Measurement methods, control systems and procedures for controlling infrared heaters

Abstract

A measurement method for determining the radiation properties of a heat source is provided, wherein said measurement method comprises the following steps: arranging a heat source with a vertical orientation along its main extent or in a position angled with respect to the vertical; providing an irradiable test object with a longitudinal axis and / or at least a central axis, wherein a test object surface facing the heat source has a predetermined emissivity and is arranged at a predetermined distance from the heat source; attaching at least one temperature sensor for determining at least one surface temperature on the test object surface facing the heat source and / or at least one radiation temperature; and / or providing a temperature sensor spaced from the test object for measuring an air temperature and / or at least one radiation temperature;Emitting radiation to achieve a predetermined control temperature range of a predetermined surface of the heating source; recording the heating source temperature distribution of the predetermined surface using the spaced-away temperature sensor or another temperature sensor; analyzing the recorded measurement data to assign the predetermined control temperature range of the heating source and the air temperature to the surface temperature of the test object and / or to at least one radiation temperature. Furthermore, a system and method for controlling at least one heating source are provided.

Description

[0001] The invention relates to measuring methods for detecting radiation properties of at least one heating source, a system for controlling at least one heating source that emits radiation in the infrared range, and a method for controlling one or more infrared heating sources for optimal control of room temperature. Technological background

[0002] Infrared heating sources can be powered by various energy sources, such as fossil fuels, renewable raw materials like wood, or electricity. Unlike traditional wood-burning stoves, electrically operated infrared heaters have the advantage of being flexibly positioned within rooms where a power supply is available. Infrared heating sources are generally characterized by a high radiant efficiency. Radiant efficiency indicates how much of the supplied electrical power is effectively emitted as infrared radiation from the surface of the module. This means a relatively high proportion of radiant heat compared to convective heat emission.

[0003] According to the International Electrotechnical Commission (IEC) standard DIN EN 60675-3 for direct electric heating appliances, an infrared heater must have a radiant efficiency of at least 40% to be classified as an infrared heater. Above this minimum value, the heat output transferred by infrared radiation predominates compared to other heat transfer methods such as convection, with the primary heat being transferred to the air rather than to objects and walls in the room.

[0004] In conventional electric infrared heaters, the front of the module is heated to typically over 65°C, preferably 80-120°C (sometimes up to 200°C), via a wire or heating foil, causing it to emit long-wave infrared radiation into the room. Current technology assumes a radiation cone with an opening angle of approximately 120° and a maximum radiation intensity of 70% to nearly 80%. The operating mode is regulated only between "Off" (0% power) and "On" (100% power). Reducing the power output is not recommended for efficiency reasons, as the heating element is designed for a specific power level and a reduction would result in insufficient energy being delivered to the front.The surface temperature of the heating module is therefore not linearly dependent on the electrical power and can lead to higher inefficiencies in the conversion of electrical power into heating power if the power is throttled.

[0005] For this reason, infrared heaters are almost always operated manually, controlled via a plug-in thermostat, or switched on and off via wireless thermostats. With conventional thermostats, the room air temperature is used as a parameter to control the infrared heater. This can lead to significant control errors with a heating system that emits a high proportion of radiant heat.

[0006] There are already many guidelines on how to install infrared heaters in a room, such as not opposite windows, but the location of the thermostat has been neglected so far. When using plug-in thermostats, for example, the thermostat is positioned below the module and therefore outside the radiation cone.

[0007] Infrared heating sources whose output cannot be continuously adjusted are often switched on and off via thermostats. Usually, surfaces are electrically heated, which in turn emits infrared radiation (IR radiation) and warms the surfaces they touch. Warm objects also emit IR radiation, which is why surfaces not in direct contact with the infrared source are also heated. Additionally, convection effects occur due to the air flowing past the heating surfaces, which rises towards the ceiling without any external influence.

[0008] The thermostats are usually installed directly between the socket and the heating module or via a wireless connection on a wall in the room.

[0009] Almost all commercially available models measure the room air temperature.

[0010] Because conventional thermostats only measure air temperature, they can only partially or not at all account for the radiant heat emitted by infrared heaters. Depending on the placement of the air temperature sensor, it may register a temperature that is too high or too low, even if the temperature in other parts of the room has already been exceeded or not yet reached. A plug-in thermostat placed next to or below the infrared heater is located outside the radiation cone of almost every infrared heater. This cone is determined by the infrared heater's radiation angle, which in most cases is a maximum of 120°. As a result, the plug-in thermostat only reacts once the room air has heated up to the floor, which is characteristic of convective heating and can lead to significant disadvantages when controlling radiant heaters.

