1. Analysis of 2008 Title 24 Nonresidential Compliance Site Audits
Matt Tyler & Allen Lee
6/13/17

2. Background Codes & Standards Program Impact Evaluation PY 2010-12
2008 Title 24, Title 20, Fed Appliance Stds
91 nonresidential new construction sites
Reviewed building dept records
Conducted site visits: ASHRAE Level II audit
Interviewed facility staff
Performed energy simulations

3. kWh Savings Relative to 2008 T24
Background (cont.)
Electricity Savings (91 sites)
Measure
kWh Savings Relative to 2008 T24
Skylighting/Sidelighting
11,368
Interior Lighting
2,399,327
Envelope
- 35,945
Cool Roof
176,463
DDC to Zone
832
HVAC Efficiency
408,762
Total
2,960,807

4. Primary Research Question
What are the building characteristics of compliant versus non-compliant sampled buildings?
Measure specific information on the over- & under- compliance

5. Approach
Review evaluation data to quantify factors related to compliance and non-compliance
91 nonres new construction site audits & simulations
Detailed site-level and measure-level characteristics
Simulation results to quantify impact of each measure on site’s overall compliance
Identify measures that contributed to over/under compliance

6. Approach
Used a variety of statistical techniques such as cluster analysis, data visualization, and regression analysis
Identify measure specific information on the over/under compliance
Identify any building characteristics correlated with over/under compliance
Building type
Floor area
Climate zone
Building department jurisdiction
Utility

7. Results
___________ was the only significant characteristic driving whole-building, interior lighting, and HVAC system compliance with Title 24
Building type
Floor area
Climate zone
Building department jurisdiction
Utility

8. Results
Building type was the only significant characteristic driving whole-building, interior lighting, and HVAC system compliance with Title 24
Building type
Floor area
Climate zone
Building department jurisdiction
Utility

9. Results
Building type was the only characteristic driving over-compliance of whole-building.
Following buildings may be good candidates to increase overall compliance:
Auto care/maintenance
Gas stations
Research and laboratories
Restaurants

10. Results
Building type was the only characteristic driving over-compliance of interior lighting.
Following buildings may be good candidates to increase lighting compliance:
Auto care/maintenance
Gas stations
High-bay or industrial
Medical buildings
Multifamily/group living
Research and laboratories
Restaurants

11. Results
Building type was the only characteristic driving over-compliance of HVAC efficiency.
Following buildings may be good candidates to increase HVAC efficiency compliance:
Auto care/maintenance

12. Results
Interior lighting, HVAC efficiency, and whole-building compliance are highly correlated
Interior lighting and HVAC efficiency compliance are driving factors of whole-building electric compliance trends

13. Results
Interior lighting tended to over-comply when LED lighting was installed.
Envelope tended to over-comply when continuous insulation was installed.
Cool roof tended to over-comply when higher values were specified for aged solar reflectance (~ 0.55 – 0.65) and emittance (~ 0.75 – 0.88)
HVAC tended to over-comply due to high-efficiency heat pumps, high-efficiency packaged variable air volume systems, high-efficiency ductless mini-split systems, and fault detection and diagnostic credit.

14. Matt Tyler Allen Lee CALMAC ID: SCE0412.01 Project Manager
Allen Lee
Principal Investigator