NL1041116B1

NL1041116B1 - Device and method for monitoring of a kitchen stove.

Info

Publication number: NL1041116B1
Application number: NL1041116A
Authority: NL
Inventors: Hieronymus Schalkwijk Msc Frank; Gideon Tersmette Llm Bsc Derek
Original assignee: Hieronymus Schalkwijk Msc Frank; Gideon Tersmette Llm Bsc Derek
Priority date: 2014-12-19
Filing date: 2014-12-19
Publication date: 2016-10-11

Abstract

A device for monitoring of a kitchen stove, the device comprising a presence sensor arranged for detecting a motion and/or a presence of a person in a first range of the device, a heat sensor arranged for measuring a first temperature (T_1) in a second range of the device, a timer unit arranged for measuring the total time that has passed since the last event was detected (t_ne), a calculation unit arranged for calculating a first temperature change (dT_1) comprising subtracting a reference temperature (T_ref) from T_1 and an alerting unit arranged for producing an alert if t_ne exceeds a first delay (t_delay1) and the dT_1 change exceeds a predetermined first temperature change value (dT_value1). The alerting unit is further arranged for changing the characteristics of the heat alert in dependence of the duration of t_ne.

Description

DEVICE AND METHOD FOR MONITORING OF A KITCHEN STOVE TECHNICAL FIELD

The present invention relates to a safety device for a kitchen stove, or for any other device which could be dangerous if in operation and left unattended for a predetermined period.

BACKGROUND

Gas stoves, electric stoves and ovens are examples of heating appliances widely used in today's society and each year there are a number of fires which occur as a result of stoves or ovens being left on at an overly high temperature. Often these fires result from the negligence of the building occupant in turning on a stove and subsequently forgetting that it is on. As a result, materials like oils can catch fire and result in considerable loss of property and even life. Obviously, it would be desirable to incorporate a safety device with a stove top or oven to prevent such occurrences.

Current solutions focus on an active interference in the operation of the stove. When it is detected that a stove is heating above a certain level, and there is no presence or motion of a person in an area around the stove, the power is reduced or the gas is turned off.

Examples of such solution are described below. US Patent 5,717,188 by Vaillancourt proposes a safety device for electric stoves and ovens wherein there is provided a sensor for sensing when the stove is heating at a certain rate which could constitute a safety hazard and a sensing means for detecting the presence of a person within a predetermined area proximate the stove. When a certain period of time passes without motion by a person in the predetermined area while the stove is in the predetermined operating condition, power to the stove can be reduced. US Patent 4,775,913 by Ekblad proposes a control device for controlling the operation of an object of cooking such as a stove or the like. The presence of a user in the area of the stove is detected. When the user is present, the stove operation is enabled. After the user has been absent from the area for a first predetermined time, the stove is temporarily disabled, an again enabled when the user enters the area. If the user is absent from the area of the stove for a second predetermined time, the stove is permanently disabled, so that it cannot again be enabled until manually reset. A disadvantage of current solutions is that there has to be a connection of the control or safety device to the operation of the stove, which is complicated and expensive. The solutions are moreover often specially adapted to the type of stove and therefore in a limited amount available for most of the stoves on the market.

DISCLOSURE OF INVENTION

It is an object of the invention to provide a stand-alone generic device for monitoring a kitchen stove. It is a further object of the invention to provide an after-market device for this purpose, which may be built in or on a kitchen element. It is a further object to improve the safety of cooking in a relatively inexpensive and reliable manner.

BRIEF DESCRIPTION OF THE DRAWINGS

The figures show views of embodiments in accordance with the present invention. FIGURE 1 shows an embodiment of the inventive method. FIGURE 2 shows an embodiment of the inventive method wherein an alert escalation protocol is incorporated.

DETAILED DESCRIPTION

The invention is now described by the following aspects and embodiments, with reference to the figures. FIGURE 1 shows an embodiment of the inventive method

Hereinafter every step in the depicted flow chart is explained. The indication in the boxes and diamonds are abbreviations and are presented for facilitating the reading of the flowchart. The indications do not cover the step entirely. In the steps mentioned below the temperature sensor is arranged for measuring temperature of a kitchen stove, whereas the presence sensor is arranged for detecting a presence and/or movement of an object in the vicinity of the stove.

