RE: [EnergyPlus_Support] Simulation Time

To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>

Subject: RE: [EnergyPlus_Support] Simulation Time

Date: Thu, 25 Jul 2013 21:53:01 +0000

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Thread-topic: [EnergyPlus_Support] Simulation Time

Hey, this is my favourite topic!

Touraj, do you know which i7 processor you have in your laptop? Whichever it is, I bet that I can cut the simulation time by half if you convert your model to v8 and send it to my i7 desktop. You can do that by getting the latest JESS Client from http://www.iesd.dmu.ac.uk/~jeplus/wiki/doku.php?id=jeplusplus:download. I will then send you the address of my desktop with a passcode.

Cheers,

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of rahul a
Sent: 25 July 2013 21:33
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Simulation Time

You might want to look at the error file for recurring errors. Look for warnings starting with "SimHVAC." If HVAC loops don't converge then it might add to simulation time. Here's what the error looks like:

SimHVAC: Maximum iterations (25) exceeded for all HVAC loops, at SALEM OR USA TMY2-24232 WMO#=726940, 02/05 10:50 - 10:55

This usually means two or more components or setpoint managers are fighting with each other.

Also, if you have a big model, and it looks like you do, then more zones can sometimes result in lower simulation times. This is because if a single zone has a large number of surfaces, it takes longer to solve than more zones with fewer surfaces per zone.

Rahul

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