Heat exchanger issues
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When a heat exchanger uses water or steam as the cooling or heating medium to exchange heat with organic substances, which equation is appropriate? NRTL? Thank you
The calculation of heat exchangers is independent of the equations used; the equations in question are actually used to calculate the properties of materials. When calculating heat exchangers, software needs to rely on data related to these materials, such as specific heat and viscosity, and these properties are determined using equation of state or activity coefficient equations.
Reply to 1# huchang417: For water or water vapor, \"steam\" seems to be a better choice. For organic substances, it’s necessary to consider their specific composition as well as factors such as pressure and temperature in order to select the appropriate property evaluation method
Thank you for your guidance, experts. I have another question: when it comes to heat exchange between organic substances and water, which equation should be used? Is it sufficient to consider the composition of the organic substance, as well as properties such as temperature and pressure?
It is sufficient to specify the fluid properties directly.
In ASPEN HTFS+, it is possible to specify the property calculation methods for cold and hot streams separately. For example, STEAM-TA is used for water (on the steam side), while BWRS is used for organic substances.