Method and system for determining a gas or liquid content of a fluid and for operating a temperature control circuit based on the determined content

Abstract

According to a method for operating a temperature control circuit which has at least one compressor (1.1 - 1.3), a supply line (8) for supplying temperature control medium to the compressor and at least one sensor (6) for determining a gas or liquid proportion of the temperature control medium flowing in a supply line, the compressor and / or at least one further component of the temperature control circuit is controlled on the basis of the determined proportion during operation of the temperature control circuit.According to a method for determining a gas or liquid portion of a fluid present in a line (8) as wet steam, vibrations are detected using at least one acceleration sensor and / or a speed of sound or a disturbance in a sound signal is detected using at least one ultrasonic sensor and / or a measured variable of heat emission from a heating element is detected using at least one sensor and / or a measured variable of electrical capacitance is detected using at least one sensor, and the portion is determined therefrom (in each case). The invention also relates to a corresponding use, arrangement, temperature control circuit, control system or motor vehicle.

Description

The present invention relates to a temperature control circuit which has at least one compressor, a motor vehicle which has the temperature control circuit, a method for operating the temperature control circuit, a controller for controlling the compressor and / or at least one further component of the temperature control circuit, and a method and an arrangement for determining a gas or liquid fraction of a fluid flowing in a line, preferably as wet steam, with the aid of at least one sensor and a corresponding use of the sensor.From in-house practice, it is known to record pressure p and temperature T of a temperature control agent upstream of the compressor in a temperature control circuit which has a compressor, and to control the temperature control circuit based thereon, preferably in such a way that the temperature control agent supplied to the compressor is as completely gaseous as possible. For this purpose, the temperature control medium is superheated on the basis of the detected pressure and the detected temperature. The thermodynamic state of the temperature control medium can be determined unambiguously in the p-H diagram by the superheating and the temperature control circuit can be controlled accordingly.An object of an embodiment of the present invention is to improve a temperature control circuit or a motor vehicle which has the temperature control circuit or an operation of the temperature control circuit. An object of an embodiment of the present invention is to determine a gas or liquid fraction of a fluid flowing in a line, preferably as wet vapor.At least one of these objects is achieved by a method having the features of claims 1 and 8, respectively. Claims 9-13 protect a use of a sensor described here for carrying out a method described here, an arrangement with at least one sensor described here for carrying out a method described here, a temperature control circuit and a controller for carrying out a method described here or a motor vehicle with a temperature control circuit described here. The dependent claims relate to advantageous refinements.According to one aspect of the present invention, a temperature control circuit, in a particularly advantageous application a temperature control circuit of a motor vehicle, in particular of a passenger car, has at least one compressor, in one embodiment a compressor which during operation of the temperature control circuit compresses at least temporarily temperature control medium or is configured or used for this purpose; a single- or multi-channel feed line through which during operation of the temperature control circuit at least temporarily temperature control medium is fed into the compressor or is configured or used for this purpose; and at least one sensor with the aid of which during operation of the temperature control circuit at least temporarily a gas or vapor or liquid content, in particular a vapor or liquid content, of the temperature control medium(s) which flows in the feed line is determined or is configured or used for this purpose.In a particularly preferred embodiment, the temperature control medium in the feed line flows at least temporarily as wet steam during operation of the temperature control circuit or, with the aid of the at least one sensor, a gas or steam or liquid content, in particular a steam or liquid content, of temperature control medium flowing as wet steam or of wet-steam temperature control medium is determined at least temporarily during operation of the temperature control circuit. In other words, during operation of the temperature control circuit, a gas or vapor or liquid content in the wet vapor (region) is determined at least temporarily with the aid of the at least one sensor. In one embodiment, this has the advantage that the temperature control circuit can be operated particularly efficiently, simply and / or reliably. In one embodiment, it is merely determined whether the temperature control medium (still at all) has a liquid content and in this case the compressor and / or the at least one further component of the temperature control circuit is controlled in such a way that this liquid content is reduced, preferably disappears.A temperature control medium or fluid present as wet steam or flowing in a (feed) line has a liquid fraction, measured particularly advantageously, for example, as mass mFlüssigkeit of the fraction of the temperature control medium or fluid in the liquid aggregate state, and a gas or vapor fraction, measured particularly advantageously, for