Gulf Coast Green 2012 Tenna Florian & Hazem Rashed-Ali

892 views

Published on

Post-Occupancy Evaluations of High-Performance Homes

Published in: Technology, Business
  • Be the first to comment

Gulf Coast Green 2012 Tenna Florian & Hazem Rashed-Ali

  1. 1. POST-OCCUPANCY EVALUATIONS OFHIGH-PERFORMANCE HOMESTenna FlorianHazem Rashed-Ali
  2. 2. Hacienda Ja Ja: A High Performance Home Lake | Flato Architects
  3. 3. “THERE are NO ZERO-ENERGY HOUSES, only ZERO-ENERGY FAMILIES.”- Andy Shapiro, energy consultant
  4. 4. TEAMArchitect: Lake | Flato Architects (Tenna Florian, Bill Aylor, Josh Canez, Gus Starkey)Contractor: Truax Construction (Jeff Truax)Interior Design: M. Robbins Black (Robin Black)Landscape Design: Rialto Studio (Pete Hinton)Lighting Design: George Sexton Associates (George Sexton)Structural Engineer: Jack HarrisonSolar: Cinco SolarMechanical: Southwest MechanicalSTATSConstruction Period: January 2009 to May 2010 (move in)Conditioned Space: 2,330 square feetUnconditioned Space: 950 square feet
  5. 5. LEED Highlights: Platinum Project: 87 points needed and 89.5 achievedLocations and Linkages: 10 of 10 points available infill, previously developed, and good access to transitSustainable Sites: 14.5 of 22 points available site stewardship, native landscaping, reduced heat island effect, permeable lotWater Efficiency: 11 of 15 points available rainwater harvesting, irrigation demand reduction, and highly efficient fixturesEnergy & Atmosphere: 33 of 38 points available optimize energy performance, efficient hot H2O systems, appropriate refrigerantsMaterials and Resources: 7.5 of 16 point available environmentally preferable products, waste reduction planIndoor Environmental Quality: 11 of 21 points available moisture control, outdoor air ventilation, local exhaust, ventilated garage
  6. 6. Water Efficiency: 11 of 15 points available rainwater harvesting, irrigation demand reduction, and highly efficient fixtures
  7. 7. Energy & Atmosphere: 33 of 38 points available optimize energy performance, efficient hot water systems, appropriaterefrigerants
  8. 8. Hacienda Ja Ja: A High Performance Home Lake | Flato Architects
  9. 9. POST-OCCUPANCY EVALUATION OBJECTIVES: • Verify overall house energy use, • Compare actual energy use with predicted energy use, • Identify potential for performance improvement, • Assess success of design strategies,Hacienda Ja Ja
  10. 10. MONITORING PERIOD: System installed on Nov. 11, 2010 to present. Monitoring period reported: January 1, 2011 through December 31, 2011. Four small periods of communication loss due to power outage (less than 1 hr. each). One larger period of communication loss (June 13 through 17).BUILDING OCCUPANCY: Building not regularly occupied during monitoring period. Occupancy period approximately one third of the year.
  11. 11. 100% 90% 80% 70% 60%Percentage of Days 50% 40% 30% 20% 10% 0% Jul-11 Dec-11 Jun-11 Sep-11 Mar-11 Feb-11 Aug-11 Nov-11 Apr-11 Jan-11 May-11 Oct-11 Monitored/ Occupied Monitored/ Not Occupied Not Monitored Month Monitoring / Occupancy Period
  12. 12. MONITORING EQUIPMENT: eMonitor: One eMonitor 12r installed. Monitors PV power production & energy use at circuit level. System online interface HOBOs: Five HOBO U12-012 Data loggers installed. Monitors temperature, humidity, lighting levels.
