Data Centers

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Does anyone have experience with either modeling or LEED certifying a
data center (or both)? I am specifically wondering how one should go
about documenting an energy savings associated with a multiple megawatt
equipment load, and which option for EA Credit 1 previous data centers
have accomplished.

Thank you in advance.

Matthew Higgins, LEED AP

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Matt, see the attached, also, on our most recent LEED data center, we
have just assumed the data center as just one huge plug load. ( our
data had a medium sized office component ).

Attached is a new interpretation to ANSI/ASHRAE/IESNA Standard 90.1-2004
(IC 90.1-2004 -17) approved by SSPC 90.1 on April 12, 2008. Included are
PDF versions for posting on the ASHRAE website at
http://www.ashrae.org/publications/detail/15211.

Steve Ferguson, Assistant Manager of Standards - Codes
American Society of Heating, Refrigerating and Air-Conditioning
Engineers, Inc.
Direct Line: 678-539-1138 Fax: 678-539-2138 eMail:
SFerguson at ashrae.org Web: www.ASHRAE.org

Leonard Sciarra, AIA, LEED(r) ap

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Hello everybody,

I am trying to simulate a water source heat pump with a variable speed compressor in eQUEST. I have selected PVVT as the system and have come across some interesting results.

When the Single Speed compressor is selected under Cooling\Unitary Power\Cooling Compressor, the PS-C report shows the boiler and cooling tower both operating for various hours throughout the year, as expected. However, when the compressor is changed to Variable Speed, the boiler operation hours disappear, but the cooling tower hours remain.

Is this because it simulates the heating DX coils as air cooled but the cooling DX coils as water cooled? If so, this is not a representation of a water source heat pump.

Any insight will be greatly appreciated.

Regards,

Dana Troy

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Dana:

As I know, there is no water-to-air heat pump (packaged unit not the multi-split VRF) with variable speed compressor available on market yet though it is on the way. However, there is heat pump with staged capacity, which is typically implemented by 2-stage scroll compressor. I'm not sure how the selection of variable speed compressor affect the boiler operation, but it seems the variable speed compressor is not a valid option for water-to-air heat pump.

Xiaobing

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