DE202016008761U1 - Heating system component with a compact temperature sensor design - Google Patents

Abstract

A heating system component (100) for a heating system for heating a fluid medium, the heating system component (100) comprising:
a carrier unit (110);
a heating unit (120) coupled to the carrier unit (110);
wherein the carrier unit (110) has a wet side and a dry side, the wet side of a surface corresponding to the carrier unit (110) configured to be in contact with the fluid medium, the dry side being on one of the wet side arranged opposite surface; and wherein the heating unit (120) is received in a recess (112) provided on the dry side of the support unit (110), and
at least one temperature sensor (180a, 180b), particularly an NTC thermistor, wherein the temperature sensor (180a, 180b) is in effective thermal contact with at least a portion of a dry surface upper side of the support unit (110), the upper side portion the carrier unit (110) is in contact with the fluid medium at the wet side, and wherein the part of the upper side of the carrier unit (110) is effectively thermally insulated from the heating unit (120); characterized in that the temperature sensor (180a, 180b) within the recess (112) of the carrier unit (110) by means of a shielding unit (181) of the heating unit (120) is provided shielded.

Description

FIELD OF THE INVENTION

The invention relates to a heating system component for heating a fluid medium in a heating system of a household appliance, in particular to a heating system component comprising at least one temperature sensor.

BACKGROUND OF THE INVENTION

For many types of home appliances or household appliances, it is necessary to use a fluid medium, such as e.g. Water, to heat. The heating can be accomplished by means of one or more heating systems. For this purpose, a medium circuit may be provided, wherein a pump disposed in the circuit causes a circulation of the medium in the circuit.

Basic aspects of such heating systems are that, like all other components of the medium cycle, the system takes up little space and should be inexpensive to manufacture. Furthermore, the heating system should be easy to assemble. Reliable protection of the heating system must be guaranteed in the event of a critical operating condition, which may cause plastic components in the appliance to melt or catch fire. In the case of some household appliances, it may also be necessary to protect the medium to be heated from exceeding a predetermined temperature. For example, in the case of a dishwasher, it may be necessary to protect the rinse water from exceeding its boiling temperature.

The US Patent Application 2006/0236999 A1 discloses a heating system for heating fluid media, in particular for domestic appliances, which includes a carrier unit, a heating unit arranged on the carrier unit and a heat transfer element which is arranged on the carrier unit and comprises a material which is a good heat conductor. On the heat transfer element temperature protection devices are mounted by means of fixing elements through corresponding through holes.

It is a general task in the manufacture of heating systems and heating system components to provide ever smaller and more compact components that provide sufficient heating power (if not the same heating power as before). It is another task to reduce manufacturing costs.

In addition, if conventional temperature monitoring and / or control elements (such as thermal fuses) are used with continuous flow water heaters, there is a problem if the temperature monitoring and / or control elements are connected to e.g. one or more screws are fixed on a mounting plate. That is, when the mounting plate is soldered to the heating unit, it can bend. Further, when corresponding fixing screws are tightened to a temperature monitoring and / or control element, the temperature monitoring and / or control element can be lifted off the fixed plate and remain in the air above the hot spot. Consequently, most of the heat in the center of the heating unit can not be delivered directly to the temperature monitoring and / or control element, but has to be dissipated via e.g. the mounting plate, screws and / or the base plate flange are delivered. These effects result in an unacceptable (i.e., too slow) response time of the temperature monitor and / or controller. Accordingly, it would be advantageous to mount a temperature sensor directly at the location where a particular temperature is to be monitored. NTC thermistors are temperature sensors that are well known in the art. However, the very cost-effective NTC thermistors must not be permanently exposed to temperatures above 100 ° C. Since a heating unit of a heating system component usually reaches temperatures in excess of 100 ° C, inexpensive NTC thermistors are usually not suitable for being mounted directly on or near the heating unit within the heating system component, thereby preventing more compact design.

It is therefore an object of the present invention to provide a heating system component which avoids the disadvantages of prior art heating systems.

