Passive House. Briefing. Thurs Cork Institute of Technology Welcomes the Passive House Association of Ireland

Transcription

1 Passive House Briefing Cork Institute of Technology Welcomes the Passive House Association of Ireland Thurs

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3 Passivhaus is an evidence-based performance standard for buildings that delivers radically low-energy consumption, radically low CO 2 emissions, a healthy optimal indoor comfort with excellent air quality.

4 Passive House Standards Passive House Classic SHD<15kWh(m2)a and PE< 120kWh(m2)a Passive House Plus produces as much energy as it consumes Passive House Premium with surplus of energy EnerPHit renovated using certified components

5 context lower energy demand TGD part L dwellings NOW * ENERGY REDUCTION - 40% 60% NZEB PH Primary Energy (kwh/m 2 /yr) Building energy rating CO 2 Emission (kgco 2 /m 2 /yr) MPEPC NZEB attainable MPCPC BER B3 B1 A3 A2 A1 * based on kilkilleen PH 2015

6 Passive house performance CPC EPC PE BER NZEB A2 Carrigaline PH A3 Wayside PH A2? Kilkilleen PH A1

7 Passive Solar 2002 Off site construction Airtight membranes Airtight structure Moisture permeable Low running Costs

8 2006 Svendborg Stack ventilation Airtight structure Moisture permeable Running Costs < 300

9 PH applications Envelope performance Thermal bridge free Internal heat gains Ventilation 20,200m 3 /h

10 Applied

11 PH applications

12 Radiant asymmetry What it is Why do it? If none, ambient drop 2 C drop = 50% Heat Demand

13 Thermal bridge free design Thermal bridge factor BREGS TGD Part L 2011 U value + tb factor = Real U-value Wall U-value of 0.15 W/m 2 K = 0.3 W/m 2 K Wall U-value of 0.15 W/m 2 K = 0.23 Wm 2 K Wall U-value of 0.15 W/m 2 K = 0.17 Wm 2 K PH envelope measured to exterior = tb allowed for!

14 The cost of dismissing science U value with min TB U value with poor TB +!

15 Climate data Height / altitude above mean sea level Geodetic Longitude and Latitude Situation / site context Source: The Spatial Variation in Degree Days for Period in Ireland (by R. Fealy and R.M Fealy 2008) Source: Met eireann Thermal mass characteristics 3km temperate coastal margin Solar deprivation inland margin

16 Climate variations in Cork County Kanturk Watergrasshill Ballyvourney Youghal Carrigaline Castletownbere Garnish Island Dunmanway Clonakilty Crookhaven

17 Passive House - Cork Local construction - climate Airtight challenge Integrating components No conventional heating system Quality control

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19 Passive house performance Thermal bridge free design Indoor surface temperatures Solar control Window energy balance Losses Heat gains Balance kwh/m 2 kwh/m 2 kwh/m 2 area m 2 (% of wall) North (0.8%) East (2.9%) South (6.2%) West (1.2%) Horizontal (1.5%) Total (12.6%)

20 Variation in energy performance in Cork SHD <= 15 kwh/m²(a) Annual heat demand / Specific heat load as certified specifications SHL <= 10W/m² Carrigaline Clonakilty Crookhaven Garnish Island Castletownbere Dunmanway Ballyvourney Kanturk Watergrasshill SHD kwh/m2(a) SHL W/m

21 PH site 18 specific design 16 Annual heat demand / Specific heat load Carrigaline Valentia Malin Head Dublin Kilkenny Birr AHD kwh/m2(a) SHL W/m Designing without site specific climate data? 45% off in AHD alone!

22 U-values 0.82 W/m²K (1.6 W/m²K) air permeability: 0.58m³/m²/h (5m³/m²/h) W/m²K (0.16 W/m²K) W/m²K (0.21 W/m²K) Winter Garden 0.82 W/m²K (1.6 W/m²K) W/m²K (0.21 W/m²K) W/m²K (0.20 W/m²K) W/m²K (0.21 W/m²K or 0.15 with u/f heating) W/m²K (0.16 W/m²K) Note: u-values in brackets represent TGD 2011 elemental max. U-Values but do not necessarily indicate compliance

23 TGD 2011 Building Regulation levels Annual heat demand specific heat load at TGDL 2011 backstop levels & 5 ac/h as calculated in PHPP Carrigaline Valentia Malin Head Dublin Kilkenny Birr AHD kwh/m2(a) SHL W/m

24 Why? losses kwh/m 2 (a) Windows Roof Floor Wall Other Doors Infiltration Ventilation 2011 Building Regs losses Certified PH losses Source: WMA-Carrigaline PH losses compared - TGD L or Passivehouse classic

