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Calibration (METHODOLOGIES (Graphical techniques:
Time-series and…
Calibration
METHODOLOGIES
Graphical techniques:
- Time-series and scatter plots
3D comparative plot
(for time-dependent variables)
1) Hourly measured data
2) Hourly simulated data
3) Difference M - S
Calibration signature:
1) Residual = S - M
2) Calibration sign. = -Residual / M(max) %
3) Calibration sign. vs Outdoor temp.
Characteristic signature
1) Characteristic sign. = Change in consumptions / M(max) %
2) Compare with Calibration sign.
--> Detect errors in input
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Manual calibration:
- No automation
- Based on experience
- Trial and errors approach
Automated procedures:
posterior distribution of unknown parameters for better output-measured data match
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CALIBRATED SIMULATION
Simulated and monitored performance
Common elemets of approaches:
- Identify variables affecting energy use
- Select a period
- Include weather dara
- Post-retrofit measurements
Whole‐building calibrated approach:
1) Data
2) Run model
3) Compare output with measurements
4) Refine model until acceptability
5) Baseline & Post-retrofit models
6) Estimate savings
VALIDATION
Graphical comparison
Weather‐Day‐Type 24‐Hour Profile Plot
1) Divide measured data in 8 day-type
2) For each type: average Measurements vs day time/temperature
3) For each type: average Measurements vs day time/temperature
4) For each graph: mean bin line
5) Difference between mean lines
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ISSUES:
- Standardization
- Calibration costs (time)
- Simplified model
- Quantity/Availability of data
- Uncertainty
- Automation
- User's experience
Level of calibration:
1) Incomplete and split information
2) On site verification
3) Detailed audit
4) Short-term monitoring
5) Long-term monitoring