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NC-v4 EAp2:Minimum energy performance

Minimum efficiencies for VRF with heat pump system

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Instra Ingenieros
Chemical engineer
Instra Ingenieros, S.L.
LEEDuser Basic Member
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Hi there, I have a question regarding VRF efficiencies. We have an office building that have VRF with heat pump systems that provide cooling and heating. ASHRAE 90.1-2010 has two tables that address VRF efficiencies: Table 6.8.1 I – Variable Refrigerant Air Conditioners and Table 6.8.1 J – Variable Refrigerant Air-to-Air and Applied Heat Pumps.

After analyzing both we realized that cooling efficiencies between these two tables varied. Is this because Table 6.8.1 I applies to only cooling VRF systems and Table 6.8.1 J applies to VRF systems that provide heating and cooling? Therefore, should we compare the VRF systems installed in our building with Table 6.8.1 J?

Thanks in advance!

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Thu, 10/26/2017 - 18:15

Yes the two tables are for air conditioners only and heat pumps. If you have VRF heat pumps then you should use 6.8.1J.

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