Passive House Exam Preparation (sample pages)

Harrmann Consulting | May 2016

Exam Preparation for

Certified Passive House Designer (CPHD) Certified Passive House Consultant (CPHC)

Prepared and presented by:

André Harrmann Dipl.-Ing. (FH), MHP, CPHD, LEED AP


This is not a complete set of exam prep material – only a few selected slides

Disclaimer


Calculate Window U-Value

Awindow = wwindow × hwindow = Total window area = 1.23m × 1.48m = 1.820m2

Aglass = wglass × hglass = Glazing area = = (1.23-0.117-0.117)m × (1.48-0.117-0.134)m = 0.996×1.229 = 1.224m2

Aframe = Awindow - Aglass = Total window frame area = 1.820m2 - 1.224m2 = 0.596m2

Lspacer = Lglass = 2 × wglass + 2 × hglass = spacer length (0.996+1.229)m × 2 = 4.45m

Linstall = Lframe = 2 × wwindow + 2 × hwindow = Window frame = = (1.23+1.48)m × 2 = 5.42m

h w

indo

w =

1.48

m

wwindow = 1.23m

h gla

ss =

1.2

29m

wglass = 0.996m

Aglass

Aframe

0.117m

0.134m

0.11

7m

0.11

7m


Rank these windows for energy performance 1 Window width 1.0 m 2 Window width 1.0 m

Window height 2.0 m Window height 2.0 mFrame width (side, head) 0.10 m Frame width (side, head) 0.15 mFrame width (sill) 0.10 m Frame width (sill) 0.15 mU-Value Glas 0.6 W/m2K U-Value Glas 0.6 W/m2KU-Value Frame 1.6 W/m2K U-Value Frame 1.6 W/m2KPSI - Spacer 0.08 W/mK PSI - Spacer 0.08 W/mKPSI - Installation 0.04 W/mK PSI - Installation 0.04 W/mKA - Window m2 A - Window m2A - Glass m2 A - Glass m2A - Frame m2 A - Frame m2L - Spacer m L - Spacer mL - Install m L - Install mU - Window W/m2K U - Window W/m2KU - Window,installed W/m2K U - Window,installed W/m2K

3 Window width 2.0 m 4 Window width 2.0 mWindow height 3.0 m Window height 3.0 mFrame width (side, head) 0.15 m Frame width (side, head) 0.15 mFrame width (sill) 0.15 m Frame width (sill) 0.15 mU-Value Glas 0.6 W/m2K U-Value Glas 0.6 W/m2KU-Value Frame 1.6 W/m2K U-Value Frame 1.6 W/m2KPSI - Spacer 0.08 W/mK PSI - Spacer 0.08 W/mKPSI - Installation 0.04 W/mK PSI - Installation 0.20 W/mKA - Window m2 A - Window m2A - Glass m2 A - Glass m2A - Frame m2 A - Frame m2L - Spacer m L - Spacer mL - Install m L - Install mU - Window W/m2K U - Window W/m2KU - Window,installed W/m2K U - Window,installed W/m2K



Window height 2.0 m Window height 2.0 mFrame width (side, head) 0.10 m Frame width (side, head) 0.15 mFrame width (sill) 0.10 m Frame width (sill) 0.15 mU-Value Glas 0.6 W/m2K U-Value Glas 0.6 W/m2KU-Value Frame 1.6 W/m2K U-Value Frame 1.6 W/m2KPSI - Spacer 0.08 W/mK PSI - Spacer 0.08 W/mKPSI - Installation 0.04 W/mK PSI - Installation 0.04 W/mKA - Window 2.000 m2 A - Window 2.000 m2A - Glass 1.440 m2 A - Glass 1.190 m2A - Frame 0.560 m2 A - Frame 0.810 m2L - Spacer 5.200 m L - Spacer 4.800 mL - Install 6 m L - Install 6 mU - Window W/m2K U - Window W/m2KU - Window,installed W/m2K U - Window,installed W/m2K

3 Window width 2.0 m 4 Window width 2.0 mWindow height 3.0 m Window height 3.0 mFrame width (side, head) 0.15 m Frame width (side, head) 0.15 mFrame width (sill) 0.15 m Frame width (sill) 0.15 mU-Value Glas 0.6 W/m2K U-Value Glas 0.6 W/m2KU-Value Frame 1.6 W/m2K U-Value Frame 1.6 W/m2KPSI - Spacer 0.08 W/mK PSI - Spacer 0.08 W/mKPSI - Installation 0.04 W/mK PSI - Installation 0.20 W/mKA - Window 6.000 m2 A - Window 6.000 m2A - Glass 4.590 m2 A - Glass 4.590 m2A - Frame 1.410 m2 A - Frame 1.410 m2L - Spacer 8.800 m L - Spacer 8.800 mL - Install 10 m L - Install 10 mU - Window W/m2K U - Window W/m2KU - Window,installed W/m2K U - Window,installed W/m2K



Window height 2.0 m Window height 2.0 mFrame width (side, head) 0.10 m Frame width (side, head) 0.15 mFrame width (sill) 0.10 m Frame width (sill) 0.15 mU-Value Glas 0.6 W/m2K U-Value Glas 0.6 W/m2KU-Value Frame 1.6 W/m2K U-Value Frame 1.6 W/m2KPSI - Spacer 0.08 W/mK PSI - Spacer 0.08 W/mKPSI - Installation 0.04 W/mK PSI - Installation 0.04 W/mKA - Window 2.000 m2 A - Window 2.000 m2A - Glass 1.440 m2 A - Glass 1.190 m2A - Frame 0.560 m2 A - Frame 0.810 m2L - Spacer 5.200 m L - Spacer 4.800 mL - Install 6 m L - Install 6 mU - Window 1.088 W/m2K U - Window 1.197 W/m2KU - Window,installed 1.208 W/m2K U - Window,installed 1.317 W/m2K

