Last modified by the author on 29/06/2015 - 12:47


  • Building Type : Collective housing > 50m
  • Construction Year : 1982
  • Delivery year : 2011
  • Address 1 - street : meritxell 30 00500 ANDORRA LA VELLA, ANDORRA, Andorra
  • Climate zone : [Cfc] Marine Cool Winter & summer- Mild with no dry season.

  • Net Floor Area : 2 300 m2
  • Construction/refurbishment cost : 340 000 €
  • Number of Dwelling : 24 Dwelling
  • Cost/m2 : 147.83 €/m2

Proposed by :

Certifications :

  • Primary energy need
    4.5 kWhpe/m2.year
    (Calculation method : )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

Reformed building with 27 apartments, applying energy efficiency criteria.

It’s situatedin an alpine zone.

The winter’s minimum temperature is -12°C.

Reduced heating consumption by 82%.

Acting on facade insulation and heating system: thermographic study, 15 to 20cminsulation, triple glazing LowE, blower door test, etc.

See more details about this project



Contracting method

Separate batches

Type of market

Table 'c21_maroc.rex_market_type' doesn't exist

Building users opinion

Users are happy because their heating cost is very low and the comfort has increased.
Owner is happy too because he can grow up the price to rent the apartments, even if the users pays less than before (because the heating cost). He is happy too because he has a waiting list to rent their apartments.

Energy consumption

  • 4,50 kWhpe/m2.year
  • 55,00 kWhpe/m2.year
  • heating made by central heat pump. Consumption 4.5 kWh/m2/year
    hoot water production by heat pump. consumption 21 kWh/m2/year
    lighting 104.5 kWh/m2/year

  • 212,00 kWhpe/m2.year

Envelope performance

  • 0,24 W.m-2.K-1
  • Primary facade, U=0.24 W/m2/K
    Secondary facade U=0.34 W/m2/K
    Facade to neighbor U=0.27 W/m2/year

  • 2,90
  • 2,40

Real final energy consumption

    130,00 kWhfe/m2.year

    130,00 kWhfe/m2.year

    4,64 kWhfe/m2.year

    2 013


    • Heat pump
    • Water radiator
    • Heat pump
    • No cooling system
    • Natural ventilation
    • No renewable energy systems
  • 100,00 %
  • solar gains control by blinds

Smart Building

    Control on/off, viewer of any parameter like temperatures, % opened of motorized valve, pump parameters (% velocity, flow, pressure, energy), instant and cumulated electrical and thermal energy consumption

    facility controlled by a Desigo Insight central control by Siemens

Urban environment

    Building in Andorra la Vella down town, shopping zone

  • 350,00 m2
  • 100,00 %


    rockwool external pipe insulation 2x5cm each pipe

    exterior pipe insulation

    very good insulation with this thickness

    daikin heat pump

    Heat pump for heating low temperature (max 50ºC) and high efficiency COP between 2.84 to 3.77, ESEER 3.78.
    It works at proportional temperature to outdoor temp to achieve always maximum COP.

    We use with this heat pump, existing old radiators (high temperature and high emission) to heat this buiding after refurbishment, working at low temperature and low emission.

    daikin altherma for DHW

    High temperature heat pump to produce domestic hot water (DHW)

    Produces low cost hot water. No problems

    grundfos magna 3 for heating and DHW

    Electronic pump with connection to BMS control system, data transmission: pressure (bar), flow (m3/h), instant consumption (W), cumulate consumption (kWh), thermal flow (kWh).
    Working at constant temperature function (hot water production) or at constant pressure function (for heating facility)

    Sometimes the pump stops without any order

Construction and exploitation costs

  • 35 000,00
  • 22 000
  • 340 000
  • 30 000

Building candidate in the category

Low energy renovation

Low energy renovation

Green Building Solutions Awards 2015

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Author of the page

jordi llovera

Director de proyectos sostenibles

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Green Building Solutions Awards 2015