Recent content by afpskierx

  1. A

    Undergrad Entropy: Heat addition to surrounding.

    If 12007 kJ of heat is lost to the surroundings with an ambient temperature of 25 degrees centigrade during a cooling process, and the ambient temperature of the surroundings is unaffected by the heat addition, what is the entropy change of the surroundings? If Δs=∫δQ/T, then Δs=ΔQ/T=12007...
  2. A

    Graduate Thermodynamics: Unsteady Flow (Charging) Process

    What did you use to look up u2? The only thing we know about it is that its quality is one (it is a saturated vapor).
  3. A

    Graduate Thermodynamics: Unsteady Flow (Charging) Process

    Please see the attached photo. I am not sure how to proceed. I do not know Mi or M2, nor do I have enough information to determine the temperature at point two (when the valve is closed). Any help getting me going along will be much appreciated. :)
  4. A

    Graduate Thermodynamics: Cooling Superheated Water Vapor to Saturated Vapor

    Is it a simple ratio of the Pressure and Temperature at each point? i.e. P1/T1=P2/T2 ?
  5. A

    Graduate Thermodynamics: Cooling Superheated Water Vapor to Saturated Vapor

    Superheated H20 at 400 kPa is slowly cooled in a sealed rigid vessel until the temperature is measured to be 115 centigrade, when condensation first occurs. What is the Initial Temperature? I know that the temperature and pressure at point two (saturated vapor) can be found in a standard...