[Equest-users] Table G 3.1.3.7

[Byron Burns]

The IP edition states "2 Water Cooled Centrifugal chillers minimum with
chillers added so that no chiller is larger than 800 tons, all sized
equally"


Byron D. Burns, EIT, BEMP 
Energy Analyst/ Modeler 

H&A Architects & Engineers | www.ha-inc.com <http://www.ha-inc.com>  
d: (804) 420-1622 p: (804) 285-4171 f: (804) 217-8520 



From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Hall,
Brendan
Sent: Thursday, October 17, 2013 9:20 AM
To: rakeshdesai at ecpl.co.in; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Table G 3.1.3.7

 

I've always thought that this was an error in table G3.1.3.7 in the SI
version but I don't know if it was fixed. In the IP version of 90.1 if
your building cooling load is over 600 Tons, you should use " 2 water
cooled chillers minimum with chillers added so that no chiller is larger
than 800 Tons, all sized equally". Notice that the SI table column
header says "Building Peak Cooling Load" but then lists areas. Maybe
there is a reason for it that I don't know but it seems incorrect to me.


 

 

 

Brendan Hall,  PE, LEED AP BD+C

Engineer, Mechanical

karpinski
ENGINEERING
3135 Euclid Avenue
Cleveland, OH  44115
P  216.391.3700 Ext 3111
E  bhall at karpinskieng.com
W www.karpinskieng.com <http://www.karpinskieng.com/> 

 

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Rakesh
Desai
Sent: Thursday, October 17, 2013 8:58 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Table G 3.1.3.7

 

Dear All,

 

1.          I had submitted energy model for certification and have
received following reply:

 

As per table G3.1.3.7, ASHRAE 90.1.2007, "as chiller auto size capacity
is more than 600 tons, centrifugal chiller should be considered". 

 

My building conditioned area is < 22296 m2 and as per model my chiller
capacity is more than 600 TR and I have to use 2 chillers. I have
modeled 2 nos. screw chillers of equal capacity (auto size mode) with
5.5 COP.

 

I checked the table and no where it is written that we need to model
centrifugal chillers.

 

Can someone help me to understand where I went wrong?

 

2.          I had submitted PS E report of all rotations of base case
and have received following reply: 

Peak demand (946.52kW) reported for cooling is not matching with chiller
input (For 2*613 TR and 5.5 COP, 783kW). So cooling savings in not
justified. 

 

As per first submittal comment, I had changed my chiller to auto size
mode and the chiller capacity is selected by model and not by me. Now, I
have received above comment. What is the way out?

 

 

Thanks,

 

Rakesh Desai

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