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  1. kmuhsen

    Pressurization time

    from ideal gase equation ( if applicable depending on the pressure) P-final x v-final = m RT v : specific volume could be calculated. by calculating the vessel size you can get the total mass ( M) of air charged into the vessel. Assuming steady flow conditions Time = M / ( rate of flow) Bye...
  2. kmuhsen

    TURBINE SHAFT SPEED?

    Hello The amount of energy which is consumed in the turbine depends on the turbine RPM, Tourque applied to the turbine's shaft in addition to turbine's efficiency, so if you change inlet pressure this will lead to a change in input power, assuming that the turbine efficiency and toruque applied...
  3. kmuhsen

    Training centre mechanical room

    Hello <br><br>you can solve the first proplem by using a fan which driven by a variable speed frequency driver.<br>This can reduce the fan speed when the air pressure in the return duct increased.<br>i beleive both the first and the second problem could be solved by this...
  4. kmuhsen

    Batch tank steam heating

    Hello <br><br>Armstrong pumps have a software for steam tanks heater, they can send you a copy free of charge.<br><br>you can contact them through <A HREF="http://www.armstrongpumps.com" TARGET="_new">www.armstrongpumps.com</A><br><br>regards,<br><br>Khaled Muhsen
  5. kmuhsen

    creating entorphy

    Entropy is astatiscal thermodynamics property comes out from various thermodynamics processes in the world, it is generated due to heat(work) exchange between systems and surroundings, refering to 2nd low of thermodynamics we found that the nett entropy between system and surroundings is always...
  6. kmuhsen

    Vibration Engineer

    I would reccomend &quot;THEORY OF VIBRATION WITH APPLICATIONS&quot; for William T. Thomas<br><br>BYYY
  7. kmuhsen

    Vibration Parameters ?

    If we are talking about forced harmonic viberation like the unbalance in rotating macinery then factors are:<br>1-Frequency<br>2-Amplitude<br>3-Natural frequency<br>4-Damping factor<br>5-Harmonic excitation force<br><br>I hope the above helpful,<br><br>BYYYY
  8. kmuhsen

    Thermal expansion for Stainless & Carbon

    Yes there is, please look to results as per herunder schedule:<br><br>Temperature&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E3<br>200...
  9. kmuhsen

    corrosion & water flow patterns

    Hi <br>If we are talking about the corrosion which is due to friction between water boundary layer and boat body, then you have to find the water boundary lyer velocity profile over the boat body, then apply Newton low of viscosity (T= M x dv\dn )Where :<br>T:Shear stress<br>M: water...
  10. kmuhsen

    Measuring moment of inertia

    I am sorry bescause i did not mention in my first reply that mesuring should be done in aprrox. vacume conditions.<br><br>good luck,
  11. kmuhsen

    Measuring moment of inertia

    Hello<br>You can do that by mesuring the electrical absorbed power from the fan motor which is equal P = I x V<br>where I : current (A)<br>V: Voltage (V)<br><br>Theoritacly most of this power converted to mechanical power which is P = 1/2 x I&quot; x w^2<br>&nbsp;Where I&quot; : moment of...
  12. kmuhsen

    HVAC Sizing

    You can buy ASHRAE fundemental volume which icludes all information you might need in your design.<br>Please visit <A HREF="http://www.ashrae.org" TARGET="_new">www.ashrae.org</A> to get information how to buy these books
  13. kmuhsen

    design of a motor

    Firstly you have to specify either if you want to pull the weight over a straight or inclind surface as the pull force will be changed depending on the slope angle.<br><br>once you you find the pull force [F]which is equal to friction force[mass x g x cos (slope angle)x friction coefficiet]plus...
  14. kmuhsen

    Control Valves

    Most of butterfly valves ahve a poor throttling performane comparing with globe valves, but what makes people specify butterfly because it is easy to fix a control actuator for automatic control which is hard to do in the case of using globe valves in addition to space saving.
  15. kmuhsen

    Piping network

    Hello there<br> My name is Khaled Muhsen from Jordan( Middle East)<br> you can down load a simple software free from the following site : <A HREF="http://www.RITZ-pumpen.de" TARGET="_new">www.RITZ-pumpen.de</A><br> <br> I trust the above is helpful,<br> <br> Byyyy<br> <br> Khaled Muhsen<br>...
  16. kmuhsen

    Variable speed drive motors

    If a big motor is controlled by vraiable speed driver, does it need a soft start control like star-delta. please advise
  17. kmuhsen

    Piping network

    I beleive CRANE valves company do have one
  18. kmuhsen

    pressure drop calculation for compressible flow

    I will give you some guides using Darcy's formula to get abetter accuracy, these notes actualy based on the persure drop value:<br> 1-If the pressure drop (P1 - P2) is about 10% of the inlet pressure P1 then you can use Darcy's by getting fluid properties either upstream or downstream...
  19. kmuhsen

    Mass Flow Rate

    First you need to find the inlet density for air, you can get this from ideal gas low : Pv = M x R x T<br> <br> then you can get the mass flow rate staight away from :<br> <br> Mass flowrate = Area x velocity x density<br> <br> i hope this helpful<br> <br> Khaled Muhsen
  20. kmuhsen

    Swing Check Valve

    Below a general formula that can be used to determine the minimum velocity necessary to hold the check valve in awide open stable position :<br> <br> v = 45 x ( V )^0.5<br> <br> v : velocity in (m\s)<br> V : specific volume of the fluid in (m^3 / kg)<br> <br> I hope this helpful<br> <br> Khaled...

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