example, as mass m Gas or m Dampf of the fraction of the temperature control medium or fluid in the gas or vapor aggregate state, wherein the gas or liquid fraction can be used or indicated for control particularly advantageously with respect to the entire temperature control medium or fluid, in particular its total mass, The present invention is not limited to this, in particular as a so-called vapor content x=m Dampf / ( mFlüssigkeit+M Dampf) or x=m Gas / ( mFlüssigkeit+m Gas) or liquid content y=mFlüssigkeit / (MFüs+M Dampf) or y=mFlüssigkeit / (MF+m Gas) or as a preferably proportional variable dependent thereon. Accordingly, in one embodiment, the vapor or liquid content is determined with the aid of the at least one sensor and the compressor and / or the at least one further component of the temperature control circuit is controlled on the basis of this determined vapor or liquid content.The temperature control circuit can be, in particular, a heating and / or cooling or cooling circuit, preferably for the temperature control, in particular heating and / or cooling, of a passenger compartment, engine, battery and / or at least one other component of a motor vehicle, in particular of a passenger car, the temperature control medium correspondingly being, in particular, a refrigerant. This represents particularly advantageous applications of the present invention on account of the conditions of use, without being limited thereto.According to one embodiment of the present invention, during operation of the temperature control circuit, the compressor and / or at least one further component of the temperature control circuit, which influences its operation, in particular a volume flow and / or a pressure and / or a temperature of the temperature control medium flowing through the temperature control circuit, is controlled in a development by at least one valve, in particular at least one control and / or at least one expansion valve, in one embodiment an expansion valve described below; and / or at least one heat exchanger, in one embodiment a heat exchanger described below; and / or at least one other component of the temperature control circuit; on the basis of or as a function of the proportion or content determined.Accordingly, according to one embodiment of the present invention, the temperature control circuit has a controller for controlling the compressor and / or the at least one further component of the temperature control circuit on the basis of the ascertained proportion or content during operation of the temperature control circuit or a controller for controlling the compressor and / or the at least one further component of the temperature control circuit is configured on the basis of the ascertained proportion or content during operation of the temperature control circuit in the manner described here, in particular by hardware and / or software, in particular by program technology, or the temperature control circuit is configured, in particular by hardware and / or software technology, for carrying out a method described here.In one embodiment, control comprises regulation or control on the basis of a one- or multi-dimensional (rule) difference or predefined setpoint and fed-back actual or measured variable.In that control or regulation is carried out on the basis of the gas or vapor or liquid content, temperature control medium which still has a liquid and a gas content or still as wet vapor can advantageously be supplied to the compressor in one embodiment, which is not possible in conventional p-T sensors, since both pressure and temperature are constant above the enthalpy in the wet vapor region. In one embodiment, it can be advantageously utilized that the liquid content in the compressor is reduced before the supply of a compressor stage, in particular by preferably electric heat sources, in particular (power) electronics, which are supplied with flow for cooling, or the temperature control medium is further, preferably at least substantially, completely evaporated and thus the compressor stage is advantageously supplied with at least substantially, completely evaporated or gaseous or vapor temperature control medium and the efficiency is thereby improved and / or a load on the compressor stage can be reduced.Accordingly, in one embodiment, the compressor has at least one compressor stage and a flow upstream of this compressor stage, wherein the temperature control medium which is fed from the feed line into the flow of the compressor still has a liquid and a gas fraction or is present as wet steam and is subsequently fed to the compressor stage and in the process or at the inlet of the compressor stage has a smaller or no liquid fraction, preferably is present at least substantially as gas or steam, particularly preferably is fed to the compressor stage as superheated steam, or the compressor and / or the at least one further component of the temperature control circuit is controlled or regulated on the basis of the fraction determined in such a way, in particular with this proviso or corresponding thereto. In one embodiment, this compressor stage is a compressor stage which is the most upstream or first (flowed against) in the flow direction of the compressor, wherein the compressor can have one or more compressor stages. "upstream" or "downstream" relates in the present case in each case to the flow direction of the temperature control circuit or compressor or the flow direction of the temperature control medium.In one embodiment, at least one electric heat source, in a preferred development an electronic system, particularly advantageously a power electronic system, is arranged in the feed line, which is cooled by the temperature control medium supplied from the feed line. As a result, the temperature control medium supplied as wet steam can advantageously be vaporized further, preferably