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Completion: |
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1997 |
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Heat pump condenser capacity: |
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270 kW |
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Floor space: |
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21,500 m2 |
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Annual heating output of heat pump: |
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700,000 kWh |
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Client: |
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Pensionsversicherungsanstalt der Arbeiter, Vienna - A |
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Architect: |
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Werner Nussbaumer, Vienna - A |
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Building services consultant: |
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J.L. Bacon Ges.m.b.H., Linz - A |
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enercret installation: |
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Retaining wall: |
cm169 cast-in-situ piles, DN 120 cm |
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Absorber piles: |
143 cast-in-situ piles, DN 120 cm, total length 2040 m |
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HDPE piping: |
approx. 40,000 linear metres, 25mm O.D. |
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Heat pump condenser capacity: |
270 kW |
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Before the concrete was poured for the bored cast-in-situ piles, the reinforcing cages were fitted out with polyethylene piping. The piles thus act as heat exchangers as well as fulfilling their normal structural function. Out of a total of 169 bored piles, 143 are used as heat exchangers.
The HDPE piping has an outside diameter of 25mm, a wall thickness of 2.3mm and a nominal pressure of 10 bar. Each individual bored pile houses some 160 m - 210 m of piping which is connected to a header duct by means of flow and return lines. The infeed lines are laid behind the retaining wall and/or underneath the ground slab. The two header ducts were installed in a pit behind the retaining wall where they can be accessed. Each absorber pile can be individually regulated or shut off at these headers. |
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