OVERVIEW OF THE INVENTION

According to a first aspect of the present invention, there is provided a heating system component for a heating system for heating a fluid medium, the heating system component comprising a carrier unit and a heating unit coupled to the carrier unit. The carrier unit comprises a wet side and a dry side, the wet side of a surface corresponding to the carrier unit configured to be in contact with the fluid medium while the dry side is disposed on a wet side opposite surface; and wherein the heating unit is recessed in a recess provided on the dry side of the carrier unit. The heating system component further comprises at least one temperature sensor, in particular an NTC thermistor, wherein the temperature sensor effectively in thermal contact with at least a part of an upper surface of the dry side of the carrier unit, wherein the part of the upper side of the carrier unit is in contact with the fluid medium on the wet side, and wherein the part of the upper side of the carrier unit is effectively thermally insulated from the heating unit. Furthermore, the temperature sensor is provided inside the recess of the carrier unit by means of a shielding unit shielded from the heating unit.

To effectively be in thermal contact with at least a portion of a dry surface upper surface of the carrier unit, direct contact of the temperature sensor with the upper surface of the dry side of the carrier unit is required. However, the effective thermal contact should be understood to provide a thermal contact that permits measurement of the fluid medium circulating on the wet side of the carrier unit. The thermal contact is thus intended to ensure that a large influence on the measured temperature comes from the fluid medium on the wet side of the carrier unit. The temperature sensor may also measure a mixing temperature of the fluid and the heating unit. By providing the temperature sensor, in particular an NTC thermistor, which is in effective thermal contact with at least a part of a dry surface upper surface of the carrier unit, the at least part of the upper side of the carrier unit being effectively thermally insulated from the heating unit can be ensured be that the temperature sensor is not exposed to temperatures exceeding the maximum temperature of circulating on the wet side of the carrier unit fluid, which is equal to 100 ° C in the usual household appliances. With this temperature characteristic, it is possible to use ordinary inexpensive NTC thermistors, which further allows a compact design of the heating system component with a reduced material cost.

In a further embodiment of the heating system component, the shielding unit is preferably made of stainless steel or alumina. In another preferred implementation, a second temperature sensor within the cavity is shielded by a heater unit from the heater unit, the resulting temperature being derived from a mean temperature measured by the first and second temperature sensors. In another preferred implementation, the first and second temperature sensors are each NTC thermistor pellets potted between the dry side of the carrier unit and the shielding unit in epoxy resin. The compact yet inexpensive design provided by this embodiment allows reliable measurement of fluid temperature on the wet side of the carrier unit while allowing for easy assembly of the heating system component within a corresponding domestic appliance. Since the temperature measuring components are provided within the recess, the risk of damage during assembly is significantly reduced.

It will be understood that a preferred embodiment of the invention may be any combination of the dependent claims or the above embodiments with the respective independent claim.

These and other aspects of the invention will become apparent from the embodiments described below.

list of figures

• 1 zeigt schematisch und beispielhaft eine Ausführungsform einer Heizsystemkomponente;
• 2a und 2b zeigen schematisch und beispielhaft eine Querschnittsansicht der Heizsystemkomponente gemäß 1;
• 3a und 3b zeigen schematisch eine erfindungsgemäße Ausführungsform einer Heizsystemkomponente;
• 4 zeigt schematisch und beispielhaft eine weitere Ausführungsform einer Heizsystemkomponente;
• 5a und 5b zeigen schematisch und beispielhaft eine weitere Ausführungsform einer Heizsystemkomponente;
• 6a und 6b zeigen schematisch und beispielhaft eine weitere Ausführungsform einer Heizsystemkomponente;
• 7 zeigt schematisch und beispielhaft eine weitere Ausführungsform einer Heizsystemkomponente.

In the following drawings:

• 1 shows schematically and by way of example an embodiment of a heating system component;
• 2a and 2 B show schematically and by way of example a cross-sectional view of the heating system component according to 1 ;
• 3a and 3b schematically show an embodiment of a heating system component according to the invention;
• 4 shows schematically and by way of example a further embodiment of a heating system component;
• 5a and 5b show schematically and by way of example a further embodiment of a heating system component;
• 6a and 6b show schematically and by way of example a further embodiment of a heating system component;
• 7 shows schematically and by way of example a further embodiment of a heating system component.

DETAILED DESCRIPTION OF THE EMBODIMENTS

1 shows schematically and by way of example an embodiment of a heating system component 100 , The heating system component 100 comprises a carrier unit 110 and a heating unit 120 ,

The heating system component 100 For example, may be connected to a pump of a household appliance, such as - but not limited to - a dishwasher. The heating system component 100 can be attached to the feed pump or to a feed pump housing during assembly of the household appliance. In one another example may be the heating system component 100 form a preassembled together with the pump unit.

