Steam Definition and 516 Threads

Hello, I came to consider the following problem, and cannot seem to find the right way to tackle it. It is not homework, merely a question I'd like to address out of personal curiosity: Consider two volumes V1 and V2, each assumed adiabatic, and linked with a valve. V1 is considered...

This is not homework question, I'm just curious. Question: What is the purpose of a condenser in a steam power plant? I read that a condenser increases efficiency, but how? Since steam from the turbine exit ideally reduce only in temperature (but maintain the same entropy) why is there a...

I'm trying to understand the differences (if there are any) between steam, water vapor, and humidity. First of all, is there any difference between the meanings of the terms steam and water vapor? Is there a difference between the terms "gas" and "vapor" in general? Also, I was under the...

Hi! It's a real problem where we today have a steam throttle and would like to change it for a steam turbine/expander to provide some electricity. The problem is that the steam is at condensationline: 16 [bar] – T=201,37 [C] – h=2793,65 [KJ/kg]– s=6,4216 [KJ/kg*K] with an isentropic...

Hi everyone, I cannot for the life of me figure this one out: "A nonconducting tank of negligible heat capacity and 1m^3 capacity is connected to a pipeline containing steam at 5bar and 370 deg. C. The tank is filled with steam to a pressure of 5bar then the pipeline is disconnected. a)If...

I don't know if anyone can help but I have a friend who wants to capture his waste steam and convert it to energy - that's the easy bit - the difficulty is how to work out how much energy he has in the first place. He is drying wood by heating a container to 160oC over a period of approx 40...

I know the basic theory to how a steam turbine works. but I have a gap in my understanding of how the thermal dynamics work. I'll outline a scenario and detail the bit I don't understand. simple steam turbine 1/ heat source 2/ boiler 3/ steam jet 4/ impeller The heat source heats...

How should steam quality, mass flow rate, temperature and pressure of the steam be optimized in order to have the most out of turbine? I mean which ones have be to be higher? Also when they design turbine, do they design it based on the properties of the steam or they change the properties of...

Good day, My question relates to the use of a pressure reducing station (pressure reducing valve) in a steam system. As those involved in the design know, pipe sizing is carried out starting with the furthest point (the most demanding point of consumption) and sizing shall start from that...

Homework Statement Ethene + Steam produces ethanol and... Homework Equations CH2=CH2 + H2O ---> CH3-CH2OH or ... The Attempt at a Solution Couldn't find anything. I toyed with ethanal but that requires Potassium Dichromate. One 'source' (i.e. yahoo answers (I think)) suggests there...

Homework Statement How much heat must be removed when 130 g of steam at 145°C is cooled and frozen into 130 g of ice at 0°C. (Take the specific heat of steam to be 2.01 kJ/kg·K.) Answer is in kcal. Homework Equations The Attempt at a Solution I know steam turns back into...

you want to boil a pot of water at 110 C diameter of pot = 15cm atmospheric pressure 101 kPa what weight lid should you use? i looked up the steam tables and water boils at 110 C at 143.27 kPa so do i use that pressure or 143.27-101? (gauge pressure) i used gauge and got something...

Show that there is a mass of (4.8 x 10^-3)kg of steam above the water when the temperature is 122 Celcius? Volume of Steam = 4.2 x 10^-3 (metres cubed) Pressure of steam= 2.1 x 10^-5 (Pa) molar mass of water = 18g per mole molar gas constant = 8.3 Joules/mol/K Homework...

Hi to all...i've a problem. i have to calculate the position and the time of complete evaporation of a continuous water flow which is injected trough a nozzle into a continuous flow of steam in superheated condition. The position (and than the time) at which I'm sure that there aren't water...

Homework Statement An ice cube of volume 12.1 cm3 is initially at a temperature of -18.1°C. How much heat is required to convert this ice cube into steam? (the final answer must be in Joules) Homework Equations Q = m*c*deltaT Q = m*Lf (latent heat of fusion) Q = m*Lv (latent heat of...

Homework Statement Sketch and describe a reaction turbine with a velocity-compounded impulse stage. Homework Equations The Attempt at a Solution Would anyone happen to know where I could find this?? Link?

