DE102017006316A1 - Thermal generator, method for its operation and heating arrangement - Google Patents

Abstract

The invention relates to a thermal generator (2) for converting mechanical rotary movements into thermal energy, comprising a rotor (3) rotatable about a rotation axis (X) with a magnet arrangement (6), a stator (4) in which, during a movement of the rotor (FIG. 3) induce electrical currents and a heat exchanger (5) thermally coupled to the stator (4) for receiving heat energy resulting from the induced currents in the stator (4) and delivering them to a heat transfer medium (M). According to the invention, the heat exchanger (5) comprises at least one inlet (5.1) for feeding the heat transfer medium (5) and at least one outlet (5.2) for discharging the heat transfer medium (M). The input (5.1) and the output (5.2) are fluidically coupled to a bypass arrangement (10) and the bypass arrangement (10) comprises a control device (11) which has a mixing ratio of the heat transfer medium (M) present in an inlet on one inlet and in one Outflow on the output side adjacent heat transfer medium (M) controls.
The invention further relates to a method for operating a thermal generator (2) for converting mechanical rotational movements into thermal energy and a heating arrangement (1).

Description

The invention relates to a thermal generator according to the preamble of claim 1.

The invention further relates to a method for operating a thermal generator according to the preamble of claim 6 and a heating arrangement.

From the WO 2014/167429 A1 For example, a rotating thermal generator is known which converts mechanical rotary motion into thermal energy. The generator operates on the basis of induced currents, also referred to as Foucault currents, which are generated by alternating magnetic fields. On a designed as a rotor movable unit which rotates about an axis with bearings, magnets are arranged. A magnetic field generated by permanent magnets is closed by a ferromagnetic stator. The movement of the rotor induces currents in the ferromagnetic stator, with the induced currents heating the stator. This converts the energy of the mechanical rotation into heat energy. The stator is homogeneous or made of a plurality of metals, for example copper and steel, aluminum and steel or another structural connection of low-resistance metals with ferromagnetic materials. The heat is transferred from the stator to a stator mounted on the heat exchanger of ribs. The heated stator and the heat exchanger release heat into a surrounding medium and thus transfer the heat into air or other gas.

The invention is based on the object to provide a comparison with the prior art improved thermal generator, an improved method for operating a thermal generator and a heating arrangement.

With regard to the thermal generator, the object is achieved by the features specified in claim 1, in terms of the method by the features specified in claim 6 and in terms of the heating arrangement by the features specified in claim 10.

Advantageous embodiments of the invention are the subject of the dependent claims.

The thermal generator for converting mechanical rotary motion into thermal energy comprises a rotor rotatable about a rotation axis with a magnet arrangement, a stator in which electrical currents are induced upon movement of the rotor, and a heat exchanger coupled thermally to the stator for receiving a due to the induced currents in the stator resulting heat energy and to deliver this to a heat transfer medium.

According to the invention, the heat exchanger comprises at least one inlet for supplying the heat transport medium and at least one outlet for discharging the heat transport medium. In this case, the input and the output are fluidically coupled to a bypass arrangement and the bypass arrangement comprises a control device. The control device regulates a mixing ratio of the heat transfer medium applied in an inlet on the inlet side and of the heat transfer medium present in an outflow on the outlet side.

By means of the bypass and its control device, it is possible to carry out a regulation of a temperature of the heat transfer medium supplied to the inlet of the heat exchanger and thus to increase a coefficient of performance of the thermal generator, also referred to as a coefficient of performance (COP for short).

According to a possible embodiment of the thermal generator, a control variable of the control device is the temperature of the heat transfer medium fed to the inlet of the heat exchanger, the temperature in a possible embodiment of the thermal generator being at least 40 ° C. As a result, the efficiency of the thermal generator is increased by a cold start phase thereof can be significantly shortened. Such a shortened cold start phase is particularly advantageous in an automotive application of the thermal generator, since both a power consumption of a vehicle can be reduced as well as a passenger comfort can be increased.

