Improving the Energy Performance of the Gemini House. E.S. Tzekova K.D. Pressnail M.F. Touchie R.C. Richman M.E. Rumeo A.M.

Transcription

1 Improving the Energy Performance of the Gemini House E.S. Tzekova K.D. Pressnail M.F. Touchie R.C. Richman M.E. Rumeo A.M. DiPlacido

2 Overview Historic Building Context The Gemini NTED Project Overview Thermal Control Layer Moisture Control Layer Air Control Layer Energy Performance Benefits & Challenges

3 Canadian Building Impacts 33% of energy consumption 35% of greenhouse gas emissions 50% of natural resource consumption 35% of waste going to landfill Source: Canadian Green Building Council. Why Green Building? [Online]. Accessed October Available: 3

4 Energy Impacts of Old Buildings 1.20 Energy Use Intensity (GJ/m 2 ) Commercial & Institutional Residential Buildings Before Sources: Natural Resources Canada. Comprehensive Energy Use Database Tables [Online]. Accessed October Available: trends_com_ca.cfm; US Department of Energy. Building Energy Data Book [Online]. Accessed October Available: 4

5 Gemini Project Sponsors Natural Sciences and Engineering Research Council Neil B. Hutcheon Bequest University of Toronto 5

6 Project Objectives To provide an alternative way of retrofitting historic buildings using Nested Thermal Envelope Design (NTED ) approach. To significantly reduce space heating energy use compared to OBC Supplementary Standard-12. To preserve the historic façade and character defining elements. 6

7 The NTED Concept Two thermal envelopes surrounding Core and Perimeter areas Both envelopes control movement of heat, moisture and air Perimeter used as efficient solar recovery zone 7

8 Heating & Fresh Air Systems Space Heating Radiant floor heating system Heat pump (alternative) Fresh Air Energy recovery ventilators condition incoming air One for the Core, one for the Perimeter 8

9 Thermal Control Layer Core & Perimeter envelopes Addressing thermal bridging during design and construction Continuity Exterior and field inspections Exterior Original Roofing and Framing Existing Existing Brick Brick Interior - Perimeter Zone Example of a Perimeter Wall Interior - Core Zone Interior - Core Zone Example of a Core Ceiling Wall Plywood Polymer Mesh Spray Foam - Polymeter 100mm Mesh Spray Foam Spray - 190mm Foam - 100mm Wood Framing Perimeter Airspace Gypsum - 150mm Perimeter Airspace - 150mm Drywall Hangers Mineral Spray Wool Foam Insulation - 100mm- 184mm Framing Polyethylene Gypsum with Taped Edges 9

10 Thermal Control Continued 10

11 Thermal Control Continued 11

12 Moisture Control Layer Venting and drainage layers (10-15mm thick) Re-use original windows as storm windows 12

13 Moisture Control Continued 13

14 Air Control Layer Envelope continuity Closed-cell spray foam insulation Mineral wool/polyethylene Window-to-wall interfaces Quality Control During Construction Fan depressurization testing Duct blaster testing 14

15 Air Control Continued 15

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19 Energy Savings R2000+ envelope (Core and Perimeter) Potential for solar gain and storage Interior spaces heated as desired Solar gains delivered to Core as required 19

20 Performance Predictions Modeled Energy Performance Parameter Baseline (ekwh /m 2 ) Gemini C&P (ekwh/m 2 ) Annual Space Hea,ng Energy Total Energy Consump,on Normalization for Comparison with Actual Consumption Space Heating Consumption (kwh) y = x R² = Heating Degree Days 20

21 Energy Performance Modeled vs. Actual Space Heating Consumption Space Heating Energy Consumption (ekwh) % 31% 42% 46% 42% 50% 45% 65% January February March April SB-12 Compliant Model Gemini - C&P Model Actual Consumption 21

22 Benefits and Challenges Significant space heating reductions Improved occupant comfort Extended service life of building Application to other types of buildings Thermal and air control layer continuity Quality control during construction Contractor education 22

23 Thank you! For more information contact: Or visit our blog at: science/gemini.htm 23