Energy balance Definition and 64 Threads

  1. T

    Energy Balance on heat exchanger

    I need to do an energy balance on a heat exchanger where an aziotropic mixture of 90% methanol and 10% water at 21°C is being heated to 261°C. The heat source is high pressure saturated steam at 31 bar and it is assumed that the steam leaves as condensate at the same pressure (31bar)...
  2. M

    Energy balance in hydraulic cylinder

    hello everyone, In a hydraulic cylinder high amount of load is lifted by applying lower loads in smaller diameter side.. for example, if the diameters of two cylinders is 2cm and 4 cm and i applied a force of 10 N on the 2cm cylinder for 4m downwards. so now the 4cm diameter cylinder could...
  3. L

    Integration of an energy balance equation, with respect to time.

    Hi Guys, I was hoping someone would be able to help me with this integration. It's been killing me haha. I've got this energy balance equation: mgh = 0.5m(v^2) + 0.5I(w^2) + T(theta) Basically, It's a gravitational potential energy that is converted to a velocity of a falling object...
  4. D

    Energy balance in fusion and fission

    I have argued with others on the Talk Polywell forum about the Nuclear Binding Energy per Nucleon vs the Total Nuclear Binding Energy per Nucleus graphs (which is the NBE/Nucleon * the atomic mass number). Despite referenced statements that, while the total binding energy increases continuously...
  5. J

    Thermodynamics Energy balance Equation

    I am going over some thermodynamics right now and I am looking at the energy balance equation which is dE/dt = mdot*j(in) - mdot*j(out) + Qdot + Wdot(external) I understand this means that the change in energy with respect to time equals the sum of the mass energy that goes into a system, minus...
  6. R

    Nozzle Energy Balance: Solving Question B

    Im having difficulty with question b in this problem: [PLAIN]http://img705.imageshack.us/img705/9484/therm.jpg Heres my attempt: m(v1^2)*1/2)+h1)=m(v2^2)*1/2)+h2) + Qout (v1^2)*1/2)+h1)=(v2^2)*1/2)+h2) + Qout where v1 = 200ms^1 and v2 = 40ms^-1 and h1 = 3104.9kj/kg And my answer is 22,000kj/kg...
  7. Z

    Mass & Energy Balance Question Help

    I would appretiate help with the following 2 questions, I think I've got must of the first one right (Or went off t a tangent) but I don't now where to start on the second question 1a) Calculate the flue gas composition if 100 kmol h-1 of a gas whose composition is given below are burnt with...
  8. D

    How Much Power Does a 30m Diameter Windmill Generate?

    Homework Statement In this era of high energy prices, there is a focus on renewable sources of energy such as wind energy. Consider a large windmill 30m in diameter. On a windy day, suppose that the windmill entrains a stream of air 25 m in diameter at a speed of 14 m/s. Downstream of the...
  9. R

    Was Energy Balance Overlooked When Examining Evaporation from Solids?

    I am curious. Maybe I don't understand something, but many articles I come across perform an energy balance on a solid and on a liquid. **I assume evaporation acts on the remaining liquid and not directly on the substrate. Correct?** They always include heat loss due to evaporation as...
  10. P

    Energy balance from mechanical to electrical energy

    A mass is winded via string aroung a flywheel and allowed to fall a specific height before detachement. The flywheel is connected to a small DC motor via gears and starts generating electricity once the mass is allowed to fall.. Now without the DC motor ( generator) the equation of energy...
  11. B

    Energy Balance on a pump with sea water

    My main question in order to solve this problem is...should kinetic energy be neglected? Ok, so here's the problem question: Sea water with a density of rho = 1025 (kg/m^3) flows through a pump of 0.21 (m^3/s). The pump inlet is 0.25 (m) in diameter. At the inlet the pressure is -0.15 (m of...
  12. T

    Material Energy Balance / Thermodynamics Question

    I have this problem as a homework question for my MEB/Thermodynamics class and have been having some trouble with it. A 10.0 m^3 tank contains steam at 275°C and 15.0 bar. The tank and its contents are cooled until the pressure drops to 1.2 bar. Some of the steam condenses in the process...
  13. S

    Earth science, surface energy balance

    Given the equation Q* = QH + QE + QG and the corresponding data (all fluxes in [W/m²]). How can I find the equivalent loss of stored soil liquid water expressed in [mm] (Note: the conversion factor is the density of liquid water, i.e. 1000 kg/m^3) Thanks very much for your help!:confused:
  14. 7

    Energy Balance During Bungy Jumping

    When we are playing bungy jump, we are instantaneous at rest at the bottom(K.E=0). At that time, is elastic P.E. greater than gravitational P.E? :confused:
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