The following abbreviations are used: T_1 : first measured temperature dT_1 : first temperature change T_ref : reference temperature dTvaluel ...n : predetermined first...n temperature change value t_ne : total time that has passed since the last event was detected. t_delay1...n : predetermined delay after first...n measured heat increase exceeding dT_value1..n 101 Start routine. 102 Arming a presence sensor for detecting an event comprising a motion and/or a presence of a person in a first range of the device. 103 Detecting a presence by the presence sensor. 104 If a presence is detected then go to step 105, else go back to step 103. 105 Arming a heat sensor for measuring a first temperature (T_1) in a second range of the device. 106 Measuring by the armed heat sensor a reference temperature (T_ref). 107 Measuring by a timer unit the total time that has passed since the last event was detected (dt_ne), 108 Calculating by a calculation unit a first temperature change (dT_1), the calculation comprising subtracting T_ref from T_1. If dT_1 exceeds a predetermined temperature change value (dT_value1) then go to step 109, else go back to step 107. 109 If a presence is detected then go to step 112, else go to step 110. 110 If dt-ne exceeds a predetermined first delay (dt_delay1) the go to step 111, else go back to step 109. 111 Produce a heat alert by an alerting unit of the device, wherein the characteristics of the heat alert change in dependence of the duration of t_ne. 112 End of the method. The method may be proceeded in further exemplary methods and/or routines or may start again at any point. FIGURE 2 shows an embodiment of the inventive method wherein an alert escalation protocol is incorporated. Depending on the duration of the absence of a person the alerting characteristics change. The intensity or duration of an alert may increase for example. Hereinafter every step in the depicted flow chart is explained. The indication in the boxes and diamonds are abbreviations and are presented for facilitating the reading of the flowchart. The indications do not cover the step entirely.

In the steps mentioned below the temperature sensor is arranged for measuring temperature of a kitchen stove, whereas the presence sensor is arranged for detecting a presence and/or movement of an object in the vicinity of the stove. The named routines are explained further below.

It should be noted that the length of delays and timers such as at step 204, which states “Wait 2 seconds” are merely indicative and given as an example. 201 Start routine. 202 Start routine “Battery measurement”. 203 Start routine “Detecting presence”. 204 Wait 2 seconds. 205 Check if presence is detected by the presence sensor. If yes: go to step 206. If no: go back to step 204. 206 Arm a temperature (T) sensor. 207 Measure reference temperature (T-ref) with the temperature sensor and store T-ref in memory. 208 Start routine “Timer start/reset”. 209 Start routine “Temperature measurement”. 210 Check if the temperature, as measured by the temperature sensor, has increased by at least 0,5 degrees Celsius in comparison with T-ref. If yes: go to step 211. If no: go back to step 204. 211 Start routine “Cooling down”. 212 Reset timer to zero (t=0). 213 Check if presence is detected by the presence sensor. If yes: go to step 212. If no: go to step 214. 214 Check if timer is at least 10 minutes. If yes: go to step 215. If no: go back to step 213. 215 Produce a short alert. 216 Check if presence is detected by the presence sensor. If yes: go back to step 212. If no: go to step 217. 217 Check if timer is at least 20 minutes. If yes: go to step 218. If no: go back to step 216. 218 Check if the temperature has dropped according to the 3 latest measurements by the temperature sensor. If yes: go to step 220. If no: go to step 219. 219 Produce a long alert. 220 Produce a short alert. 221 Check if presence is detected by the presence sensor. If yes: Go to step 222. If no: go to step 223. 222 Set alert off and go back to step 212. 223 Check if timer is at least 30 minutes. If yes: go to step 225. If no: go to step 224. 224 Check if presence is detected by the presence sensor. If yes: go to step 212. If no: go to step 223. 225 Check if the temperature has dropped according to the 3 latest measurements by the temperature sensor. If yes: go to step 227. If no: go to step 226. 226 Produce continuous alert. Go to step 228. 227 Produce short alert. 228 Check if presence is detected by the presence sensor. If yes: go to step 222. If no: go to step 229. 229 Wait 10 minutes. Go to step 225.