How out 1 becomes clear, is the carrier unit 110 a circular disk. The carrier unit 110 has a circular hole concentric with its central axis (not shown) 111 on, through which a suction pipe of the feed pump is guided in sealing unit with respect to the medium. At its peripheral edge, the carrier unit 110 reach over the edge of the feed pump housing, in sealing unit with respect to the medium. This back of the carrier unit 110 , as in 1 is shown, is in direct contact with the medium to be heated in the installed state of the pump and therefore can be considered the wet side 101 be designated while the side of the carrier unit 110 , in the 1 shown is not in contact with the medium and thus as the dry side 102 can be designated.

The heating unit 120 is on the dry side 102 the carrier unit 110 arranged as in 2a which is a cross-sectional view taken along the line AA in 1 shows. The heating unit 120 is achieved by means of a coupling step with the carrier unit 110 coupled. The coupling step may include a soldering step, a laser welding step, an adhesion step, an ultrasonic welding step, and / or a friction welding step.

The carrier unit 110 may comprise a composite material. The composite material comprises at least an aluminum layer and a stainless steel layer. The stainless steel layer is on the wet side 101 the carrier unit 110 arranged. The aluminum layer is on the dry side 102 the carrier unit 110 arranged. In one example, the composite material may be manufactured by a cold roll bonding process.

In the in 1 illustrated embodiment, the carrier unit 110 also a depression 112 , The depression 112 is configured for the heating unit 120 take. The heating unit 120 has a first cross-section perpendicular to an axial direction of the heating unit 120 is. The first cross section may have a rectangular shape, a hat-shaped trapezoidal shape with rounded corners, or a bell-like trapezoidal shape with rounded corners.

In the in 1 illustrated embodiment corresponds to a cross section of the recess 112 the first cross section of the heating unit 120 , More precisely, the heating unit 120 in the depression 112 arranged as in 2a is shown. The cross section of the depression 112 and the cross section of the heating unit 120 are chosen so that at least a part of a surface of the heating unit 120 and part of the dry side 102 to form a flat surface. In 2a are all three sides of the heating unit 120 with the surfaces of the recess 112 the carrier unit 110 welded. The necessary close contact between the surfaces of the heating unit 120 and the carrier unit 110 can be achieved by applying a pressure bias of the heating unit 120 during the coupling step. Optionally, a thermally conductive paste 122 on one or both surfaces of the carrier unit 110 and the heating unit 120 be applied. By using a thermally conductive paste problems can be avoided, the occurrence of voids between the carrier unit 110 and the heating unit 120 are assigned.

Another way to address the problems that an occurrence of voids between the carrier unit 110 and the heating unit 120 is to associate a phase change connection between the carrier unit 110 and the heating unit 120 to arrange. Such a compound changes its phase state above its phase change temperature and is therefore capable of filling cracks, voids, slits and the like. In one embodiment, the phase change compound is on the surfaces of the carrier unit 110 and / or the heating unit 120 applied by means of a distribution step. Spreading typically implies that the phase change compound dries within a short period of time.

In the in 1 illustrated embodiment includes the heating system component 100 furthermore a temperature sensor 170a , preferably an NTC thermistor (NTC = negative temperature coefficient), which is connectable to a processing unit of the household appliance to the temperature of the wet side of the heating system component 100 circulating fluid to measure. NTC thermistors offer a cost-effective way to determine the temperature. However, such conventional inexpensive NTC thermistors only withstand continuous operation in a temperature range of up to 100 ° C. Because the heating unit 120 Usually reaches temperatures above 100 ° C, the NTC thermistor must 170a from the heating unit 120 thermally shielded to ensure a certain durability, while avoiding the use of more expensive NTC thermistors that can withstand higher temperatures. Therefore, the heating unit 120 on an outer peripheral part of the carrier unit 110 by means of a heat-conducting plate 140 covered the depression 112 covers. The thermally conductive plate 140 can be a protruding part 141 include, extending toward an inner peripheral part 113 the carrier unit 110 extends. This projecting part 141 is in direct contact with the dry side 102 the carrier unit 110 , As on the opposite side of the support unit 110 , the wet side 101 In operation, the fluid circulates, reflecting the temperature of the carrier unit 110 and thus the temperature of the projecting part 141 the heat-conducting plate 140 about the temperature of the fluid again. To measure the fluid temperature is the NTC thermistor 170a therefore on the preceding part 141 the heat-conducting plate 140 assembled. To heat transfer from the heating unit 120 to the preceding part 141 on which the NTC is mounted, can control the heat-conducting plate 140 a detached section 142 at an outer peripheral part above the heating unit 120 at the same angle as the protruding part 141 which extends toward the center. 2 B shows a cross-sectional view taken along the line BB in 1 , 2 B shows that is between the detached section 142 the heat-conducting plate 140 and the heating unit 120 a room is located. The above part 141 is in contact with the detached section 142 but is toward the upper surface of the carrier unit 110 inclined. Preferably, the angled extension is the detached portion 142 slightly wider than the angular extension of the protruding part 141 , The thermally conductive plate 140 can additionally with grooves 143 at the detached section 142 Be provided facing both sides of the angled extension of the detached section 142 are provided, wherein the length of the grooves 143 the amount of heat affected by that of the unreleasured section 144 the heat-conducting plate 140 to the previous section 141 is directed.