A possible development of the thermal generator provides that the control device comprises a regulator which regulates a volume flow of the heat transport medium in the inlet. By means of this volume flow control, in particular as a function of an operating state of the heat exchanger, a further shortening of the cold start phase of the thermal generator is possible.

In one possible embodiment of the thermal generator, the stator is coupled to at least one drive unit, wherein the drive unit is coupled to a speed controller, which regulates a speed of the drive unit. Also by the speed control, in particular as a function of an operating state of the heat exchanger, a further reduction of the cold start phase of the thermal generator is possible.

In the method of operating a thermal generator for converting mechanical rotary motion into heat energy, a rotor rotated with a magnet arrangement about a rotation axis. Furthermore, electrical currents are induced in a stator during a movement of the rotor and by means of a heat exchanger coupled thermally to the stator, a heat energy resulting from the induced currents in the stator is absorbed and transmitted to a heat transport medium.

According to the invention by means of a control device of a bypass arrangement which is fluidically coupled with at least one input for supplying the heat transfer medium in the heat exchanger and at least one output for discharging the heat transfer medium from the heat exchanger, a mixing ratio of the input side in an inlet heat transfer medium and the output side in a flow adjacent Wärmerans.portmediums regulated as a function of a temperature of the input of the heat exchanger heat transfer medium supplied.

The method makes it possible to control the temperature of the heat transfer medium fed to the inlet of the heat exchanger and thus to increase the coefficient of performance of the thermal generator, also referred to as the coefficient of performance (COP for short).

According to a possible embodiment of the method, the temperature is set to at least 40 ° C. As a result, the efficiency of the thermal generator is increased by a cold start phase thereof can be significantly shortened. Such a shortened cold start phase is particularly advantageous in an automotive application of the thermal generator, since both a power consumption of a vehicle can be reduced as well as a passenger comfort can be increased.

According to another possible embodiment of the method, a volume flow of the heat transport medium in the inlet is regulated by means of the control device as a function of an operating state of the heat exchanger. By means of this volume flow control, in particular as a function of an operating state of the heat exchanger, a further shortening of the cold start phase of the thermal generator is possible.

A possible development of the method provides that a speed of a drive unit driving the rotor is regulated by means of a speed controller as a function of an operating state of the heat exchanger. Also by the speed control, in particular as a function of an operating state of the heat exchanger, a further reduction of the cold start phase of the thermal generator is possible.

The heating arrangement according to the invention comprises at least one previously described thermal generator and at least one thermally coupled to the input and the output of the heat exchanger of the thermal generator consumer, in which the heat transport medium is guided. This consumer is coupled to a heater, which supplies heat energy to the heat transfer medium in response to a temperature of the heat transfer medium supplied to the input of the heat exchanger.

The heater allows in addition to a Zuheizfunktion for the heat transfer medium in the consumer and a faster heating of the same and by supplying the heat transfer medium in the supply to the heat exchanger, a further reduction of the cold start phase of the thermal generator.

Embodiments of the invention will be explained in more detail below with reference to a drawing.

• 1 schematisch ein Schaltbild einer Heizanordnung.

Showing:

• 1 schematically a circuit diagram of a heating arrangement.

In the only one 1 is a circuit diagram of a possible embodiment of a heating arrangement according to the invention 1 shown. The heating arrangement 1 is for example an application in a vehicle or in a heating system of a residential building for heating a heat transport medium M , such as water.

The heating arrangement 1 includes a thermal generator 2 for converting mechanical rotations into heat energy. For this purpose, the thermal generator comprises 2 one around a rotation axis X rotatable rotor 3 , a stator 4 and one thermally with the stator 4 coupled heat exchanger 5 ,

The rotor 3 includes a magnet assembly 6 with a plurality of magnets 6.1 to 6.3 , where the magnets 6.1 to 6.3 Electromagnets or permanent magnets are. The permanent magnets are for example applied to an aluminum disc neodymium magnets.

