Hi All,

My first post here... I really hope it works!

I'm LEED AP for the project working with a 3rd party engineer who has advised:
"Why the CRACs don't comply is because the requirement is too stringent for a fundamental prerequisite for a data centre" !?

So, if the Data Centre is part of the LEED project scope... and we can NOT find CRAC Units that do comply... is this project doomed to fail?

I have add the details of the specified CRAC Units below for reference.

Capacity at the specified design operating conditions (not ARI340/360) : 67.7 kW Nett (=230,992btu/h)
Electrical Input : 24.88kW
EER = 230.992/24.88 = 9.28
Required for this btu/h is 11.0

Nominal capacity (as per catalog) 67.0 kW at inlet air conditions of 24degC/50% rh - also no use
ARI340/360 standard rating conditions are 26.7degC/50%. Basing on those conditions we may be able to get improved performance data (will take some time to get data from CRAC vendor), but I think it is very unlikely that we will achieve ASHRAE90.1 values.

Note that these CRAC units:
a. are air conditioners
b. are air-cooled type
c. have no heating
d. are split systems
e. can be described as an electrically operated unitary air conditioner
f. are not heat pumps (hence I don't look at page 45 of ASHRAE90.1)

Hence I look at ASHRAE90.1 page 43

Thanks in advance... Looking forward to you advice.