[Equest-users] VRF system in eQUEST

RobertWichert robert at wichert.org
Thu Jun 28 07:26:20 PDT 2012


Have you considered bundling the zones into one DX zone combining the 
loads and then using the AHRI SEER and EER for the entire bundle?  That 
seems pretty simple to me.


Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068







===============================================

On 6/28/2012 7:13 AM, Matt Clough wrote:
>
> I am in a similar situation and wanted to contribute to the discussion.
>
> Of the two approaches proposed by the BSUG (wshp vs. air cooled), 
> which is the most accurate?  Which is more conservative?  Does one 
> seem to be preferred over the other?
>
> I like the WSHP approach because the way the systems are separated 
> seems most like the way a vrv is actually assembled.  The condenser 
> water loop represents the exchange between the rooftop condenser and 
> the refrigerant branch selector.  The pvvt systems represent the fan 
> coils for each zone.  At least, I think I'm understanding this 
> correctly.  I like that I am able to put group the fan coil units as 
> if they are connected to the same condenser, but I don't really know 
> that much and wonder if this really matters as far as a simulation is 
> concerned.
>
> From the literature, it seems that the advantage of using the air 
> cooled condenser is the access to the variable speed compressor 
> (although I have been able to select that option in the DDE).  What 
> are some of the other advantages of using the air-cooled condenser?
>
> Regards,
>
> Matt Clough
>
> *From:*Alea German [mailto:agerman at davisenergy.com]
> *Sent:* Wednesday, June 27, 2012 3:19 PM
> *To:* Eleni Soulti; equest-users at lists.onebuilding.org; 
> bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Equest-users] VRF system in eQUEST
>
> Hi Eleni,
>
> There are a resource that has been put together by modelers at the 
> Energy Trust of Oregon on a work-around for VRF systems in eQUEST, see 
> attached. Yes, the method is to use PVVT system types. If heat 
> recovery is available there is a post-processing step with the hourly 
> data to identify when simultaneous loads occur.
>
> Alea
>
> /____________/
>
> */Alea German/*
>
> Davis Energy Group
>
> agerman at davisenergy.com <mailto:agerman at davisenergy.com>
>
> ph: 530-753-1100 x30
>
> 123 C Street
>
> Davis, CA 95616
>
> *P****Please consider the environment before printing this email*
>
> *From:*Eleni Soulti [mailto:elenisoulti at co2engineering.eu]
> *Sent:* Tuesday, June 26, 2012 11:25 PM
> *To:* equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
> *Subject:* [Equest-users] VRF system in eQUEST
>
> Dear all,
>
> I am new to eQUEST and trying to model a VRF system. There is no such 
> option, so I think some people model it as PVVT. Any suggestions or 
> resources on that? Thank you very much.
>
> Regards,
>
> Eleni Soulti
>
> On behalf of
>
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