[Equest-users] Modelling losses in chillers

[Jones, Christopher]

For example, if you are using the default chiller water efficiency of 4.4 COP. You need to reduce that efficiency by 5% to account for piping loses. DES cooling eff.: 4.4 * 0.95 = 4.18 COP.

Christopher R Jones, P.Eng.
T+ 1 416-644-0252

[cid:image002.png at 01D42FC8.6F990150]

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of equest user via Equest-users
Sent: Thursday, August 09, 2018 5:56 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Modelling losses in chillers

Hola Modelers,

Its time that I need some help!!

My building includes chilled water district cooling system in which I have received a review comment which is as follows:

“If following Option 2 of the district thermal guidelines the Proposed model must reflect a virtual plant with the same average efficiencies of the entire upstream district energy system based on actual loading (average efficiencies can be determined using either the Monitoring or Modeling methods described in Appendix C). Alternatively, the default plant efficiency values outlined in Section 2.4.1.2.3 of the guidelines (4.4 COP for DES cooling plant and 70% for DES heating plant) may be may be used to reflect the district energy plants in the Proposed model. In addition, thermal distribution losses must be accounted for in the Proposed model based on the losses determined in the actual design or the default values outlined in Section 2.4.1.2.3 of the guidelines may be used (5% for chilled water district cooling, 10% for hot water district heating, 15% for closed steam loop, or 25% for open steam loop)”

Can anyone help me on how should I account 5 % losses mentioned in the comment (highlighted in red)??

Waiting for the reply.

Thanks
Vishal

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