Cycle Definition and 617 Threads

http://white-smoke.wetpaint.com/page/Rotary+Engine does anyone know of this engine being used in production?

I'm trying to resolve some of my conceptual sticking points with the Carnot cycle. For one thing, I'm reading Reiss's Methods of Thermodynamics, and he offers a proof that the Carnot cycle obtains maximum efficiency when conducted reversibly. How can the cycle be conducted reversibly? During...

Consider the following theoretical cycle. There should be a flaw somewhere, but I could not find it yet and will appreciate it if someone can point it out to me. A lot of ideal assumptions are made, such as reversible heat transfer, but it is not intended to be practical, as long as it adheres...

In baseball there's something called "the cycle". It means hitting a single, a double, a triple and a home run in one game. http://sports.yahoo.com/news/mets-hairston-hits-cycle-034749797--mlb.html If I had my way, any sportswriter or announcer who talked about "the cycle" would be...

Homework Statement A Carnot engine operates between 230°C and 120°C, absorbing 6.30*10^4 J per cycle at the higher temperature. What is the efficiency of the engine? Homework Equations eff = 1 - (Tcold/Thot) The Attempt at a Solution Using this equation, I get 47.83 percent...

Proposition: Suppose σ is a cycle of length s. Then σ2 is a cycle if and only if s is odd. Quick remark... The following "proof" seems more like an explanation. This is for a self-study and I am looking back through my notes to refine/correct/improve. If you were correcting this, say out of...

Does anyone can help me in this question? Two reversible heat engines operate in series between a source at 600C and a sink at 30C. If the engines have equal efficiencies and the first rejects 400 kJ to the second, calculate: (i) the temperature at which heat is supplied to the second...

Z diagram and Q cycle ?? (Bad teacher) Hey guys, my teacher told me to review the Z diagram + Q cycle. I'm pretty sure that this means I'm to study Light reactions of Photo synthesis and The Fluid mosiac model. Sound Right? Also this is my first post, so hi :D

Hello All! I am new to the forum and need help. I have looked at multiple sites an looked at 328 threads titles and about 20 actual threads today to find the info I was looking for...no luck. Here is my question: I have a 12.5KW natural gas generator and want to know much heat and I can...

In Carnot cycle we assume that heat addition takes place at constant temperature(temperature of system and source being same) and same is the case for Heat rejection. But as we know that for heat flow (ie heat addition and heat rejection), temperature difference has to be there between system...

Could a "Black Hole" be the cycle of "Dark Matter" powered by "Dar Energy:? Could the "black hole" be like a cycle for "dark matter". So let's say "Dark Energy" is what transports "Dark Matter". So all a black whole is, is a huge amount of energy pulling in "Dark Matter" and pushing it out to...

Homework Statement Prove that a k-cycle in the group Sn has order k. Homework Equations The Attempt at a Solution I'm mostly confused on how to write this in math notation. I know it will have order k because a1 → a2 → a3 ... ak-1 → ak → a1 if we do the compositions K times. and so...

Homework Statement a gas turbine is designed to produce 3000hp when using air at a maximum inlet temperature of 650k and assuming a heat loss of 70 kj/s. if the exhaust temperature is desired to be no greater than 200 degrees celsius, determine the mass flow rate of air required. Homework...

Homework Statement Calculate the efficiency of the heat machine that is shown in the figure. Draw the corresponding Carnot cycle diagram in the S-T plane. Homework Equations \varepsilon = \frac{ \Delta W}{\Delta Q}. \Delta Q = T \Delta S The Attempt at a Solution My problem lies in...

1. Homework Statement given: diesel cycle, P1V1 P2V2 P3V3 P4V4 - all known T1 = 20°c specific heat capacity constant pressure = 1000j/kgk specific gas constant = 287j/kgk compression index = 1.4 2. Homework Equations heres where i am stuck! 3. The Attempt at a Solution Hi...

Is cycle the same as wavelength? Thanks!

