1 Zen House A Case Study on Design, Construction and Cost/benefit Analysis of a High Performance Home Presentation for Net Zero Networking & Exchange CHBA Net Zero Energy Housing Council May 13, 2015 Ottawa by: Arthur LO Insightful Healthy Homes Inc.
2 Design A tailored-designed and custom-built 2 ½ storeys single family home -finished floor area 3942 sq. ft. plus 740 sq. ft. heated crawl space House owners requirements: highest energy performance possible with a healthy and comfortable living environment, and is albeit built on the cost within their budget limit. economically viable but practical interior finishings, home appliances, and lighting and plumbing fixtures. Large room in their dream home which would be used for occasional meditation gatherings the exterior look of the house should reflect their religious beliefs.
3 Curb Appeal The house is designed for ZEN style: The aesthetic appeal of the house demonstrates the ideals and insights of ZEN -balance, stability, tranquility, and nature. symmetrical front of the house represents balance. lower-and upper-storeysare proportioned to achieve stability Clear and simple exterior finishes show tranquility Natural stone steps on front stairs and two round columns in solid wood at the porch highlight the natural theme. Feature rocks on white gravel on both sides of front stair emphasize the ZEN style.
4 Design for Energy Efficiency Day-lighting South facing clerestory windows near top of family room in upper floor bring in day lighting to the central part of upper floor Sun light through the clerestory windows shines on the white walls and reflects through the lower windows on the upper floor into the Great Room, bringing daylight to main floor
5 Natural ventilation In shoulder seasons, outdoor air temperature provide the occupants with thermal comfort solely by natural ventilation through the house. The south-facing windows in the Great Room on main floor, the windows in the Family Room on upper floor, and the motorized window at top of the stairs will facilitate free air flow to enhance natural ventilation. This natural ventilation is activated by opening the motorized window at top of the stair (the highest operable window in the house) by use of a remote
6 Building Envelope and Systems Foundation: 3 TYPE 2 EPS RIGID INSULATION BOARD SA WATERPROOFING MEMBRANE (AB) 6 CONCRETE IN INSULATED CONCRETE FORM, ICF ½ DRYWALL LOW-PERMEANCE LOW-VOC WATER-BASED PAINT, <30 ng/(pa.s.m^2) (VB) EFFECTIVE R-VALUE = 30.5
7 Base Slab FLOOR FINISHING 4 THICK CONCRETE SLAB SEALED 6 mil POLY (AB & VB) 3 TYPE 2 EPS RIGID INSULATION BOARD MIN. 4 GRAVEL COMPACTED SOIL BASE EFFECTIVE R-VALUE = 12.0
8 Wall assembly: ¾ lstucco ¾ AIR SPACE 1X3 TREATED STRAPPING 2 R8 ROXUL COMFORT BOARD AIR-TIGHT TYVEK HOUSE WRAP (AB) ½ PLYWOOD WALL SHEATHING 2X6 O.C. WITH DOUBLE TOP PLATE AND 2 STUDS CORNER 5.5 R22 BATT INSULATION ½ 5DRYWALL LOW-PERMEANCE LOW-VOC WATER- BASED PAINT, <30 ng/(pa.s.m^2) (VB) EFFECTIVE R-VALUE = 25.7
10 Windows and Doors FIXED, AWNING, CASEMENT WINDOWS OR FRENCH DOORS VINYL FRAME TRIPLE GLAZING LOW-E COATING ARGON GAS INFILL INSULATED SPACER
11 Heating and cooling High efficient cold climate air source heat pump (Mitsubishi Zuba-Central, heating HSPF 9.4, cooling EER 12.0 SEER 15.00) Forced air system Two zones control (one for basement and the other for main and upper floors) to better control the room temperatures at different thermal conditions.
12 Air Filter A MERV 13 bag filter is installed in the HVAC duct system -see the metal box holding the bag filter at the return side of air handler. Air handler fan will run continuously to circulate air inside the house while passing air through the filter to achieve the best air quality.