The following steps are part of the routine “Battery measurement”. 301 Start routine. 302 Measure battery status (charge level). 304 Wait for 10 minutes. 305 If the battery level is at least 5 percent go to step 304. If battery level is below 5 percent go back to 302. 306 Produce alert for 0,1 second. 307 Wait for 1 minute. Go to step 304.

The following steps are part of the routine “Detecting presence” 401 Start routine. 402 Detect presence during 1 second. 403 Wait 2 seconds. Go to step 402.

The following steps are part of the routine “Timer start/reset”” 501 Start routine. 502 Start or reset timer to zero (t=0). 503 Check if presence is detected by the presence sensor before timer=3 minutes. If yes: go back to step 503. If no: go to step 209.

The following steps are part of the routine “Cooling down” 601 Start routine. 602 Wait 10 seconds. 603 If Temperature has decreased below the threshold of T ref + 0,5 C, then go to step 604, else go back to step 602. 604 Wait 10 seconds. 605 If temperature has increased go back to step 603, else go to step 606. 606 Stop all routines and start at step 201.

The invention is summarized in a first aspect as a device for monitoring of a kitchen stove, the device comprising: - a presence sensor arranged for detecting an event comprising a motion and/or a presence of a person in a first range of the device; - a heat sensor arranged for measuring a first temperature (T_1) in a second range of the device, - a timer unit arranged for measuring the total time that has passed since the last event was detected (t_ne), wherein the device further comprises: - a calculation unit arranged for calculating a first temperature change (dT_1) comprising subtracting a reference temperature (T ref) from T_1. - an alerting unit arranged for producing an alert if t_ne exceeds a first delay (t_delay1) and the dT_1 change exceeds a predetermined first temperature change value (dT_value1); - the alerting unit further arranged for changing the characteristics of the heat alert in dependence of the duration of t_ne.

The first aspect has following embodiments: A control unit may be arranged for arming the presence sensor and for arming the heat sensor when the presence sensor detects an event. T_ref may comprise a temperature measured by the heat sensor right after the arming of the heat sensor.

The device may further comprise a memory unit arranged for storing T_ref.

The control unit may arm the presence sensor when the temperature change exceeds a second temperature change value (dT_value2).

The alerting unit may further be arranged for producing an alert when a temperature change exceeds a predetermined third temperature change value (dT_value3) and t_ne exceeds a second delay (t_delay2).

This is for detection of for example a pan catching fire. In that case an immediate alert is desirable.

The device may further comprise a gas detector arranged for detecting the presence of gas within a third range of the device, and wherein the alerting unit is further arranged for producing an alert when: - the gas detector detects the presence of gas and - the gas detector detects a presence of the temperature substantially equals T_ref and - t_ne exceeds a third delay (t_delay3).

If for example a user turns on the gas, but the gas is not ignited for any reason, whilst the user thinks that the gas is ignited, it is desirable that an alert is produced without too much delay. The gas detected may be carbon dioxide or carbon monoxide or other dangerous gasses.

The control unit may further be arranged for arming the gas detector when the presence sensor detects an event.

The alert may comprise an alert of the group of alerts comprising: - an audible alert; - a visual alert, such as a flashing light; - an emergency call, such as a call to an emergency centre.

The characteristics of the heat alert may comprise characteristics of the group comprising: - intensity; - volume; - brightness; - modulation; - frequency.

The device may be operating autonomously.

The device may be arranged for being mounted under a kitchen hood.

The device may further comprise batteries arranged for supplying power for the operation of the device. A second aspect of the invention is described as a method for monitoring of a kitchen stove, the method comprising the steps of: - arming a presence sensor for detecting an event comprising a motion and/or a presence of a person in a first range of the device; - arming a heat sensor for measuring a first temperature (T_1) in a second range of the device; - measuring by a timer unit the total time that has passed since the last event was detected (dt_ne), wherein the method further comprises the steps of: - measuring by the armed heat sensor a reference temperature (T_ref); - calculating by a calculation unit a first temperature change (dT_1), the calculation comprising subtracting T ref from T_1; - producing a heat alert by an alerting unit of the device, if dt-ne exceeds a predetermined first delay (dt delayl) and dT_1 exceeds a predetermined temperature change value (dT valuel), wherein the characteristics of the heat alert change in dependence of the duration of t_ne.