completely, and particularly preferably still superheated before it is supplied to the (most upstream) compressor stage of the compressor, and advantageously at the same time the (power) electronics are cooled and the respective operation is thereby improved. In a development, an electrical and / or heating power of the at least one electrical heat source, preferably a theoretical or setpoint power or a detected or current actual power, is taken into account in the control of the compressor and / or of the at least one further component of the temperature control circuit. Preferably, a setpoint gas or vapor or liquid content of the temperature control medium is or is specified on the basis of this output, and the compressor and / or the at least one further component of the temperature control circuit is or is also controlled or regulated on the basis of this setpoint value, preferably in such a way or with the proviso that a difference between this setpoint value and an actual value determined with the aid of the at least one sensor is reduced, preferably minimized, wherein this setpoint value is or is specified, preferably taking into account the output of the electric heat source, in such a way that the temperature control medium does not have a liquid content (more) when being supplied to the compressor stage.In one embodiment, the temperature control circuit has one or more heat exchangers, particularly preferably at least one condenser and / or at least one evaporator, preferably downstream of the condenser, for cooling, in particular at least one condenser for at least partially condensing and / or at least one evaporator for at least partially evaporating the temperature control medium flowing through the (respective) heat exchanger, wherein the sensor is arranged between the compressor and the first heat exchanger upstream of the compressor.In one embodiment, the temperature control medium can advantageously emit heat to partners to be heated and / or the environment or absorb it from partners to be cooled and / or the environment in order to heat or heat or cool them. By the aforementioned placement of the sensor downstream of the last heat exchanger, the operation of the temperature control circuit or its compressor or at least one further component can be controlled particularly advantageously, in particular precisely(s), simply(s) and / or reliably(s). The one or more of these heat exchangers can / can be (in each case) a further (the) component(s) of the temperature control circuit, which is controlled or regulated on the basis of the proportion or content determined, preferably by one or more corresponding (control) valves, bypass bypass lines or the like.Additionally or alternatively, the temperature control circuit in one embodiment has at least one expansion valve for expanding the temperature control medium flowing through it, wherein the sensor is arranged between the compressor and the first expansion valve upstream of the compressor. By virtue of this placement of the sensor downstream of the last expansion valve, the operation of the temperature control circuit or of its compressor or of at least one further component can be controlled particularly advantageously, in particular precisely(s), simply(s) and / or reliably(s). The one or more of these expansion valve(s) can / can (in each case) be a further component(s)(s) of the temperature control circuit, which is controlled or regulated on the basis of the proportion or content determined.In one embodiment, the compressor and / or the at least one further component of the temperature control circuit is controlled on the basis of a predefined setpoint gas or vapor fraction or setpoint liquid fraction, in a development on the basis of a predefined setpoint vapor content or setpoint liquid content, of the temperature control medium, preferably in such a way or with the proviso that a difference between this setpoint gas or vapor fraction or setpoint vapor content and the (actual) gas or vapor fraction or (actual) vapor content determined with the aid of the at least one sensor, or a difference between this setpoint liquid fraction or setpoint liquid content and the (actual) liquid fraction or (actual) liquid content determined with the aid of the at least one sensor is reduced, preferably minimized, wherein in one embodiment the desired vapor content x soll is less than one and greater than zero or the desired liquid content y soll is less than one and greater than zero, i.e. is in each case in the wet vapor region. As a result, the temperature control circuit can be operated particularly easily, reliably and / or efficiently in one embodiment. In another embodiment, the setpoint liquid content y soll, is equal to zero or the setpoint vapor content x soll is equal to one, at least within the scope of a measurement and / or control tolerance.According to one aspect of the present invention, which can be combined particularly advantageously with the previously described aspect of the operation of a temperature control circuit, without the invention or this (further) aspect being limited thereto, in order to determine a gas or vapor or liquid fraction of a fluid which is present in a line as wet vapor, in particular flows, in a development of a vapor or liquid content of the fluid which is present in the line as wet vapor, in particular flows, in a preferred combination of the gas or vapor or liquid fraction or content of the temperature control agent which flows in the feed line of the temperature control circuit as wet vapor: a) vibrations caused by droplets in the wet vapor are detected with the aid of at least one acceleration sensor and the fraction or content is determined therefrom, in one embodiment, with the aid of an evaluation device and / or such that a first result value of the gas or vapor or liquid content is determined for a