3 Window width 2.0 m 4 Window width 2.0 mWindow height 3.0 m Window height 3.0 mFrame width (side, head) 0.15 m Frame width (side, head) 0.15 mFrame width (sill) 0.15 m Frame width (sill) 0.15 mU-Value Glas 0.6 W/m2K U-Value Glas 0.6 W/m2KU-Value Frame 1.6 W/m2K U-Value Frame 1.6 W/m2KPSI - Spacer 0.08 W/mK PSI - Spacer 0.08 W/mKPSI - Installation 0.04 W/mK PSI - Installation 0.20 W/mKA - Window 6.000 m2 A - Window 6.000 m2A - Glass 4.590 m2 A - Glass 4.590 m2A - Frame 1.410 m2 A - Frame 1.410 m2L - Spacer 8.800 m L - Spacer 8.800 mL - Install 10 m L - Install 10 mU - Window 0.952 W/m2K U - Window 0.952 W/m2KU - Window,installed 1.019 W/m2K U - Window,installed 1.286 W/m2K

#1

#2

#3

#4


Windows and Economics Passive House certified windows are specified for a single family house (150m2 TFA). The project has 30m2 window area and the overall Uw,installed is 0.80W/m2K. The site is in an area with 67kKh/a and the assumed design temperature is -2°C. The calculated Space Heat Demand is 2,000kWh/a and the Heating Load is 1.15kW as calculated with PHPP. The client wants so safe money and suggests to install windows which are $50 cheaper per m2. These alternative windows have the same glazing option and frame geometry, but different frame material, resulting in overall Uw,installed = 1.40W/m2K. Life expectancy of both window options is 20 years. You are requested to evaluate the financial viability of that decision and to determine if the PH criteria for heating demand and load would still be met. Assumed fuel cost are 0.10$/kWh. Nominal interest rate is 5% and inflation is 1%.


Windows and Economics

• Increased Heating Demand is total Heating Demand ≤ 10 W/m2 • Increased Heat Load is total Heat Load ≤ 15 kWh/(m2a)? • Increased Heating Demand annual extra cost for heating • Compare annual extra cost for energy < potential investment savings? Net Present Value

What needs to be calculated?

Passive House certified windows are specified for a single family house (150m2 TFA). The project has 30m2 window area and the overall Uw,installed is 0.80W/m2K. The site is in an area with 67kKh/a and the assumed design temperature is -2°C. The calculated Space Heat Demand is 2,000kWh/a and the Heating Load is 1.15kW as calculated with PHPP. The client wants so safe money and suggests to install windows which are $50 cheaper per m2. These alternative windows have the same glazing option and frame geometry, but different frame material, resulting in overall Uw,installed = 1.40W/m2K. Life expectancy of both window options is 20 years. You are requested to evaluate the financial viability of that decision and to determine if the PH criteria for heating demand and load would still be met. Assumed fuel cost are 0.10$/kWh. Nominal interest rate is 5% and inflation is 1%.


Windows and Economics Passive House certified windows are specified for a single family house (150m2 TFA). The project has 30m2 window area and the overall Uw,installed is 0.80W/m2K ↑ OPTION #1 windows which are $50 cheaper per m2. These alternative windows have the same glazing option and frame geometry, but different frame material, resulting in overall Uw,installed = 1.40W/m2K OPTION #2



A × ΔU × ft × Gt = QT,Δ 30 m2

(1.40-0.80) W/(m2K)

1 67 kKh/a

1,206 kWh/a

Heat Demand Increased Transmission Heat Losses QT = A × U × ft × Gt

Increased demand with cheaper windows

QT,Δ / TFA = qT,Δ 1,206 kWh/a

150 m2

8.04 kWh/(m2a)

Total demand

+ q#1 = q#2 2,000/150 kWh/(m2a)

21.37 kWh/(m2a)

> 15 kWh/(m2a)



A × ΔU × ft × Δt = PT,Δ 30 m2

(1.40-0.80) W/(m2K)

1 (20+2) K

396 W

Heating Load Increased Transmission Heat Losses PT = A × U × ft × Δt1 or t2

Increased load with cheaper windows

PT,Δ / TFA = pT,Δ 396 W

150 m2

2.64 W/m2

Total load

+ p#1 = p#2 1,150/150

W/m2 10.31 W/m2

= 10 W/m2 criteria met



Annual Extra cost for heating = Energy Demand × Cost of Fuel = 8.04kWh/(m2a) × 150m2 × 0.10$/kWh = 1,206kWh/a × 0.10 $/kWh = 120.60$/a

Compare annual extra cost vs. saved capital cost Net Present Value of extra cost

Saved Capital Cost = 30m2 × 50$/m2 = 1,500$ < 1,644.81$ extra fuel cost are higher than capital cost savings advise client that cheaper windows are not recommended in this case


Exam Preparation – practical things

Source: PHI

• Pimp your course binder – use dividers, markers, highlighters • Organize a “cheat-sheet” – all the formulas gathered in one place • Copy the symbols and definition pages from PHPP handbook • Bring the PHPP handbook • Prepare floor plans, sections and elevations of a generic house

with all the criteria relevant for a Passive House • Bring color markers, rulers, pens (pencils are not allowed) • Make sure you know how to work your calculator (yx) • Bring spares of everything • Read the PHI’s exam regulations and learning targets

www.passivhausplaner.eu


Exam Preparation – practical things

Source: PHI

• Organize a “cheat-sheet” – all the formulas gathered in one place prepare your own from scratch or see what others have done: www.15kwh10w.com/passive-house-tools


Good Luck!

André Harrmann www.15kwh10w.com

Engineering

Passive House Exam Preparation (sample pages)