Abstract:
The invention relates to a method and a system (1 ) for sampling an ultrasonic signal, comprising two ultrasonic transducers (2, 3) arranged in a fluid path connected to a control unit (4). Task of the invention is to provide a method and a system for sampling an ultrasonic signal that allows to obtain a higher resolution digital output signal without the need for an analog-to-digital converter with a high sampling frequency. The task is solved by a method comprising the following steps: a) Sending an input electric signal from the control unit (4) to a first ultrasonic transducer (2), transforming the input electric signal to an ultrasonic signal and sending it to a second ultrasonic transducer (3) through the flow path, b) transforming the received ultrasonic signal at the second ultrasonic transducer (3) to an output electric signal that is sent to the control unit (4), c) sampling the output electric signal received at the control unit to a first series of digital samples at a sampling frequency, d) repeating steps a) to c) at least once with the same electric input electric signal, wherein in step c) the time of start of the sampling measured from the time of start of the respective input electric signal and/or the sampling frequency is different from the previous sampling, e) combining the obtained series of samples to obtain a combined digital output signal.
Abstract:
A method for controlling a fan (6) of a vapour compression system (1) is disclosed, the fan (6) being arranged to provide a secondary fluid flow across a heat rejecting heat exchanger (3). A temperature difference, ΔΤ= T out -T amb , between a temperature, T out , of refrigerant leaving the heat rejecting heat exchanger (3) and a temperature, T amb , of ambient air of the heat rejecting heat exchanger (3) is established. A setpoint value, ΔT setp , for the temperature difference, ΔΤ, is obtained, the setpoint value, ΔT setp , being dependent on the fan speed of the fan (6) in such a manner that the setpoint value, ΔT setp , increases as the fan speed increases. The fan speed of the fan (6) is controlled in order to control the temperature difference, ΔΤ, in accordance with the obtained setpoint value, ΔT setp .
Abstract translation:公开了一种用于控制蒸气压缩系统(1)的风扇(6)的方法,所述风扇(6)被布置成提供穿过排热热交换器(3)的二次流体流动, 。 在离开排热热交换器(3)的制冷剂的温度T out之间的温度差ΔT = T out -T amb, )和排热换热器(3)的环境空气的温度T amb建立。 获得用于温差ΔT的额定值ΔTsetp,其中设定值ΔTsetp取决于风扇6的风扇速度, 以这样的方式,当风扇速度增加时,额定值ΔTsetp sub>增加。 控制风扇(6)的风扇速度以根据所获得的设定值ΔT setp sub>控制温差ΔT。
Abstract:
A method for risk management in a retail distribution chain, in which items are distributed from one or more producers (1) to one or more retail stores (14), via two or more closed compartments (4, 6, 7, 8, 10, 11, 13, 15), said items being transported in collis (2) being packed on pallets (3), is provided. Relationships between collis (2), pallets (3) and closed compartments (4, 6, 7, 8, 10, 11, 13, 15) are registered and provided to a central data storage device. Temperatures prevailing inside the closed compartment (4, 6, 7, 8, 10, 11, 3, 15) are monitored and provided to the central data storage device. Thereby a complete temperature data overview relating to each colli (2) in the entire distribution chain from producer (1) to retail store (14) is provided at the central data storage device. 10
Abstract:
A linear actuator (1) comprising a first part (3) and a second part (5) is disclosed. The first part (3) is arranged to rotate along with a rotating part (4) of a motor (2), and the second part (5) is arranged to drive an actuated part (18, 22). A coupling (6) interconnects the first part (3) and the second part (5) to allow the second part (5) to rotate along with the first part (3) at the same angular velocity as the first part (3). The coupling (6) defines a fit tolerance between the first part (3) and the second part (5) allowing the first part (3) to rotate a predefined distance before engaging the second part (5) and rotating the second part (5) along with the first part (3). The fit tolerance ensures that the first part (3) reaches a certain angular velocity and thereby that the resulting torque transfer from the first part (3) to the second part (5) is sufficient, e.g. to release the actuated part (18, 22) from a pretensioned state.
