Recent content by pchoopanya

Hi gnurf, This is so clear. I not get it. Thank you so much

Hello there, I am so confused about the term battery specific energy (in Wh/kg) and specific power (in W/kg) Actually, I know what it means by power and energy, of course P = E/t But looking at the text, which quotes like "Ni-Cd batteries have high specific energy (than Ld-acid) but...

Morning from UK berkeman, Well, the reason why the power is negative comes from the attached equation, By knowing a specific driving cycle (velocity profile against time), in this case, I'm using a Bangkok drive cycle (Thailand), the remaining variables are already known, I could then work...

My apology, I have re-arranged my questions so that you guys can see more easily what actually I am trying to do; Please see the attached picture; These are 4 examples of 4 different drive cycles (vehicle speed VS time) From that, using simple longitudinal linear dynamic equation...

I will show you the power plot against time As you can see the power curve does not have a pattern at all

Hi, thank you for telling me Here again.

Hello, I need to work out the average load power which is expressed by the equation attached; I am not sure about how I can do this, I am so dumb at calculus. M, g, fr, \rho, CD, Af, \delta and T are one single constant However, V which stands for velocity varies with time, T or t...

1. The original bus (diesel engine) deliveres 170 kW of maximum power 2. But this whole powertrain is to be replaced by a hybrid fuel cell/battery electric powertrain 3. The bus is to be operating in Bangkok, Thailand. So, for each one round trip, without re-fuelling between the rout, it...

Hello, I am in the beginning of sizing all the components in the powertrain and really need your help; I am trying to size the motor for a hybrid eletric bus All articles I have read so far mention one lengthy equation that to know the rated power of the motor, one mush use; PEM =...

Hello, I know this is rude but I do have the same kind of project which is to propose the powertrain design of an electric bus. I am kind of lost, do not where to start. Of course, I have read so many articles though. So I think I have some background knowledge, but I just want someone...

I wish I had seen this series before I took my EFM... T_T

Hi again, Can anyone give me a clue on what the simulation or modelling actually mean? As the above thread, I do not understand what I am supposed to do in the simulation, what would I get from it? Thank you very much

Hello again, Topher925 I know this sounds really stupid, but could you please guide me what it means by "MODEL" or "SIMULATION"? I have heard of these words many times but no one can actually clarify what they mean exactly. So, in terms of modelling a bus or any sub-system, what text...

Yes, since this project is specifically aimed at my country, Thailand-specific objective. I have decided that a natural gas, NGV will be used. From what I have researhed through literatures, seems like it a good fuel, isn't it? It is cleaner than dielsel or petrol, gives more...

Topher925, Really appreciated your answers, they even clarify some more questions I am about to ask! Yeah, I was not so convinced when choosing the 1st one, but now I am pretty sure with the 1st layout with your fact "SOFC is not good at transient power requirement". May I ask you guys...