[0011] Wireless thermostats also lack a standardized mounting location. There are no specifications regarding the distance and angle to the infrared heating source, nor the height above the floor at which they should be installed. Often, DIY enthusiasts mount them on the wall, who may lack the necessary expertise. However, even with expertise, it is impossible to optimally regulate and control an infrared heating source with these thermostats for the reasons mentioned above.

[0012] From DE 10 2016 123 536 A1, a heating system with several infrared heating devices for generating heat for at least one person staying in a room of a building is known, which has a control device for at least one heating device of the heating system and uses personal information from a detector installed in the room to generate heat specifically for the said person.

[0013] DE 196 02 085 A1 discloses a method for achieving a comfortable temperature in a room and an arrangement for carrying out the method. Furthermore, DE 10 2016 110 179 A1 describes a method for room heating using an electric surface heating device.

[0014] The object of the present invention is to overcome the disadvantages of the prior art. For example, one object of the present invention is to solve the problem of unsuitable thermostat positioning. Furthermore, both the room characteristics and the specific features of each infrared heater are to be taken into account, thereby enabling a control-regulated target variable to be kept optimally constant.

[0015] The problem with current technology is that manufacturers' specifications for the properties of infrared heaters are sometimes too imprecise for accurate control. For example, measurements of three infrared heaters from the same manufacturer under laboratory conditions clearly showed that the manufacturer's specifications can vary significantly from the measured values. The surface temperature measurements revealed that on the front of the plate-shaped infrared source, there are sometimes significant inhomogeneities in surface temperature at the edges, along the heating wire, and in between. This is exemplified by the [reference to the measurement in the original text]. Fig. Figure 1 illustrates the measured temperature distribution in degrees Celsius [°C]. Fig. Figure 1 shows the heating wire's path with higher temperatures and temperature decreases at the edges. Therefore, it is necessary to determine the actual temperature distribution more precisely, at least over a predetermined area of ​​the infrared heating source's surface.

[0016] The invention further aims to propose a system and measurement method that provides more accurate measurement data than previously known. This allows for the optimization of room design and, consequently, the selection of the type, number, and orientation of the heating sources. A further objective is to enable more precise control of one or more infrared sources based on the inventor's more accurate measurement method, depending on the zones of primary radiation. In other words, the measured characteristics of each individual heating module should be used to precisely determine the radiant output required to compensate for temperature differences between the prevailing room air temperature and the desired setpoint temperature. This allows for precise control of a selectable temperature, i.e., the setpoint temperature, for a room or room zone for the occupants.In the case of fluctuating air temperature or changing target temperature, the object of the invention is to intelligently and as precisely as possible adjust the radiant output of a heating source or the radiant outputs of several heating sources in order to achieve the respective target temperature. Furthermore, it is an object to optimally utilize infrared radiation energy so that energy costs can be reduced. Description of the invention: Measuring method

[0017] According to a first aspect, a measurement method for recording the radiation properties of a heat source is provided, whereby the aforementioned measurement method comprises the following steps: Arranging a heat source with a vertical orientation along its main extent or in a position angled with respect to the vertical in the range up to a maximum of 180°; Providing an irradiable test object with a longitudinal axis and / or at least one central axis, wherein a test object surface facing the heating source has a predetermined emissivity and is arranged at a predetermined distance from the heating source; Attaching at least one temperature sensor to detect at least one surface temperature on the test object surface facing the heat source and at least one radiation temperature; and / or providing a temperature sensor spaced apart from the test object to measure an air temperature and / or at least one radiation temperature, emitting infrared radiation to achieve a predetermined control temperature range of a predetermined surface of the heat source; detecting the heat source temperature distribution of the predetermined surface of the heat source using the spaced temperature sensor or another temperature sensor; Analysis of the recorded measurement data to assign the predetermined control temperature range of the heating source and / or the air temperature to the surface temperature of the test object and / or to at least one radiation temperature. In other words, for example, the predetermined control temperature range of the predetermined surface of the heating source is assigned to the surface temperature of the test surface (T (test object)) in order to provide pairs of values ​​T (heating source surface): T (test object).

