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<TITLE>Re: [Bldg-sim] Chiller part load raw data points into eQuest</TITLE>
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<P><FONT SIZE=2>Check out Trane's website for a spreadsheet you can download that will convert the curves.<BR>
<BR>
Kevin L. Wyman, P.E.<BR>
LEED AP<BR>
On-Site Power Product Management<BR>
UTC Power<BR>
195 Governor's Highway<BR>
South Windsor, CT 06074<BR>
(860) 727-7020 (V)<BR>
(860) 660-0723 (F)<BR>
(860) 882-9595 (M)<BR>
Kevin.wyman@utcpower.com<BR>
<BR>
----- Original Message -----<BR>
From: bldg-sim-bounces@lists.onebuilding.org <bldg-sim-bounces@lists.onebuilding.org><BR>
To: Aulbach, John <jaulbach@nexant.com>; steve.gates@doe2.com <steve.gates@doe2.com>; bldg-sim@lists.onebuilding.org <bldg-sim@lists.onebuilding.org><BR>
Sent: Thu Dec 20 14:11:11 2007<BR>
Subject: Re: [Bldg-sim] Chiller part load raw data points into eQuest<BR>
<BR>
John,<BR>
<BR>
Here’s a thought. Speaking from memory.<BR>
<BR>
I believe in CoolTools you can insert the data you have (IPLV data), say at 4-5 conditions and then it will search it against a library and suggest a closest match.<BR>
<BR>
When you select a match (assuming you get one) then you can have it spit out the EIR-fT, CAP-Ft and EIR-fPLR curves.<BR>
<BR>
Obsiously you need CoolTools to do this. I tried searching for it and wasn’t able to fine it (only 5 minutes).<BR>
<BR>
You could try calling PGE Energy Center and have them locate it for you. It is supposed to be a free ware.<BR>
<BR>
<BR>
<BR>
Thanks,<BR>
<BR>
Rishabh<BR>
<BR>
<BR>
<BR>
Rishabh Kasliwal, P.E<BR>
<BR>
Cogent Energy, Inc.<BR>
<BR>
2300 Clayton Road Ste 480<BR>
<BR>
Concord CA, 94520<BR>
<BR>
925 521 9600 x306<BR>
<BR>
925 521 9604 (Fax)<BR>
<BR>
rkasliwal@cogentenergy.com<BR>
<BR>
________________________________<BR>
<BR>
From: bldg-sim-bounces@lists.onebuilding.org [<A HREF="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</A>] On Behalf Of Aulbach, John<BR>
Sent: Wednesday, December 19, 2007 5:02 PM<BR>
To: steve.gates@doe2.com; bldg-sim@lists.onebuilding.org<BR>
Subject: Re: [Bldg-sim] Chiller part load raw data points into eQuest<BR>
<BR>
<BR>
<BR>
So I cannot "reverse engineer" a part load curve that uses condenser water relief in calculating the points, knowing what condenser temps are used at what part load point (100%, 75%, 50%, etc) ???<BR>
<BR>
<BR>
<BR>
________________________________<BR>
<BR>
From: Steven Gates [<A HREF="mailto:steve.gates@doe2.com">mailto:steve.gates@doe2.com</A>]<BR>
Sent: Wednesday, December 19, 2007 4:57 PM<BR>
To: Aulbach, John; bldg-sim@lists.onebuilding.org<BR>
Subject: RE: [Bldg-sim] Chiller part load raw data points into eQuest<BR>
<BR>
Unfortunately the IPLV is of little or no value when setting up chiller curves. To set up the EIR-fT and EIR-fPLR curves requires more data points than is available in the IPLV. IPLV basically describes a two-dimensional curve, whereas the actual chiller performance is 3-dimensional. The IPLV assumes that condenser temperature drops as chiller load drops, but this is not necessarily the case. Examples:<BR>
<BR>
1. A cooling tower has a fixed setpoint of 85°F. Or, the condenser water source is a lake or river. In this case condenser temperature does not drop as chiller load drops.<BR>
2. A large plant has 3 chillers utilizing a single cooling tower. The current load is 33% of design, so one chiller is running at full load. IPLV assumes an entering condenser temperature of 85°F (full load), whereas the cooling tower is actually lightly loaded and can achieve a smaller approach to wetbulb.<BR>
3. The building is on the West coast (low wetbulb) vs. Florida (high wetbulb). Tower performance and condenser temperature vs. load is entirely different in these two climates.<BR>
<BR>
So while IPLV may be an interesting figure for rough comparisons, it is insufficient for an hourly simulation program. This is true for all energy simulation programs, not just eQUEST. Ultimately this issue will need to be addressed by standards organizations such as ARI, and/or equipment manufacturers.<BR>
<BR>
Steve Gates<BR>
eQUEST development team<BR>
<BR>
________________________________<BR>
<BR>
From: bldg-sim-bounces@lists.onebuilding.org [<A HREF="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</A>] On Behalf Of Aulbach, John<BR>
Sent: Wednesday, December 19, 2007 4:04 PM<BR>
To: bldg-sim@lists.onebuilding.org<BR>
Subject: [Bldg-sim] Chiller part load raw data points into eQuest<BR>
<BR>
<BR>
<BR>
Hi Gang:<BR>
<BR>
<BR>
<BR>
I have a part load curve from a chiller manufacturer for input into eQuest. Unfortunately, it has condenser temperature relief (this is an evaporatively cooled chiller, so we are speaking of dry bulb outdoor temperatures.<BR>
<BR>
<BR>
<BR>
Normally, I ask for a part load curve with a constant condenser temperature, and let eQuest modify this curve based on changing outdoor air conditions.<BR>
<BR>
<BR>
<BR>
But now I have the IPLV data and it deals with condenser relief. I DO have at what part load a particular condenser temperature occurs (complimenting this IPLV data.<BR>
<BR>
<BR>
<BR>
Can anyone help me?<BR>
<BR>
<BR>
<BR>
John R. Aulbach, PE, CEM<BR>
<BR>
Project Manager<BR>
<BR>
Nexant, Inc.<BR>
<BR>
100 North Barranca, Suite 820<BR>
<BR>
West Covina, CA 91791 USA<BR>
<BR>
Phone: 626-430-9054<BR>
<BR>
Fax: 626-430-9060<BR>
<BR>
email: jaulbach@nexant.com<BR>
<BR>
<BR>
<BR>
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