[TRNSYS-users] Slow model at boiler pressure of 10000kPa

To: "trnsys-users@lists.onebuilding.org" <trnsys-users@lists.onebuilding.org>

Subject: [TRNSYS-users] Slow model at boiler pressure of 10000kPa

From: Amir Nashed <a.nashed@unsw.edu.au>

Date: Mon, 12 Aug 2019 23:56:36 +0000

Accept-language: en-AU, en-US

Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=unsw.edu.au; dmarc=pass action=none header.from=unsw.edu.au; dkim=pass header.d=unsw.edu.au; arc=none

Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=+ooXPrL5u8QDA/DGIQoAICDYXsM0x3t0sZkAM0d9Ba0=; b=W2+6rQgPTo7/9XGcJGkd4H90dCLmoOE4W69gUXbQIysI6Y8H6ONeIYAykhkmValtbIOBjxf0yQr4GAdnWCv9GiIy9x5tSdeOR+LaoeIZWjovS1/kllE+pZm4BfDPmvNuqrelCprOi9XlV2OFwI0VKomK1qlMAsafaHOP2nA11lK7Ar+PEDv35ana0LBUAD3Seg/nCmlJwAsj9x2xfmlEhZ6sbwNPe56MuxfvAM0umlhX6PFQhNIIzgaxehSPxNwJ5vCr3JM5Qj837y8d7TIYLANZBCRxlhokgVpPBy519Q7PzMCVNM867pjy2/WniVTNHBnxVLehNI6KSsVPmjC53g==

Arc-seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=I18Ea7aHN/VcJhIcNwXvSwe4sM/+xCRlXGzIhbfE5XKeMO2+NDExBsuS5e0c8+/FSUxkz42qimAaQucNt8Ob4SXirp/IUv1fPFxMAOSiwjR8Bi30S5A7o3u8kC3nn1srcYalXTC5nns6EfgFaZ6f+vYvCf/Th13uM7Uy45gvvtf5mpFOAujPaCDB1uymXlbSopNsP8KhnBkiChNiMvRzyNJ/UuM18SNyKG2FFeXjJqfMcV0K7CAscbTBv1sf6nlxlPCHW5FwqOi3zdlQNRC+yABboFIox2XilblueOXoeI7hMUs+HnhvMNZUx+HjMEpcpV6ZFDnGcVHES+KqTbpygA==

Authentication-results: spf=none (sender IP is ) smtp.mailfrom=a.nashed@unsw.edu.au;

Delivered-to: trnsys-users-onebuilding.org@pdx1-mailman02.dreamhost.com

Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=unsw.onmicrosoft.com; s=selector2-unsw-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=+ooXPrL5u8QDA/DGIQoAICDYXsM0x3t0sZkAM0d9Ba0=; b=1AAXNElKorDO3P2HZtso6kXaXj3XQ7WhhiFTeiw9CLjoaPaA8zXBmUKad4noomg5j6B3phrxvaTuRsW7omurEac7jDtHQTfe9k1s5G/76Z86QlUn0fgmRO7LUQ+Kfme3sN2jWghhrEyH2eL/aQ/fiBPsmcSSJjVI7Q+pHC3HN8A=

List-archive: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/>

List-help: <mailto:trnsys-users-request@lists.onebuilding.org?subject=help>

List-id: "TRNSYS users mailing list at OneBuilding.org" <trnsys-users-onebuilding.org>

List-post: <mailto:trnsys-users@lists.onebuilding.org>

List-subscribe: <http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org>, <mailto:trnsys-users-request@lists.onebuilding.org?subject=subscribe>

List-unsubscribe: <http://lists.onebuilding.org/options.cgi/trnsys-users-onebuilding.org>, <mailto:trnsys-users-request@lists.onebuilding.org?subject=unsubscribe>

Thread-index: AdVRaFH99dcoY9VRQK+ldjXerxk4Uw==

Thread-topic: Slow model at boiler pressure of 10000kPa

Dear TRNSYS users

For some reason all steam components at P=100 Bar (10,000 kPa) go very slow, whether it is a preheater, condensate pump..etc

The issue is not with the model, as I isolated the components, for example simulated type609 by itself and still did not work. . I believe the reason is the the Steam_Properties() subroutine as when I tried to use Type58 just by itself at the same steam properties, the same issues occurred. When I reduce the pressure to 9300 kPa, it works fine.

Inputs:

Does anyone know how to solve that?

I can change the pressure, but I believe 100 bars for boiler pressure is pretty standard

Best Regards,

Amir Nashed, PhD

Energy Engineer

Estate Management

UNSW SYDNEY NSW 2052 AUSTRALIA

E: a.nashed@unsw.edu.au

T: +61 2 9385 3401

M: +61 4 0597 9282

W: www.estate.unsw.edu.au

CRICOS Provider Code 00098G