13 Hot Water High efficient gas water boiler with indirect tank (IBC VFC , 95% AFUE)
14 Ventilation Eneready 2000 HRV Whisper Power grills with PoshTimezone switches at all bathrooms HRV supply integrated with the heating supply ducts. HRV exhaust in dedicated HRV exhaust ducts All HRV ducts were tested on site before drywall to ensure air-tightness.
15 Lighting 70% of lighting fixtures in LED light 20% of lighting fixtures in CFL Motion-sensor control for exterior lights Appliances and other electrical equipment All new home electric appliances, including fridge, dishwasher, range, hood fan, washer and dryer in are Energy Star rating.
16 Construction Foundation Fabric footing forms save time and materials in footing construction. prevent common moisture problems in basement due to wicked up moisture by capillary action from footing through concrete wall into basement living spaces. act as air barrier under footing connecting the 6 mil poly (air barrier) underneath base slab with the waterproofing membrane (air barrier) on the outside face of foundation wall.
17 Foundation Insulated concrete form (ICF) with 2.25 thick EPS on both sides of the 6 concrete core save both time and material in foundation wall construction. higher insulation and perform better moisture-proofing than normal basement wall construction As an energy conservation measure, a layer of 3 EPS insulation board was installed on the waterproofing membrane in full height on the outside face of foundation wall.
18 Unlike normal construction, the house wrap has to be sealed and taped at all joints between each sheet of house wrap
19 The house wrap has to be sealed and taped between the house wrap and other members of the building envelope, such as doors, windows, and all penetrations through the wall e.g. water pipe and wires.
20 The house wrap was installed on the wall sheathing using staples with plastic caps. This could minimize the number of staples used, thus minimizing the number of penetration through the air barrier, while holding the house wrap securely in place.
21 This photo shows different elements and stages of construction at the exterior wall: 1) sealed house wrap at top right corner, 2) exterior insulation board at top center and 3) rain screen strapping as lower level.
23 Windows installation Because of the additional 2 thick exterior insulation, the weatherproof and air seal work in window installation for the Zen House are different from normal construction. The differences are: Addition of metal flashing at window sill Bigger metal flashing at window head Extra wood trims around the windows
25 Step 2 apply a 4 wide flashing below the window sill (do not staple the bottom each of the flashing)
26 Step 3 install a treated wood block below window sill (to support the metal flashing of window sill)
27 Step 4 tape the corners, window sill, wooden block
28 Step 5 apply trim flashings around the rough opening Step 5 apply trim flashings around the rough opening
29 Step 6 install the window
30 Step 7 install the metal head flashing and apply tape along the top edge of the flashing
31 Step 8 install the metal window sill flashing below window and on the wooden block
32 Step 9 install house wrap around the window, tape and seal all joints
33 Step 10 install the 2 insulation board on the house wrap
34 Step 11 install rain screen strapping
35 Step 12 Install trims around the window Step 13 add another metal flashing on top of top window trim (diagram not shown)
38 Ceiling under roof House wrap MUST be fully supported on both faces during its servicing life in order to ensure its long term integrity as air barrier. At ceiling under roof, house wrap (a flexible membrane) is only supported by roofing trusses or joists (at 24 or 16 on center), -no full support at its top surface Therefore, house wrap is not suitable as air barrier at ceiling under roof. (It is used as air barrier on the vertical surfaces of the building envelope only). Rigid material, e.g. taped drywall, which has the strength to ensure long term integrity is more suitable as air barrier at ceiling under roof.
39 To ensure the continuity of air barrier, the house wrap at top of exterior wall was wrapped from outside passing between two top plates to the inside of the wall and was then well taped along its edge on the internal face of the lower top plate.