Optionally, a second NTC thermistor may be provided, also on another detached portion 142 to determine the fluid temperature so that the first and second NTC thermistor measurements can be averaged to increase reliability. Alternatively, the second NTC thermistor 170b at the unreleasured section 144 the heat-conducting plate 140 be mounted to the temperature of the heating unit 120 determine, for example, to prevent the pump from running dry. In the latter case, an NTC thermistor must be chosen that can withstand the resulting temperatures achievable by the heating unit.

In the in 3a schematically illustrated embodiment of the invention is a heating system component 100 shown, the one or more temperature sensors, preferably NTC thermistors 180 , within the recess 112 having. The in the depression 112 the carrier unit 110 used heating unit 120 has connecting pins 123 at both ends of the heating unit 120 on. These connecting pins 123 are not within the recess 112 but protrude in the direction of an axial direction to be connected to a power source. The temperature sensor 180 is therefore preferably in the portion of the recess 112 provided, not by the heating unit 120 is covered, and is below the connector pins 123 arranged. To the temperature sensor 180 from the heating unit 120 shield is a shielding unit 181 inside and preferably form-fitting with the walls of the recess 112 intended. The shielding unit 181 is made of a heat-insulating material, such as, but not limited to, stainless steel. As in the cross-sectional view of 3b shown, the shielding unit 181 a hollow chamber 182 on, in which the temperature sensor 180a , preferably in the form of an NTC tablet. To the NTC thermistor inside the hollow chamber 182 To fix, an epoxy resin in the chamber 182 injected, preferably a temperature-resistant two-component resin. Optionally, in turn, a second NTC thermistor 180b inside the hollow chamber 182 be provided to determine an average temperature of the fluid on the wet side 101 the carrier unit 110 circulated. The compact yet inexpensive design provided by this embodiment allows reliable measurement of the fluid temperature on the wet side 101 the carrier unit 120 , and provides easy installation of the heating system component 100 within a corresponding household appliance. Since there are no components that protrude from the dry side of the carrier unit, the risk of damage during assembly is significantly reduced.

4 schematically shows another embodiment in which one or more NTC thermistors 270a . 270b on appropriate blocks or pads 250a . 250b are provided, which are made of a ceramic material. Every block 250a . 250b is on the thermally conductive plate 240 fixed by means of a positive connection. The thermally conductive plate 240 covers at least parts of an inner peripheral portion 113 the carrier unit 110 off, leaving one on the protruding part 241 the heat-conducting plate 240 Mounted NTC thermistor 270a the temperature of the wet side 101 the carrier unit 110 circulating water. If again a second NTC thermistor 270b should be provided, the second NTC thermistor 270b either at a further portion of the inner peripheral portion 113 the carrier unit 110 be arranged, or the heat-conducting plate 240 can also at least sections 244 the depression 112 in which the heating unit 120 embedded, cover, leaving the second NTC thermistor 270b the temperature of the heating unit 120 even in addition to the water temperature can measure. The ladder paths 261 containing the NTC thermistors 270a . 270b connected to an external processing unit (not shown) are connected to the NTC thermistors 270a . 270b electrically connected, the NTC thermistors 270a . 270b and the ladder paths 261 covered with a synthetic resin. The ladder paths 261 are preferably along the heat-conducting plate 240 guided, wherein a thin heat-insulating layer 260 , preferably a thin film, between the conductor paths 261 and the heat-conducting plate 240 is provided. The thin heat-insulating layer 260 is preferably made of polyimide Kapton. However, any other suitable polyimide, polyamide or polyester may be used instead. In a preferred embodiment, a single plug 300 used to connect the connection pins 123 the heating unit 120 via appropriate pins 302 supply electrical power and a connection between the conductor paths 261 of one or more NTC thermistors 270a . 270b and an external processing unit. Preferably, the heat-conducting plate 240 through the connector assembly 300 via an appropriate connection 301 grounded. The compact design in turn offers advantages during assembly of the heating system component 100 within a parent component in which the heating system component 100 is integrated. With a single plug 300 for connecting the heating unit 120 and the one or more temperature sensors 270a . 270b reduces the complexity during assembly, as well as the required material costs.

