thermo exam 2 Flashcards
Diffuser
is an adiabatic device that decrease kinetic energy of a fluid by slowing it down. the lost kinetic energy is mostly converted to internal energy and changes the fluid temp
Nozzle
kinetic energy increases by decreasing the fluid temperature
turbine
the work output has to be equal to the decrease in energy flowing through it
compressor
throttling device
used in A/C and refrigerators large temp drop in these devices. requires a phase change for the temperature to change
if an ideal gas goes through a throttling deivce at steady flow
h remains constant so the temperature stays the same
heat exchanger
mixing chamber
1 Kpa*m3
1 kJ or 1(kN/m2)m3 or 1 kNm
for an ideal gas what is cp’s and cv’s relationship with pressure
it does not vary with pressure
Cp’s relationship with temperature
it varies with temperature
polytropic process
Pv^n =Constant
saturated vapor
about to condense
superheated vapor
not about to condense
saturated liquid
about to vaporize
