vacuum -vapor pressure characeterastics

Your problem needs better definition before any answer is possible. Suggest you find a chemical or mechanical engineer experienced in heat transfer and condensation operations. Failing that, Q=M*Cp*dT + M * dH

Q = heat to be removed (sensible plus latent).

M = mass flow

Cp = heat capacity at constant pressure

dT = temperature change

dH = heat of vaporization at the condensing temperature/pressure.

Q removed from the process stream must equal Q going into the chilled water.

So, chilled water temp inlet temp is dictated by chilled water flow, heat exchanger design, and heat load.

It is also dictated by heat exchanger design where Q=UAdT

U= overall heat transfer coefficient

A=area

dT = temperature difference between the two sides--and is not a constant. Suggest using log mean dT (lmDt).

Refer to the chemical engineers handbook to calculate ore estimate heat transfer coefficients.

Welcome to the forum.

There is a linear relationship between the natural log P and 1/T (Kelvin). So, if you have the vapor pressure and temperature at 2 points, you can plot a line through the two points and get the vapor pressure at any other point.

Tad