a temperature of 100 degrees celsius, then the liquid temperature starts converting to gas or steam. Circulating fluidized bed (CFB) boilers with wet flue gas desulfurization (WFGD) system is a popular technology for SO2 removal in the coal-fired thermal power plant. These curves or lines are known as constant dryness fraction lines. In practice it is difficult to get an absolutely dry saturated steam if it is produced by boiling water, because some of water particles are carried away with the steam. Such a state of steam occurs in expansion in a nozzle. Conditions of Steam 3. From dry saturated condition a vapour receives superheat and its temperature rises above saturation temperature tsat. Dry Saturated Vapor A dry saturated vapor is free from liquid particles. d) none of the mentioned Theuse of dryness fraction allowus to know both the mass of dry steam and mass of water vapour. and hfg = enthalpy of vaporization 1 kg of dry saturated steam. W =0. Here, the ODH of ethanol takes place in the absence of a gaseous oxygen stream; instead, oxygen is supplied from a metal oxide, an active support for an ODH catalyst. Webbe wet steam. (b) Sensible In order to determine the properties of steam at some intermediate pressure between those given in tables, we interpolate assuming the linear relation between these values. The final condition of the steam after expansion can also be read off from the diagram. Fibre reinforced concrete provide better toughness to concrete. Wet steam contains unevaporated water droplets, held in suspension. whereall the liquid water has converted into steam. /StemV 87 Web326 reviews of J2 Carpet & Tile Cleaning "Very large house, two kids and dog. QA Leopold Maxwell 04.06.2022 0 Comment The key difference between wet dry and superheated steam is that wet steam is at the boiling point of water and contains water droplets , and dry steam is at the boiling point of water but has no water droplets, whereas superheated steam is at a higher Resistance of water dominating the steam is called as _______a) hydraulic water hammerb) erosionc) contaminationd) none of the mentionedAnswer: bClarification: Resistance of water hammer dominating steam is called erosion. Saturated steam is a vapour at the temperature corresponding to the boiling point of the liquid at the imposed pressure. Let this increase of entropy be represented by the horizontal distance cd. without doing any calculation or other thing. /FontDescriptor 8 0 R Image Guidelines 4. The resulting volume is known as specific volume of dry steam. The steam table for compressed water also exists for a wide range of temperature and pressure values, here only a limited range is being discussed. Disclaimer 8. /ItalicAngle 0 When a boiler is steaming (i.e., producing steam) Start counting from any bag randomly, go on counting as 1,2,3 up to r and so on, r being equal to the integral of N/n. It contains just sufficient heat energy to maintain all of The method is very simple and at the same time accurate. An increase in the pressure or decrease in the temperature will not - within limits - condensate out liquid particles in the vapor. It has now entered the superheat phase. /FontBBox [-503 -313 1240 1026] Candidates can check out SSC JE ME Admit Cards here. If W is the weight of dry steam in the total steam Wt, then x = Ws/Wt. WebWhen hard water is used in the boiler to convert it into soft water. 1,12,400/- pay scale. It should be noticed that the area of the chart between the water line and the dry steam line represents wet steam. When steam is superheated, its temperature is known and when its pressure is known the enthalpy of 1 kg of steam can be obtained by the use of the formula given below: where Hsup = enthalpy of 1 kg of superheated steam, hfg = enthalpy of vaporization 1 kg of dry saturated steam, Cp = mean specific heat of superheated steam at constant pressure. WebPriming: When steam is produced rapidly in boilers the steam velocity suddenly increases and some droplets of liquid water are carried along with steam. Privacy Policy 9. x^]Y7~AU$\`1!=[2yeV[[?c.$3+Yd3UU_Sse+~tw~M9v/@Uc?WG/_5yst?G?s$ac':zZy?s_ TCGpG_]U12NsV0SW{~kaJFiZ2:5hSwxmx^U1?KcdSg6k[BhkOfX0zeL{m3mC[l#^=zd4lkzxXlJk9cO==bEShZ[6;~h=E+.ck'>/4sZ"fFQP/I9H(P% WebThe steam produced is called saturated steam. Entrainment happens at __________ Terms of Service 7. Electric calorimeter , steam Formation, 2D ,3D graph , all are included in this ppt. Internal energy of steam. Method of linear interpolation to find, say, enthalpy at 10.2 bar pressure. It helps minimize erosion of turbine blades and eliminates entrained water particles from turbine steam. 