[BLDG-SIM] WLHPs and Hot Water

[Mike Tillou]

I was going to recommend the same idea.  

Create a boiler on the WLHP and determine the unmet heating load that is
not met by the heat pumps.  Capture this load in an hourly report and
import it into excel (you can create an output report that imports
directly into excel).  Find the peak hourly MBTU unmet heating load.
Determine the ratio of unmet heating load to peak unmet heating load for
each hour of the year.  Create a schedule TYPE=FRACTION using these
ratio values (52 weeks, 365 days).  In your hot water loop (with the
boilers) assign a process heating load equal to the peak unmet heating
load, use the schedule you created as the process heating schedule.  

You can verify this is working right by running hourly reports comparing
the WLHP boiler load and the process load.  Set the HIR of the WLHP
boiler and the kW of the WLHP boiler pump to 0 so that you don't get any
unmet heating hours in your air-side systems output (for the heat pump
systems).  


Good Luck,


Mike


Michael Tillou, PE
etc Group, Inc.
PO Box 7, Williamstown, MA 01267
ph. (413) 458-9870  fx. (413) 458-9875
www.etcgrp.com
  


-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com] On Behalf Of John
Aulbach
Sent: Thursday, June 16, 2005 12:37 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] WLHPs and Hot Water


Wade:

This may the "old fashioned" method, but...

Can't you run the WSHP scenario with a gas fired
boiler, assuming a 100% boiler efficiency (horrors!),
and get an 8,760 hourly output on the dynamics of that
boiler?

Then, input this dynamic heating load (AS A HEATING
LOAD) into another eQuest run for the rest of your
loads and main boilers, thus hopefully getting the
dynamics you need.

At least the theory feels right...


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