[Equest-users] Refrigeration Modeling (2) - Zone Load

[Chris Jones]

The equest help files are a subset of the DOE2.2 Manuals.  The 
Dictionary explains most keywords.
http://doe2.com/download/doe-22/

The DOE2Vol pdfs are the manuals I am referring to.



At 02:34 PM 06/08/2012, you wrote:
>Chris, thanks for the help!
>
>I agree with what you are saying, the REFG-ZONE-LOAD is the load the 
>space imparts on the refrigeration case, but that is also the same 
>load the case imparts on the space, hence the 'free cooling'.
>
>Thanks again for confirming the negative number in this keyword!
>
>
>
>Yoni G. Pollak, PE
>(T) 770-622-2270
>
>From: Chris Jones [mailto:cj at enersave.ca]
>Sent: Monday, August 06, 2012 1:52 PM
>To: ypollak at gtp-eng.com; equest-users at lists.onebuilding.org
>Cc: equest-users at lists.onebuilding.org; Curt Hepting
>Subject: RE: [Equest-users] Refrigeration Modeling (2) - Zone Load
>
>I am rethinking my interpretation of the REFG-ZONE-LOAD - I know 
>believe the manual means "the load on the case work due to heat gain 
>from the adjacent space" - the larger ( larger in the negative 
>direction ) the zone load, the move compressor is used.  The 
>reciprocal, heat loss in the space due to the coolness "spilling out 
>of the cases" is not taken into account by the program.  Therefore 
>the larger the negative number, the more there is "heat" in the 
>space and the higher the unmet cooling hours.  Just a guess but if 
>you fix the REFG-ZONE-LOAD and change the space temperature you 
>achieve the same effect - lower the space heating temperature set 
>point, the lower the unmet cooling hours.  If that is the case, then 
>I suspect that the space somehow sees the zone load as increase in 
>heat in the space?
>
>This would indicate that there are other REFG keywords that might 
>influence the heat gain to the space due to the compressor working 
>harder when REFG-ZONE-LOAD is larger.
>
>
>
>At 10:33 AM 06/08/2012, Yoni Pollak wrote:
>
>Chris,
>
>You might be right about that heat ending up in the space, but that 
>doesn't sound right to me.  I was getting an error when REFG-AUK-KW 
>was 0, so I reset it.  I've actually played around with that number 
>quite a bit since it seems to have a large impact on the energy 
>consumption.  I'll revisit it again this morning.
>
>I'm talking aboiut umnet cooling load hours.  The REFG-ZONE-LOAD 
>keyword seems to be directly related to my space loads but in the 
>opposite way I thought.  The more REFG-ZONE-LOAD, the more system 
>cooling the space requires.
>
>
>
>Yoni G. Pollak, PE
>(T) 770-622-2270
>
>From: Chris Jones [ mailto:cj at enersave.ca]
>Sent: Saturday, August 04, 2012 12:15 PM
>To: <mailto:ypollak at gtp-eng.com>ypollak at gtp-eng.com; 
><mailto:equest-users at lists.onebuilding.org>equest-users at lists.onebuilding.org
>Cc: 
><mailto:equest-users at lists.onebuilding.org>equest-users at lists.onebuilding.org
>Subject: Re: [Equest-users] Refrigeration Modeling (2) - Zone Load
>
>There are a number of other REFG- keywords that depend on 
>REFG-ZONE-LOAD.  For example:
>REFG-AUK-KW - takes three entries (order corresponds to 
>REFG-ZONE-LOAD) of the fractional rated capacity of lights, fans, 
>anti-sweat heaters - the default is 40% of the REFG-ZONE-LOAD - I am 
>not entirely sure but I believe this heat ends up in the space.
>
>Also, do you mean the unmet load hours are cooling load unmet or 
>heating load unmet?
>
>
>
>At 10:21 AM 03/08/2012, Yoni Pollak wrote:
>
>Content-Type: multipart/alternative;
>          boundary="----=_NextPart_000_0096_01CD7161.C28847D0"
>Content-Language: en-us
>
>Hi All,
>
>Has anyone had experience modeling refrigeration cases?  I posted a 
>question the other day but this one is different.
>
>So under Air-Side HVAC Zone Parameters > Refrigeration Tab, Zone 
>Load (REFG-ZONE-LOAD) I entered the free cooling affect from the 
>refrigeration cases to the space (as described in the key word 
>help).  But looking at the SIM file, this parameter is increasing my 
>zone loads rather than decreasing them, and in fact is causing my 
>space to have more unmet load hours.  Should I apply a negative 
>number to this parameter, or is this parameter not the 'free cooling' affect.
>
>
>That along with the Walkin Box Load under the Air-Side HVAC System 
>Parameter.  Not sure how the program is using this value.
>
>Thanks!
>
>
>
>
>Yoni G. Pollak, P.E.
>Mechanical Engineer
>
>GTP Consulting Engineers, Inc
>4197 Pleasant Hill Rd
>Suite 200
>Duluth, GA 30096
>(770) 622-2270
><mailto:ypollak at gtp-eng.com>ypollak at gtp-eng.com
>
>
>
>
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> >>
>Christopher Jones, P.Eng.
>Suite 1801, 1 Yonge Street
>Toronto, ON M5E1W7
>Tel. 416-203-7465
>Fax. 416-946-1005
>email <mailto:cj at enersave.ca>cj at enersave.ca
>
> >>
>Christopher Jones, P.Eng.
>Suite 1801, 1 Yonge Street
>Toronto, ON M5E1W7
>Tel. 416-203-7465
>Fax. 416-946-1005
>email <mailto:cj at enersave.ca>cj at enersave.ca

 >>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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