# Heat exchanger, condensation

## 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

## The Attempt at a Solution

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Chestermiller
Mentor

## 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

## The Attempt at a Solution

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?

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?
I wasn't aware that the enthalpy changes at constant temperature for a phase change.

Chestermiller
Mentor
I wasn't aware that the enthalpy changes at constant temperature for a phase change.
Are you taking thermodynamics now, or have you had it yet?

Are you taking thermodynamics now, or have you had it yet?
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
Mentor
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.
Well, I'm sure you know that water boils at a constant temperature of 100C while you are adding heat.