With the release of HTRI Xchanger Suite 4.0, HTRI has implemented the Unit Operations portion of the CAPE-OPEN 1.0 interface specification. With this interface, users of the HTRI software can embed shell-and-tube heat exchangers (Xist), air-cooled exchangers and heat recovery bundles (Xace), and plate-and-frame heat exchangers (Xphe) into CAPE-OPEN compliant process simulators. This interface allows users to exploit the full power of the rigorous HTRI exchanger models directly in their process modeling workflow. The CAPE-OPEN interface allows access to the Xchanger Suite interface from within the process simulator environment.