The second aspect may comprise the following embodiments.

The method may comprise that the heat sensor is armed after the presence sensor detects the event.

The method may comprise the steps of: measuring a battery level by the device; producing a battery alert if the battery level is below a threshold.

This step may be comprised in the routine “Battery measurement”.

The step of arming the presence sensor may comprise activating the presence sensor with intervals.

This step may be comprised in the routine “Detecting presence”.

After measuring T ref, the method may comprise the following steps: A timer starts.

If subsequently a presence is detected by the presence sensor within a predetermined period the timer is reset to zero.

If subsequently no presence is detected by the presence sensor within a predetermined period, T_1 is measured.

This step may be comprised in the routine “Detecting presence”.

The step of calculating the first temperature change may comprise a verification step, the verification step comprising the following steps after calculating dT_1: calculating by the calculation unit a temperature drop dT_2;

If the dropped temperature no longer exceeds dT_value1, the method restarts from the start.

This step may be comprised in the “cooling down” routine.

The characteristics may comprise any one or a combination of the group of characteristics comprising: duration of the heat alert; number of repetitions of multiple heat alerts; duration of the intervals between a sequence of audible and/or visual heat alerts; duration of the audible and/or visual heat alert; volume and/or pitch of the audible heat alert; modulation of the heat alert; light intensity and/or color of the visual heat alert; the wording and/or tone of a preprogrammed voice supported heat alert.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The term "and/or" includes any and all combinations of one or more of the associated listed items. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The article "the" preceding an element does not exclude the presence of a plurality of such elements. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. Een toestel voor het monitoren van een fornuis, het toestel omvattende: - een aanwezigheidssensor ingericht voor het detecteren van een gebeurtenis omvattende een beweging en/of een aanwezigheid van een persoon in een eerste bereik van het toestel; - een warmtesensor ingericht voor het meten van een eerste temperatuur (T_1) in een tweede bereik van het toestel; - een timereenheid ingericht voor het meten van de totale tijd die is verstreken sinds de laatste gebeurtenis werd gedetecteerd (f_ne) met het kenmerk dat, het toestel verder omvat: - een rekeneenheid ingericht voor het berekenen van een eerste temperatuurverandering (dT_1) omvattende het aftrekken van een referentie temperatuur (T_ref) van T_1; - een alerteringseenheid ingericht voor het produceren van een warmtealert als t_ne een eerste vertraging (t_delay1) overschrijdt en de dT_1 verandering een vooringestelde eerste temperatuurverandering waarde overschrijdt; - de alerteringseenheid voorts is ingericht voor het veranderen van de eigenschappen van het warmtealert afhankelijk van de duur van t_ne.A device for monitoring a stove, the device comprising: - a presence sensor adapted to detect an event comprising a movement and / or a presence of a person in a first range of the device; - a heat sensor adapted to measure a first temperature (T_1) in a second range of the device; - a timer unit adapted to measure the total time that has elapsed since the last event was detected (f_ne), characterized in that the device further comprises: - a calculation unit adapted to calculate a first temperature change (dT_1) comprising subtracting of a reference temperature (T_ref) of T_1; - an alerting unit adapted to produce a heat alert when t_ne exceeds a first delay (t_delay1) and the dT_1 change exceeds a preset first temperature change value; - the alerting unit is further adapted to change the properties of the heat alarm depending on the duration of tne.

2. Het toestel volgens conclusie 1, met het kenmerk dat een controle-eenheid is ingericht voor het wapenen van de aanwezigheidssensor en voor het wapenen van de warmtesensor als de aanwezigheidssensor een gebeurtenis detecteert.The device according to claim 1, characterized in that a control unit is arranged for reinforcing the presence sensor and for reinforcing the heat sensor if the presence sensor detects an event.

3. Het toestel volgens conclusie 1 of 2, met het kenmerk dat T_ref een temperatuur omvat gemeten door de warmtesensor direct na het wapenen van de warmtesensor.The device according to claim 1 or 2, characterized in that T_ref comprises a temperature measured by the heat sensor immediately after reinforcing the heat sensor.

4. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat het toestel voorts een geheugeneenheid omvat ingericht voor het opslaan van T-ref.The device according to any of the preceding claims, characterized in that the device further comprises a memory unit adapted to store T-ref.

5. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat de controle-eenheid de aanwezigheidssensor wapent als de temperatuurverandering een tweede temperatuurverandering waarde (dT_value2) overschrijdt.The device according to any of the preceding claims, characterized in that the control unit arms the presence sensor if the temperature change exceeds a second temperature change value (dT_value2).

6. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat de alerteringseenheid voorts is ingericht voor het produceren van een warmtealert als een temperatuurverandering een vooringestelde derde temperatuurverandering waarde (dT_value3) overschrijdt en tjne een tweede vertraging (t_delay2) overschrijdt.The device according to any of the preceding claims, characterized in that the alerting unit is further adapted to produce a heat alert if a temperature change exceeds a preset third temperature change value (dT_value3) and tjne exceeds a second delay (t_delay2).

7. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat het toestel voorts een gasdetector omvat ingericht voor het detecteren van de aanwezigheid van gas binnen een derde bereik van het toestel, en waarbij de alerteringseenheid voorts is ingericht voor het produceren van een warmtealert als: - de gasdetector de aanwezigheid van gas detecteert en - de gasdetector een aanwezigheid van de temperatuur detecteert die substantieel gelijk is aan T-ref en - t_ne een derde vertraging (t_delay3) overschrijdt.The device according to any of the preceding claims, characterized in that the device further comprises a gas detector adapted to detect the presence of gas within a third range of the device, and wherein the alerting unit is further adapted to produce a heat alarm if: - the gas detector detects the presence of gas and - the gas detector detects a presence of the temperature that is substantially equal to T-ref and - t_ne exceeds a third delay (t_delay3).

8. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat de controle-eenheid voorts is ingericht voor het wapenen van de gasdetector als de aanwezigheidssensor een gebeurtenis detecteert.The device according to any one of the preceding claims, characterized in that the control unit is further adapted to arm the gas detector when the presence sensor detects an event.

9. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat het warmtealert een alert omvat van de groep van alerten omvattende: - een hoorbaar alert; - een visueel alert, zoals een flitsend licht; - een noodoproep, zoals een oproep naar een alarmcentrale.The device according to any one of the preceding claims, characterized in that the heat alert comprises an alert from the group of alerts comprising: - an audible alert; - a visual alert, such as a flashing light; - an emergency call, such as a call to an emergency center.

10. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat het toestel autonoom werkt.The device according to any one of the preceding claims, characterized in that the device operates autonomously.

11. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat het toestel is ingericht om te worden geplaatst onder de afzuigkap.The device according to any one of the preceding claims, characterized in that the device is adapted to be placed under the extractor hood.

12. Het toestel volgens één der voorgaande conclusies, met het kenmerk dat het toestel voorts batterijen omvat ingericht voor de stroomvoorziening voor het laten werken van het toestel.The device according to any one of the preceding claims, characterized in that the device further comprises batteries arranged for the power supply for operating the device.

13. Een methode voor het monitoren van een fornuis, de methode de volgende stappen omvattende: - wapenen van een aanwezigheidssensor voor het detecteren van een gebeurtenis omvattende een beweging en/of een aanwezigheid van een persoon in een eerste bereik van het toestel; - wapenen van een warmtesensor voor het meten van een eerste temperatuur (T_7) in een tweede bereik van het toestel; - meten door een timereenheid van de totale tijd die is verstreken sinds de laatste gebeurtenis werd gedetecteerd (dt_ne), met het kenmerk dat, de methode voorts de volgende stappen omvat: - meten van een referentietemperatuur (Tjref) door de gewapende warmtesensor; - berekenen van een eerste temperatuurverandering (dT_1) door een rekeneenheid, het berekenen omvattende het aftrekken van Tjref van 7_7; - produceren van een warmtealert door een alerteringseenheid van het toestel, als dt_ne een vooringestelde vertraging (dT_value1) overschrijdt en dT_1 een vooringestelde temperatuurverandering waarde overschrijdt, waarbij de eigenschappen van het warmtealert veranderen afhankelijk van de duur van t_ne.A method for monitoring a stove, the method comprising the steps of: - reinforcing a presence sensor for detecting an event comprising a movement and / or the presence of a person in a first range of the device; - reinforcing a heat sensor for measuring a first temperature (T_7) in a second range of the device; - measuring by a timer unit the total time that has elapsed since the last event was detected (dt_ne), characterized in that the method further comprises the following steps: - measuring a reference temperature (Tjref) by the armed heat sensor; - calculating a first temperature change (dT_1) by a calculation unit, the calculation comprising subtracting Tjref from 7_7; - producing a heat alarm by an alarm unit of the device if dt_ne exceeds a preset delay (dT_value1) and dT_1 exceeds a preset temperature change value, the properties of the heat alert changing depending on the duration of t_ne.

