Abstract:
The present invention relates to an actuator (3) for regulating a valve (1) in a fluid system, wherein the actuator (3) is adapted to operate according to a characteristic curve (4) containing information correlating a valve opening with a flow through the valve (1) and to a flow rate measured by a flow measuring device (5), characterized in that, the regulation of the valve (1) is based on a modified characteristic curve (4M) that is based on a basic characteristic curve (4B) and the measured flow rate by the flow measuring device (5) compared to a design flow rate. The present invention further relates to the method of controlling the valve.
Abstract:
A method to control a fluid flow regulating device being regulated through a control signal ranging from 0-100% during a normal operational load, defined as being within a given load threshold, where said control signal is 0% when said flow regulating device is to be closed and 100% when it is to be open, but when said load gets outside said load threshold the control enters a modified control where said control signal either is never at 0% and/or is never at 100%. A controller including said control method.
Abstract:
The invention relates to a control system (12) for controlling a control valve (16) of a hydrodynamic system (10) using an actuator (14), the hydrodynamic system (10) comprising a heat exchanger (24) with a water inlet (18), a water outlet (20), an air inlet (26), and an air outlet (28), the control system (12) comprising a water inlet temperature sensor (30) that is configured to determine a water inlet temperature value, a water outlet temperature sensor (32) that is configured to determine a water outlet temperature value, and an air inlet temperature sensor (34) that is configured to determine an air inlet temperature value, wherein the control system (12) is configured to determine an alpha value of a characteristic of the hydrodynamic system (10) from the water inlet temperature value, the water outlet temperature value, and the air inlet temperature value; to set an inverse of the alpha value of the characteristic of the hydrodynamic system (10) as an alpha value of a characteristic of the control valve (16) in combination with the actuator (14); and to control the control valve (16) with the actuator (14) using the set alpha value of the characteristic of the control valve (16) in combination with the actuator (14). The invention provides an improved control system (12) and a method for controlling a control valve (16) of a hydrodynamic system (10) using an actuator (14) having an optimal control performance and energy efficiency.
Abstract:
System introducing the means to control the flow rate and of a heat exchanging fluid medium to a riser in a one-pipe system being a typical pipe set up in for example building cooperatives for supplying heat to the radiators of the flats. The control method being to regulate the temperature of the supplied heat exchanging fluid medium in response to changes in external parameters (temperature) and the flow rate in response to the temperature of the heat exchanging fluid medium in an return line.
Abstract:
Method to control the flow rate and of a heat exchanging fluid medium to a riser in a one-pipe system being a typical pipe set up in for example building cooperatives for supplying heat to the radiators of the flats. The method being to regulate the temperature of the supplied heat exchanging fluid medium in response to changes in external parameters (temperature) and the flow rate in response to the temperature of the heat exchanging fluid medium in a return line.
Abstract:
A residential heat system (1) is described comprising a heat exchanger (2) having a primary side (3) and a secondary side (4), wherein the primary side (3) is connected to a heat source and the secondary side (4) is connected to a heating arrangement, the heating arrangement comprising plural branches (6, 7), each branch (6, 7) having a heat exchanging device (8, 9). Such a residential heating system should minimize heat consumption. To this end a valve arrangement (14) having a flow control valve (16) and a pressure regulating valve (17) keeping constant a pressure difference over the flow control valve (16) is located in a line (15) between the heat exchanger (2) and the branches (6, 7).
Abstract:
Method to control the flow rate and of a heat exchanging fluid medium to a riser in a one-pipe system being a typical pipe set up in for example building cooperatives for supplying heat to the radiators of the flats. The method being to regulate the temperature of the supplied heat exchanging fluid medium in response to changes in external parameters (temperature) and the flow rate in response to the temperature of the heat exchanging fluid medium in an return line.