Two questions...
1) Is there a way to model a pump and dump chiller in eQuest version 3.64? The chiller I am trying to model rejects the condenser water heat by pumping city water through the barrel and dumping back into the sewer afterwards. I'm pretty sure this chiller is from the Mesozoic era.
2) I was trying to be on the safe side and make a backup copy of a model. However, I accidentally saved over the wrong file and lost a lot of work. Is there a way to revert back in time in eQuest to bring back a previous model? Something tells me I might be up a creek on this one.
Thank you all in advance.
Question 1 - I would need to play with this a bit, but you CAN get condenser water from a Lake/Well. I am unsure if eQuest still has the infamous "strainer cycle", allowing condenser water to be chilled water. They sure had it in 2.1E.
Question 2 - If you saved a previous copy of your model, you most certainly can got back and run it. It will simply not have the changes that you made to the one you lost.
When you say "go back in time", do you mean you saved a 3.64 file as 3.65? I have done this myself. It is better to stay in 3.65 than it is trying to revert it back into 3.64. Sort of like the Universal Translator in Star Trek.
Good luck.
John R. Aulbach, PE
Two questions? ?1)????? Is there a way to model a pump and dump chiller in eQuest version 3.64?? The chiller I am trying to model rejects the condenser water heat by pumping city water through the barrel and dumping back into the sewer afterwards. ?I?m pretty sure this chiller is from the Mesozoic era.? ? ? ?2)????? I was trying to be on the safe side and make a backup copy of a model.? However, I accidentally saved over the wrong file and lost a lot of work.? Is there a way to revert back in time in eQuest to bring back a previous model? ?Something tells me I might be up a creek on this one. ? ?Thank you all in advance. ? ? ?Thanks, ?Tom MickleyMechanical Engineer CEMThe K CompanyCell 330-760-3994Office 330-773-5125 ?
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1. Look for "Lake/Well" type chiller. You may have to configure some "dummy" loads as eQUEST may be expecting there to be both a CHW and HW load for this type of chiller...after another recent discussion I'm not sure if you can run with CHW loads only.
a. Depending on your water temperatures in this location you might be able to simulate it by using "magic" condenser water pumps and "magic" cooling towers with 0.0 EIR. You'll still be limited by the ambient wetbulb on what water temperature you can achieve, even with minimized approach temperatures - the Lake/Well option will give you the most control over the water temperatures you need.
2. You'll need to have some archiving tool on your PC to achieve recovery of your input files, eQUEST does not include any backup capabilities.
a. One possibility is if you ran the old model and saved over the input files - but didn't run the new model - then there might be some output files left over that you can extract some information from to recreate inputs. Look for "filename.BDL" and open it in notepad or viewer of your choice if you have it in your directory from a failed simulation. Otherwise maybe you can glean something from the other output files to help you reconstruct.
David
David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
Grumman/Butkus Associates
Tom,
To avoid future disagreement in the future and help streamline your
workflow, I recommend you look into revision control. It's a trick from the
IT world, and it's absolutely wonderful. No more saving over files, or
having to rename them and create backups. You get a clear history of your
changes (and since the .inp file is a text file you get to directly see
what you have deleted and added from one commit to another), and you can
revert to any commit (saving checkpoints if you want) you've created.
Maybe you can start by reading this post
I created on UH.
I personally use SourceTree as a git client but GitHub for Windows is nice
as well (simpler, but more limited), and I have some free private Bitbucket
repositories for collaboration with my team (when doing QA/QC works for
example), and it works really nicely. It does require a little bit of
getting used to it though, but you should pick it up quickly. Don't
hesitate to drop me a line if you have specific issues.
Otherwise there is still the possibility of using something simple such as
dropbox or box, that keep a history of files for you, but you won't get
nearly the same flexibility and clarity.
Cheers,
Julien
PS: That's a clear opportunity! I guess you won't much trouble saving your
client some water (and likely some money too depending on your
utility/water costs in your region) by replacing this archaic once-through
cooling system (single-pass cooling). Makes me think of some district steam
buildings (NYC...) where there is no heat recovery at all and condensate is
cooled with lots of potable city water before discharge to the drain. Yummy.
--
Julien Marrec, EBCP, BPI MFBA
Energy&Sustainability Engineer
T: +33 6 95 14 42 13
LinkedIn (en) : www.linkedin.com/in/julienmarrec
LinkedIn (fr) : www.linkedin.com/in/julienmarrec/fr
2015-01-07 18:40 GMT+01:00 Tom Mickley: