[Bldg-sim] Basic Questions

[Andy Tindale]

Hi Kurt,

I can answer your question 2 on the CoP of 0.8 entered in DesignBuilder. When using "Simple" HVAC in DesignBuilder terminology, the EnergyPlus "Ideal loads" air system is used in the IDF data. The Heating CoP of 0.8 you entered in DesignBuilder is used to multiply up the loads calculated by EnergyPlus to meet the heating setpoint temperature. So the value of 0.8 doesn't appear in the IDF data but is used internally by DesignBuilder. 

The "Ideal loads" heating system heating loads are reported as "District heating" end use in the EnergyPlus output reports.

Regards,

Andy

Andy Tindale
DesignBuilder Software ltd
www.designbuilder.com
Tel: +44 (0)1453 755500


-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Kurt Creamer
Sent: 11 September 2011 17:26
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Basic Questions

Hi all,

I had a couple of questions I was hoping to get some help with:

1.  What is the difference between a "Facility" and a "Building" in
EnergyPlus?  I created a very simple building in EnergyPlus and am seeing a
large difference between the facility electricity usage and building
electricity usage.  I have not outdoor lighting.  What would be included in
facility usage that would not be included in building usage?

2.  I created the building referenced above with DesignBuilder, choosing an
LPG heating system with a COP of 0.8.  I wanted to do some further
manipulation in EnergyPlus so I exported the file as an IDF file.  In doing
so, it looks like the heating system was modeled as an Ideal Loads Air
System.    If I understand this Ideal Loads Air System correctly, the load
calculated in EnergyPlus is simply the amount of heating energy output
required for heating purposes, and does not utilize the COP I entered in
DesignBuilder -- is that correct?

3.  I can select the Ideal Loads Air Heating Energy as a variable to be
output in the *.csv file of all the variables, but cannot get it to appear
in the meter file.  After the run, "HVAC,Sum,Ideal Loads Air Heating Energy
[J]" shows up in the *.RDD file but not the *.MDD file.  Is there a way to
make this info show up in a meter file?

4.  Is there an easy way to set up a meter that would simply mimic a natural
gas or propane bill that simply shows therms or gallons?

Thanks,
Kurt Creamer
Apex, NC


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