[0018] In a preferred embodiment, the predetermined control temperature range can be a median value (T (median value of the heating source surface)) of the predetermined surface of the heating source.

[0019] Based on the fundamental principle of the measurement method developed by the inventor, a more precise measurement of the modules or heating sources is possible than with the prior art. For this purpose, a multiple temperature sensors are used, and a multitude of parameters are measured. Special and more precise sensors are employed for the more accurate measurement of the modules or heating sources; these differ, at least in part, from the temperature sensors typically used in the prior art for characterizing infrared heating sources.

[0020] With the aid of numerous temperature sensors, the air temperature in a room to be heated, as well as the radiant temperature and the actual temperature distribution on a predetermined surface of the infrared heating source, can be precisely determined. Furthermore, using the test object and the attached temperature sensor, the surface temperature of the test object's surface facing the heating source can be measured, preferably at various distances from the heating source. The combined measurement of the air temperature and radiant temperature yields the surface temperature of the test object. Since the test object was specifically developed by the inventor for these measurements, it is referred to as the "Brunner dummy," which can measure the surface temperature resulting from environmental influences precisely and with low latency using the attached temperature sensor.The measured surface temperature of the test object depends primarily on the distance of the test object from the heat source, as well as on the maximum radiant power of the heat source combined with the prevailing air temperature in the room. The variation in radiant power is not achieved by throttling the current, but rather by precisely timed on / off cycles.

[0021] The measurement method according to the invention advantageously investigates different scenarios in order to be able to draw conclusions about temperature states at different distances, at different air temperatures, as well as surface temperatures of the heating module or the heating source and reference points on one or more reference planes spaced apart from the heating source and deviating from the projected center.

[0022] The measurement method according to the invention can be advantageously used for a precise control model or method, which is described in more detail in a further section entitled "Control System." For a precise control method, the acquired measurement data and its analysis are necessary to determine the specific characteristics of the measured infrared heating sources. This measurement method can be applied to a variety of different types of infrared heating sources. Based on the precise measurement data, room design can be optimized, thereby influencing the choice of heating source type, number, and orientation. Furthermore, based on this developed measurement method, one or more infrared sources can be controlled more precisely, preferably depending on zones of primary radiation.

[0023] According to a further aspect of the invention, the measuring method is characterized in that the at least one temperature sensor designed to measure temperatures of the test object is selected from the group comprising: Temperature measuring probes, thermocouple wire, precision resistance sensors, PT100 and / or PT1000, an optical pyrometer or a thermal imaging camera, and / or a combination of these.

[0024] According to a preferred embodiment, the temperature sensor spaced away from the test object and / or a further temperature sensor designed to detect the temperature distribution on the heating source is an optical pyrometer or a thermal imaging camera with a suitable converging lens. Using a pyrometer positioned in the direct radiation field of the heating source, an averaged or median surface temperature of a predetermined surface of the heating source can be determined, which compensates for inhomogeneities common in prior art heating sources. Such a pyrometer can, among other things, be used in a system for controlling a heating source.

[0025] The temperature sensors mentioned, such as pyrometers, differ at least partially from the temperature sensors that are commonly used in the prior art to characterize infrared heating sources.

[0026] In a preferred aspect of the measurement method, the test object has a predetermined heat capacity and an emissivity of at least 70%, preferably 95%. Furthermore, a preferred embodiment of the test object is plate-shaped or rod-shaped and has a thickness between 10 mm and 200 mm, preferably between 30 mm and 100 mm. The measurement method also includes aligning a central axis and / or longitudinal axis of the test object parallel to the surface of the heat source.

[0027] For optimal measurement, the longitudinal axis and / or central axis of the Brunner dummy or test object is aligned so that the surface of the test object facing the heat source is parallel to the front of the heat source. This allows the maximum possible radiation flux to be measured. Due to this advantageous parallel alignment to a heating plate, it is not necessary to consider a viewing factor when calculating the actual radiation power.

[0028] In a further advantageous embodiment of the measurement method, it is provided that a test object or Brunner dummy is provided, which consists of an insulating material that has a layer on the surface facing the heat source that increases the emissivity to at least 70%.

[0029] The test objects are placed at predetermined or defined distances of, for example, 0.5 m in the direct radiation field of the infrared heating source according to the measurement method according to the invention and are measured at constant room temperatures in a possible range of 12 to 28 °C.

