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Energy efficiency in the retail sector:

Supermarket in Poland reduces energy requirement with AWADUKT Thermo antimicrobial

By optimising the energy management of the TESCO supermarket in Oppeln, Poland, the energy requirement compared to traditionally-built upermarkets is significantly reduced. Thereby the natural energy sources like solar, wind and ground-source energy were used. To exploit ground-source energy, a ground-air heat exchanger (GAHE) was installed to pre-cool the air in the summer and pre-heat the air in the winter, saving energy costs.

To confirm the previously calculated saving of energy e.g. over 20 000 kWh per year alone by the AWADUKT Thermo ground-air heat exchanger, Rehau decided in cooperation with the Technical University in Poznań (Politechnika Poznanska) to performed a one-year research project for the project TESCO Oppeln / Zdzieszowice. After the opening of the supermarket, the test began in April 2007. One year of measurement started- and the results confirm the high efficiency of AWADUKT Thermo.

Tesco, Poland

Project: TESCO supermarket in Zdzieszowice in Oppeln (Poland)
Client:TESCO Polska Sp z o.o.
Installer: GLOBAL-TECH

REHAU System:
The ground-air heat exchanger AWADUKT Thermo antimicrobial exploits the constant temperature of the soil to pre-tempering the outdoor air. In connection with a ventilation and heat recovery system, an efficient fresh air supply is guaranteed. The special antimicrobial coating inside the pipe prevents microbial growth and helps ensure a supply a fresh, filtered air into the building.

With an annual heating demand of approximately 45,000 kWh, the GAHE will produce about 20,000 kWh made available. This results in a heating saving of approx. 2.000€ pa. In the summer the largely constant temperature of the soil can also be used for cooling. Compared to a cooling with a conventional air conditioning system, the GAHE saves approx. € 1,000 pa

Data:

Laying in Tichelmann system
700 m AWADUKT Thermo pipe DN 200
50 m AWADUKT thermo distribution pipe in DN 500
2,700 m3/h air flow rate
20,500 kWh of energy savings in winter
10,700 kWh of energy savings in summer

The aim of the research project is to confirm the actual performance of the ground-air heat exchanger.

The parties involved:
- Poznan University of Technology (Politechnika Poznańska) - Institute for heating systems, air conditioning and environmental protection
- TESCO Engineering division
- REHAU AG + Co (Technical Department)
The testers were provided at the Technical University of Poznan.

After the opening of the supermarket on 06.03.2007, around one month later on 04.04.2007 began a one-year measurement. The results demonstrate the high performance of the GAHE. The measurements were made at outdoor temperatures of up to -2 ° C and reached outlet temperatures of 13 ° C at the end of the GAHE.

To reach a building temperature of +19 ° C, the air must therefore only be heated by 6 degrees. Therefore, the ground-air heat exchanger AWADUKT Thermo reduced the costs for heating energy significantly.

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