Hello all,

we are going to use ASHRAE 90.1-2010 for our LEED v2009 project in Germany. One problem pops up recently. The cooling system we will use in the project is a split cooling system which uses a compressor to distribute the refrigerant through a piping network to multiple indoor units. You can find the chiller here if you are interested:


The problem is in ASHRAE 90.1-2007, the efficiency of VRF cooling system was not covered in the mandatory provisions for LEED minimum energy performance, but in ASHRAE 2010 the minimum efficiency for VRF air cooled air conditioner of our size is 11.6. The ESEER value of our chiller mentioned above is 3.99. I guess there must be something wrong but I can't figure out where. I did some research, and found out that in Germany the efficiency (ESEER) of this kind of chiller is always around 4 to 6. How can it be that their efficiencies are all much lower than the minimum efficiency required in ASHRAE. Or is this kind of cooling actually not exactly the same as what ASHRAE describes, which means there is no requirement on the efficiency of our cooling system?

Thanks a lot.