[Equest-users] How to Oversize Boilers & Chillers as per ASHRAE 90.1

[Omar Katanani]

UPDATE:

 

As a follow-up to my query sent earlier:

 

I realized that if you have 2 chillers and you leave the capacity ratio
empty, you will get the same consumption as when you put it 0.5

 

Accordingly, the oversizing will need to be applied on the default
capacity ratio, which is 0.5.

 

Hence, for the baseline case, input 0.575 as a Capacity Ratio for the
chillers and 0.625 as a Capacity Ratio for the boilers.

 

Best regards,

Omar

___________________________

Omar Katanani
Sustainable Design Engineer

Email: omar at ecoconsulting.net

 

EcoConsulting (Lebanon)

Nahas Building, 4th floor

4 St-Maron Street / Georges Haddad Avenue

Postal Code: 2028 5806 SAIFI

Beirut, Lebanon

Tel:          +961 (0) 1 971 266
Mobile:    +961 (0) 3 045 045

 

EcoConsulting (UK) Ltd
28 Marshalsea Road
London, SE1 1HF
Tel:  +44 (0) 207 939 0989
Fax:  +44 (0) 207 939 0981

Website: www.ecoconsulting.net <http://www.ecoconsulting.net/> 

 

  

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Omar
Katanani
Sent: 28 January 2011 17:17
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] How to Oversize Boilers & Chillers as per ASHRAE
90.1

 

Dear all,

 

ASHRAE 90.1 requires that you oversize chillers by 15% and boilers by
25%.

Having 2 chillers, I initially entered 1.15 for the capacity ratio for
each of the chillers.

 

I read a recent email on the forum saying that the capacity ratio must
be 0.575 for each (for a total of 1.15).

 

The issue is that the %improvement in the energy costs was 22.2% for the
1.15 Capacity Ratio and 16.5% for the 0.575 Capacity Ratio. The
difference between both scenarios translates to 3 LEED Credits, which is
super important!

 

I'd honestly like to use the 1.15 figure! Has anyone got a comment
review that he/she must use 0.575?

 

Many thanks,

Omar

___________________________

Omar Katanani
Sustainable Design Engineer

Email: omar at ecoconsulting.net

 

EcoConsulting (Lebanon)

Nahas Building, 4th floor

4 St-Maron Street / Georges Haddad Avenue

Postal Code: 2028 5806 SAIFI

Beirut, Lebanon

Tel:          +961 (0) 1 971 266
Mobile:    +961 (0) 3 045 045

 

EcoConsulting (UK) Ltd
28 Marshalsea Road
London, SE1 1HF
Tel:  +44 (0) 207 939 0989
Fax:  +44 (0) 207 939 0981

Website: www.ecoconsulting.net <http://www.ecoconsulting.net/> 

 

 

 

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