  13. 13. LOCATION OF MONITORING EQUIPMENT eMonitor-12r Hobo-U12-012
  14. 14. Post-Occupancy EvaluationMonitoring equipment • eMonitor: • One eMonitor 12r installed. • Monitors PV power production & energy use at circuit level. • System online interface • HOBOs: • Five HOBO U12-012 Data loggers installed. • Monitors temperature, humidity, lighting levels.
  15. 15. THE FOLLOWING ISSUES WERE IDENTIFIED / CORRECTEDDIRECTLY OR PARTIALLY DUE TO MONITORING SYSTEM:Kitchen Instantaneous Water Heater UsageSolar Domestic Hot Water PumpHVAC Dehumidifier SettingsPV System Blown Circuit
  16. 16. Green Switch turned on User in houseUser left heater on while building was unoccupied resulting in approx. 7kWh/day usage.Issue identified from monitoring, resulting in user changing behavior.
  17. 17. 3% 7% 1% 17%20% 0% 51% Data taken from 24 hr. time frame Turning off the Kitchen Water Heater reduced the house’s total Energy Usage 20%. 9% 1% 4% 22% 0% 64% Data taken from 24 hr. time frame
  18. 18. User changed settingsUser left AC on dehumidifier setting while the building was unoccupied- resultingin a high AC energy usage.Issue identified through monitoring and resulted in user changing behavior.
  19. 19. Problem identified (system off-line). Problem fixed (system online)Pump stopped working, hot water provided by auxiliary electric heating.Issue identified through user observation (hot water insufficient), and confirmed usingmonitoring system.
  20. 20. Problem fixed Problem startedLow PV production issue Identified by user.PV installer initially blamed resource variability.Upon user insistence, inspection showed a blown circuit in resulting in 50%reduction of production.
  21. 21. 2,000 Preliminary Results – Overall Energy Use: 1,500Energy Use (kWh) 1,000 500 0 -500 Jan-11 May-11 Jun-11 Aug-11 Feb-11 Apr-11 Jul-11 Mar-11 Nov-11 Oct-11 Sep-11 Dec-11 Months Utility Energy Use Building Energy Use PV Poduction
  22. 22. OVERALL ENERGY USE - 2011: 14,000 12,000 11,288 10,000 9,372Energy Use (kWh) 8,000 6,000 4,000 1,916 2,000 0 2011 Energy Use Totals Utility Energy Use Building Energy Use PV Poduction
  23. 23. ENERGY USE INTENSITY (EUI) - 2011: 18.0 16.5 16.0Energy Use Intensity (kBtu/ft2/yr) 14.0 13.7 12.0 10.0 8.0 6.0 4.0 2.8 2.0 0.0 2011 Energy Use Intensity Utility Energy Use Building Energy Use PV Poduction
  24. 24. PRELIMINARY RESULTS: energy + costHISTORY
  25. 25. ENERGY END USES - 2011: 1,600 1,400 1,200 HVAC 1,000Energy Use (kWh) Dryer 800 Oven 600 Kitchen Water Heater DHW 400 Lights /Plug Loads 200 0 Feb-11 Apr-11 Jul-11 Oct-11 Jun-11 Sep-11 Nov-11 May-11 Jan-11 Dec-11 Mar-11 Aug-11 Months
  26. 26. ENERGY END USES EUI - 2011: 2.50 2.00End Energy Use Intensity (kBtu/ft2/yr) HVAC 1.50 Dryer Oven Kitchen Water 1.00 Heater DHW Lights /Plug Loads 0.50 0.00 Jul-11 Sep-11 Aug-11 Mar-11 Jun-11 Dec-11 Jan-11 Feb-11 Apr-11 May-11 Oct-11 Nov-11 Months
  27. 27. ENERGY END USES - 2011: 1,274, 11% 399, 4% Lights /Plug Loads 1,057, 10% DHW Kitchen Water 153, 1% Heater 21, 0% Oven Dryer HVAC 8,113, 74% Total Energy End Uses (kWh)
  28. 28. ENERGY END USES INTENSITY - 2011: 1.87, 11% 0.58, 4% Lights /Plug Loads 1.55, 10% DHW Kitchen Water Heater 0.22, 1% Oven 0.03, 0% Dryer HVAC 11.88, 74% End Energy Use Intensity (kBtu/ft2)