first measured value of a measured variable of the acceleration sensor characterizing the vibrations, and a second result value of the gas or vapor or liquid content is determined for a second measured value of the measured variable of the acceleration sensor characterizing stronger vibrations, which second result value characterizes a smaller gas or vapor content or a higher liquid content or more droplets in the wet vapor than the first result value; and / or b), with the aid of at least one ultrasonic sensor, a speed of sound in the wet vapor or a disturbance of a sound signal by droplets in the wet vapor is detected and the content is determined from this, in one embodiment, with the aid of an evaluation device and / or such that for a first measured value of a measured variable of the ultrasonic sensor characterizing the speed of sound, a first result value of the gas or vapor or liquid content and for a second measured value of the measured variable of the ultrasonic sensor characterizing a lower or lower speed of sound, a second result value of the gas or vapor or liquid content is determined, which identifies a smaller gas or vapor content or a higher liquid content or more droplets in the wet vapor than the first result value, or such that for a first measured value of a measured variable of the ultrasonic sensor characterizing the disturbance, a first result value of the gas or vapor or liquid content and for a second, A measurement value of the measurement variable of the ultrasonic sensor characterizing a greater disturbance is determined as a second result value of the gas or vapor or liquid content, which identifies a smaller gas or vapor content or a higher liquid content or more droplets in the wet vapor than the first result value; and / or c) is determined with the aid of at least one sensor having at least one heating element, in particular flowed against, acted upon by the fluid, in one embodiment heating wire, a measurement variable of a heat emission from the heating element to the fluid, in one embodiment cooling or a heating energy requirement of the heating element, and from this the content is determined, in one embodiment with the aid of an evaluation device and / or in such a way, a first result value of the gas or vapor or liquid content is determined for a first measured value of a measured variable of the sensor characterizing the heat emission and a second result value of the gas or vapor or liquid content is determined for a second measured value of the measured variable of the sensor characterizing a greater or higher heat emission, which second result value identifies a smaller gas or vapor or liquid content or a higher liquid content or more droplets in the wet vapor than the first result value; and / or d) with the aid of at least one sensor, which is acted upon by the fluid, in particular flowed against, and has electrodes, preferably comb electrodes, in particular interdigitated comb electrodes, acted upon by an alternating voltage, wherein the electrodes are covered in one embodiment by an electrical insulator, preferably at least one electrically insulating layer, a measurement variable of an electrical capacitance between the electrodes, which is dependent on the fluid, in particular on the different electrical permittivitys of droplets and gas or vapor, and the proportion or content is determined therefrom, in an embodiment with the aid of an evaluation device and / or in such a way that for a first measurement value of a measurement variable of the sensor characterizing the capacitance a first result value of the gas or vapor or liquid proportion or content and for a second measurement value of the measurement variable of the sensor characterizing a smaller or lower capacitance a second result value of the gas or vapor or liquid proportion or content is determined, which identifies a smaller gas or vapor proportion or content or a higher liquid proportion or content or more droplets in the wet vapor than the first result value, wherein, in an advantageous development, a heating structure is provided in order to reduce fogging of the sensor.As a result, a gas or vapor or liquid fraction of a fluid flowing as wet vapor in a line, in a development a vapor or liquid content of the fluid flowing as wet vapor in a line, can be determined particularly advantageously, in particular precisely(s), simply(s) and / or reliably(s).As already mentioned, the determination described here of a gas or vapor or liquid fraction of a fluid flowing as wet vapor in a line, in a development of a vapor or liquid content of the fluid flowing as wet vapor in a line, and the operation described here of the temperature control circuit can be combined in a particularly advantageous manner, without the invention being restricted thereto or to this combination. Accordingly, for operating the temperature control circuit or controlling the compressor and / or the at least one further component of the temperature control circuit on the basis of the determined proportion or content, this proportion or content can also be determined in another manner, in particular with the aid of at least one other than one of the sensors described above, or the gas or vapor or liquid proportion or content, as described above, of a fluid flowing as wet vapor in a line can be used in another manner, in particular for controlling and / or monitoring other technical systems.Accordingly, the use of a sensor for the determination described here of a gas or liquid fraction or content of a fluid flowing in a line as wet vapor, in particular for the operation described here of the temperature control circuit or for the control and / or monitoring of another technical system, and a corresponding arrangement having a line and an evaluation device and at least one sensor for the determination described here of a gas or vapor or