25 How much? % variance Floor insulation Timber frame Wall insulation Roof insulation Airtightness TB detailing Double vs Triple Glazing Space heating HRV installation Energy Controls Electrical installation Contractors supervision % proj. costs Source: RLA QS -Carrigaline PH losses compared - TGD L or Passivehouse classic Total %

26 Enerphit

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28 EnerPHit Retrofit projects 25 kwh(m2)a Primary Energy 1 ac 50 Pa n50 Dryline with caution U=<=0.35W/m 2 K Hygrothermal analysis recommended

29 WUFI Pro Condensation Saturation Materials Informed solutions A tool to predict moisture transfer in multilayer components of a building fabric

30 EnerPHit 1950s House, Bishopstown Rooflights kwh/(m²a) gain kwh/(m²a) loss east windows kwh/(m²a) gain kwh/(m²a) loss west windows kwh/(m²a) gain kwh/(m²a) loss south windows kwh/(m²a) gain kwh/(m²a) loss Annual Heat Demand 18.2kWh/(m²a) Specific Heat Load 12.4 W/m² Losses Heat gains Balance area m 2 kwh/m 2 kwh/m 2 kwh/m 2 (% of wall) North East (10.7%) South (5.1%) West (7.9%) Horizontal (0.4%) Total (23.7%)

31 February 10 am June 14.00

32 Ground Floor Layout Legend 1. Entrance Lobby 2. Hallway 3. Bathroom 4. Bedroom 5. Utility 6. Pantry 7. Kitchen 8. Dining 9. Living 10.Study 11.Sunroom

33 First Floor Layout Legend 1. Entrance Lobby 2. Hallway 3. Bathroom 4. Bedroom 5. Utility 6. Pantry 7. Kitchen 8. Dining 9. Living 10.Study 11.Sunroom

34 Window Energy Balance Rooflights kwh/(m²a) gain kwh/(m²a) loss north windows kwh/(m²a) gain kwh/(m²a) loss west windows kwh/(m²a) gain kwh/(m²a) loss east windows kwh/(m²a) gain kwh/(m²a) loss south windows kwh/(m²a) gain kwh/(m²a) loss Losses Heat gains Balance area m 2 kwh/m 2 kwh/m 2 kwh/m 2 (% of wall) North (3.8%) East (5.5%) South (4.2%) West (7.2%) Horizontal (1.7%) Total (20.7%)

35 U-values air permeability: 0.6m³/m²/h (5m³/m²/h) 0.76 W/m²K (1.6 W/m²K) W/m²K (0.16 W/m²K) 0.76 W/m²K (1.6 W/m²K) W/m²K (0.21 W/m²K) W/m²K (0.21 W/m²K 0.15 with u/f heating) W/m²K (0.21 W/m²K) Note: u-values in brackets represent TGD 2011 elemental max. U-Values but do not necessarily indicate compliance

36 Passive House Performance Overall Passive House Performance Space Heating Heating Demand 14 kwh/(m 2 a) Heating Load 9 W/m 2 Space Overall specific space Cooling cooling demand 1 kwh/(m 2 a) Cooling Load 3 W/m 2 Primary Energy Incl. Heating, cooling, auxiliary electricity 106 kwh/(m 2 a)

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38 Ground Floor Layout Legend 1. Entrance Lobby 2. Hallway 3. Bathroom 4. Bedroom 5. Plant Room 6. Utility 7. Pantry 8. Kitchen 9. Dining 10.Living 11.Study 12.Roof Garden

39 First Floor Layout Legend 3. Bathroom 4. Bedroom 10. Living 12. Roof Garden

40 Passive house performance Losses kwh/m 2 Heat Gains kwh/m 2 Balance kwh/m 2 area m 2 (% of wall) North (2.2%) East (3.9%) South (13.0%) West (10.3%) Roof Total (29.3%)

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42 Thermal envelope air permeability: 0.6 ac/h W/m²K 0.6 W/m²K 0.12 W/m²K W/m²K W/m²K W/m²K W/m²K W/m²K Air Tight Layer

43 Passive house performance Overall Passive House Performance Space Heating Heating Demand 7 kwh/(m 2 a) Heating Load 8 W/m 2 Overall specific space cooling Space Cooling demand 2 kwh/(m 2 a) Cooling Load 0 W/m 2 Primary Energy Incl. Heating, cooling, auxiliary electricity 98 kwh/(m 2 a)

44 Specific Climate data

45 Can we deliver PH? Highest density PH professionals per capita 350 already trained CEPHD CEPHC PH tradesperson passivehouseplus.ie Munster Joinery Eco timber frame PH academy Commercial Domestic Industrial Breaking news: Dunlaoghaire Rathdown propose PH as an acceptable standard in their Dev Plan

46 Further information The Passive House Institute or The International Passive House Association Certified Passive House Designers / Consultants Passive House Association of Ireland Passipedia Passivehouseplus.ie Wain Morehead Architects Ltd.