In the 5a schematically illustrated embodiment also shows a heating system component 100 with a thermally conductive plate 340 , wherein at least a part 341 the heat-conducting plate 340 in direct contact with the dry side 102 the carrier unit 110 stands, and where one or more NTC thermistors 370a . 370b as well as ladder paths 361 provided with an insulating layer 360 , preferably in the form of a thin film, between the heat-conducting plate 340 and the NTC thermistors 370a . 370b and the ladder paths 361 , The insulating layer 360 , one or more NTC thermistors 370 and the corresponding conductor paths 361 are on the thermally conductive plate 340 printed or sprayed as thin layers, with the insulating layer 360 is preferably made of a ceramic material and is provided as a first layer, and the NTC thermistors 370 and the corresponding conductor paths 361 are provided on top of this first layer. The heating system component 100 again preferably with a single plug 300 be provided as in 5b shown, which is designed to provide electrical power to the connecting pins 123 the heating unit 120 to feed, as in the in 4 illustrated embodiment. In addition, the plug offers 300 one or more connecting pins 302 , for example, by means of soldering with the conductor paths 361 to couple. The thermally conductive plate 340 is preferably by means of the plug 300 via an appropriate connection 301 grounded, as in the 4 illustrated embodiment. Alternatively, grounding can be achieved by connecting an upper extension 345 the conductive plate to earth, with a plug 300 with connecting pins 302 is provided at the bottom, with the ladder paths 361 and a ground connection to the side of the plug 300 , The compact design in turn offers advantages during assembly of the heating system component 100 within a parent component in which the heating system component 100 is integrated. With a single plug 301 for connecting the heating unit 120 and the one or more temperature sensors 370 reduces the complexity during assembly, as well as the required material costs.

6a schematically shows another embodiment in which one or more temperature sensors 470 on an inner peripheral portion of the carrier unit 110 are provided, wherein the carrier unit 110 an undercut section 400 comprising, by means of injection molding with a thermoplastic layer 500 is filled to form the base for a so-called molded interconnect device (MID). In a first step, the undercut section 400 created with a microstructure by a thin laser beam. The thermoplastic layer is provided on top of the microstructured surface of the metal layer. The metal layer is heated by means of another laser beam, while the thermoplastic layer is pressed on the surface of the microstructure to create a hybrid metal-plastic compound. The thermoplastic layer 500 is doped with a metal-plastic additive that can be activated by exposure to a laser beam. This process is commonly referred to as metallization, where two different sections are metallized, one for the temperature sensors 470 , eg NTC thermistors, and the other for the conductor paths 461 , The NTC thermistors 460 and corresponding conductor paths 461 are cut free with a laser. Also in this embodiment is a positive plug 600 provided, the connecting pins 602 for connecting to the respective conductor paths 461 having. The housing of the plug 600 is preferably made of a transparent plastic material that is compatible with the thermoplastic layer 500 may be welded, which should therefore preferably be made of thermoplastic material that absorbs the energy of a laser beam, previously the housing of the transparent connector 600 has happened without introducing significant amounts of energy into the plastic material and thus deforming it. The form-fitting design by this Embodiment is provided, facilitates the assembly of the heating system component 100 in a parent system, and also reduces the size and material costs needed to implement a temperature sensor 460 for the heating system component 100 required are.