liquid fraction, in particular a gas or vapor or liquid content, of a fluid flowing in a line as wet vapor, is also protected in particular.Further advantages and features are evident from the dependent claims and the exemplary embodiments. This is partially schematic: FIG. 1 : a motor vehicle having a temperature control circuit with an arrangement having a sensor according to one embodiment of the present invention; FIG. 2 is a structural diagram of a method according to an embodiment of the present invention; and FIG. 3 : shows a method according to one embodiment of the present invention.FIG. 1 shows a motor vehicle 10 with a temperature control circuit.The temperature control circuit has a compressor with at least one compressor stage 1.1 and a flow line 1.2 upstream of this compressor stage 1.1, in which at least one electric heat source in the form of power electronics 1.3 is arranged.Downstream of the compressor, a condenser 2 is arranged, to which temperature control medium is supplied by the compressor, as indicated in FIG. 1 by flow arrows. In the condenser 2, enthalpy is discharged to a vehicle interior, cooling water, ambient or cooling air or the like by condensation of the temperature control medium (cf. the upper horizontal line in the pressure(p) enthalpy(H) diagram of FIG. 3 ).Downstream of the condenser 2 a dryer 3 can be arranged, after which the tempering medium is present in liquid form. Subsequently, the liquid temperature control medium is expanded in an expansion valve 4 and fed to an evaporator 5, in which heat is absorbed from a vehicle interior, cooling water, a battery or another component of the vehicle to be cooled by only partial evaporation of the liquid temperature control medium or, if appropriate, of its liquid fraction (cf. the lower horizontal line in the p-H diagram of FIG. 3 ).Subsequently, the temperature control medium is supplied again as wet steam via a feed line 8, on or in which a sensor 6 is arranged, to the feed line 1.2 of the compressor (cf. the state marked "x soll, 1.2" in the p-H diagram of FIG. 3 ).In this, the temperature control medium cools the power electronics 1.3 and is thereby completely vaporized and (slightly) superheated (cf. the state marked "x soll, 1.1" in the p-H diagram of FIG. 3 ). In this (slightly) overheated state, the temperature control medium is fed to the (optionally most upstream) compressor stage 1.1 of the compressor and compressed by this(s).A controller 7 receives a steam content in the feed line from the sensor 6 and controls or regulates the compressor or its power electronics in such a way that a difference between this actual steam content determined by sensor and a predefined setpoint steam content x soll,1.1, which is just within the wet steam region ND, i.e. close to the dew line T, becomes minimal. Accordingly, a method according to an embodiment of the present invention according to FIG. 2 can have the steps S 10: determining a gas or liquid fraction, in the exemplary embodiment a vapor content, of the temperature control medium flowing in the feed line 8 as wet vapor; and S 20: controlling the compressor on the basis of this determined fraction or content.As a result, a strong overheating of the temperature control medium before entering the compressor or its feed line 1.2 is advantageously unnecessary, in order to control or regulate the compressor or temperature control circuit on the basis of pressure and temperature, which are detected with the aid of a p-T sensor, such that a charging of the (optionally most upstream) compressor stage with droplet-shaped temperature control medium is avoided, as a result of which the efficiency of the temperature control circuit can advantageously be improved.Sensor 6, feed line 8 and control 7 form an arrangement according to an embodiment of the present invention with a line 8 and an evaluation device 7 and at least one sensor 6 for determining a gas or liquid fraction of a fluid flowing in a line 8 as wet vapor.In one embodiment, the sensor 6 is an acceleration sensor, with which vibrations caused by droplets in the wet steam are detected and the proportion or content is determined from this with the aid of the evaluation device 7.In one embodiment, the sensor 6 is an ultrasonic sensor, with which a speed of sound in the wet steam or a disturbance of a sound signal by droplets in the wet steam is detected and the proportion or content is determined from this with the aid of the evaluation device 7.In one embodiment, the sensor 6 is a sensor having at least one heating element 6.1 against which the fluid flows, with which a measured variable of a heat emission from the heating element to the fluid is detected and the proportion or content is determined from this with the aid of the evaluation device 7.In one embodiment, the sensor 6 is a sensor, to which the fluid flows, which has electrodes (likewise indicated by 6.1 in FIG. 1 ) to which an alternating voltage is applied and with which a measurement variable of an electrical capacitance between the electrodes, which is dependent on the fluid, is detected and the proportion or content is determined from this with the aid of the evaluation device 7.Accordingly, a method according to an embodiment of the present invention according to FIG. 2 may have the steps S 10: detecting vibrations, a speed of sound, a disturbance of a sound signal, a measurement variable of a heat emission or an electrical capacitance dependent on the fluid; and S 20: determining therefrom a gas or liquid fraction of the fluid which flows in a line 8.In the present disclosure, "an X has" generally does not imply a exhaustive enumeration, but is a short form of "has at least one X" and also includes "has two or more X" and "has Y other than X". Although exemplary embodiments have been explained in the preceding description, it should be noted that a multiplicity