The rotor 3 is with a drive unit 7 , For example, an electric motor with a maximum power of 3 kW to 6 kW coupled, which this around the axis of rotation X rotates. With a movement of the rotor 3 around this axis of rotation X become electric currents in the stator 4 induced. The resulting eddy current losses lead to a heating of the stator 4 , One in the stator 4 resulting Heat energy is from the heat exchanger 5 taken up and to the heat transport medium M issued. The heat exchanger 5 is executed here in the form of a water channel and consists for example of aluminum, especially aluminum pipes. It can be surrounded to the outside with a stainless steel sheath. Alternatively, the heat exchanger 5 completely made of stainless steel.

The heating arrangement 1 also includes a consumer 8th , For example, a so-called hot water reservoir, a water boiler or a heating system, which with another heat transport medium M ' is filled. The consumer 8th is for example designed such that the further heat transport medium M ' has a temperature of 60 ° C. To transfer the means of the heat transfer medium M transported heat energy to the other heat transport medium M ' is within the consumer 8th another heat exchanger 9 arranged, which fluidly with the heat exchanger 5 coupled and from the heat transport medium M is flowed through.

An efficiency of heat transfer within the thermal generator 2 on the heat transport medium M is in particular of parameters of the heat transport medium M in an inlet at an entrance 5.1 of the heat exchanger 5 dependent. These parameters include a temperature, ie a flow temperature, of the heat transport medium M at the entrance 5.1 and a volume flow thereof. Also, the effectiveness of the heat transfer within the thermal generator 2 depending on a speed of the drive unit 7 ,

To a coefficient of performance of the thermal generator 2 , also called Coefficient of Performance (COP for short), is a bypass arrangement 10 provided, which fluidly with the input 5.1 and an exit 5.2 of the heat exchanger 5 is coupled.

The bypass arrangement 10 includes a control device 11 , which is a mixing ratio of the heat transfer medium present in the inlet on the inlet side M and the heat transfer medium applied in an outlet on the output side M regulates.

For this purpose, the control device comprises 11 a regulator 12 , which with a first temperature sensor 13 , For example, a thermistor is coupled. This first temperature sensor 13 detects an actual temperature of the heat transport medium M at the entrance 5.1 of the heat exchanger 5 , The regulator 12 is still with a second temperature sensor 14 , For example, a thermistor coupled, which is an actual temperature of the heat transport medium M at the exit 5.2 of the heat exchanger 5 detected.

To increase the coefficient of performance of the thermal generator 2 , Especially in a cold start phase thereof, the temperature of the heat transport medium M at the entrance 5.1 of the heat exchanger 5 regulated so that it is at least 40 ° C. For this purpose, the controller controls 12 depending on the means of the temperature sensors 13 . 14 detected temperatures of the heat transport medium M an actuator 15 , For example, a three-way valve, to, the mixing ratio of the input side adjacent to the heat transfer medium M and the heat transfer medium applied in the outlet on the output side M and consequently the temperature of the heat transport medium M at the entrance 5.1 of the heat exchanger 5 adjust.

To the temperature of the heat transport medium M at the entrance 5.1 of the heat exchanger 5 in addition to influence or the cold start phase of the thermal generator 2 to bridge is the consumer 8th coupled to a heater 16, which the further heat transport medium M ' depending on the temperature of the input 5.1 of the heat exchanger 5 supplied heat transport medium M Heat energy supplies. For example, this is the further heat transport medium M ' by means of a speed-controlled pump 17 with a pump power of, for example, 2 m ³ / h to 3 m ³ / h by the heater 16 feasible. The heater 16 For example, has a heating power of 7 kWth to 17 kWth, so that a temperature difference of 5 K to 6 K between an input of the heater 16 and an outlet of the heater 16 in the further heat transport medium M ' results.

