Nonetheless, a comparison of overall heat transfer coefficients is given in Table . The values collected for this table from Peters (2003) and Douglas (1988) are selected to represent ORC evaporators or condensers, which is heat exchanged between a phase-changing organic fluid and water. Additionally, a typical water-water heat exchange value is shown. Water-Water 2000 Peters (2003) describes their overall heat transfer coefficients as being based on results from "ordinary engineering practice." Additionally, they appear conservatively smaller than most shell and tube values. The GETEM value is larger than most phase change process values and a smaller value should be used for ORC condensers/evaporators. Thus, Peters (2003) overall heat transfer coefficient ranges are adopted in genGEO. We additionally propose two average values in Table for water-organic and water-water heat transfer, although these should be used carefully.