Multi-family Buildings with Central System

  • Residential buildings with multiple family homes
  • In multi-family houses, it is typical to have a district heating substation in the basement supplying the flats with hot water for both room heating and DHW purposes.

    There are different application types that are for multi-family building with a central system which are: Instantaneous DHW application, indirectly connected room heating application, directly connected room heating with mixing loop, indirectly connected room heating and instantaneous domestic hot water application, directly connected room heating with mixing loop and domestic hot water instantaneous application and indirectly connected two-step HE and instantaneous DHW application.

    Of the above Danfoss recommends to use the following application types:

    Application Types  

    1. Instantaneous DHW preparation
      DHW is instantaneously prepared with a heat exchanger, the heat exchanger physically separates the DHW and DH water. The application can for an extended period of time supply a continuous amount of hot water at a constant temperature 
       
    2. Indirectly connected room heating application
      The heat exchanger physically separates the DH network and the HE circuit and is typically electronically controlled. The risk of contamination of the DH water is minimized, as well as the risk and consequences of leakage
        
    3. Directly connected room heating application with mixing loop
      The supply temperature to the room heating installation is optimized according to the building heat demand by mixing the district heating supply and return water from the room heating installation. As this is a directly connected application the risk of contaminations originating from the room heating installation is high, additionally the risk and consequences of leakages are potentially higher than in a indirectly connected application
       
      These basic applications are then combined in the substation to provide both DHW and room heating: indirectly connected room heating and instantaneous domestic hot water application, directly connected room heating with mixing loop and domestic hot water instantaneous application and indirectly connected two-step HE and instantaneous DHW application.
       
    4. Indirectly connected room heating and instantaneous domestic hot water application
      The heat exchanger physically separates the DH network from the HE circuit. The application can supply an unlimited amount of hot water at a constant temperature and is typically controlled by an electronic weather compensator. The risk of contamination of the DH water is minimized, as well as the risk an consequences of leakage
         
    5. Directly connected room heating with mixed loop and domestic hot water instantaneous application
      The HE system is directly connected to the DH network with a mixing loop. The application can for an extended period of time supply a continuous amount of hot water at a constant temperature and is typically controlled by an electronic weather compensator. The risk of contamination of the DH water is increased, as well as the risk of leakage 
       
    6. Indirectly connected two-step HE and instantaneous DHW application
      In case the return temperature from the room heating installation is high, it can potentially be beneficial to apply two-step heating of the DHW. In the first step the DHW is preheated by the return water from the room heating and then in the second step the DHW is fully heated by the district heating supply. The heat exchanger physically separates the DH network and the HE circuit. Two-step systems are only beneficial during winter time. The risk of contamination of the DH water is minimized, as well as the risk and consequences of leakage

     

  •  Average 3 out of 5

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