Fuel Definition and 581 Threads

So, I've read in books and on Wikipedia (see for instance http://en.wikipedia.org/wiki/Carnot%27s_theorem_%28thermodynamics%29#Applicability_to_fuel_cells_and_batteries) that the Carnot efficiency cannot be applied to a fuel cell because it is not a heat engine that produces work, operating...

Let's say I have a balloon full of Hydrogen that is STP, and outside this balloon I have normal air (containing oxygen) which is also STP. Is there a way to produce energy by turning these 2 items into a fuel cell, if so how practical is it (in a DIY setting) and is there anything that would...

Homework Statement hi I've got to do a project for college and need some direction I want to know a few things more so if you can help let me know. some of the things include (if you could answer any it would be useful): why can't we make a longer electric current to harness all the...

hi I've got to do a project for college and need some direction I want to know a few things more so if you can help let me know. some of the things include (if you could answer any it would be useful): why can't we make a longer electric current to harness all the electricity produced in a...

We want to implement a fuel gauge into one of our field testing equipment. The batteries are Alkaline type. Is there any proven method to calculate the amount of usable charge left? Thanks in Advance Prathap Chandra

It is my belief that as a country we shall all be driving LNG (Liquefied Natural Gas), DI (direct injected), Turbocharged, Plasma ignited cars in the very near future. LNG because of the supply here in the US and the L part (rather than C-Compressed) for range and relative safety. DI...

I'm not sure how much background someone reading this may have so I'm going to go over it kinda thoroughly. In a turbocharged engine, when the turbo compresses air into the intake piping, it heats up and becomes less dense. If the air isn't dense, you can't put as much fuel in so you get less...

1) I need to find the output power in kW of an engine when running a mix of 90% Nitromethane (CH3NO2), and 10% Octane (C8H18), their calorific values are 11.3 MJ/kg and 43.7 MJ/kg respectively. what i know: An engine that runs pure 100% octane with 20% excess air produces 100kW, and the...

Homework Statement A boiler is to produce 6250 kg/h of steam superheated by 40 oC at a pressure of 2.1 MN/m2. The temperature of the feedwater is 50 oC. If the thermal efficiency of the boiler is 70%, how much fuel oil will be consumed in one hour? The calorific value of the fuel oil used is...

Hi, my brother had a insight of making hydrogen fuel cells and begin a business with it. Would that even work ? I am having my doubts.

Dear forum members, I live in Japan and some of my friends got recently quite worried after watching this video: http://www.youtube.com/watch?feature=player_embedded&v=eJi-o4F8eOo It shows an interview with Dr. Hiroaki Koide, talking about the possible consequences of the collapse of the...

So I have been thinking and there's probably a good reason why it doesn't exist already but i'll go ahead and share my idea here on the forums. How about making something similar to the hadron collider but the tube that runs underground is capable of housing the space shuttle. It sits on rail...

Homework Statement I am currently working on a computer science program which calculates the landing of a craft on a given planet. The user will enter in various known variables. I need some direction on what formulas to use for my program. I am strong in computer science however I...

hi all, i want to know that how can i determine the size generator fuel storage tank. let suppose i have 3 generator and which capacity have 635kVA, 1250kVA and 700kVA... and this generator will be operate 85%... so its sum of kVA is 2585kVA and its 85% is 2197kVA and in kW is 1758kW. Now i...

Homework Statement In an engine test the dry exhaust gas analysis is CO2: 5.27%; O2: 13.38%: N2: 81.35%. Assuming that the fuel is a pure hydrocarbon of the form CxHy, and that it is completely burnt, calculate the ratio, by mass, of carbon to hydrogen in the fuel and the air to fuel...

I am going crazy! These websites appear to contradict one another... The lowering of the diaphragm makes the inlet valve of the fuel pump open. With this valve open, fuel is drawn from the gas tank and into the pump. At the same time, the lowering of the diaphragm closes an outlet valve...

