Recent content by recreated

It does now, RTW69

Glad it's Friday? I will be if you can help me with this :D : I'm trying to understand an equation about calculating the power extracted by the blades of a wind turbine. I have spent a couple of hours going over it but still not making much more sense. I'm trying to find out why P =...

cheers, I did google it but not in the format you type it and got bad results,, Good thing is I know to use that format you have used. Funny, what ever way i type it in Google now it knows what I mean :D

Excellent Thank you very much, have saved that Common conversion factors pdf as well. Thermal Conductivity was the last piece to this small puzzle and couldn't do anything til I found that.

Dear reader, I thought I was getting the hang of converting units but came across a thermal conductivity value and the unit was given in: BTU/hr-ft-R :eek: I assume the 'R' means 'Rankine'. I want to convert to the SI unit for Thermal Conductivity: W/(m·K) Any ideas? Or if you know where to...

Dear all, I am a bit stuck trying to find out how heat is transferred through an evaporator in a refrigerator. I was using Newton's law of cooling before I realized there are more complexities in the equation as the refrigerant is in a mixture of saturated liquid and saturated gas in the...

Hello everyone Exam tomorrow on thermodynmaics and can only find one advantage for the NTU method of design over the LMTD method which is: The NTU method does not rely on using an numerical iterative solution to find the outlet temperatures of the heat exchanger, which would be the case if...

Yes I have found that equation as well, thank you. Need stronger knowledge of basics as always

Thank you very much, I can solve the problem now. I am still confused about terminology: In the question it says to find 'fluid outlet T' (Tc2), and at first I obtained the oil outlet T (Th2), but realized that 'Fluid temperature' refers to the water T. Is this just a convention in these...

Dear all, Can Torque max. be used instead of Power max. in the bmep equation?-(as shown on attached pic) The name of the equation seems to suggest it is only for Brake Power but hopefully i am wrong. Also, when I do a calculation for bmep for max. Brake Power and max. Torque, the bmep...

Thank you but I don't have the values for Cpc and Cph. I have a 'Cp mean' value. Can I get the unknown values of Cpc and Cph by using the given 'Cp mean' value?

If i can somehow get Cph and Cpc, I must be able to complete the other equations as these are the missing values.

Thank you very much. That has moved me a lot closer to solving. I have all required variables to solve using NTU method except Cph and Cpc. Is it possible to calculate this from the 'Cp mean' value of 2.22 KJ/Kg K?

Not at all. When I said 'I have equations' i meant i have a hand out of derived equations which might not be useful in their current form but i will try my best to give the ones i think are 'meant' to be used. I will give the ones I wrote down on my note pad in class when i was clearly lost as...

Dear All, I am having trouble getting the effectiveness and outlet temperature for counter flow heat exchanger which is described in the attachment below. I already have the answers but do not know what equations to use to get them. I have equations for the effectives and for the outlet...