[PLAIN]http://img706.imageshack.us/img706/981/piccj.png I tried writing the equation Qgain=-Qlost but i don't know how to deal with steam it doesn't have a (c)

Homework Statement How much heat is required to convert 1.0 kg of water at 85°C to steam at 118°C? Homework Equations Q=mc(delta)T Qw+Qs=0? The Attempt at a Solution we know the m(water)=1.0kg and c(water)=4186J/kgC and T=85C so using Heat (Q) formula Q=mcT---...

Hi I am told that steam generator is an area that is suseptible to aging effects and corrosion. I was wondering if anyone can elaborate on this a bit. Is it just due to the heat and humididty? I am studying BWRs and safety and maintanced aspects and I was thinking of focusing on this area...

I bought the latest model 3 months ago. It cleans all of my floors (wood, tile, vinyl) quite well. Main problem I have with this mop is that changing mopheads (e.g., the one for all floors vs. the one for wood floors) is nowhere as easy as shown on the infomercial--you need to have very...

I am a consulting engineer that frequently needs to determine the saturation temperature for various steam pressures. I use a mac computer. I have found many steam table calculator applications for PCs, but have been unable to find one that will run on the mac. Can anyone point me to a...

I am a consulting engineer that frequently needs to determine the saturation temperature for various steam pressures. I use a mac computer. I have found many steam table calculator applications for PCs, but have been unable to find one that will run on the mac. Can anyone point me to a...

Homework Statement Why does the entropy of the water increase with increasing temperature, while the entropy of steam decreases, while the entropy of steam decreases with increasing temperature? The Attempt at a Solution I think the reason why the entropy increases with water is because...

Homework Statement Will 1ml of 100 degrees C water or 1ml of 100 degrees C steam be more dangerous to your skin? Homework Equations not too sure The Attempt at a Solution I keep hearing that steam would be more lethal than the water but I would like some math to back it up. What math...

im from India , in my third year of B.E. Mech degree .. course... and my group is planning to do steam jet refrigeration system...as a MINI PROJECT ( Design And Fabrication Project in the syllabus).. the components of the project are - 1. boiler 2. steam nozzle 3. thermocompressor 4...

Hello reader, I was heating some coffee in the microwave oven today when I had an idea come to me. Is it Possible to heat water with microwaves, (dielectric heating) to superheat water? Then allow it to form to steam, turn that steam into dry steam. And then use that to turn a generator...

I’m an entrepreneur in South Africa with the rights to a type of insulating coating. It’s new on the market here and no real research and development has been done on the coating to determine how much energy it can save. I’m a marketer and I don’t have the educational background to answer this...

hii frends, im a doing a project on the efficiency improvement of a velocity compounded impulse steam turbine. we plan 2 do that by varying the input mass flow rate of steam and finding out the particular mass flow rate at which maximum efficiency is attained. the data i could collect...

Homework Statement Steam at 8 MPa and 500 C flows through a valve, where it exits at 100 kPa. What is the exit temperature? Homework Equations ? The Attempt at a Solution Looked up both pressures on the steam tables. Not sure how to correlate them as I have never used them before.

Hi, I am doing my revi[FONT="Arial"]sion and one of the question got me thinking but I am not sure if I got it right. The question asks what is the effect of variation of steam supply on power output,power factor,armature current and load angle of the synchronous machine. I think...

Homework Statement 18. (II) At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate ehat input of the second. Th eoperating temeprautres of the first are 680 degrees C and 430 degrees C, and of the second 415 degrees C and 280 degrees C...

Does anyone know a suitable engine / turbine / expander that can run under 2 bar (30 PSI) of pressure and generate upto 1 kw power output? Basically a high torque, low pressure...i have been searching like crazy everywhere, cannot find anything...Also will a manufactured tesla turbine be able to...

Homework Statement A well-insulated bucket of negligible heat capacity contains 177 g of ice at 0°C. (a) If 20 g of steam at 100°C is injected into the bucket, what is the final equilibrium temperature of the system? I've already solved this part to be 0 degrees Celsius. (b) What...

