6/16/2019 AspenTech: Knowledge Base How do I plot an envelope on a wet basis? Products: Aspen HYSYS Last Updated: 20-Jan-2017 Versions: Multiple, V7.0, V7.1, V7.2, V7.3, V8.0, V8.2, V8.3, V8.4, V8.6, V8.8, V9.0 Article ID: 000029508 Primary Subject: Utilities Attachments (1) Add Favorite Converted from "109322_Default.txt" Applicable Version(s): Applies to HYSYS Versions 2.0 - Current Problem Statement: How do I plot an envelope on a wet basis? Solution: [NOTE: This only works if the stream is two phase. If there is enough water to give a separate aqueous phase, then this approach does not plot a full 3phase envelope because the vf=1 ashes are not enough to distinguish between water and HC dewpoints.] You can use the Property Table utility to generate such a plot. Go to the Attachment tab page of the stream and attach a Property Table utility. Independent Variable 1: Vapor Fraction, Mode: State, State Values: 0 and 1 Independent Variable 2: Pressure, Mode: Incremental, specify upper and lower pressure and number of increments. Dependent Variable: Temperature Calculate and look at the plot! Please note that the range of your P-T plot should be away from the critical condition of the stream. Not like the Envelope utility where special treatment is applied to assure the closure of the phase envelope at the critical point, the dew point and bubble point curves generated in a Property Table utility would not necessarily overlap at the critical point. Another issue to be aware of is that the property table may have some trouble at the points in the curve where the discontinuity occurs, such as in the retrograde region. Keywords: phase envelope, wet basis, dry basis, retrograde, P-T plot https://esupport.aspentech.com/S_Article?id=000029508 1/4 6/16/2019 AspenTech: Knowledge Base Rate this article: Comments Submit Comment Attachments Filename Date Added Envelope using property table.HSC (/FileAttachment?id=a0g0B00000GfL3c) 18-Jan-2017 (http://www.aspentech.com) Training Training Center (T_Homepage) Call Training (/Contact_Phone) Email Training Chat with Training Training Service Partners (https://home.aspentech.com/en/partners/work-with-apartner#TSP) Find a Class Register for Classroom Training (T_Homepage?Type=ClassRoom#ClassSearch) Register for Virtual Training (T_Homepage?Type=Virtual#ClassSearch) https://esupport.aspentech.com/S_Article?id=000029508 2/4 6/16/2019 AspenTech: Knowledge Base Request Private or Customized Training (T_OnsiteTrainingRequest) Curriculum Download Course Catalog (https://www.aspentech.com/en/-/media/aspentech/home/customerhelp/aspentech-course-catalog-fy18.pdf?la=en) Browse Course Descriptions (T_CourseCatalog) View Curriculum Maps (T_Curriculum) News & Events Customer Reviews (https://www.aspentech.com/customer-help/testimonials) Webinars (https://www.aspentech.com/en/events-listing) Support Support Center (S_Homepage) Call Support (/Contact_Phone) Email Support Chat with Support About Support Support Overview (S_Resources) Support Managers (S_Managers) Feedback (S_Survey?type=web) Find the Answer Knowledge Search (S_KnowledgeSearch) Product Documentation (S_Homepage#productDocumentation) Supported Platform (https://home.aspentech.com/platform-support) e-Bulletin (S_ebulletin) Product Lifecycle Policy (S_ProductLifecyclePolicy) Submit a Case Submit Online (S_CaseSubmit) Submit via Chat (S_ChatOpener) Call Us (/Contact_Phone) Email Us Track Cases (S_TrackCase) https://esupport.aspentech.com/S_Article?id=000029508 3/4 6/16/2019 AspenTech: Knowledge Base Downloads Product Patches (S_Homepage#productPatches) Download Center (S_DownloadCenter) Software & Patches (https://support.aspentech.com/aspenoneupdates/) Software Services Order Upgrades (S_MediaUpgrade) Request License Keys (S_LicenseRequest) Software Evaluation (S_SoftwareEvaluation) University Order (S_UniversityOrderLanding) Return Merchandise (S_ReturnMerchandise) Upload Usage Logs (S_SLM) My Pro le Update My Pro le (S_MyPro le) My Training (S_MyTraining) My Favorites (S_myfavkb) © 1994- 2019, Aspen Technology, Inc. All rights reserved. Privacy Policy (https://www.aspentech.com/Privacy-and-Security/) https://esupport.aspentech.com/S_Article?id=000029508 4/4