  29. 29. COOLING SEASON DEMAND: 6.0 110 5.0 100 4.0 90 Building 3.0 80 Demand Power Demand (kW) Temperature (F) Utility Energy 2.0 70 Use 1.0 60 PV Production 0.0 50 AC USE -1.0 40 Ambient Temperature -2.0 30 -3.0 20 13:00 14:00 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 Hour of Day Hottest Day - August 28 (Building Unoccupied)
  30. 30. COOLING SEASON DEMAND: 6.0 110 5.0 100 4.0 90 Building Demand Power Demand (kW) 3.0 80 Utility Temperature (F) 2.0 70 Energy Use 1.0 60 PV Production 0.0 50 AC USE -1.0 40 Ambient Temperatur -2.0 30 e -3.0 20 16:00 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 Hour of Day Hottest Occupied Day (August 2)
  31. 31. HEATING SEASON DEMAND: 6.0 60 5.0 50 4.0 40 Building Demand 3.0 30 Power Demand (kW) Utility Temperature (F) 2.0 20 Energy Use 1.0 10 PV Production 0.0 0 AC USE -1.0 -10 Ambient Temperatur -2.0 -20 e -3.0 -30 16:00 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 Hour of Day Coldest Day – February 2nd (Building Unoccupied)
  32. 32. HEATING SEASON DEMAND: 6.0 90 5.0 80 4.0 70 3.0 60 Building Demand Power Demand (kW) 2.0 50 Utility Temperature (F) 1.0 40 Energy Use 0.0 30 PV Productio -1.0 20 n AC USE -2.0 10 -3.0 0 Ambient Temperat -4.0 -10 ure -5.0 -20 6:00 0:00 1:00 2:00 3:00 4:00 5:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 Hour of Day Coldest Occupied Day – November 27th
  33. 33. COMPARISON WITH RECS & REM RATEMODEL: Energy Use Intensity (kBTU/ft /yr) 40 2 37.6 1) Average EUI based on 35 RECS 2005 data. 30.1 30 Energy Usae Intensity (kBTU/ft2/yr) 2) REM Rate estimates 25 based on 19.8 design-stage 20 analysis 16.5 3) Actual EUI 15 based on consumption 10 8.04 from 1/1/2011 through 5 12/31/2011 2.8 0 Average TX Average TX REM Rate REM Rate Hacienda HaHa Hacienda HaHa Home Home (Mod.) Model (Building Model (Utility EUI (Building EUI (Utility Energy Use) Energy Use) Eneryg Use) Energy use)
  34. 34. PV PRODUCTION: ACTUAL vs. REM RATE10,000 20 1) Estimated 9,372 system size 9,000 18 (for REM Rate 7,795 model): 8,000 16 14.3 2) Actual System 7,000 14 Size: 7.5 PV Production (kBtu/sq ft) 11.9PV Production (kWh) 6,000 12 KW 5,000 10 4,000 8 3,000 6 2,000 4 1,000 2 0 0 REM Rate estimates Actual Production
  35. 35. DAYLIGHT LEVELS Average Day - January Average Day - April 100 100 90 90 80 80Daylight Levels (FC) Daylight Levels (FC) 70 70 60 60 50 50 40 40 30 30 20 20 10 10 0 0 1 3 5 7 9 11 13 15 17 19 21 23 1 2 3 4 5 6 7 8 9 101112131415161718192021222324 Hour of Day Hour of Day Average Day - March Average Day - May 100 100 90 90 80 80 Daylight Level (FC) Daylight Levels (FC) 70 70 60 60 50 50 40 40 30 30 20 20 10 10 0 0 1 3 5 7 9 11 13 15 17 19 21 23 1 3 5 7 9 11 13 15 17 19 21 23 Hours of Day Hours of Day
  36. 36. Daylight Levels (FC) 100 0 10 20 30 40 50 60 70 80 90 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 DAYLIGHT LEVELS 12:00Hours of Day 13:00 14:00 15:00 16:00 17:00 18:00 Fully Cloudy Day - Occupied - December 21 19:00 20:00 21:00 22:00 23:00
  37. 37. CONCLUSIONS• ROLE OF MONITORING IN IDENTIFYING: • maintenance issues • potential for performance improvement.• OVERALL EVALUATION OF HOUSE ENERGY PERFORMANCE.• IMPACT OF IRREGULAR OCCUPANCY• ACTUAL VS. MODELED ENERGY USE
  38. 38. THANK YOU,Questions?

×