The discussion revolves around a heat exchanger scenario involving a cooling fluid and a condensing fluid, where the condensation occurs at a constant temperature. Participants are exploring how to establish a heat balance when the temperature differential (dT) for the condensing fluid is zero, while it is not for the other fluid.
The conversation is ongoing, with participants sharing their understanding of thermodynamic principles related to phase changes. Some have expressed uncertainty about their knowledge of enthalpy changes and the implications for the heat balance in this context.
One participant notes their limited exposure to thermodynamics, indicating a potential gap in foundational knowledge that may affect their understanding of the problem.
You are aware that enthalpy changes at constant temperature for a phase change of a single component substance, correct? You've heard of the heat of vaporization/condensation, correct?Kqwert said:Homework Statement
If you have a heat exchanger with a cooling fluid and a fluid that condenses, and the fluid condenses over the entire heat exchanger i.e. its temperature is constant. How can one make a heat balance in such a case, when dT is 0 for the condensing fluid but not the other? i.e. (m*Cp*Dt)fluid 1 = (m*Cp*Dt)fluid 2
Homework Equations
The Attempt at a Solution
I wasn't aware that the enthalpy changes at constant temperature for a phase change.Chestermiller said:You are aware that enthalpy changes at constant temperature for a phase change of a single component substance, correct? You've heard of the heat of vaporization/condensation, correct?
Are you taking thermodynamics now, or have you had it yet?Kqwert said:I wasn't aware that the enthalpy changes at constant temperature for a phase change.
I haven´t had it yet. We had a small brief on it in the course I am taking, but maybe I didn't pay enough attention.Chestermiller said:Are you taking thermodynamics now, or have you had it yet?
Well, I'm sure you know that water boils at a constant temperature of 100C while you are adding heat.Kqwert said:I haven´t had it yet. We had a small brief on it in the course I am taking, but maybe I didn't pay enough attention.