Homework Statement p1, V1, T1 and ε (compression ratio) are known I need to find: p2, p3, p4 T2, T3, T4 V2, V3, V4 but I don't know how to find p3, p4, T3, T4 Homework Equations ε = V1 / V2 V1 = V4 V2 = V3 T1 * V1^(k - 1) = T2 * V2^(k - 1) T3 * V3^(k - 1) = T4 *...

Homework Statement A heat engine uses 2 mole of a diatomic gas that follows the pV cycle shown, how much work is done, over the cycle if P=100kPa, T1=207K * P is suppose to be 0.5P this was a typo on the graph This is what I've figured out so far: (if i am incorrect on anything...

Ok, I know there is the argument about switching off/on a geyser versus the leaving it on all day argument, let's argue that for specific set of circumstance I have found out that the turn off method is saving me money. This choice now seems to have me in two minds. 1 is to keep the geyser on...

I have some trouble understanding the carnot cycle and why you have to make it so complicated, i.e. this process involves 2 isothermal and 2 adiabatic processes. If you want an engine with maximum efficiency why can't you just have a system whose temperature is just a tiny inch above your hot...

Problem: The following two-dimensional system of ODEs possesses a limit-cycle solution for certain values of the parameter$a$. What is the nature of the Hopf bifurcation that occurs at the critical value of $a$ and state what the critical value is. $\dot{x}=-y+x(a+x^2+(3/2)y^2)$...

Homework Statement Sinusoidal driving force driving a damped oscillator (mass = m). Natural frequency is assumed to equal the drive frequency = w Time has elapsed to the point any transients have dissipated. Show that the energy dissipated by the damping force [F=-bv] during one cycle is...

Why do we always talk about the Carnot cycle as being the most efficient, ideal engine? Doesn't the same equation hold for any reversible heat engine operating between two thermal reservoirs? Couldn't you prove e = 1-T_{L}/T_{H} for any reversible cycle? And then you can apply the usual "no...

Hi, I want to modify a program that was written long ago. I would like to give the output from hardware as user input. Here, user input deals with current at maximum duty cycle allways. My task is to control the current according to the user input. Let say, if user wants 2kA as O/P and i...

Hi guys, I have difficulties understanding the what I need to do in this problem. I have a ideal refrigeration cycle. first part is standard calculations, work of compressor and such. Results are Temperature range between -23 and 60 degrees C. Second part is the one that i do not understand. it...

I have made an Ottos Cycle graph and found the area Wnet and W12. I now have to find the efficiency η = Wnet/W12 I have found that to be 0,20 but I have no idea what this tells me about the work or anything. I need help.

Hello, I am making some modifications in my programm that had written by someone. it is about a flame machine and AC mains frequency is 50Hz. Now, the program is working for outputting a 20ms continuous flame that means it is quiet clear that it was working at 100% duty cyle(not...

Why can`t coal be the fuel for combined cycle power plants? Why is the succession of Brayton cycle and the Rankine cycle the most common design solution? Why using two Brayton cycles in series, using the lower temperature heat to drive a second gas turbine be a bad idea? Why would efficiency...

I have a question if i have a oscillator pushing 7.8 Hz 144 Hz cycle top (polarity 288 Hz) 432 Hz bottom cycle ... What kind oscillator is this?

Hello, I think it is very basic question and i could not able to figure it out anyhow. I have gone through an instrument material which working at 1000Hz. In that manual specifications, they have written about a setting 'cooling time --> 0-100 cycles'. there are also lot more options...

Homework Statement Find an inversion of the following cycle (143) Homework Equations (143)^{-1} The Attempt at a Solution Could someone show me how do we compute this?

This is a general concern with finding temperature values at different processes in the cycle, however i do have an example i am stuck on, and can post that if needs be. anyway, if i was required to find the flow rate at outlet, which temperatures would i need to put in the SFEE as i know...

Homework Statement http://pds24.egloos.com/pds/201201/22/94/f0095594_4f1af1d126bf3.png [Fusion cycle of the SUN] Show that in the fusion cycle, the energy released is about 30 MeV. Homework Equations The Attempt at a Solution Can you do this without any relevant information!? If you have the...

