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  1. S

    Electrostatic Precipitator

    Could anyone point me in the direction of some informative articles and papers relating to Electrostatic Precipitators?
  2. S

    Interpreting a graph of lab data.

    So, I've obtained a graph of lab data an it's a plot of thermal resistance versus pressure. Pressure on the x and thermal resistance on the y. If I plot all the points, there doesn't seem to be any trend. The y values are just as likely to decrease as they are to increase with increasing x...
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    Impact of a Fluid Jet Experiment

    Well, we did take measurements of Q throughout the experiment but that was about it. The first question, verifying the conservation of momentum just seemed to be calculating the Force on the plate via the moment balance and then seeing if this matched $$F = \rho Q (V_1 - V_2cos\theta)$$ Where...
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    Impact of a Fluid Jet Experiment

    Thanks for that. I actually found something in my notes stating that the value of ##C_C## for a nozzle is approximately 1. Is this correct? If so, how would I go about calculating ##C_V##?
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    Impact of a Fluid Jet Experiment

    That isn't the first page of the handout which we were given. I only posted that to show the equipment set up. I'll post all the pages of our actual handout (there's no reference to ##C_V## or ##C_C## anywhere). No, we've never come across these coefficients in class. I looked up ##C_V## and...
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    Impact of a Fluid Jet Experiment

    Homework Statement We recently did an experiment involving the impact of fluid jet on both plane and cupped surfaces. See the diagram attached for the experimental set up. We were asked to 1) verify the conservation of momentum and 2) calculate the discharge coefficient of the nozzle from...
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    Ideas for engineering/physics based MATLAB program.

    I have absolutely do idea how I'd even begin to go about doing that. I've just begun 2nd year Process Eng. so my knowledge of that sort of stuff would be limited. Like I said, it's only to be a very short project. We have 1-2 weeks to do it. Thanks for the input though. Any simpler, less...
  8. S

    Ideas for engineering/physics based MATLAB program.

    Homework Statement So, as part of a numerical methods module that I'm taking I have to write a report and MATLAB program which deals with some sort of engineering/physics based problem. The report essentially just outlines and discusses the problem. It's the initial idea which I'm looking for a...
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    Psychometric chart question.

    Thanks for the reply. RH is the defined as the ratio of partial pressure to saturation partial pressure at a given temperature (multiplied by 100 for a percentage). I could always just use this, knowing the saturation pressure of water at the given temps, to find my final value of RH. I was...
  10. S

    Psychometric chart question.

    Homework Statement The air emerging from a hot aqueous process at a temperature of 45°C, passes over a surface which is gradually cooled. It is found that the first traces of moisture appear on this surface when it is at 40°C. Estimate the relative humidity of the air leaving the dryer...
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    Maximum theoretical and experimental stress in T-beam.

    So, is your first part for the max experimental stress? Like, I find the max stressed area and then divide the maximum load by this? I'm not sure if I follow. Well, the loads act at along the beams length, 350 mm from the ends. So, the bending moment will be -W/2 x 0.35? I've already calculated...
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    Maximum theoretical and experimental stress in T-beam.

    Homework Statement 1. Take dimensions of the beam (B, D, web and flange thickness, L) – T- cross section 2. Take the beam span geometry and material properties from the instrument 3. Ensure the beam and load cell are properly aligned and apply a positive (downward) preload to the beam of...
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    Coefficient Matrix Of Cubic Spline Interpolation.

    Think I've already got it sorted. Thanks for the reply.
  14. S

    Coefficient Matrix Of Cubic Spline Interpolation.

    Homework Statement I'm trying to derive the coefficient matrix (a) of a parabolically terminated cubic spline. This is the matrix of coefficients ##a_i \rightarrow a_n## where n is the number of data points provided. With this matrix you can find all the other coefficients (b and c) that...
  15. S

    Oil and Water Separation

    That'll just be the molar flow rate times the residence time, yes?
  16. S

    Oil and Water Separation

    Homework Statement A fluid which is flowing at 3600 m3/hr, at a pressure of 2.3MPa and a temperature of 75°C is to be separated using a vertical separator vessel. The composition of the fluid is 50% water and 50% oil. 1. Assume perfect separation and a residence time of 20 seconds in the...
  17. S

    Antoine equation and temperature range of flammability

    Actually, what're the Antoine coefficients for Acetone? Each site I've checked has had different values.
  18. S

    Antoine equation and temperature range of flammability

    Thanks for that. Can I find the vapour pressure of the acetone using the Antoine Equation by subbing in for the 3 constants and using room temperature for T? Then, the atmospheric pressure minus the partial pressure of the acetone will be equal to the partial pressure of the air in the...
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    Antoine equation and temperature range of flammability

    Homework Statement A number of accidents have occurred on site as a result if the discharge of static electricity generated by the flow of fluids. You have been asked to review enhanced safety during an acetone drum filling operation. Your engineering manager has asked you to gather some...
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    Using numbers as markers in excel.

    Adding the text box won't work as the data can be changed by the user so the graph points may move, thus moving away from the text boxes. I've tried the second way and that doesn't really do anything. I may not be doing it properly though. Inputting a label in the formula bar doesn't output...
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    Using numbers as markers in excel.

    I'm modelling the Diesel cycle using excel and I'd like to have the 4 different states numbered on my P-v diagram. I can mark these four points using shapes, but I'm not sure how to do it using numbers instead of these markers. Can this be done?
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    Excel inputs.

