Abstract:
A thermostat device (1) is described comprising a housing (2) having a longitudinal axis (3), a bellows (5) arranged in said housing (2), an actuator arrangement (7) moveable in a direction parallel to said longitudinal axis (3), loaded by a force produced by said bellows (5) in a first direction and by a force of a spring arrangement (13, 15) in a second direction opposite to a first direction and comprising a first element (8) and a second element (9). Such linear thermostat should be of simple construction. To this end said spring arrangement (13, 15) comprises first spring (13) holding said first element (8) and said second element (9) together to move said first element (8) and said second element (9) like a one piece part until said second element (9) comes to rest against a stop (27).
Abstract:
A centrifugal compressor according to an exemplary aspect of the present disclosure includes, among other things, an impeller provided in a main flow path and configured to pressurize a main flow of fluid. The compressor also includes a secondary flow path configured to provide a secondary flow by recirculating a portion of the main flow. The amount of the main flow that becomes the secondary flow is less than or equal to 15%. A method is also disclosed.
Abstract:
Heat exchangers in general, but mere specifically cupper, Cu, brazed plate type heat exchangers formed of a plural of surface structured stacked plates brazed together by copper, show severe problems with corrosion in some regions of the world. The present invention relate to forming a protection of the plates in order to reduce the observed corrosion problems.
Abstract:
The invention relates to an axial valve (1, 41, 59, 74) comprising a housing (2), an inlet (3), an outlet (4), a main valve (9, 75) and a pilot valve (18, 42, 61, 76). The opening and closing of the main valve (9, 75) is controlled by actuating the pilot valve (18, 42, 61, 76). The pilot valve (18, 42, 61, 76), comprises a pilot valve element (19, 46, 66, 77) and an armature (24, 83). The main valve (9, 75) comprises a main closing element (10, 52, 64). The object of the invention is to provide an axial valve with a cheaper and less complicated construction. To this end, the pilot valve element (19, 46, 66, 77) is arranged displaceable inside the armature (24, 83) and the armature's relative position to the main closing element (10, 52, 64) is fixed.
Abstract:
A valve (9) for use in a vapour compression system (1) is disclosed. The valve (9) comprises a first inlet (13) arranged to be connected to a gaseous outlet (11) of a receiver (6), a second inlet (14) arranged to be connected to an outlet of an evaporator (8), a first outlet (15) arranged to be connected to an inlet of a compressor unit (2), a non-return valve arrangement (19) arranged to allow a fluid flow from the second inlet (14) towards the first outlet (15), but to prevent a fluid flow from the first outlet (15) towards the second inlet (14), and a control valve mechanism (20) arranged to control a fluid flow from the first inlet (13) towards the first outlet (15).
Abstract:
The present invention relates to a top cover (3) for a soft throttling valve body (2), to a soft throttling valve (1), and to a method for throttling a main valve of a soft throttling valve (1). A follower arrangement (8) is arranged to throttle a pilot fluid flow for setting a degree of opening of the main valve in order to allow a soft throttling of the main valve, a throttling of the pilot fluid flow depending on a degree of opening of the main valve, so as to allow for a soft throttling process of the main valve. Thus, a self-controlled throttling of pilot fluid flow driving the main valve in order to establish a partial opening of the main valve becomes possible. By that, a good prevention of pressure shocks when throttling the valve is allowed and a good control for partially opening the main valve is achieved.
Abstract:
A method for controlling an air handling unit (1) comprising an ingoing duct (3), an outgoing duct (4), a controlled space (2), at least one heating coil (10) and/or at least one cooling coil (11), and a mixing damper arrangement (6) and/or an enthalpy wheel (5). An intermediate temperature value (T mixer ) in the ingoing duct (3) at a position (12, 13) upstream relative to the heating coil(s) (10) and/or cooling coil(s) (11), and downstream relative to the mixing damper arrangement (6) and/or the enthalpy wheel (5) is measured, and the mixing damper arrangement (6) and/or the enthalpy wheel (5) is/are controlled in accordance with an intermediate temperature setpoint value, and in order to obtain an intermediate temperature value (T mixer ) which is equal to the intermediate temperature setpoint value. A stable control of the air handling unit (1) is obtained.
Abstract:
The present invention relates to a transceiver circuit for a flow meter comprising a common signal path for signals to be transmitted and received, the transceiver circuit comprising a generator circuit, a signal processing circuit and a transimpedance amplifier, wherein the transimpedance amplifier comprises a combined input/output terminal being operatively connectable to one or more associated transducers, and wherein the transimpedance amplifier provides a separate transmitting impedance ZTx between an input terminal and the combined input/output terminal, and a separate receiving impedance ZRx between the combined input/output terminal and an output terminal.
Abstract:
A level sensor is configured to provide a receiver level indicating an amount of the refrigerant present in the receiver and a level model provides a heat rejecting heat exchanger estimate indicating an amount of the refrigerant present in the heat rejecting heat exchanger based on a temperature of the refrigerant. From the sensor and the model, a loss of refrigerant from the RVCS system is estimated.
Abstract:
A method for controlling a variable capacity ejector unit (7) arranged in a refrigeration system (1) is disclosed. An ejector control signal for the ejector unit (7) is generated, based on an obtained temperature and an obtained pressure of refrigerant leaving a heat rejecting heat exchanger (3), or on the basis of a high pressure valve control signal for controlling an opening degree of a high pressure valve (6) arranged fluidly in parallel with the ejector unit (7). The ejector control signal indicates whether the capacity of the ejector unit (7) should be increased, decreased or maintained. The capacity of the ejector unit (7) is controlled in accordance with the generated ejector control signal. The power consumption of the refrigeration system (1) is reduced, while the pressure of the refrigerant leaving the heat rejecting heat exchanger (3) is maintained at an acceptable level.