One-family Houses

  • 700_350_HP_comtemporary_cost_effective_heat_pump
  • One-family house application includes domestic hot water (DHW) and heating applications connected to a district heating network with a supply temperature of 90°C and pressure level of PN16. The supply temperature normally range from 55°C to 90°C and the designed pressure level can be PN10 or PN16.

    A one-family substation is a subscription interface to the district heating network. The substation will acquire the heat required from the district heating network, either by direct flow into the building heating system or by extracting the demanded heat, no more ad no less, from the district heating network by means of a heat exchanger. The substation will adjust the temperatures of the water flow in the building heating installation according to the need of the building using the control valves.

    The one-family house substations can firstly be categorised according to their space heating connection and secondly the DHW preparation method. The space heating connection can be either direct or indirect. Were in the direct connection the district heating water flows through the space heating installation and in the indirect connection the district heating water is separated from the space heating installation water by a heat exchanger. Further, on the direct connection can be divided into two methods, uncontrolled and a mixing loop application.

    There are generally three DHW applications available:

    1. Instantaneous DHW
    2. DHW storage charging tank
    3. DHW cylinder with internal heating coil 
     
    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 DH water is minimized, as well as the risk and consequences of leakage. 
       

    3. Directly connected room heating with a mixing loop application
      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

      Generally a one-family substation has both DHW and room heating applications, which can be described as:
       
    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 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 DH water is increased, as well as the risk of leakage 

     

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