Passive swimming pool in Sulejów’s primary school, Poland

Public nZEB buildings case study
Building type
Public School Sports
Project type
New Construction

© Municipality of Sulejów

How was this building procured?

In the tender documentation, the Contracting Authority  asked the bidders to prove that they have the necessary knowledge and experience to perform the works. In regard to this, the selection criteria included providing proof of having performed the construction of at least one building with a certificate in accordance with PN-EN ISO 9972:2015-10 standard. It also required experience with the execution of at least one building in which a geothermal pump with vertical collectors is installed with a minimum heating capacity of 15 KW. As well as experience with the construction of a swimming pool building with a reinforced concrete basin structure, with a water surface of at least 60m2.

The selection criteria also described the professionals required to deliver the project. Additional points were awarded in case of further experience on these minimum requirements.

Moreover, the tender included contract performance clauses such as the obtention of a n50 leak test (measuring the air tightness of a building), to be performed after the installation of the windows. During the construction phase, the contractor also had to prepare and transport suitable for reuse, and to replant the trees removed in the space for the construction.

What are the key nZEB features?

A test was conducted in the swimming pool in 2021 regarding the air-tightness of the building, and it met the passive building requirements (0.16 l/h). In addition, the building’s key features related to nZEB include:

  • High-air insulation;
  • High-efficiency energy-saving Light Emitting Diode (LED) luminaires;
  • Independent heat sources and heat recovery systems.
Did the project have an impact on skills?

By requiring the bidders to provide proof that they have experience with constructing a building that passes an airtightness test, the Contracting Authority sent a signal to the market that these technical skills are valued. This in turn can encourage other contractors to upskill their airtightness techniques and other relevant nZEB skills. These requirements, together with the criteria regarding the experience and knowledge of the personnel involved in the project, shows that public authorities can have a direct influence on skill requirements.

Keywords: Passive buildings, Swimming pool, Poland, nZEB, Sustainable public procurement
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