Abstract: A system is provided for generation of a set point for a control or automatic feed back control of the feed line temperature in a heating plant depending on the outside temperature. Usually such set points are entered as heating curves into the controller. The heating curves are in reality nonlinear relationships and are difficult to be processed by a computer. The invention subdivides the heating curve into two straight lines, which meet at a common point. This point is placed where the maximum difference occurs between the heating curve and a linear relationship connecting points corresponding to a minimum permissible lowest temperature and to a sufficient high outside where no heating energy is required. Operation according to the invention saves energy by better approximating the temperature requirements of inside rooms at different outside temperatures and this increases the comfort of the persons staying there.

Abstract: A radial blower is provided with a spiral shape casing, which has an input port for the medium to be moved and an output port for the medium to be delivered. The input port is disposed on the side of the casing in the direction of a spiral axis and where the center of the input port is displaced relative to the center of the spiral. The output port connects the start of the spiral section to the end of the spiral section and forms a connection piece. The output port according to the invention increases in its cross-section continuously while going from the connection point of the spiral to the outer end. Preferably a protruding nose is placed at the junction point of the output port and of the smaller radius side of the spiral for enhancing the pushing power of the fan blades versus the medium and for reducing the flow resistance of the output port to the medium stream.

Abstract: A sorption heat pump including a fuel energized discharge unit from which heated fluid media for the heat pump is provided and a circuit having the fluid media circulated therethrough and arranged to include a heat exchanger, an absorber, pump devices, a temperature level changer and an energy consumption circuit. The discharge unit operates to emit the fluid media into the circuit as a heated weak solution and to receive the fluid media returned from the circuit as a rich solution. The discharge unit also produces an overheated vapor. The temperature level changer comprises a first and a second heat exchange unit, with the first unit being directly connected to the discharge unit to receive the weak solution therefrom, with the first unit also being connected to form part of a supply line for the energy consumption circuit.