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

[Chris Jones]

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: ypollak at gtp-eng.com; equest-users at lists.onebuilding.org
>Cc: 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 cj at enersave.ca
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