Question-and-Answer Resource for the Building Energy Modeling Community
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 | 1 | initial version |
There is a wide range of DX equipment. My experience:
CRAC units with DX cooling coil for data centres - The manufacture Vertive provided all the necessary data including a performance table with various cooling conditions. The data are project-specific. Performance curves were generated by regression analysis using Excel.
VRFs - Techical data books with performance tables are normally found online for Daikin, Mitsubishi, Toshiba, Panasonic, etc. They are general, not project-specific. Performance curves can be easily generated by regression analysis. The necessary information of indoor fans is more accessible as it is in the product catalogues.
I seldom use the default curves in simulation software as they perform much worse than the actual product's curves.
| | 2 | No.2 Revision |
There is a wide range of DX equipment. My experience:
CRAC units with DX cooling coil for data centres - The manufacture Vertive provided all the necessary data including a performance table with various cooling conditions. The data are project-specific. Performance curves were generated by regression analysis using Excel.
VRFs - Techical data books with performance tables are normally found online for Daikin, Mitsubishi, Toshiba, Panasonic, etc. They are general, not project-specific. Performance tables for outdoor units are shown in all the technical data books. Performance curves can be easily generated by regression analysis. Performance tables for coils in indoor units are often not shown in the data books. When capacity modifier curves for indoor units are unknown, I use the same curves as those for the connected outdoor unit i.e. the change in capacity of the indoor unit is considered to be directly proportional to the change in capacity of the outdoor unit. This is the case with EnergyPlus. IESVE can't customise VRF performance curves. The necessary information of indoor fans is more accessible as it is in the product catalogues.
I seldom use the default curves in simulation software as they perform much worse than the actual product's curves.
