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  • 1.
    Holmberg, Sture
    et al.
    KTH, Superseded Departments (pre-2005), KTH Syd.
    Molin, Fredrik
    KTH, Superseded Departments (pre-2005), KTH Syd.
    Myhren, Jonn
    KTH, Superseded Departments (pre-2005), KTH Syd.
    Space heating at low temperature difference between heating unit and ambient air2004In: Proceedings of the 9th International Conference on Air Distribution in Rooms, Coimbra, Portugal 5 - 8 Sept., 2004, 2004Conference paper (Refereed)
    Abstract [en]

    Rising energy prices have contributed to the development of heat pump-based heating systems in Sweden. Low flow temperature in the secondary heat distribution system to rooms is a requirement for energy-efficient systems. This increases the thermal efficiency of the heat pump and decreases thermal losses in the distribution system. Flow temperatures in water-based systems for heat distribution in buildings have been decreased from 55°C to temperatures around 30°C. This is to maximize the efficiency of heating systems that are based on heat pump technology. Different technical solutions have been suggested to guarantee space-heating requirements with low temperature difference between heating units and ambient air. Floor heating has in many cases been considered a good option, and the popularity of such systems has dramatically increased. Complicated installation work, moisture problems and slow thermal control with floor heating are reasons enough to find alternative low-temperature units for heat distribution in rooms. This may result in a combined heating and ventilation system that operates with forced convection.

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