40 Gasket was stapled along the taped end of house wrap on the top plate of exterior walls under roof. Gasket was also installed along the top plate of all interior walls under roof. Drywall boards were installed on the ceilings and walls with close space drywall screws along the top edges of drywall. With the taping at all drywall corners, the drywall and gaskets act together as air barrier sealing off air leakage to/from the open space in roof.
41 Air Test Post drywall test To study air seal performance of the house wrap All drywall was installed and taped, all openings through the building envelope, such as venting ducts and hood fans, were closed. The air test would show the air seal performance of the house wrap at walls, taped drywall at ceiling under roof, poly under base slab, and all windows and doors. Test result: Pa and in^2 10 Pa.
42 Final test The final air test was conducted after the completion of the house. Under the new R2000 requirements, all openings cannot be closed during the air test. These openings in Zen House include two hood fans, the intake and exhaust ducts of HRV, two dryer vent ducts, one hot water boiler vent duct. Test result: Pa and in^2 10 Pa The result indicated the effect of the above openings on the overall air tightness of the house.
43 Energy Conservation Measures (ECM) 2 broader approaches Provide higher insulation and better air-tightness of the building to reduce heat loss, reducing the energy required to keep the building in a livable condition Increase the efficiency of mechanical systems, lighting and home appliances, so that they can use less energy to perform their functions.
44 These two broader approaches can be carried out through 9 energy conservation measures (ECM) 1. Increase insulation of the foundation wall 2. Increase insulation of base slab 3. Increase insulation to above grade exterior wall 4. Increase insulation of roof 5. Upgrade windows and doors 6. Improve air-tightness of the house 7. Upgrade the efficiency of heating and cooling system 8. Upgrade the efficiency of domestic hot water system 9. Use higher efficient lighting and home appliances
45 ECMs adopted in Zen House The energy performance of a particular ECM is found by analyzing the Baseline house with the additional of that ECM using energy simulation software HOT2000 The additional cost for ECMs is based on the actual expenditure record from the Zen House project
46 ECM #1 Location: Foundation wall Baseline construction: 8 concrete wall plus 2x4 R12 furring wall inside Upgrade: Use ICF wall and add 3 EPS insulation on outside face of wall Annual energy saving: kwh Additional cost: $4,494.31
47 ECM #2 Location: Foundation base slab Baseline construction: 2 wide 3 EPS insulation under slab along foundation walls Upgrade: 3 EPS insulation under whole base slab Annual energy saving: kwh Additional cost: $1, Note: many municipalities have required insulation under whole base slab if radiant floor heating is installed. In this case, this is not an ECM
48 ECM #3 Location: Exterior wall above grade Baseline construction: 2x6 R22 wall Upgrade: Add 2 mineral wool semi-rigid insulation board on outside of exterior walls. Annual energy saving: kwh Additional cost: $13,070.77
49 ECM #4 Location: Roof Baseline construction: R40 for both sflatand sloping ceiling roofs Upgrade: No upgrade is adopted in Zen House due to high cost Annual energy saving: 0 kwh Additional cost: $0
50 ECM #5 Location: All windows Baseline construction: Double glazing, clear glass, air infill, vinyl frame Upgrade: triple glazing, low-e coating, argon gas infill, insulated spacer, vinyl frame Annual energy saving: kwh Additional cost: $2,500.00
51 ECM #6 Location: Building envelope Baseline construction: normal air-tight construction, ACH = Pa Upgrade: high performance air-tight construction, ACH = Pa (actual air test result of ZEN House) Annual energy saving: kwh Additional cost: $3,539.44
