Question Regarding Sensible Heat
Question Regarding Sensible Heat
(OP)
I've always learned that sensible heat vs. latent heat was just a difference in temperature change with respect to enthalpy changes, where sensible heat occurs when heat causes temperature to change.
However, I was wondering for a specific fluid: if you had a enthalpy vs. temperature diagram, and you increase the enthalpy of the fluid while keeping constant temperature by changing pressure. If you are outside the two-phase envelope while this enthalpy change occurs, is this still considered sensible heat even though temperature is kept constant?
Or basically: is sensible heat a function of both temperature and pressure and can still be nonzero if temperature change is zero?
Thank you in advance
However, I was wondering for a specific fluid: if you had a enthalpy vs. temperature diagram, and you increase the enthalpy of the fluid while keeping constant temperature by changing pressure. If you are outside the two-phase envelope while this enthalpy change occurs, is this still considered sensible heat even though temperature is kept constant?
Or basically: is sensible heat a function of both temperature and pressure and can still be nonzero if temperature change is zero?
Thank you in advance





RE: Question Regarding Sensible Heat
This is valid for real gas only, where there is a change in Z between the 2 states.
In an ideal gas, dH = 0 when dT=0
For reasons you've described, it is preferable not to use the phrase " sensible heat " in thermodynamics. It is more in common use in heat transfer equipment design where enthalpy changes do not involve pressure changes.
RE: Question Regarding Sensible Heat
I understand dH can be >0 when dT=0 for real gases.
I was wondering in terms of terminology as you mentioned, is this dH still considered "sensible heat" or is there some other terminology to describe it?
RE: Question Regarding Sensible Heat
RE: Question Regarding Sensible Heat
RE: Question Regarding Sensible Heat
RE: Question Regarding Sensible Heat
RE: Question Regarding Sensible Heat
Sensible heat: The heat absorbed or evolved by a asubstance during a change in temperature that is not accompanied by a change of state.
Latent heat: The amount of heat absorbed or evolved by 1 mole, or a unit mass, of a substance during a change of state (such as fusion, sublimation or vaporization) at constant temperature and pressure.