14. De methode volgens conclusie 13, met het kenmerk dat de methode omvat dat de warmtesensor wordt gewapend nadat de aanwezigheidssensor een gebeurtenis detecteert.The method according to claim 13, characterized in that the method comprises that the heat sensor is armed after the presence sensor detects an event.

15. De methode volgens één der conclusies 13-14, met het kenmerk dat de methode de volgende stappen omvat: - meten van een batterijniveau door het toestel; - produceren van een batterijalert als het batterijniveau beneden een grenswaarde is.The method according to any one of claims 13-14, characterized in that the method comprises the following steps: - measuring a battery level by the device; - producing a battery alert if the battery level is below a limit value.

16. De methode volgens één der conclusies 13-15, met het kenmerk dat de stap van wapenen van de aanwezigheidssensor het met intervals activeren van de aanwezigheidssensor omvat.The method according to any of claims 13-15, characterized in that the step of reinforcing the presence sensor comprises activating the presence sensor at intervals.

17. De methode volgens één der conclusies 13-16, met het kenmerk dat na het meten van T-ref de methode de volgende stappen omvat: - een timer start; - als vervolgens een aanwezigheid wordt gedetecteerd door de aanwezigheidssensor binnen een vooringestelde periode, wordt de timer op nul gereset; - als vervolgens geen aanwezigheid wordt gedetecteerd door de aanwezigheidssensor binnen een vooringestelde periode, wordt T_1 gemeten.The method according to any of claims 13-16, characterized in that after measuring T-ref the method comprises the following steps: - a timer starts; - if subsequently a presence is detected by the presence sensor within a preset period, the timer is reset to zero; - if no presence is subsequently detected by the presence sensor within a preset period, T_1 is measured.

18. De methode volgens één der conclusies 13-17, met het kenmerk dat de stap van berekenen van de eerste temperatuurverandering een verificatiestap omvat, de verificatiestap omvattende de volgende stappen na het berekenen van dT_1: - berekenen door de rekeneenheid van een temperatuurdaling d72; - als de temperatuurdaling niet langer dT_value1 overschrijdt, herstart de methode vanaf de start.The method according to any of claims 13-17, characterized in that the step of calculating the first temperature change comprises a verification step, the verification step comprising the following steps after calculating dT_1: - calculating by the calculating unit a temperature drop d72; - if the temperature drop no longer exceeds dT_value1, the method restarts from the start.

19. De methode volgens één der conclusies 13-18, met het kenmerk dat de eigenschappen één of een combinatie van de groep van eigenschappen omvat, omvattende: - duur van het warmtealert; - aantal herhalingen van meerdere warmtealerten; - duur van de intervallen tussen een sequentie van hoorbare en/of visuele warmtealerten; - duur van het hoorbare en/of visuele warmtealert; - volume en/of toonhoogte van het hoorbare warmtealert; - modulatie van het warmtealert; - lichtintensiteit en/of kleur van het visuele warmtealert; - woordgebruik en/of intonatie van een voorgeprogrammeerd stem ondersteund warmtealert.The method according to any one of claims 13-18, characterized in that the properties comprise one or a combination of the group of properties, comprising: - duration of the heat alert; - number of repetitions of several heat zones; - duration of the intervals between a sequence of audible and / or visual heat alerts; - duration of the audible and / or visual heat alert; - volume and / or pitch of the audible heat alert; - modulation of the heat alert; - light intensity and / or color of the visual heat alert; - use of words and / or intonation of a pre-programmed voice supported heat alert.