[esp-r] Re: Modeling HVAC power demand by seconds

[Jeremy Cockroft]

We have been running domestic building models with one minute time step, with detailed plant and controls modelling with 5 seconds time step.  We want to be sure to capture dynamic aspects of control system behaviour.  You might not want to write out results for every time step though.


Jeremy Cockroft

University of Strathclyde

The University of Strathclyde is a charitable body, registered in Scotland, with registration number SC015263

________________________________
From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Max Epstein
Sent: 06 July 2010 20:04
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] Modeling HVAC power demand by seconds

Hello, I would like to model commercial building HVAC operation and especially power demand at a 2-10 second time-step. I read about ESP-r on eere.energy.gov (US) that: "Building and flow simulations can be undertaken at frequencies of one minute to one hour and system simulations can be from fractions of a second to an hour." Does this mean power demand data can be output/recorded as fast as every 2-10 seconds?

Also, can thermostat setpoint adjustments be made dynamically while the simulation is running in response to changing building conditions? Or can many 10second (duration) simulations be strung together and automated with dynamic thermostat setpoints implemented in between, according to predetermined logic and evolving building conditions?

I read on ESP-r's capabilities page that modules can be driven by scripts to automate tasks. Could you please elaborate on that functionality in regards to the potential for modeling a building with dynamic thermostat setpoint adjustments every 2-10 seconds, or at least every minute?

Any help would be much appreciated, thanks for your time.

Max Epstein


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