Abstract:
A method for controlling a vapour compression system (1) is disclosed, the vapour compression system (1) comprising at least one expansion device (8) and at least one evaporator (9). For each expansion device (8), an opening degree of the expansion device (8) is obtained, and a representative opening degree, OD rep , is identified based on the obtained opening degree(s) of the expansion device(s) (8). The representative opening degree could be a maximum opening degree, OD max , being the largest among the obtained opening degrees. The representative opening degree, OD rep , is compared to a predefined target opening degree, OD target , and a minimum setpoint value, SP rec , for a pressure prevailing inside a receiver (7), is calculated or adjusted, based on the comparison. The vapour compression system (1) is controlled to obtain a pressure inside the receiver (7) which is equal to or higher than the calculated or adjusted minimum setpoint value, SP rec .
Abstract:
The present invention relates to a method for transferring information between an utility meter (3) and an electronic consumer communication device (2) via an electronic data transfer device (4) of the utility meter (3). Furthermore, the invention relates to an app adapted to provide such a method when running on the electronic consumer communication device (2). Additionally, this invention relates to the electronic consumer communication device (2) adapted to transfer information between the utility meter (3) and the electronic consumer communication device (2) via the electronic data transfer device (4) of the utility meter (3), the electronic consumer communication device (2) comprising and being adapted to run the app. Such a method may simplify installation and maintenance of utility meters (3) and may furthermore reduce installation costs.
Abstract:
The present invention relates to a reflector arrangement (9) for installation in an ultrasonic flow sensor (11), the reflector arrangement (9) comprising two or more holder elements (1, 1') attached to each other, the holder elements (1, 1') together giving the reflector arrangement (9) a basically cylindrical outer shape, the holder elements (1, 1') providing one or more reflector seatings (2, 2') in order to secure one or more reflectors (3, 3'). Furthermore the invention relates to a method for producing a holder element (1, 1') as a part for a reflector arrangement (9) for installation in an ultrasonic flow sensor (11), the holder element (1, 1') comprising an elongated cylindrical outer wall structure (7, 7') for forming the basically cylindrical outer shape of the reflector arrangement (9). Installing the reflector (3, 3') on the reflector seating (2, 2') of the holder element (1, 1') occurs during a molding process of the holder element (1, 1'). This allows easy and stable mounting of the reflector (3, 3') in the reflector arrangement (9).
Abstract:
A controller for a refrigeration system or air-conditioning system. The controller comprises a user interface with a digital visual output unit (4) and a touch sensing area (5). To enable easy operation even at places being difficult to access, e.g. at floor panels of refrigeration furnitures etc., the digital visual output unit is incorporated into a first portion of a front surface (3) on the housing (2), and the touch sensing area is incorporated into a second portion of the front surface, the first portion being distinct from the second portion, the touch sensing area (5) being in the form of an inductive sensor or a capacitive sensor.
Abstract:
The present invention relates to a transceiver circuit for a flow meter comprising a common signal path for signals to be transmitted and/or received via one or more associated transducers, the transceiver circuit comprising a generator circuit, a signal processing circuit and an active circuit, wherein the active circuit comprises a first and a second transistor being operatively connected via their respective emitter terminals thereby forming a combined input/output terminal, said combined input/output terminal being operatively connectable to one or more associated transducers, the active circuit being adapted to act as a buffer for signals to be transmitted, and adapted to act as an amplifier for received signals.
Abstract:
A heat exchanger valve arrangement has a pressure control valve (17), said pressure control valve (17) comprising a valve element (18) cooperating with a throttling element (19) and controlling a differential pressure (P2-P3). The invention provides means with which pumping energy in a heating system can be kept low. To this end detecting means (28, 29) are provided detecting whether said differential pressure (P2-P3) exceeds a predetermined minimum value.