Abstract: A control valve having a closing element, mounted in a housing between an inlet side and an outlet side and rotatable about an axis between a first and second end positions, and a passage channel through the closing element perpendicularly with respect to the rotational axis. The channel has inlet and outlet openings and connects the inlet side to the outlet side in the first end position, disconnects the inlet side from the outlet side in the second end position, and permits an increasing throughflow of a medium during the transition from the second end position into the first end position with a characteristic curve. Low valve noise is achieved because of the shape, size and configuration of the inlet and outlet openings of the passage channel and the configuration of walls of the passage channel without steps and edges.

Abstract: The invention relates to a pressure equalising insert (1) which is provided for installation in a valve (10) for regulating a fluid stream in particular in a HVAC system. The pressure equalising insert (1) comprises a housing (2) having an actuating member (3) which is movably mounted thereon and is configured to at least partially guide the fluid stream regulated by the valve (10) and, when the pressure equalising insert (1) is installed, co-operates with a valve seat (15) depending upon a pressure difference prevailing in the fluid stream in order to regulate the fluid stream. The invention further relates to a valve (10) having an installed pressure equalising insert (1), wherein the pressure equalising insert (1) can be inserted in particular as a pre-assembled assembly into the valve (10).

Abstract: A drive apparatus (1) for a fire damper (2) having an electric drive (10), which holds the fire damper in a normal position when power is supplied and moves it into a safety position when no power is supplied. A thermal contact breaker (12) interrupts the power supply to the drive (10) at a melt temperature. The drive apparatus (1) also has a temperature sensor (13) for measuring the air temperature (T), a gas sensor (14) for measuring the content (G) of fumes in the air, and a switch module (15), which interrupts the power supply depending on the values of T and G. In the event of a fire, the fire damper can thus be moved into a safety position not only when the temperature in the region of the thermal contact breaker (12) is high, but already when smoke or gas develops as a result of the fire.

Abstract: For controlling the opening of a valve (10) in an HVAC system (100) to regulate the flow ? 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 ? through a valve (10) and the temperature difference ?T=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 ? and the temperature difference ?T. For example, the opening of the valve (10) is controlled depending on a control criterion c=f(?,?T), calculated from the flow ? and the temperature difference ?T.

Abstract: The invention relates to a control apparatus (3) for an HVAC system (5), wherein the control apparatus (3) has a communication module (33) for communicating with one or more components of the HVAC system (5). The control apparatus comprises a passive NFC transponder (34), which is set up to receive and store a unique identifier (341) of each of the one or more components from a mobile service apparatus (2) before a power supply for the control apparatus (3) is switched on, and a control module (35) which is set up to access stored identifiers (341) after a power supply for the control apparatus (3) has been switched on and to transmit control signals to components determined by the identifiers via the communication module (33). The invention also relates to a mobile service apparatus (2) and to components in the form of drives (1), sensor apparatuses, regulators, operating devices and/or communication devices of the HVAC system (5).

Abstract: To balance (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 is stored (S2) which determines a valve position of the relevant control valve for target flows through one of the consumers in each case. A current total flow through the group of consumers is determined by means of a common flow sensor (S32) and a balance factor (S34) is defined on the basis of the current total flow and a sum of the desired target flows through the consumers. The consumers are dynamically balanced by setting (S31) the valve settings for the corresponding control valves on the basis of the characteristic data and the balance factor.

Abstract: This device has a drive output element for the actuation of a rotatable body which is separate or separable from the device, and it has a housing part in which the drive output element is rotatably mounted. The drive output element has a coupling part which is designed for rotational positive locking and which is designed to be mounted on a corresponding coupling connector of the shaft of the rotatable body. The device is characterized in that a quick-action fastener arrangement is provided for the detachable connection of the coupling part to the coupling connector. Further, the quick-action fastener arrangement can have manually actuable elements for enabling the quick-action fastener arrangement to be closed without tools.

Abstract: The present disclosure is directed towards a method of controlling opening of a valve (10) in an HVAC system (100). The method includes controlling the opening of the valve (10) according to a default control mode in dependence of a default sensor signal. The method further includes determining, while controlling the opening of the valve (10) according to the default control mode, whether the default sensor signal is faulty and switching, in case of the default sensor signal being faulty, to controlling the opening of the valve (10) according to a fallback control mode, with the opening of the valve (10) being controlled independently of the faulty sensor signal in the fallback control mode. The present invention is further directed towards a corresponding control device opening of a valve (10) in an HVAC system as well as a corresponding computer program product.

Abstract: The invention relates to a method for operating a heat exchanger (15). On a primary side, a heat transfer medium flows through the heat exchanger (15), which heat transfer medium enters the heat exchanger (15) with a first temperature (TWein) and exits the heat exchanger (15) with a second temperature (TWaus). On a secondary side, the heat exchanger emits a heat flow (Q) to a secondary medium flowing through the heat exchanger (15) in the case of heating or in the case of cooling absorbs a heat flow (Q) from the secondary medium, which enters the heat exchanger (15) with a third temperature (TLein) and exits the heat exchanger (15) again with a fourth temperature (TLaus), wherein the heat exchanger (15) is capable of transferring a maximum heat flow.

Abstract: The invention relates to a brushless direct-current motor (1), comprising a stator (2), a rotor cup (30) that revolves around the stator (2) and has a plurality of permanent-magnet poles (N, S), and a detent torque plate (4) that is connected to the stator (2) and has several pole shoes (41) for generating a detent torque that brings the revolving rotor cup (30) into a detent position. The pole shoes (41) are each arranged in the detent position between two adjacent poles (N, S) of the revolving rotor cup (30) to form a magnetic short circuit. The detent torque plate (4) is arranged substantially outside of the magnetic rotating field produced by the stator (2) during operation, whereby the production of the detent torque is decoupled from the electrical behavior of the brushless direct-current motor (1) and the power of the brushless direct-current motor (1) is not substantially influenced by the presence of the detent torque plate (4).

