Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Appendix 5.7 is a supporting document to the California Title 24 Part 6 Nonresidential Alternative Calculation Method (ACM) manual. It outlines the capabilities and rules for CBECC-Com (California energy code compliance software).
When looking at this document, be careful to identify E+ vs DOE-2 curves. E+ curves were created based on SI units, and DOE-2 curves are based on IP units. Some curve types are unit-independent (i.e. fan and pump curves) and others are not (i.e. chiller curves). You cannot use SI unit chiller curve coefficients in a software if you are using IP, and you will see some odd results. For fans and pumps there isn't an issue as the curve coefficients are interchangeable between units.
Another source for a VSD fan curve is ASHRAE 90.1 Appendix G:
| | 2 | No.2 Revision |
Appendix 5.7 is a supporting document to the California Title 24 Part 6 Nonresidential Alternative Calculation Method (ACM) manual. It outlines the capabilities and rules for CBECC-Com (California energy code compliance software).software). It is absolutely a valid source for curve coefficients.
When looking at this document, be careful to identify E+ vs DOE-2 curves. E+ curves were created based on SI units, and DOE-2 curves are based on IP units. Some curve types are unit-independent (i.e. fan and pump curves) and others are not (i.e. chiller curves). You cannot use SI unit chiller curve coefficients in a software if you are using IP, and you will see some odd results. For fans and pumps there isn't an issue as the curve coefficients are interchangeable between units.
Another source for a VSD fan curve is ASHRAE 90.1 Appendix G:
| | 3 | No.3 Revision |
Appendix 5.7 is a supporting document to the California Title 24 Part 6 Nonresidential Alternative Calculation Method (ACM) manual. It outlines the capabilities and rules for CBECC-Com (California energy code compliance software). It is absolutely a valid source for curve coefficients.coefficients, though I do not know what the source of the coefficients are.
When looking at this document, be careful to identify E+ vs DOE-2 curves. E+ curves were created based on SI units, and DOE-2 curves are based on IP units. Some curve types are unit-independent (i.e. fan and pump curves) and others are not (i.e. chiller curves). You cannot use SI unit chiller curve coefficients in a software if you are using IP, and you will see some odd results. For fans and pumps there isn't an issue as the curve coefficients are interchangeable between units.
Another source for a VSD fan curve is ASHRAE 90.1 Appendix G:
