摘要:
For controlling the opening of a valve (10) in an HVAC system (100) to regulate the flow φ of a fluid through a thermal energy exchanger (2) of the HVAC system (100) and adjust the amount of energy E exchanged by the thermal energy exchanger (2), determined are the flow φ through a valve (10) and the temperature difference ΔT=Tin−Tout between the supply temperature Tin of the fluid entering the thermal energy exchanger (2) and the return temperature Tout of the fluid exiting the thermal energy exchanger (2). The opening of the valve (10) is controlled depending on the flow φ and the temperature difference ΔT. For example, the opening of the valve (10) is controlled depending on a control criterion c=ƒ(φ,ΔT), calculated from the flow φ and the temperature difference ΔT.
摘要:
Ein DC-Motor (46) betätigt ein stark untersetztes Reduktionsgetriebe eines Stellantriebs für eine Klappe oder für ein Ventil zur Regelung eines Gas- oder Flüssigkeitsvolumenstroms, insbesondere auf dem Gebiet Heizung-Lüftung-Klima (HLK), Brand- und Raumschutz. Der elektrische Stromfluss in die Statorspulen (A, B, C) wird ohne eingebaute Positionssensoren programmgesteuert kommutiert. Die Umdrehungen des Rotors (54) des DC-Motors (46) können auch mit speziellen Algorithmen gezählt werden, wobei prinzipbedingte Probleme bei Motordrehzahlen von weniger als etwa 200 rpm vermieden werden. Der DC-Motor (46) umfasst einen Stator (44) mit drei Statorspulen (A, B, C), welche sich über 3n Statorpole (52) erstrecken, und einen ringförmigen Dauermagnet-Rotor (54) mit 2m Dauer-magnetsegmenten alternierender Polarität (N, S), einem coaxialen becherförmigen Aussenläufer (110) und einer coaxialen Antriebswelle (108), wobei n und m ganzzahlige, voneinander unabhängige Multiplikationsfaktoren 1, 2, 3, 4.... sind. Der Stellantrieb (112) umfasst vorzugsweise eine Feder (120) zum automatischen Rückstellen bei einem Stromunterbruch.
摘要:
The invention relates to a method for operating and/or monitoring an HVAC system (10), in which a medium circulating in a primary circuit (26) flows through at least one energy consumer (11, 12, 13), the medium entering with a volume flow (φ) through a supply line (14) into the energy consumer (11, 12, 13) at a supply temperature (T v ) and leaving the energy consumer (11, 12, 13) at a return temperature (T R ) via a return line (15), and transferring heat or cooling energy to the energy consumer (11, 12, 13) in an energy flow (E). A considerable improvement in the operating behavior of the system is achieved by empirically determining the dependence of the energy flow (E) and/or the temperature difference (ΔΤ) between supply temperature (T v ) and return temperature (T R ) on the volume flow (φ) for the energy consumers (11, 12, 13) in a first step, and by operating and/or monitoring the HVAC system (10) according to the determined dependency or dependencies in a second step.
摘要:
In order to equalize (S3) a group of consumers in a fluid transport system, in which each consumer is provided with a motorized control valve for regulating the flow through the consumer, characteristic data for the consumers are stored (S2), which determine a respective valve position of the corresponding control valve for the target flows through each of the consumers. A current total flow through the group of consumers is determined (S32) by means of a common flow sensor, and an equalization factor is determined (S34) on the basis of the current total flow and a sum of the desired target flows. A dynamic equalization of the consumers is carried out by setting (S31) the valve positions of the corresponding control valves on the basis of the characteristic data and the equalization factor.
摘要:
The invention relates to a method for determining the heat flow (dQ/dt) emanating from a heat transporting fluid (12), which is a mixture of at least two different fluids, and which flows through a flow space (11) from a first position, where it has a first temperature (T1), to a second position, where it has, due to that heat flow (dQ/dt), a second temperature (T2), which is lower than said first temperature (T1), whereby the density and specific heat of said heat transporting fluid (12) is determined by measuring the speed of sound (vs) in said fluid, and said density and specific heat of said heat transporting fluid (12) is used to determine the heat flow (dQ/dt).