@rotw and @zeusfaber, this statement is considering the fact that all things remaining same,if somehow I am able to reduce the pressure requirement of the process and hence there is a decrease in the discharge pressure requirement, there is scope of power savings.
This was given as a general...
I was reading an article on compressors and came across the following statement : "A reduction in the delivery pressure by 1 bar in a compressor would reduce the power consumption by 6 – 10 %.
What are the underlying calculations and/or the principle behind this result?
This is regarding a fluidised bed coal fired heater (Cap. 10 Mkcal/hr), used to heat thermic fluid, for which I have calculated the following numbers.
As we know, there are two methods to calculate the efficiency, the Direct method, and the Indirect method.
The Calculated values come out as...
@LittleInch, Currently we are looking at the TTs way downstream. I was already working on the CFD plots idea, although was only using google images to illustrate the point. A TT at more than 40D, ( It's inserted horizontally on the pipe side, and that too at an angle to the flow, don't know...
@rotw, this is what I am trying to do now, estimating Q_loss while taking the farthest temperature point.
@LittleInch, yes, the absence of flowmeters renders this method useless. We have the individual temperatures though.
Thanks for the suggestions.
@ hacksaw, I know that, but we cannot change the process without a plant shutdown and the analysis has to be done now.
@rotw, as I stated above, we want to calculate the heat load across the heater to calculate the efficiency. 100 metres down the line would be stable but then it would include...
@georgeverghese, on interchanging the two TTs, the high one begins showing low reading, while the low one shows high. So I guess you are suggesting a poor mixing issue. In that case, please let me know how to calculate the optimum distance of the TT from the mixing point so I do not lose on the...
@rotw, yes they are in the same phase, that's for sure. (Liquid phase) The density difference I'm talking about is the property of the oil at different temperatures (supplied by the manufacturer's lab). And the temperature difference is due to the difference in heating provided by the radiant...
@LittleInch, thanks a lot for these suggestions. I just want to ask something for clarification. What is the basis of the number 80D (the distance of TT from the point of mixing) to be used. Is there some empirical correlation for a given flowrate, reynold's number etc. to be calculated?
Or is...
Thanks a lot for responding @littleInch
Yes, its a simple Tee in a pipe.
The pipe diameters are all same, hence I assume flowrates would also be similar. Its a system where a pipe line splits into two, goes into two different sections of the heater (radiant and convective), and then come out and...
I am currently working on a process where two streams of the same liquid at different temperatures are mixed. There is a temperature indicator at the outlet of the mixing position, however, it shows erranous readings. It is suspected that this is because the two streams have not mixed properly...
