Recent content by mecheng

  1. M

    What is the boiling point of Steel?

    Thanks everyone for this wonerful response. I'll assume that steel would boil around 2900C.
  2. M

    What is the boiling point of Steel?

    I'have searched a lot but could not find boiling point for steel. Can you tell me what's the boiling point of steel? Also any link for a table which provides both melting and boiling points for commonly used metals would be greatly appreciated. Here is what I found so far: Melting Point: The...
  3. M

    Crystal Structure: Properties of Materials Depend on Structure

    Which properties of materials depend on the crystal structure (f.c.c., b.c.c. cph etc...) of materials?
  4. M

    Stress-Strain Diagrams: Comparing Cast Iron & Stainless Steel

    How the stress-strain diagram of Cast Iron differs from that of Stailless Steel? If someone can post a link of a website from where I can find stress-strain diagrams of different materials, it would be very helpful for me. Thanks in advance!
  5. M

    A couple of questions on Gas/Steam turbines.

    Thanks Astronuc! Your reply was quiet helpful. One more question regarding the CCPP. Q. Is there any technical difference between HRSG (Heat Recovery Steam Generator) and Steam Generator/Boiler (used in Steam Power Plants)?
  6. M

    A couple of questions on Gas/Steam turbines.

    In Gas Power Plants, two types of compressors are used. 1. Axial Flow (Rotary) 2. Centrifugal Is it possible to use a reciprocating compressor in Gas Power Plants?
  7. M

    A couple of questions on Gas/Steam turbines.

    1. Why Gas turbines are placed in open atmosphere while steam turbines under roof in Combined Cycle Power Plant? 2. What are the reasons for not using the reciprocating compressors with Gas turbines other than mass flow rate? Thanks in advance!
  8. M

    What is the significance of pursuing reversibility in power plant processes?

    Yes, this is exactly what I'm doing these days. For Rankine Cycle I'm using T-s diagram which is most commonly used. My engineering classes have just been started and Thermodynamics is the subject which I've found most interesting. But I have not yet been able to fully understand the concept...
  9. M

    What is the significance of pursuing reversibility in power plant processes?

    Thanks Clausius2 for the correction! Heat addition 'isentropically' --- really sounds stupid. Actually I was to say 'isobarically'. In Boiler (Evaporator) and Condenser heat addition and rejection processes are carried out both isothermally and isobarically (ideally of-course). But in...
  10. M

    What is the significance of pursuing reversibility in power plant processes?

    Thanks russ_watters! Even in Rankine Cycle heat addition and rejection processes are carried out in isothermal conditions, except for Economizer and Superheater where heat is added isentropically (ideally). So another question; "Why heat addition and rejection processes are preferred at...
  11. M

    What is the significance of pursuing reversibility in power plant processes?

    Carnot Cycle is the ideal heat engine cycle with maximum efficiency. We use Rankine Cycle as the working cycle for steam power plant which has significantly lower efficiency that Carnot Cycle. My question is why we don't adopt Carnot Cycle as ideal Steam Power Plant cycle? Thanks in advance!