52 ECM #7 Location: Heating System Baseline equipment: high efficient (90%) condensing gas furnace Upgrade: cold climate air source heat pump, heating HSPF 9.4, cooling, EER 12.0, SEER Annual energy saving: kwh Additional cost: $5,400.00
53 ECM #8 Location: Domestic hot water system Baseline equipment: medium efficient gas hot water tank Upgrade: condensing high efficient (90%) hot water boiler Annual energy saving: kwh Additional cost: $2,471.00
54 ECM #9 Location: Lighting and appliances Baseline equipment: normal lighting and appliances Upgrade: 70% LED lighting, 20% CFL lighting, energy star appliances and water saving plumbing fixtures Annual energy saving: kwh Additional cost: $1,000.00
55 ECM Cost-benefit Analysis - Initial Cost ECM Additional cost Annual energy saved (kwh) cost to save 1 kwh ICFplus 3 EPS to foundation wall $4, $1.71 3" EPS under base slab $1, $2.63 2" exterior Roxul to exterior wall $13, $3.26 Roof insulation from R40 to R50 NA NA NA Windows - Triple glazing $2, $1.15 Air-tightness - to R2000 standard $3, $0.51 Cold weather air source heat pump $5, $0.27 High efficient hot water tank $2, $1.13 Energy efficient lighting& appliances $1, $0.28
56 ECM has different service life Future electricity rate forecast based on BC Hydro 2011 IRP Technical Advisory Committee, Integrated Resource Plan, Long- Term Rate Forecast 2010 BC Hydro Residential Rate, Tier 1: $0.067 Assumed inflation 2.1% Use Equivalent-Annual-Annuity Approach
57 ECM Cost-benefit Analysis Service Life ECM Service life IRR Equivalent-Annual- Annuity (cents) ICF plus 3 EPS to foundation wall 50 5% " EPS under base slab 50 3% " exterior Roxul to exterior wall 50 2% 0.41 Roof insulation from R40 to R50 50 NA NA Windows - Triple glazing 30 6% 3.29 Air-tightness - to R2000 standard 40 15% 7.66 Cold weather air source heat pump 25 27% 6.56 High efficient hot water tank 25 5% 2.18 Energy efficient lighting& appliances 10 23% 4.01
58 Annual Green House Gas Emission (tonne): (11.688) ECM Service life GHG Reduction in Service Life Additional cost Add. Cost to save 1 tonne GHG ICFplus 3 EPS to foundation wall $4, $ " EPS under base slab $1, $ " exterior Roxulto exterior wall $13, $ Roof insulation from R40 to R50 50 NA NA NA Windows - Triple glazing $2, $ Air-tightness -to R2000 standard $3, $87.87 Cold weather air source heat pump $5, $ High efficient hot water tank $2, $ Energy efficient lighting& appliances $1, $62.58
59 Energy Performance of Zen House Site Energy in Heating Mode Only Estimated Annual Space Heating Energy Consumption (kwh): ( ) Ventilator Electrical Consumption: Heating Hours (kwh): (512.04) Estimated Annual DHW Heating Energy Consumption (kwh): ( ) ESTIMATED ANNUAL SPACE + DHW ENERGY CONSUMPTION (kwh): ( ) LESS 79% Eneguide Rating: 88 Note: Figures in bracket are Baseline House results
60 Annual Estimated Energy Consumption by Devices Site Energy in Heating Mode Only kwh Heating A/C HRV + fan DHW Appliance Total Baseline Zen House Zen House to baseline percentage 11% 0% 191% 43% 78% 33%
61 Baseline Heating A/C HRV + fan DHW Appliance Zen House
62 Estimated Annual Fuel Consumption Costs Site Energy in Heating Mode Only Electricity Gas Total Saving Saving in Percentage Baseline $ $1, $2, Zen House $ $ $1, $ %
63 Financial A analysis Total additional Cost for Energy Upgrade = $33, Mortgage for $33, Mortgage rate: 4.74% Amortization: 25 years Monthly payment = $ Annual payment = $2, Compare with Annual Fuel Consumption Costs: Heating mode only: $ Heat and Cooling mode: $1,030.72
64 Discussion Primary energy Cost effect due to fuel Air-conditioning Energy bill saving vs mortgage payment for additional cost for energy upgrade
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