EnerPHit for Social Apartments - Passive house for Social Apartments ... External walls - concrete panels with pebble dash finish ... Disadvantages: High capital cost

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

Before

During

After/Current

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

Case Study Overview – PHPP 9.3 Results

BeforeDuring

After/current

EnerPHit Proposal – Floor Plans

BeforeDuring

After/current

Additional Floor

EnerPHit Proposal – Elevations

BeforeDuring

After/current

Front Facade

Back Facade

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

EnerPHit On Site – Window Positioning

BeforeDuring

After/current

Recessed

Flush

EnerPHit Proposal – Recessed Window

BeforeDuring

After/current

Window Cill detail in Therm

EnerPHit Proposal – Recessed Window

BeforeDuring

After/current

Window Cill detail

Main Contractor Proposal

EnerPHit On Site – Recessed Window

BeforeDuring

After/current

Window Cill detail in Therm

Main Contractor Proposal


BeforeDuring

After/current

45% better!


BeforeDuring

After/current

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

EnerPHit On Site – Airtight Line Challenges

BeforeDuring

After/current

EnerPHit On Site – Airtight Taping

BeforeDuring

After/current

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

EnerPHit On Site – Ventilation

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%

PHPP 9.3 – Energy Balance At the moment

BeforeDuring

After/current

- At design stage carry out an air leakage search

A way to learn more about the existing fabric

EnerPHit – Lessons Learned



- 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








preliminary tests

- Select Main Contractor with training and experience in Passive House construction

it will save hours of discussions (time is money)








preliminary tests



- When selecting windows/doors check if construction fitting detail is acceptable from

the manufacturer point of view

structure and weather future proof








preliminary tests



- 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


Thank You

Mariana Moreira

[email protected]

Documents

EnerPHit for Social Apartments - Passive house for Social Apartments ... External walls - concrete panels with pebble dash finish ... Disadvantages: High capital cost