The qwustion is: 2 identical cars with their engine rev 2000rpm. The only difference is that car num #1 is in 4th gear and car num #2 is in 3rd. Which car will use more fuel per minute? Considering they are driving on leveled ground. And does it Make a difference if they are going uphill...

Why are usually more wasteful fuel engine at low RPM, as the example image below, 900 RPM more wasteful fuel consumption than 1600 RPM.

. My old car has a plastic fuel filter located between the fuel pump and the carburator fuel inlet. Whatever the engine RPMs are, this filter is only about 40% filled, it is never replete. This happens whatever the filter position is, vertical, horizontal, tilted... Currently the filter is...

Homework Statement A warlock testing a rocket broom takes off from a standing start and flies at fixed elevation. The warlock and fueled rocket system start out with mass Mi. The rocket fires with exhaust speed u, losing mass at a constant rate R, and we’ll assume air drag is negligible. If...

[b]1. Homework Statement [We have a 5 litre rectangular fuel tank which when full of fuel will weigh 3.7kg, I need to simulate the affect off the car pulling 1.5g in the corner by tilting the fuel tank on the lateral and longitudinal axis. What angle would be required to achieve the same affect...

Hi all I saw the posting below in regards to nuclear not being all that its cracked up to be. This is from a scientist in europe. I am intersted in rebuttals. I am pro nuke and just entering the industry but I do not have the experience to shoot this down. Fishing for comments Post...

There is this new electrical device called the Neo Socket Automotive Power Factor Corrector supposedly made by the Japanese company Miraizu that can be plugged into an automotive lighter's electrical socket which can increase the power factor of the AC electrical devices of a car. Power factor...

This is not a perpetual motion machine; the fusion power plant will run out of nuclear power to provide electricity to power it; and this type of transit drive works in theory by having two combustion chambers positioned parallel to the spacecraft 's width and perpendicular to its length. Each...

Homework Statement Hi! I seem to be having some difficulty with this one, any help would be appreciated. There is a car, assume it for simplicity to be a rectangular prism of dimensions l,w and h. The car is moving at a constant velocity v , and assume there is a drag force D = 0.5 \rho...

Well, we really don't need to, but it's nice to have around in case a family emergency requires us to be away from home a bit in the winter. When we bought this place 6 years ago, we bought a tank-full of #2 heating oil. I have supplanted that with 911 fuel-stabilizer a couple of times, and...

nuclear engineers it does seem like it requires types of current nuclear power plants. so what are they and what are the spent fuels? Have A Nice Day!

http://www.ted.com/talks/kirk_sorensen_thorium_an_alternative_nuclear_fuel.html I was impressed by the video; but I was left thinking "What are the downsides?" and "so why haven't we done this already?" - and as such I feel like there's something missing here. Could anyone with more...

Hi all Maybe a juvenile question but throw it out there anyways I know India is heavily vested in thorium due to the abudance in that region. I was wondering why current vendors are not looking to develop a thorium burning reactor to market to these guys or at least a modificaion to...

Originally posted this in the wrong section. What would be the most basic and solid way of doing this for a gasoline engine? I've thought about using a ultrasonic mister but I am afraid that there may be a potential for a spark, don't want to blow up. I've also tossed around the idea of heating...

What would be the most basic and solid way of doing this for a gasoline engine? I've thought about using a ultrasonic mister but I am afraid that there may be a potential for a spark, don't want to blow up. I've also tossed around the idea of heating the fuel to its evaporation temps, but not...

Hello! I don't understand one easy moment in high temp solid oxydes fuel cells (SOFC): 1. Oxygen ions are moving always via solid electrolite ZrO2? SOFC without load and SOFC in short circuit modes. (High temp is default mean) 2. Electrolises process need electric energy and external...

Homework Statement hi guys, i have problem regarding this matters. Products : hydrocarbon if i have this : CO2 - 80% CO - 0.9% O2 - 8.8% N2 - 82.3% 1) how to determine the composition of the fuel? 2) the air fuel ratio? known , the air fuel ratio is : mass of air /...