Abstract: 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 (?) through a supply line (14) into the energy consumer (11, 12, 13) at a supply temperature (Tv) and leaving the energy consumer (11, 12, 13) at a return temperature (TR) 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 (?T) between supply temperature (Tv) and return temperature (TR) on the volume flow (?) 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.

Abstract: A flow characterizing device (30) for a valve comprises: a body (31) in form of a disc with a centerline, the body (31) having an inner surface (33) corresponding to the outer surface of the valve member when the flow characterizing device (30) is installed in the flow path of the valve; and an outer surface (37), the inner and outer surfaces (33, 37) of the flow characterizing device (30) disposed in a spaced relationship along the centerline of the flow characterizing device (30). The body (31) of the flow characterizing device (30) further comprises a flow characterizing channel (49) therein extending between the inner surface (33) and the outer surface (37) of the flow characterizing device (30), thereby providing fluid communication between the inner and outer surfaces (33, 37) of the flow characterizing device (30), and defining an opening (32) in the inner surface (33) of the flow characterizing device (30).

Abstract: A control unit (22) for an HVAC system (10) comprises an economizer (EC), which economizer (EC) is configured to introduce outdoor air (OA) into the HVAC system (10) for cooling and/or ventilation purposes in a manner controlled by said control unit (22), said control unit (22) comprising a base module (23) with: a control circuit (24), a man machine interface (25) connected to said control circuit (24), and first I/O means for connecting at least one sensor (32, . . . , 36) of said HVAC system to said control circuit (24) and for delivering at least one control signal from said control circuit (24) to control the operation of said economizer (EC). Said base module (23) is configured to optionally receive at least one extension module (26, 27, 28), which can be snapped on and electrically connected to said base module (23) for expanding the functionality of said control unit (22).

Abstract: An actuator (1) comprises an electrical motor (10) for driving a damper (3) from a rest position to a stalled position. The damper (3) is biased toward the rest position with at least one spring. A control module (2) is configured to supply, upon activation of the actuator (1), a drive current to the electrical motor (10) for driving the damper (3) from the rest position to the stalled position against a bias force produced by the spring. The control module (2) is further configured to reduce the drive current to a lower level for maintaining the damper (3) in the stalled position when a defined duration of time has elapsed since activation of the actuator (1). Damages to the electrical motor (10) and/or gear trains can be avoided without having to provide any circuitry or sensory equipment for measuring the drive current.

Abstract: For the purpose of balancing (S3) a group of consumers in a fluid transport system in which each consumer is configured with a motorized regulating valve for the purpose of regulating the flow through the consumer, characteristic data for the consumer is saved (S2) which determines a valve position of the corresponding regulating valve for the target throughput through each consumer. A momentary total throughput through the group of consumers is determined (S32) by means of a common throughput sensor, and based on the momentary total throughput and a sum of the desired target throughputs through the consumers, a balancing factor is determined (S34). By setting (S31) the valve positions of the corresponding regulating valves based on the characteristic data and the balancing factor, a dynamic balancing of the consumers is carried out.

Abstract: For controlling the opening of a valve (10) in an HVAC system (100) to regulate the flow ? 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), an energy-per-flow gradient (A) is determined, and the opening of the valve (10) is controlled depending on the energy-per-flow gradient (A). The energy-per-flow gradient (A) is determined by measuring at consecutive points in time the flow ?1, ?2 through the valve (10), by determining the amounts of energy E1, E2 exchanged by the thermal energy exchanger (2) at these points in time, and by calculating the energy-per-flow gradient (B) from the flow ?1, ?2 and exchanged energy E1, E2. The energy-per-flow gradient (A) can be determined dynamically and is used as a basis for setting a slope threshold for the thermal energy exchanger (2) so that there is no need to store fixed threshold values.

Abstract: The invention is based on an HVAC (heating, ventilation and air-conditioning) system which comprises the following components: a) a fluid flow duct (1), b) a fluid flow valve (7) which is arranged therein and has a valve body (5) in the fluid flow duct (1) and a valve motor (15) which moves the valve body (5), c) a control circuit for activating the valve motor, d) a sensor (8) in the fluid flow duct (1) and e) an evaluation module for evaluating signals of the sensor. In order to produce an automated functional control, the following procedure is adopted: f) a first actuation signal is preset for the valve motor by the control circuit, and the actuation signal corresponds to a first setpoint position of the valve body (5), g) registration of a first signal of the sensor (8) by the evaluation module, and h) determination of a functional diagnosis of the fluid flow valve on the basis of the first signal of the sensor.

Abstract: An actuator (1M, 1S) with a motor (12) and a motor controller (11) is configurable to operate as a master or a slave to another actuator which is coupled mechanically for driving a common load. For the case where the actuator (1M) is set as the master, the motor controller (11) receives on an input terminal (Y3) an external position control signal (pC), generates a motor control signal (sC) for controlling the motor (12) based on the position control signal (pC), and supplies the motor control signal (sC) to an output terminal (U5) for controlling a slave. For the case where the actuator (1S) is set as the slave, the motor controller (11) controls the motor (12) by supplying to the motor (12) the motor control signal (sC) received from the master. Controlling the actuators with a master improves workload balancing and reduces damages to transmission mechanics of the actuators.

Abstract: 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).