of modifications are possible. It should also be noted that the exemplary embodiments are merely examples that are not intended to limit the scope, applications, and configuration in any way. Rather, the foregoing description provides those skilled in the art with a guide to the implementation of at least one exemplary embodiment, wherein various changes, in particular with regard to the function and arrangement of the described constituent parts, can be made without departing from the scope of protection as evident from the claims and combinations of features equivalent thereto.List of reference characters1.1 Compressor-compressor stage 1.2 compressor feed 1.3 compressor power electronics 2 condenser (heat exchanger) 3 dryer 4 expansion valve 5 evaporator (heat exchanger) 6 sensor 6.1 heating element / electrodes 7 control / evaluation device 8 (feed) line 10 motor vehicle LP wet steam region T dew line x soll, 1.2 setpoint steam content at the sensor upon entry of feed 1.2 upstream compressor and downstream evaporator x soll, 1.1 setpoint steam content at the sensor upon entry of compressor stage 1.1

Claims

Method for operating a temperature control circuit, which has at least one compressor (1.1-1.3); a feed line (8) for feeding temperature control medium into the compressor; and at least one sensor (6) for determining a gas or liquid fraction of the temperature control medium which flows in a feed line; wherein, during operation of the temperature control circuit, the compressor and / or at least one further component of the temperature control circuit is controlled on the basis of the determined fraction.Method according to claim 1, characterised in that the compressor has at least one compressor stage (1.1) and a feed line (1.2) upstream of this compressor stage, wherein the temperature control medium which is fed from the feed line into the feed line of the compressor has a gas and a liquid content and is subsequently fed to the compressor stage and in the process has a smaller or no liquid content.Method according to the preceding claim, characterized in that at least one electric heat source (1.3) is arranged in the feed line, which is cooled by the temperature control medium supplied from the feed line.Method according to one of the preceding claims, characterized in that the temperature control circuit has at least one heat exchanger (2, 5) for cooling the temperature control medium flowing through the latter, wherein the sensor is arranged between the compressor and the first heat exchanger upstream of the compressor.Method according to one of the preceding claims, characterized in that the temperature control circuit has at least one expansion valve (4) for expanding the temperature control medium flowing through it, wherein the sensor is arranged between the compressor and the first expansion valve upstream of the compressor.Method according to one of the preceding claims, characterized in that the compressor and / or the at least one further component of the temperature control circuit is controlled on the basis of a predetermined desired gas fraction or desired liquid fraction of the temperature control medium.Method according to one of the preceding claims, characterized in that the proportion is determined according to a method according to the following claim and / or the temperature control circuit is the temperature control circuit of a motor vehicle (10).Method for determining a gas or liquid fraction of a fluid which is present in a line (8) as wet steam, wherein vibrations caused by droplets in the wet steam are detected with the aid of at least one acceleration sensor and the fraction is determined therefrom; and / or a speed of sound in the wet steam or a disturbance of a sound signal by droplets in the wet steam is detected with the aid of at least one ultrasonic sensor and the fraction is determined therefrom; and / or a heat emission measurement quantity from the heating element to the fluid is detected with the aid of at least one sensor to which the fluid is applied and the fraction is determined therefrom; and / or a measurement quantity of an electrical capacitance between the electrodes dependent on the fluid is detected with the aid of at least one sensor to which the fluid is applied and which has electrodes to which an alternating voltage is applied and the fraction is determined therefrom.Use of a sensor (6) for determining the gas or liquid fraction of a fluid which is present in a line (8) as wet vapor according to the preceding claim, in particular for operating a temperature control circuit according to one of Claims 1 to 7.Arrangement having a line (8) and an evaluation device (7) and at least one sensor (6) for determining a gas or liquid fraction of a fluid which is present in the line as wet vapor according to Claim 8.Temperature control circuit, which has at least one compressor (1.1-1.3); a feed line (8) for feeding temperature control medium into the compressor; at least one sensor (6) for determining a gas or liquid fraction of the temperature control medium which flows in the feed line; and a controller (7) for controlling the compressor and / or at least one further component of the temperature control circuit on the basis of the determined fraction during operation of the temperature control circuit; wherein the temperature control circuit is configured to carry out a method according to one of the preceding claims.Controller (7) for controlling the compressor and / or the at least one further component of a temperature control circuit according to the preceding claim on the basis of the ascertained proportion during operation of the temperature control circuit for carrying out a method according to one of the preceding claims.Motor vehicle (10) having a temperature control circuit according to Claim 11.

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