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Mercado del Val, Valladolid (Spain)

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Mercado del Val is an iron market whose construction was completed in 1882 and it is located within the old town of Valladolid, Spain, being currently the oldest preserved market in the city. In 2013, the market was fully renovated recovering a late 19th century representative building of an architecture and commercial activity from that period, being respectful with its essence, but transforming it into an innovative building that meets the potentialities and commercial needs of the 21st century.

 

AIM OF RETROFIT

 

The planned intervention aimed to recover a late nineteenth century building representative of an architecture and commercial activity from that period, being respectful with its essence, but transforming it into an innovative building that meets the potentialities and commercial needs of the XXI century.

 

RETROFIT SOLUTIONS

 

External walls: The old wall was replaced by a new glazing façade. The glazed façade is made by modular façade elements that aim at integrating thermal, daylighting and ventilation functions being responsive when internal and external loads change. The old brick wall from 1982 was not catalogued as a heritage part of the building.

  • U-value (pre-intervention) [W/m2K]: 0,738 W/m²K
  • U-value (post-intervention) [W/m2K]: 1,29 W/m²K

Windows: New glazing façace and windows for the natural ventilation. The glazing façade increase daylighting and make the commercial activities visible from the outside. The original windows and skylights were not catalogued as a heritage part of the building.

  • Existing window U-value Glass [W/m2K]: 5,8
  • New window U-value Glass[W/m2K]: 1,29
  • Existing window U-value Frame [W/m2K]: 0,0
  • New window U-value Frame [W/m2K]: 1,29

HVAC: Heating is covered with three reversible geothermal heat pumps getting temperature from vertical bareholes done in the ground (42 bareholes of 120 m). To cover the energy needs it has been selected a low temperature heating and cooling system with radiant floor on the ground floor and first floor and fan coils in the basement. The is also an AHU which can work also in free-cooling mode and has a heat recovery efficiency of more than 65%.

 

New AHU (Air Handling Unit). Natural ventilation strategies using the windows and skylights implemented in the contol system. When Natural Ventilation covers copletely the ventilation needs of the market, the AHU is OFF. In the old building there was no mechanical ventilation system. Natural ventialtion was performed through doors and windows.

 

Cooling is covered with three reversible geothermal heat pumps getting temperature from vertical bareholes done in the ground (42 bareholes of 120 m). To cover the energy needs it has been selected a low temperature heating and cooling system with radiant floor on the ground floor and first floor and fan coils in the basement.

 

For the DHW the geothermal heat pumps are supported by storage tanks with electric immersion heaters for legionella prevention. The geothermal heat pumps can produce at the same time DHW and cooling in summer.

 

ENERGY USE

 

Primary energy: Consumption_estimation_Before: 1300,2 kWh/m2.y
Consumption_estimation_After: 326,9 kWh/m2.y

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