A question about Thermodynamics, if someone would help with that... I understand a steam engine that follows the Rankine cycle has basically 4 steps: (a) heating in a boiler; (b) expansion on a piston or turbine; (c) condensation; (d) pump back into the boiler. For many years I have been...

Homework Statement A borehole produces 120kg/s of high pressure water at 165°C. A powerplant is to be designed to extract heat from the water, reducing the temp to 147°C. The plant which will initially be assumed to be reversible, will reject heat at 17°C to a river. Take 147°C as the highest...

Homework Statement its part VI) of a big problem, where: 0.12 moles of argon (40) undergoes the cycle abca described in the graph. Process ab lies on a 540k isotherm. In the previious 5 sub problems, i figured that: Tc=270k Qbc=670J (lost) Qca=400J (added) Wab=370J Wabca=100J...

Can anyone please explain schuler cycle, please don not start explaining with same old pendulum with the length of radius of Earth stuff. why is it required ? what is that all about ?

Homework Statement We're considering the following special case of the Duffing oscillator, in the limit of small nonlinearity: \ddot x + x + \epsilon x^3 = 0. The problem asks us to find a conserved quantity, and use it to write the period as an integral. Then, to write it as a power...

Why is this done? Wikipedia says that condensing the steam makes the cycle 'more efficient.' How is it more efficient? Why can't the de-energized steam be transferred to the boiler without condensing it?

let π be a product of disjoint m-cycles. Prove that π is a power of a cycle? So this is like asking show that π = βx for some cycle β and pos. integer x. right? I don't know how to proceed on this except for the fact that the order of π is m. any hints please

An ideal, monatomic gas is going through a 4 step Carnot cycle. Step 1 is an adiabatic expansion. Step 2 is an isothermal expansion. Step 3 is an adiabatic compression. Step 4 is an isothermal compression. The whole cycle is reversible. My question is how would the cycle change if step 1 is done...

Homework Statement A 1.00 mol sample of an ideal monatomic gas is taken through the cycle shown in the figure. The process A B is a reversible isothermal expansion where PA = 5.0 atm, PB = 3.0 atm, VA = 30.0 L, and VB = 50.0 L. (a) Calculate the net work done by the gas. (b)...

Homework Statement An ideal engine operating on the Carnot cycle with a minimum temperature of 25°C develops 20 kW and rejects heat a rate of 12 kW. Calculate the maximum cycle temperature and the required heat supply of the cycle. Homework Equations Qhot/Thot =Qcold/Tcold...

Homework Statement Given an imaginary ideal-gas cycle. Assuming constant heat capacities, show that the thermal efficiency is η = 1 - γ[((V1/V2)-1)/((P3/P2)-1)] Since i can't show you the cycle we are shown that l Qh l = which is absolute value of the heat at high temperature =...

Homework Statement A cogeneration power plant is operating in a thermodynamic cycle at steady state. The plant provides electricity to a community at a rate of 80 MW. The energy discharged from the power plant by heat transfer is denoted by \dot{Q}_{out}. Of this, 70 MW is provided to the...

A changing magnetic field creates a non conservative electric field. If the changing magnetic field is accelerating(2nd derivative in non-zero) the electric field must also be changing. Would this mean that the changing electric field is producing a magnetic field. Depending on the order of...

I have a question concerning the menstrual cycle. Is it possible for someone to bleed from the urethra instead of the vagina? And if so what is the cause? A friend claims that she bleeds the urethra when on her cycle but I to find out if it's true or not.

Homework Statement A mole of ideal gas with a temperature T1=300K is expanded isobarically until its volume is tripled .Then the gas gets colder isochorically until we reach the temperature we had in the beginning 300 K.Find the work of the gas. Hint : We have a thermodynamic cycle . Homework...

Having some trouble understanding if the Kreb cycle is exergonic or endergonic? I know it has to be exergonic because it's releasing ATP?

1. Please help with the following question. Given: A Heat engine goes through a Carnot Cycle as the following states: State 2 to 3: air compresses adiabatically (pressure increasing) State 3 to 4: air expanded under isobaric process State 4 to 1: air goes under adiabatic expansion process...