EnerPHit for Social Apartments
Marrying Old and New
20th IPHC_Darmstadt_Presented by Mariana Moreira
MosArt Architects & Passive House Academy
EuroPHit project case study _ CS01
Case Study Overview – Original Situation
Northwest view
Southeast view
Two-storey block of 34 apartments with modest
size common facilities (kitchen and dining room)
Built during the early 1970’s
Floor, internal walls and roof - poured concrete
with little or no insulation incorporated
External walls - concrete panels with pebble
dash finish
Solar gains with heavy shading to the Northwest
and quite open to the Southeast
Plant room on the roof accommodating a low
efficiency oil-fired boiler
BeforeDuring
After/current
Relatively low floor to ceiling height (challenge - ventilation ducting for the retrofitting proposal)
Ventilation is mostly natural, using opening window sections and room-based fans
Internal view of communal area on the first floor
Case Study Overview – Original Situation
BeforeDuring
After/current
Existing concrete
wall panels:
U Value
3.75 W/m²K
Externally
insulated with
200mm EPS
U Value proposed
0.15 W/m²K
Externally
insulated with
250mm EPS
U Value proposed
0.12 W/m²K
BACK FACADE
New Wall:
215 mm aerated
block externally
insulated with
200mm EPS
U Value:
0.13 W/m²K
FRONT FACADE
150mm EPS
U Value:
0.16 W/m²K
Existing Floor: 150 mm concrete floor
U Value 4.30 W/m²K
EnerPHit Proposal – Section
BeforeDuring
After/current
New Roof:
Insulated metal deck with
50mm sound insulation
150mm PIR insulation
U Value:
0.13 W/m²K
Window Cill detail
Main Contractor Proposal
EnerPHit On Site – Recessed Window
BeforeDuring
After/current
Window Cill detail in Therm
Main Contractor Proposal
EnerPHit On Site – Recessed Window
BeforeDuring
After/current
45% better!
Ψ Value = Ψ Value =
Steel angle
causing a massive
thermal bridge
Steel angle
25 mm set back
from the edge of
the insulation layer
EnerPHit – Flush Window
BeforeDuring
After/current
EnerPHit On Site – Door Head Details
BeforeDuring
After/current
. . . as per tender drawings
Glazed Door Position . . .
. . . as required by door manufacturer
. . . as required by door manufacturer with 20mm of insulation overlap.
EnerPHit On Site – Door Head Details
BeforeDuring
After/current
. . . as per tender drawings
Glazed Door Position . . .
. . . as required by door manufacturer
. . . as required by door manufacturer with 20mm of insulation overlap.
Psi value = 0.030 W/mK Psi value = 0.441 W/mK Psi value = 0.387 W/mK
at construction stage
EnerPHit On Site – Existing Foundation Detail
BeforeDuring
After/current
at tender stage
Internal Surface Temperature
>15 ºC
Minimum required height from top of foundation to top of floor slab: 290 mm
To assure that at skirting level the surface temperature is above 15 ºC
EnerPHit On Site – Existing Foundation Detail
BeforeDuring
After/current
In below / In above Out below / In above Out below/ Out above
EnerPHit On Site – Airtight Line Journey
BeforeDuring
After/current
on site – internal walls demolition
1st Option:
Decentralised system
Advantages:
High overall HRV efficiency
Reduced duct nominal width
Disadvantages:
High capital cost
High maintenance level
2nd Option:
Centralised system
Advantages:
Low capital cost
Low maintenance level
Disadvantages:
Low HRV efficiency
Increase duct nominal width
Fire dampers required (cost)
Parapet height increased
Load bearing structure (cost)
3rd Option:
4 Centralised system
Disadvantages:
Low HRV efficiency
Increase duct nominal width
Fire dampers required (cost)
Parapet height increased
Load bearing structure (cost)
Advantages:
Low capital cost
Low maintenance level
Back to 1st Option
Decentralised system agreed
EnerPHit Proposal – Ventilation Journey
BeforeDuring
After/current
EnerPHit Proposal – Ventilation Journey
"We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time"
'Little Gidding' (poem)
By T S Eliot
BeforeDuring
After/current
Cost to heat this building to 20 ºC 24/7/365
€53,000 per year
PHPP – Energy Balance
BeforeDuring
After/current
Cost to heat this building to 20 ºC 24/7/365
€ 4 000 per year
At least 80% reduction of heat demand
PHPP – Energy Balance
BeforeDuring
After/current
So what did all this cost?
BeforeDuring
After/current
Additional cost to achieve EnerPHit
on this project:
9%
- At design stage carry out an air leakage search
A way to learn more about the existing fabric
EnerPHit – Lessons Learned
- At design stage carry out an air leakage search
A way to learn more about the existing fabric
- At tender stage specify in detail each transparent component
G values, Uf values for each frame/glass type
EnerPHit – Lessons Learned
- At design stage carry out an air leakage search
A way to learn more about the existing fabric
- At tender stage specify in detail each transparent component
G values, Uf values for each frame/glass type
- Programme in preliminary pressurisation tests for the entire building
Contractor to price for temporary seals for this
preliminary tests
EnerPHit – Lessons Learned
- At design stage carry out an air leakage search
A way to learn more about the existing fabric
- At tender stage specify in detail each transparent component
G values, Uf values for each frame/glass type
- Programme in preliminary pressurisation tests for the entire building
Contractor to price for temporary seals for this
preliminary tests
- Select Main Contractor with training and experience in Passive House construction
it will save hours of discussions (time is money)
EnerPHit – Lessons Learned
- At design stage carry out an air leakage search
A way to learn more about the existing fabric
- At tender stage specify in detail each transparent component
G values, Uf values for each frame/glass type
- Programme in preliminary pressurisation tests for the entire building
Contractor to price for temporary seals for this
preliminary tests
- Select Main Contractor with training and experience in Passive House construction
it will save hours of discussions (time is money)
- When selecting windows/doors check if construction fitting detail is acceptable from
the manufacturer point of view
structure and weather future proof
EnerPHit – Lessons Learned
- At design stage carry out an air leakage search
A way to learn more about the existing fabric
- At tender stage specify in detail each transparent component
G values, Uf values for each frame/glass type
- Programme in preliminary pressurisation tests for the entire building
Contractor to price for temporary seals for this
preliminary tests
- Select Main Contractor with training and experience in Passive House construction
it will save hours of discussions (time is money)
- When selecting windows/doors check if construction fitting detail is acceptable from
the manufacturer point of view
structure and weather future proof
- On site supervision
its crucial
EnerPHit – Lessons Learned