1.1.2 DX Cooling EER and COP for PRM Baseline systems

The pre-defined DX Cooling types provided in ApacheHVAC are set up to meet 90.1-2007 PRM requirements for Baseline systems. There are 11 pre-defined systems available:

·       5 for Packaged Single-Zone systems (PSZ) for different size ranges and associated COPs

·       3 for Packaged Terminal Ari-Conditioning (PTAC) for different size ranges and associated COPs

·       3 for Packaged Terminal Heat Pumps (PTHP) for different size ranges and associated COPs

The COP values in the pre-defined DX Cooling types match ASHRAE 90.1-2007 requirements (according to the tables at the end of Chapter 6), as adjusted per CA Title-24 ACM Manual methods to remove the supply fan power from the EER that was determined for a packaged unit at ARI conditions. This is the same as what is done for older 90.1 EER numbers (with fan) provided as pre-defined options in the eQuest Wizard and subsequent conversion of these to EIR without fan in the detailed interface. The difference in ApacheHVAC is that, rather than presenting an EER with SA fan and converting it to an EIR without SA fan, the DX Cooling Type dialog provides the EER with SA fan from 90.1 chapter 6 tables only in the reference name of the DX Cooling Type. The actual number used in the input field for that dialog is the COP without the fan—i.e., after applying the Title-24 ACM method for removing the supply fan power.