7 schematically shows a further embodiment in which one or more temperature sensors, in particular NTC thermistors 770 , as well as the ladder paths 761 between the one or more NTC thermistors 770 and an external plug on a thin layer 760 are formed, preferably a thin polymer film, before the film on the carrier unit 110 is attached. The NTC thermistors 770 as well as the ladder paths 761 can be formed either by printing, by vapor deposition or by metallization. The sensor foil is preferably with a suitable plug 600 preassembled, the conductor pins to the conductor paths and preferably also provides power connections for the heating unit and a pin for grounding the carrier unit. The plug 600 can then contact the carrier unit 710 be mounted by welding, in particular spot welding the power connections 302 and a ground connection 301 at the heating unit 120 or the carrier unit 710 , The thin foil 760 is then on the carrier unit 710 by adhering at least a portion of the underside of the film 760 on the dry side of the carrier unit 110 attached using a heat-resistant adhesive. The NTC thermistors are preferably on a portion of the dry side of the carrier unit 110 arranged whose wet side is in contact with the fluid circulating on the wet side. The embodiment allows a particularly flexible way of arranging the temperature sensors at a desired location of the carrier unit. Further, the embodiment provides a very compact design without any protrusions or cables that take up space and attention during assembly.

An exemplary application of the invention relates generally to situations in which a fluid medium must be heated in an efficient manner, e.g. in home appliances such as dishwashers, dryers and washing machines, small electrical appliances such as coffee makers, irons, steam generators and the like, or in water heaters. Other variations of the disclosed embodiments may be understood and made by those skilled in the art upon studying the drawings, the disclosure, and the appended claims when practicing the claimed invention.

In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality.

A single unit or device may fulfill the functions of several elements mentioned in the claims. The mere fact that certain features are mentioned in mutually different dependent claims does not indicate that a combination of these features can not be used to advantage.

Investigations such as measuring a temperature performed by one or more units or devices may be performed by any other number of units or devices. For example, measuring a temperature may be performed by a single temperature sensor or any other number of different units. The determination and / or control of the heating system for heating fluid media may be implemented as program code means of a computer program and / or as dedicated hardware.

A computer program may be stored / distributed by means of a suitable medium, e.g. However, an optical storage medium or a solid state medium which is supplied together with or as part of other hardware may also be distributed in other forms, e.g. over the Internet or wired or wireless telecommunications systems. The term "computer program" may also refer to embedded software.

All references in the claims are not to be construed as limiting the scope.

LIST OF REFERENCE NUMBERS

100

heating system component

101

wet side

102

dry side

110

support unit

111

circular hole

112

deepening

113

peripheral portion

120

heating unit

122

thermally conductive paste

123

Heating unit connecting pins

140, 240, 340

thermally conductive plate

141, 241, 341

protruding part

142

detached section

143

grooves

144, 244

unreleasured section

170, 180, 270, 370, 460, 470

temperature sensor

170a, 180a, 270a, 370a

first temperature sensor

170b, 180b, 270b, 370b

second temperature sensor

181

shielding unit

182

hollow

250a

first ceramic block

250b

second ceramic block

260, 360, 760

insulating

261, 361, 461, 761

conductive paths

300.600

plug

301

connection

302, 602

connecting pins

345

upper extension

400

undercut portion

500

thermoplastic layer

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

• US 2006/0236999 A1 [0004]

Claims (4)

A heating system component (100) for a heating system for heating a fluid medium, the heating system component (100) comprising: a support unit (110); a heating unit (120) coupled to the carrier unit (110); wherein the carrier unit (110) has a wet side and a dry side, the wet side of a surface corresponding to the carrier unit (110) configured to be in contact with the fluid medium, the dry side being on one of the wet side arranged opposite surface; and wherein the heating unit (120) is accommodated in a recess (112) provided on the dry side of the carrier unit (110) and at least one temperature sensor (180a, 180b), in particular an NTC thermistor, the temperature sensor (180a , 180b) is in effective thermal contact with at least a portion of a dry surface upper surface of the support unit (110), the upper side portion of the support unit (110) contacting the fluid medium at the wet side, and wherein the portion the upper side of the carrier unit (110) is effectively thermally insulated from the heating unit (120); characterized in that the temperature sensor (180a, 180b) within the recess (112) of the carrier unit (110) by means of a shielding unit (181) of the heating unit (120) is provided shielded. Heating system component (100) according to Claim 1 wherein the shielding unit (181) is made of stainless steel or alumina. Heating system component (100) according to Claim 1 or 2 further comprising a second temperature sensor (180b) shielded within the recess (112) by a shielding unit (181) from the heating unit (120), the resulting temperature being derived from an average temperature different from the first (180a ) and the second (180b) temperature sensor. Heating system component (100) according to Claim 3 wherein the first (180a) and second (180b) temperature sensors are NTC thermistor pellets potted between the dry side of the carrier unit (110) and the shield unit (181) in epoxy resin.

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