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Retrofit Project

Pasilan Konepaja Power Station

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Year: 2020
Duration and Role: 4 months group project
Typology: retrofit to community centre
Location: Helsinki, Finland
Site area: 18,000m
²
Total build area: 850m²

Built in 1901, Pasilan Konepaja is one of the oldest Finnish Railway stations in Helsinki. Our project aimed at the retrofit of the 850m2 Power Station to the buildings on site.


The brief was developed to reflect the building’s historic importance in a culturally significant location whilst addressing the environmental challenges of the harsh climate in Helsinki.


Airtightness measures, reduction in thermal bridging, ventilation strategies and use of renewable energy sources were factors that added to the complexity of the project. The structural system involved a ‘building within a building’ approach so as to retain the integrity of the exterior historic building fabric. The wall and roof construction details were optimized to significantly reduce the energy use intensity of the building.


Considering the relationship between the few daylight hours and depression rates in Finland, our objective was also to improve light quality within the building to strengthen the mental health of its occupants.

Existing Building Analysis

Project Overview

Existing Building Analysis

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Prevailing wind from the south west direction

Toxic chemicals in the roof construction

Annual energy consumption: 722kwh/m2.yr

Angle of incidence low in winter / high in summer

Low radiation in the winter

Pre-cast concrete slab creates extremely lo indoor illuminance (0-80 lux annually)

Inefficient ventilation

Frequent infiltration at openings

Thermal bridging

Load-bearing external walls double brick 

Pile foundations stone pilasters for structural integrity

Building within a building

Building within a building

NEW ROOF

EXISTING STEEL TRUSS AND

NEW BEAMS

(cut at each end to avoid thermal bridging and supported via recyled steel I beams which sit inside and outside to the internal walls)

NEW INTERNAL WALL AND INSULATION

(400mm taller than existing to accommodate new roof thickness and  avoid thermal bridging)

EXISTING BUILDING EXTERNAL WALLS

NEW EXTENSION WITH 60% GLAZING

(connects to new roof and walls)

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Visuals

Visuals

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Renewable Energy Systems

Renewable Electricity Systems

VERTICAL AXIS WIND TURBINE

SOLAR PANELS AND PHOTOVOLTAIC GLASS

Compensates for more that 40% of energy use

RAINWATER COLLECTION AND HARVESTING

stored in an underground tank and distributed around the konepaja paslian site

UNDERFLOOR HEATING SYSTEM

connected to the ground and mezzanine levels

CONNECTED TO THE OPEN PLAN POWER STATION SYSTEMS ROOM

30% virgin aggregate replaced with recycled concrete aggregate for the piles, making RAC suitable for structural use

GEOTHERMAL PILES

high efficiency ground source heat pump

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PREVAILING WIND DIRECTION

from south

VERTICAL AXIS WIND TURBINE

40-60% efficiency

SKYLIGHTS

to improve illuminance levels

HVAC INLET DUCT

pre-heated incoming air

PHOTOVOLTAIC PANELS

compensates for more than 40% of energy use

VAWT SUPPORT

steel

HVAC EXHAUST DUCT

heat recovery from stale air

in winter, thermal energy from the exhaust air is tranferred to the incoming air, thus pre-heating it. this process is carried out by means of the heat recovery pipes and assisted by Intelligent Passive Stack

NILON FILAMENTS

to control drought

METAL RUNGS

for access and maintenance 

HEAT RECOVERY PIPES

ACCESS DOOR

entry to chimney

Builing Fabric

Building Fabric

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Energy & Carbon

Energy & Carbon Calculations

BEFORE RETROFIT
designbuilder outputs

Fuel consumption: 343.2Wh/m²/yr

CO₂ footprint: 100.4065kg/m²x10³/yr

AFTER IMPROVEMENT OF BUILDING FABRIC
designbuilder outputs

Fuel consumption: 158.95kWh/m²/yr
(54% reduction)

CO₂ footprint: 41.19kgCO₂/m²x10³/yr
(58.3% reduction)

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CARBON OFFSETTING

addition of renewables: -28.318kgCO₂/m²x10³/yr


FINAL CARBON ESTIMATION OF THE BUILDING FOOTPRINT AFTER RETROFIT: 12.872 kgCO₂/m²x10³/yr
(87.18% reduction)

LIFE-CYCLE EMBODIED CARBON

Extracting quantities from the REVIT model, total life-cycle embodied carbon calculations were carried out using the FCBS Carbon Tool. 

The output indicated a total embodied carbon of 477 kgCO₂e/m² which falls within the RIBA 2030 benchmark.

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60 year carbon impact

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