[Bldg-sim] Secondary variable pump modeling

韩星 foolishstar at 163.com
Wed Oct 26 02:13:33 PDT 2011


Dear Malherek,


Thank you for your advice! It really helped me!
But I still have some questions.
When I use the common pile in the "Plant Loop", the simulation could run. But when I tried to use the "Two-way common pile" as you indicated, errors occur as follows.


   ** Severe  ** While using a two way common pipe there must be a set point in addition to the Plant Supply Outlet node.
   **   ~~~   ** Currently neither plant demand inlet nor plant supply inlet have setpoints.
   **   ~~~   ** Select one of the two nodes and rerun the simulation.
   **   ~~~   ** Occurs for:  PlantLoop=CHW LOOP


Can you please give me a hint?


Thanks!


At 2011-10-25 22:50:54,"Malherek, Elyse" <elyse.malherek at mcquay.com> wrote:


You can look at the EnergyPlus example file called 5ZoneVAV-Pri-SecLoop.idf as a guide for creating a primary-secondary chilled water flow configuration in EnergyPlus.

 

Basically, you just have to have two pumps in the chilled water plant loop: a Pump:VariableSpeed object to represent the secondary loop and a Pump:ConstantSpeed object to represent the primary loop.  And then in the chilled water PlantLoop object, change the Common Pipe Simulation parameter from blank to “TwoWayCommonPipe”

 

You may want to run the example file and look at the .svg output file to see how the plant is arranged and how the node names should match between the various EnergyPlus objects.

 

Use the EngineeringReference document (from the help menu) and search the document for Primary-Secondary to find the section that explains how primary-secondary loops are implemented and controlled in EnergyPlus.

 

Elyse Malherek

Applications Engineer

McQuay International

a member of DAIKIN group

763.553.5379 (Office)

elyse.malherek at mcquay.com

From:bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org]On Behalf Of??
Sent: Tuesday, October 25, 2011 1:18 AM
To: 'bldg'
Subject: [Bldg-sim] Secondary variable pump modeling

 

in the modeling of pump systems, according to 90.1, it should be primary/secondary systems with VSD on the secondary pumping loop.

I wonder how to model this in E+.

Besides, how to know the four coefficients of the variable speed pump? in E+, it is said that the variable speed pump model is described in the ASHRAE secondary HVAC toolkit, but I don't have it. 

Can anybody give me a hint?

Thanks!



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