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Building solutions for low temperature heat supply.

Resenja zgrada za snabdevanje niskotemperaturne toplote.

Author(s) : GUDMUNDSSON O., THORSEN J. E., BRAND M.

Summary

When utilizing low-temperature district heating it becomes important to achieve good control at the consumer side to meet the required cooling of the sup-ply. The low supply temperature as such is not a big concern for thermostatic radiator controls. When it comes to the domestic hot water the low supply temperature can cause challenges when it comes to Legionella growth. It is therefore important to apply domestic hot water preparation units that can prepare the hot water with minimized risk of Legionella growth. The best way to avoid Legionella is to limit the volume and the time that the domestic hot water is kept at Legionella growth temperatures at any given time. For single family buildings this can easily be done by right setup of the consumer heating interface and ensuring that the distance between the consumer interface and the point of usage is as small as possible and has less than 3 liters of water volume. When it comes to multifamily buildings it becomes a bit trickier as from historical reason the domestic hot water typically is prepared centrally and then circulated around the building. The temperature of the circulation is then controlled to keep a minimum of 50-55°C, to prevent Legionella growth. This way of domestic hot water preparation puts a limit on how low supply temperature can be used by the district heating scheme or alternatively by other decentralized heat sources. To be able to reduce the supply temperature as much as possible it becomes a necessity to move the domestic hot water preparation in multifamily buildings as close to the point of use as possible. This can be achieved by applying flat stations at each flat. The domestic hot water preparation is then moved from the basement to the flat station at each flat.

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Format PDF

Pages: 8 p.

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Details

  • Original title: Resenja zgrada za snabdevanje niskotemperaturne toplote.
  • Record ID : 30020195
  • Languages: English
  • Source: 47th International HVAC&R Congress and Exhibition.
  • Publication date: 2016/12

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