[Bldg-sim] Modelling in Design Builder_VRF System

Javed Iqbal javedvit at gmail.com
Tue Feb 27 06:50:37 PST 2018


See my answers below..

On Tue, Feb 27, 2018 at 11:42 AM, Sprout Info_Mail via Bldg-sim <
bldg-sim at lists.onebuilding.org> wrote:

> Dear Design Builder Users,
>
> I have a few queries regarding modelling in Design Builder-
>
> 1. Is there by any chance an alternative to the VRF system type in a older
> version of Design Builder. I do not have the newer version of Design
> Builder and have been using an older version ie 3.2. The project that i
> need to model is for climate zone 3 as per ASHRAE 90.1.2010 and have
> selected the System type 4 ie PSZ-HP for the base case. However i want to
> model the design case with the actual VRF system or an alternative. Is
> there a way i can use an existing system and change only its COP value as
> per my design case?
> ​ The simple answer is NO because both VRV/VRF and conventional has
> different​ performance characteristics though some workaround has been
> discussed on this forum in past as used by advance users . The compressor
> unit uses variable refrigerant flow and is controlled by a variable-speed
> drive, which may operate more efficiently than conventional compressors of
> similar size. Refer this [LINK
> <https://smartech.gatech.edu/bitstream/handle/1853/50227/PARK-THESIS-2013.pdf>]
> to understand potential energy savings benefits of VRV compared to other
> conventional systems.
>
> 2. How do i model the additional lighting load that is calculated for my
> design as per ASHRAE 90.1  separately or does it have to be input in the
> regular lighting tab.
> ​ If the lighting loads are in unconditioned space , you could assign
> additional lighting load to some non-regularly occupied spaces perhaps
> restroom, storage etc.
>
> 3. The project has not specified the building envelope material
> specifications like walls, roof etc since this is a Retail Interior V4
> project. So construction of the project is not new and is 100% existing.
> However for envelope modelling purpose i have selected the standard base
> case values for new construction for both the base and design case. Is this
> right?
> ​ Refer [Link
> <https://www.usgbc.org/node/2613368?return=/credits/commercial-interiors/v4>]
> which says - *the baseline project envelope must be modeled according to
> Table G3.1(5) (baseline), Sections a–e, and not Section f. You need to
> check in LEED ID+C v4 reference guide for better clarity*
>
​​


> ​Hope this helps to some extent!!
>
> Inputs appreciated on the above points.
>
> TIA.
>
> Namrata
>
>
> --
> Thanks and Regards ,
>
> Pranati Shroff & Namrata Dhamankar
>
> *a:* Sprout ,Prabaht Printing Works ,
> 427 Gultekdi, Ind Estate Corner,
> 2nd Floor, Pune-411037
> *m:* 9922215467
> *e:  *info at sprout-green.com
> projects at sprout-green.com
> *w: *www.sprout-green.com <http://www.sprout-green.com>
>
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.
> www.avast.com
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
> <#m_-4967783757498710886_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
> _______________________________________________
> Bldg-sim mailing list
> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
> BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
>
>


-- 

Javed Iqbal, LEED AP, CEA
Sr. Energy Analyst
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180227/c9faa12e/attachment.html>


More information about the Bldg-sim mailing list