Fuel cells means chem engineering, right? (move to the right section if necessary) Anyway this sounds great, except that it still uses gasoline: http://www.technologyreview.com/energy/39203/

1) Feed water enters a boiler at 172.52 degrees Celsius. The boiler produces super heated steam at 5600kpa and 472 degrees Celsius. The boiler efficiency is 82%. Find the Heat required by fuel. 2) I interpolated the value given for feed water and super heated steam. h@5600kpa 472 degrees...

I'm given a fuel cell that uses methane as fuel: (CH4) + 2(O2) --> 2(H2O) + (CO2) And I'm asked to find (a) the electrical work I can get out for each mole of methane, and (b) the amount of waste heat produced. I understand that ΔG is defined as the amount of useful non-mechanical work...

Before I started putting it in the reservoir, some fuel came out to the exterior part of the reservoir, and some of it even spilled on the door and the tire. And that tire is flat, because it loses the pressure in some days, so maybe some diesel fuel even went inside it. Is it dangerous to leave...

I'm doing some research into advances in aircraft and need to calculate some (rough) values for aircraft consumption per passenger. The only method I can think of is calculating the maximum fuel weight at maximum payload (Maximum Take Off Weight (MTOW) - Maximum Zero Fuel Weight (MZFW)) and...

Hey everyone, I was just wondering, in a PEM fuel cell the Hydrogen ion diffusion through the membrane is an important step. But don't these ions need to diffuse through the anode as well to reach the membrane? Also, if this is the case and the anode is a metal like Pt, wouldn't the diffusion...

Hi, I am measuring pressure at the bottom of a fuel tank and temp variations are giving me a tough time. I wish to clear my head so here goes my reasoning as temp increases - Tank Volume increases causing - height of fuel to decrease, pressure at the bottom of tank to decrease - Fuel...

Hi Guys this is the problem I am stuck at: The solid fuel of a 420.0 kg rocket traveling at 18100.0 km/hr is ignited to correct the rocket trajectory in mid-flight to Mars. 5.00 kg of fuel is burnt in 13.0 s. If the exhaust velocity of the fuel, relative to the rocket, is 3650.00 km/hr, what...

I have to admit that I've never used this Geewiz and SCALE before, so I'm starting out low here. I'm wondring if anyone has the geewiz help manual available? I get a error when I click help inside the program, and geewiz can't find the file geewizhelp.chm. If there is a short introduction /...

Sorry the title sucks. It's hard to be descriptive about this in a title. I did a cursory check of the other topics and I didn't see this and assumed I probably wouldn't. I get very most basic idea behind rockets, every action with an equal and opposite reaction and all that jazz. Something...

if a rocketship in space is approaching the speed of light and its relative mass is increasing then i assume the fuel mass is increasing which would make it more potent the closer the ship gets to the speed of light which would give it infinite force when the ship reaches the speed of light...

I am trying to determine approximately how much fuel it would take to launch a bi-propellant rocket from Mars and Earth such that they escape each planet's respective gravity. Unfortunately, my orbital mechanics is a little rusty, and the solution I'm getting does not make much sense. Here's...

I recently bought one of those model steam engines, which came with a box of fuel tablets which I can't figure out how to light. I've put them over my cigarette lighter until they snap, crackle, and pop but they just won't catch and my engine won't go. How do you light these things? The box...

Homework Statement The fuel consumption of a river boat is kv3 litres per hour where k is a constant and v km/h is it's speed through the water throughout this question v > 4 km/h. i) determine the fuel consumption for a trip of x km against a current of 4km/h and find the speed at which...

http://www.fueltec.no/" I don't know whether this is the right place to post but I have come across the above website. It seems to be another of these magnetic treatments for improving fuel efficiency. Does anyone have an opinion as to whether it's a goer or just a way of chucking money away...

First of all this is not a perpetual motion machine and is not the previous U Reusable Fuel Transit Drive I designed earlier. This type of transit drive, which doesn't reuse fuel, works in theory by having two combustion chambers and their respective exhaust nozzles positioned parallel to the...

What is the state of the art?