It is generally interesting for the designer to know the variation of these properties at different temperatures within the working range. The knowledge of the next thermal properties (both for the product and the service side) is a requisite for the design of the heat exchanger: density, specific heat, conductivity and viscosity. Thermal properties for the calculation of heat exchangers
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The process is defined when all the features have been fixed by the client, except of one, that will be calculated by means of the above-mentioned thermal balance. In a fluid with a change of phase in saturated conditions (either condensation or evaporation), the heat power depends on the mass flowrate and the enthalpy of the phase change, that is determined by the saturation pressure. The thermal duty of a fluid in liquid state depends on the mass flowrate and the temperature differential between the inlet and outlet sections. In practice, all the thermal duty of the hot fluid (fc) is transferred to the cold fluid (ff), thereby fulfilling the next energy balance: Definition of the process for the calculation of heat exchangersĪ heat exchanger is an energy exchange system (in the form of heat) between a hot and a cold fluid.