Homework Statement A steam engine has a cylinder 80cm in diameter with a piston that has a total travel length of 1.8m. Assume that there is no "dead space" between the cylinder head and the piston when the piston is farthest in the cylinder. Steam is piped into the cylinder head from an...

Homework Statement How much heat in kcal is required to change 1.0 kg of ice, originally at -30 degrees C, into steam at 120 degrees C? Assume 1.0 atm of pressure. (Please use the following values for the constants needed in the problem: Latent heat of fusion=79.7 kcal/kg; Specific heat of...

Hi professionals, I am a student from philippines and im about to design a steam power plant with 74000 KW load. Our professor gave us a 3 steps at first chapter the first is that we assume the pressures needed from P2 to P8 where P2 = 8 MPa assume T2 at centigrade, and get the enthalpies up to...

Homework Statement What is the definition of saturated steam pressure ? Is it the same as saturated vapour pressure ? Is it the same as boiling point pressure ? Homework Equations The Attempt at a Solution

I am working on a Project that involves determination of Quality of Steam. In that I have few queries, so please help if possible: 1. Is there any mathematical relationship between Resistivity of water and temperature? because i am not able to find one, but since i am working on this...

I was sick so I actually missed this lesson in class and this wasn't mentioned in the notes I got from a fellow student, nor is it in my textbook. I can't even find a definition for what it means that the heat of condensation is "evolved," so if anyone can fill me in on that I'd greatly...

Hi everyone! this is my first post here and I would like to discuss a concept I have. If you didnt hear about coanda saucers , the principle is to get as fast and high pressurized air as possible tangentially just above a curved surface, to create a low presure, suction and entrainment of...

Can someone explain something to me: I believe when throttling h1=h2. When calculating enthalpy drop across a FIXED converging nozzle then kinetic energy is caluclated using the following formula: h1-h2 = v2^2/2 - v1^2/2 If the nozzle is converging then there will be an increase in kinetic...

Ok bear with me as this sounds a bit bizarre, especially for a first post. For a while I have been thinking of how to take advantage of the fact that a black passive solar collector can collect low temp BTU's at low costs, but due to the low temperature it can not be utilized in a steam cycle...

I have a heat transfer question, I work in a plant and am doing a re-insulation project. If an unexposed steel steam pipe (k=47) of diameter 10 inches, maintains an internal temperature of 460F and is exposed to ambient air (70F) flowing at 5 mph across the pipe. Determine the heat loss per unit...

Hey all...So i have this project, to use any other liquid apart from water in a solar powered steam engine. At the moment i am still in research phase, and have been reading on quite a few liquids although i have been concentrating on ethanol, as it is readily available and has a BP of 78...

Homework Statement If a steam engine operates at half of its theoretical maximum efficiency (emax) and does work at a rate of W J/s, calculate how much heat is discharged per second. Homework Equations WMax = \epsilon_{Max}*Q_{H} W = QH-QC The Attempt at a Solution W =...

Can somebody aid my understanding: I am re-studying thermodynamics at the moment 6 years on from when I last studied it and could do with some clarification: If at the inlet to a steam turbine the pressure is at say 150bar and 550 degrees then there will be a respective enthalpy which is a...

In the event of grid failure islanding mode of operation of the electric generation unit is known as House load operation. Under this condition turbine generator produce only auxiliary load which is required to keep electric power plant unit alive. After restoration of grid the unit can be...

I've been looking around for any hint of this kind of thing, for a story I'm planning to write, and while I can ignore discrepencies between, say, actual history and events in my story, my inner scientist won't let me ignore this! The situation is as follows; imagine an early industrial...

Such thing as a "steam panel" for generating energy? Hi, Sort of a hypothetical question here, though I suspect there's some real-world technology like this. I was wondering about a possible way to generate energy using a panel that would catch steam, and use the temperature difference...

hi this is my first post on this forums hope every would help me here on this question Homework Statement outside vertical tube = 1m outside diameter = 80mm exposed to saturated steam at atmosspharic preasure & is maintaiined at 50 c by the flow of cool water through the tube. Rate...