    Thanks for the reply. I'll read through that and get back to you later on when I get a chance.
  23. S

    Modelling Diesel Cycle in Excel.

    What I'm thinking is that, I'll know my initial and final V/v. Then, if I split that interval up into, let's say, 100 different values of V/v I can use the equation ##P_{intermediate}V_{intermediate}^{\gamma} = P_{Final}V_{Final}^{\gamma}## to find the corresponding values of...
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    Modelling Diesel Cycle in Excel.

    I was only stating that equation to illustrate that when the initial volume isn't known, the rest of the values will have to be calculated specifically. I'll be modelling it using a T-S/s and P-V/v diagram. What equations can I use to find multiple points on each of the process curves? It's...
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    Modelling Diesel Cycle in Excel.

    Homework Statement Construct a Microsoft Excel® spreadsheet that models an internal combustion engine based on the ideal air-standard Diesel cycle. Given the minimum temperature (##T_1##) and pressure (##P_1##) in the cycle, the engine size (##V_1##), the compression ratio (##r_v##), the...
  26. S

    Excel inputs.

    I've never actually written any VBA. Could I implement this in excel just using a few IF statements and functions?
  27. S

    Excel inputs.

    So, I'm a creating a spreadsheet which receives a number of inputs from the user and then does various calculations with these values. The user need only input 2 out of the 4 inputs below and as you can see, with 2 values, the other 2 can be calculated. How do I make it so that excel does this...
  28. S

    HVAC Humidity Question.

    Got it! Thanks a million for all the help.
  29. S

    HVAC Humidity Question.

    I got it. So, would I actually have been able to use the specific volume of the air at 30C and 90%RH and then find the dry air by subtracting the amount of water that was removed? Anyway, thanks for that. Why is it that energy in the water stream was calculated using a 0C as it's initial...
  30. S

    HVAC Humidity Question.

    Actually, I may be completely wrong here but wouldn't it actually be like this: The first heat exchanger is a condenser, used is the one to cool the incoming air from 30C and 90% RH to 6C and 100%RH. So, this incoming air would be at a rate of 1194.74 kg/hr (Calculated earlier, yes?), then the...
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    HVAC Humidity Question.

    Here's the psychometric chart. It may not be fully legible, but you'll be able to make out that there's no reference condition at the top.
  32. S

    HVAC Humidity Question.

    Thanks a million for that. Makes a lot more sense now. However, after looking at my psychometric chart I can't actually see any reference condition. I'll post a picture of it to clarify that. You see, it's not actually set of tables that we've been given. Only one handout of a psychometric chart...
  33. S

    HVAC Humidity Question.

    No problem. Thanks for the reply. Ok, I was reading the values of the wet bulb temp. as the condensation temp. instead of using the dew point temp. I've calculated the values for the amount of water removed/hr as follows: abs humidity @30C and 90%RH = 0.024 kg/kg abs humidity @ 20C and 40%RH =...
  34. S

    HVAC Humidity Question.

    Thanks for that. That and how to read the enthalpy at the saturation temp. from the psychometric charts would be great.
  35. S

    HVAC Humidity Question.

    First of all, the absolute humidity readings are in units of kg/kg. I see what you're saying. How would I calculate the mass of bone dry air present using the conditions (Temp and RH)? And on top of that, how would the amount of water vapour then be calculated? I'm a little slow to catch on...
  36. S

    HVAC Humidity Question.

    I'm a little lost, but I'll give this a go. So, the temperature at which the liquid will condense out at will be the saturation temperature for that given humidity, right? I'll list it below. Are you asking me for the change in enthalpy between the initial conditions (30C and 90%RH) and the...
  37. S

    HVAC Humidity Question.

    Homework Statement A pharmaceutical company operating a tabletting facility in Puerto Rico requires stringent environmental control set at 20°C and 40%RH in order to provide consistent high quality production. The HVAC system is designed to cope with outdoor tropical conditions of 30°C and 90%...
  38. S

    LaTeX Adding an excel graph into a LaTeX pdf.

    Thanks a million for that. Worked perfectly and got the graph looking nice and sharp.
  39. S

    LaTeX Adding an excel graph into a LaTeX pdf.

    Right, so a lot of that was pretty much gibberish to me. I literally downloaded LaTeX yesterday, having no prior knowledge of it before. I've used it got writing this current lab report and I've found it far easier to deal with, and the equations come out brilliantly. But, beyond inputting...
  40. S

    LaTeX Adding an excel graph into a LaTeX pdf.

    Just saw that third my point about gnuplot. I collected the data myself, so the program I use for the graph isn't restricted to excel whatsoever.
  41. S

    LaTeX Adding an excel graph into a LaTeX pdf.

    It's a scatter plot with smooth lines. Is there a more professional alternative to Excel? If so, I'd certainly be interested.
  42. S

    LaTeX Adding an excel graph into a LaTeX pdf.

    I can save the excel graph as a pdf. Following that, I've been able to merge the two pdfs. However, the excel graph shows up as a different size sheet at the end of the merged pdf document. I'd like it to fit on to a normal, vertical A4.
  43. S

    LaTeX Adding an excel graph into a LaTeX pdf.

    How do I go about doing this? I'd like the graph to be fitted to the size of the page (A4) also, not just stuck on at the end in full size.
  44. S

    Flow through a venturi meter (TEL)

    This is a rough sketch of what the lines look like.
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