For adjusting the volume flow of the heat transport medium M depending on an operating state of the heat exchanger 5 to maximize the coefficient of performance of the thermal generator 2 is another variable speed pump 18 provided, which has a pump power of, for example, 0.5 m ³ / h to 2 m ³ / h and a flow of the heat transport medium M from the exit 5.2 of the heat exchanger 5 through the other heat exchanger 9 in the consumer 8th back to the entrance 5.1 of the heat exchanger 5 and through it to its exit 5.2 generated. On the one hand, the volume flow of the heat transfer medium M doing so by the speed control of the pump 18 adjustable and on the other hand by several volume flow limiters 19 to 21 ,

Furthermore, depending on the operating state of the heat exchanger 5 the speed of the drive unit 7 set such that the coefficient of performance of the thermal generator 2 is maximized.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2014/167429 A1 [0003]

Claims (10)

Thermal generator (2) for converting mechanical rotary motion into thermal energy, comprising - a rotor (3) rotatable about an axis of rotation (X) with a magnet arrangement (6), - a stator (4) in which, during a movement of the rotor (3) inducing electrical currents and - a heat exchanger (5) thermally coupled to the stator (4) for receiving a heat energy resulting from the induced currents in the stator (4) and delivering them to a heat transfer medium (M), characterized in that - the heat exchanger (5) at least one input (5.1) for supplying the heat transfer medium (M) and at least one output (5.2) for discharging the heat transfer medium (M), - the input (5.1) and the output (5.2) with a bypass arrangement (10) are fluidically coupled and - the bypass arrangement (10) comprises a control device (11) having a mixing ratio of the input side in an inlet heat transfer medium (M) and in an A on the outlet side adjusts the heat transfer medium (M). Thermal generator (2) after Claim 1 , characterized in that a controlled variable of the control device (11) is a temperature of the input (5.1) of the heat exchanger (5) supplied heat transport medium (M). Thermal generator (2) according to Claim 2 , characterized in that the temperature is at least 40 ° C. Thermal generator (2) according to one of the preceding claims, characterized in that the control device (11) comprises a regulator (12) which regulates a volume flow of the heat transport means (M) in the inlet. Thermal generator (2) according to one of the preceding claims, characterized in that - the stator (4) is coupled to at least one drive unit (7), wherein - the drive unit (7) is coupled to or comprises a speed controller, which has a speed the drive unit (7) controls. Method for operating a thermal generator (2) for converting mechanical rotary movements into thermal energy, in which - a rotor (3) with a magnet arrangement (6) is rotated about an axis of rotation (X), - into a stator (4) during a movement of the rotor (3) electrical currents are induced and - by means of a thermally coupled to the stator (4) heat exchanger (5) due to the induced currents in the stator (4) resulting heat energy is absorbed and transmitted to a heat transfer medium (M), characterized in that - By means of a control device (11) of a bypass arrangement (10) having at least one input (5.1) for supplying the heat transfer medium (M) in the heat exchanger (5) and at least one output (5.2) for discharging the heat transport medium (M) from the Heat exchanger (5) is fluidically coupled, a mixing ratio of the inlet side in an inlet heat transfer medium (M) and the output side in a flow lying heat transport medium (M) in response to a temperature of the input (5.1) of the heat exchanger (5) supplied heat transport medium (M) is controlled. Method according to Claim 6 , characterized in that the temperature is set to at least 40 ° C. Method according to Claim 6 or 7 , characterized in that by means of the control device (11) a volume flow of the heat transport means (M) in the inlet in response to an operating condition of the heat exchanger (5) is regulated. Method according to one of Claims 6 to 8th , characterized in that by means of a speed controller, a speed of the rotor (3) driving the drive unit (7) in response to an operating state of the heat exchanger (5) is controlled. Heating arrangement (1), comprising - at least one thermal generator (2) according to one of Claims 1 to 5 and - at least one with the input (5.1) and the output (5.2) of the heat exchanger (5) of the thermal generator (2) thermally coupled consumer (8) in which the heat transfer medium (M) is guided, wherein - the consumer (8 ) is coupled to a heating device (16) which supplies heat energy to the heat transport medium (M) as a function of a temperature of the heat transport medium (M) supplied to the inlet (5.1) of the heat exchanger (5).

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