[Bldg-sim] Perimeter Zones, DOE2.1 & DOE2.2

[Ron Saikowski]

Please remove me from the e-mails. Thank you.

 

Ronald A. Saikowski, PE LEED AP

304 North Main Street, Suite 1

Conroe, Texas 77301

rsaikowski at consolidated.net

Cell 713-252-3729

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Varkie C Thomas
Sent: Thursday, December 11, 2008 4:47 PM
To: Group Bldg-Sim
Subject: [Bldg-sim] Perimeter Zones, DOE2.1 & DOE2.2

 

I assume that the 15 ft perimeter zone depth used in energy analysis is so
that the interior heat gains do not cancel out the envelope heat losses in
winter (when it is say -40 outside).  Design loads programs are not affected
since interior heat gains are not deducted from the heat losses.  Office
Building Envelopes are being designed to have up to 90% glass.  The glass
can be from the bottom of the floor slab to the underside of the next floor
slab.  The ceiling depth next to the glass is zero and it slopes down to
about 3 feet 2 to 5 feet away from the glass.  Day-lighting can now reach 25
ft away from the glass.  Also, when you turn the day-lighting option on, the
lighting load goes down and the heating load goes up.

Can energy analysis programs have perimeter zone depths of up to 25 ft or
equal to the depth of the actual perimeter space (rarely will it be less
than 10 ft and could go up to the core zone) for day-lighting and set
another zone depth of 2 to 5 ft for heating? 

In DOE2.1E I used the following to define the Utility Type for district
steam specified per 1000 lbs & CHW per Ton-Hour. 

  

ENERGY-RESOURCE                             $ EST = 220, LST = 210, 975
btu/lb $ 

   RESOURCE = DISTRICT-STEAM  UNIT-NAME = K-LBS/HR     DEM-UNIT-NAME =
K-LBS/ 

   SOURCE-SITE-EFF = .60      ENERGY/UNIT = 975000   .. 

  

ENERGY-RESOURCE 

   RESOURCE = DISTRICT-CHW    UNIT-NAME = TONS    DEM-UNIT-NAME = TON-HRS 

   SOURCE-SITE-EFF = .90      ENERGY/UNIT = 12000     .. 

  

In DOE2.2 it is UNIT-INDEX and DEM-UNIT-INDEX and the defaults are 50 and 34
for both.  In eQUEST they are called "Energy Billing Units Label" and
"Demand Billing Units Label".  How do I specify the Units since the Utility
Rate Units in different parts of the US and world vary? 

DOE2.2 does not appear to have the DOE2.1E Commands and Keywords for
SPACE-CONDITIONS, ZONE-CONTROL and SYSTEM-CONTROL.  I have used this in
DOE2.1E to set up "Design Criteria" for different types of Spaces (based on
building room types), types of Zones (terminal boxes, etc) and types of
Systems (VAVS, PIU, WLHP - starting with that shown in the DOE2.1E BDL
Summary).  Templates of this type of information can be transferred from one
project to another and edited for the project.  It is similar to the
TRACE700 Project Library. DOE2.2 has SET-DEFAULT that allows master data for
one room, zone and system type.

It is possible that I do not understand the DOE2.2 and eQUEST programs well
enough and I have missed something.  The 6 DOE2.2 Manuals could do with more
examples showing the BDL for modeling PV, GSHP, TES, Load Management, etc.
Case studies would show the full picture.  

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