ASHRAE-90.1-2022- - Page 362
Extracted Content
(This is a normative appendix and is part of this standard.)
NORMATIVE APPENDIX J SETS OF PERFORMANCE CURVES
J1. GENERAL
J1.1 Description. This appendix provides sets of performance curves that shall be used to represent the part-load performance of chillers in the budget building design when using Section 12 and in the baseline building design when using Normative Appendix G. They are also permitted to be used for the proposed building design when specific chiller performance is not known.
Each set includes three curves: an energy-input-ratio modifier as a function of temperatures (EIR-f-T) and as a function of a chiller’s part-load ratio (EIR-f-PLR), and a capacity modifier as a function of temperatures (CAP-f-T). These curves are intended to describe the part-load performance of a chiller when its operating capacity and power (not including cycling degradation) are calculated by the simulation program as follows:
Operating Capacity = Rated Capacity × CAP-f-T Operating Power = Operating Capacity × EIR-f-T × EIR-f-PLR × Chiller Input Power at Rated Conditions/Chiller Capacity at Rated Conditions Table J-3 provides the reference values for the curves. Tables J-4 and J-6 are to be used when the simu- lation program uses I-P units to evaluate the performance curves, and Tables J-5 and J-7 are to be used when the simulation program uses SI units to evaluate the performance curves.
Table J-1 Sets of Chiller Performance Curves for Section 12
| Equipment Type | Size Category | Set Path A | Set Path B |
|---|---|---|---|
| Air-cooled chillers | <150 tons | A | K |
| Air-cooled chillers | ≥150 tons | B | L |
| Liquid-cooled, electrically operated positive displacement | <75 tons | C | M |
| Liquid-cooled, electrically operated positive displacement | ≥75 tons and <150 tons | D | N |
| Liquid-cooled, electrically operated positive displacement | ≥150 tons and <300 tons | E | O |
| Liquid-cooled, electrically operated positive displacement | ≥300 tons and <600 tons | F | P |
| Liquid-cooled, electrically operated positive displacement | ≥600 tons | G | Q |
| Liquid-cooled, electrically operated centrifugal | <150 tons | H | R |
| Liquid-cooled, electrically operated centrifugal | ≥150 tons and <300 tons | H | S |
| Liquid-cooled, electrically operated centrifugal | ≥300 tons and <400 tons | I | T |
| Liquid-cooled, electrically operated centrifugal | ≥400 tons and <600 tons | J | U |
| Liquid-cooled, electrically operated centrifugal | ≥600 tons | J | U |
Table J-2 Sets of Chiller Performance Curves for Normative Appendix G
| Equipment Type | Size Category | Set |
|---|---|---|
| Water-cooled, electrically operated, positive displacement (rotary screw and scroll) | <150 tons | V |
| Water-cooled, electrically operated, positive displacement (rotary screw and scroll) | ≥150 tons and <300 tons | X |
| Water-cooled, electrically operated, positive displacement (rotary screw and scroll) | ≥300 tons | Y |
| Water-cooled, electrically operated, centrifugal | <150 tons ≥150 tons and <300 tons | Z AA |
| Water-cooled, electrically operated, centrifugal | ≥300 tons | AB |
360 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)