This is the final report for the control loop performance assessment project sponsored by ASHRAE. In this project, two single control quality factors (CQFs) in the context of building heating, ventilation and air-conditioning (HVAC) controls were developed and tested. These CQFs need to be objective, quantitative metric with simple-to-interpret criteria; additionally, they need to use only typically available data from HVAC control systems, such as the control loop output.
An extensive review of control loop performance assessment in various industries reveals that few studies are available to assess HVAC control loop performance. We systematically reviewed 35 indices and their associated methods of evaluating control loop performance, including their drawbacks and merits. Fourteen of these indices were selected to assess their performance on an air handler unit (AHU) heating coil outlet air temperature control loop using simulated data from a dynamic Modelica model. Based on the review and preliminary simulation results, two CQFs — the normalized Harris Index and Exponential Weighted Moving Averages (EWMA) — were recommended for further investigation. The first CQF (i.e., CQF-Harris) is based on the normalized Harris Index, together with a reversal index that detects control response trend reversal behaviors. The second CQF (i.e., CQF-EWMA) is the EWMA-based index along with the reversal index.
Product Details
- Published:
- 2016
- Number of Pages:
- 235
- Units of Measure:
- Dual
- File Size:
- 1 file , 4.7 MB
- Product Code(s):
- D-RP-1587