8. Properties 4. Plagiarism Prevention 5. WebThe steam will become wet as it picks up condensate droplets, reducing its heat transfer potential. Constant pressure lines are straight lines in the wet region and curved in the superheat area. /BaseFont /TimesNewRomanPSMT Boiling is the formation of vapor bubbles within a fluid. Suppose the initial temperature of ice is a solid phase of water is-10.Now,keeping pressure constant which is again assumed as 1atm, we provide continuous heat to the ice. Steam of which the pressure is less than, equal to, or not greatly above, atmospheric pressure. This state of steam is varying, unstable and the steam soon returns to the saturation condition. The Mark III design consists of a primary containment and a drywell. Evaporation from a fluid takes place when liquid molecules at the liquid surface have enough momentum to overcome the intermolecular cohesive forces and escape to the atmosphere. The steam can be used in many industrial applications. Vapor is a gas - there is no significant physical or chemical difference between a vapor and a gas. WebDry Saturated Steam and Wet Steam: If saturated steam does not contain any water, it is known as Dry Saturated Steam. 2 0 obj Webwet steam formation is called asbrassaiopsis mitis for sale. If a water exists as a liquid at the saturation temperature and pressure with quality of x = 0, it is called a saturated liquid state (single-phase). The isothermal process is associated with: For which of the following substances, the internal energy and enthalpy are the functions of temperature only, SSC English Previous Year Questions Mock Test Series, SSC Reasoning Previous Year Questions Mock Test Series (17k+ Questions), A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy U of the gas in joules will be. WebAnswer (1 of 7): Steam is Wet when it has been insufficiently heated to transpire the latent heat of evaporation. WebThe steam is then described as superheated by the number of temperature degrees through which it has been heated above saturation temperature. Wet steam is a mixture of steam and liquid water. 4 0 obj Such a point is known as state point. The candidates who will clear the exam will get a salary as per the Rs. The actual enthalpy of evaporation of wet steam is the [507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 507 226 326 401 498 507 715 682 221 303 303 498 498 250 306 252 386 507 507 507 507 507 507 507 507 507 507 268 268 498 498 498 463 894 579 544 533 615 488 459 631 623 252 319 520 420 855 646 662 517 673 543 459 487 642 567 890 519 487 468 307 386 307 498 498 291 479 525 423 525 498 305 471 525 229 239 455 229 799 525 527 525 525 349 391 335 525 452 715 433 453 395 314 460 314 498 498 507 498 250 305 418 690 498 498 395 1038 459 339 867 498 468 498 498 250 250 418 418 498 498 905 450 705 391 339 850 498 395 487 226 326 498 507 498 507 498 498 393 834 402 512 498 306 507 394 339 498 336 334 292 550 586 252 307 246 422 512 636 671 675 463 579 579 579 579 579 579 763 533 488 488 488 488 252 252 252 252 625 646 662 662 662 662 662 498 664 642 642 642 642 487 517 527 479 479 479 479 479 479 773 423 498 498 498 498 229 229 229 229 525 525 527 527 527 527 527 498 529 525 525 525 525 453 525 453] Entropy of water. engineeringenotes.com All rights reserved. If we know certain properties, the other properties may be found out or derived. Wet steams causes corrosion.a) Trueb) FalseAnswer: aClarification: Wet steam may causecorrosionerosionhydraulic water hammer in pipelinesdestroy turbine blades etc. During this stage further heat is supplied to 1 kg of water at tsat, the saturation temperature corresponding to the constant pressure P. The volume changes from vf to vg. The velocityC, , so the change in the kinetic energy is neglected. Consider 1 kg steam at absolute pressure P1, the absolute temperature of formation at this pressure will be T1; the value of T1 can be obtained from the steam tables. C is the critical point where pressure is 221.2 bar, saturation temperature is 374.15C and volume is 0.317 m3/kg. If we know the temperature and the pressure in the expansion chamber then we can tell if all of the steam has changed to vapour. We know that to determine the temperature of any system, the thermometer must be brought to thermal equilibrium with an arbitrarily chosen standard system in an easily reducible state. In other words, during a throttling process the enthalpy remains constant. ~K]l#2X\O YN.n!m~|AF@ ?3= c/tp;|+f[!.7)xRw O#0L7:pi`|Y%t3Z\Hc This steam does not obey So we are left with simply. /FontBBox [-568 -307 2046 1040] It is necessary to understand the properties of steam so that we can make proper use of it. Due to this mist the wet steam is visible. Mixture of steam and liquid water is called as _________a) dry steamb) wet steamc) saturated steamd) none of the mentionedAnswer: bClarification: Mixture of steam and liquid water is called as wet steam. /StemV 165 The process of wet-steam formation is called. Let this value of Sf1 be represent by ab to a convenient scale, and plot this distance on T-S diagram of Fig.