[0030] The test objects, or Brunner dummies, were specially designed by the inventor to measure air temperature while still being sensitive to radiation influences. These test objects, consisting largely of insulating material, can be constructed using standard insulation boards with a sufficient thickness of 10-200 mm. The insulating material can be, for example, wood fibers, rock wool, polystyrene, or other rigid foam compositions or combinations thereof.

[0031] According to an advantageous aspect of the measurement method, at least one sensor is attached to the test object using an adhesive film with an emissivity of at least 70%. In a preferred embodiment of the test object, the temperature sensor can be attached using masking tape with an emissivity of at least 90%.

[0032] The test objects or Brunner dummies are preferably coated on the front with a film, paint, varnish or other substance which has a high emissivity similar to human skin of preferably about 95%, but at least an emissivity of 70%.

[0033] A highly reflective film, paint, varnish or substance is applied to the back of each test object or Brunner dummy, which can reflect radiation well and has an emissivity of a maximum of 30%, ideally close to 0%.

[0034] As described above, a temperature sensor with sufficient accuracy is attached or glued to the side facing the heat source, ensuring minimal temperature deviations and a resolution of tenths or hundredths of a degree. This can be achieved with the aforementioned temperature sensors, such as thermocouple wires, PT100 sensors, or precision resistance sensors. These are attached using a thin adhesive film. The inventor discovered that standard masking tape is particularly well-suited for this purpose due to its high emissivity.

[0035] According to another aspect of the measurement method, measurements are carried out with the spaced temperature sensor or further temperature sensor in a reference plane which is arranged at a predetermined distance to the heat source in order to preferably record a thermal image, wherein these measurements are repeated at different distances to the heat source.

[0036] In this way, a thermal image of a reference plane can be captured at various distances using a thermal imaging camera or optical pyrometer and additionally validated with measurement points to measure the effective radiation angle and the temperature differences at distances from the projected center point on the reference plane. In one embodiment of the measurements, this can be achieved by arranging the preferably plate-shaped heat source parallel to a room wall or floor and measuring the thermal image of the wall or floor. These measurements are taken at various distances of, for example, 0.5 m (e.g., 0.5 m, 1 m, 1.5 m, 2 m, 2.5 m, 3 m, 3.5 m, 4 m) from the heat source surface to the selected reference plane, by positioning the heat source at the desired distance relative to the reference plane.Different surface materials, such as sheet metal, glass, or porcelain, and the homogeneity of the surface temperature exhibit individual characteristics in the thermal image. This measurement is also repeated with different angles of the heat source to the reference plane.

[0037] According to another aspect of the measurement procedure, the measurements are carried out at different room air temperatures, which range between 12°C and 28°C.

[0038] In this way, the temperature can be increased, for example, from 12°C in 0.5°C increments or 1°C increments, preferably to the following temperatures: 12°C, 13°C, 14°C, 15°C, 16°C, 16.5°C, 17°C, 17.5°C, 18°C, 18.5°C, 19°C, 19.5°C, 20°C, 20.5°C, 21°C, 21.5°C, 22°C, 22.5°C, 23°C, 23.5°C, 24°C, 24.5°C, 25°C, 25.5°C, 26°C, 26.5°C, 27°C, 27.5°C, 28°C. If measurements are repeated several times under isothermal conditions of the air temperature of the room to be measured, error values ​​or deviations can be minimized or eliminated by statistical methods such as averaging.

[0039] According to a preferred embodiment, each measured air temperature can be assigned to a predetermined control temperature range of the heating source, wherein this predetermined value preferably corresponds to a median value of the predetermined surface area of ​​the heating source. Furthermore, switching times of the heating source can be assigned to the predetermined control temperature range of the heating source, so that value pairs T (°C heating source surface area): t ([s] switching times; on / off) can be provided to a database. The switching times are explained below.

[0040] According to the inventive method, the test objects are placed at defined intervals of, for example, 0.5 m (e.g., 0.5 m, 1 m, 1.5 m, 2 m, 2.5 m, 3 m, 3.5 m, 4 m) in the direct radiation field of the infrared heater and measured at the aforementioned constant room temperatures in a range of 12 to 28 °C. Different surface temperatures of the heating source are set. For this purpose, a temperature distribution of a predetermined surface of the heating source is measured using a spaced-apart temperature sensor, e.g., an optical pyrometer with a suitable converging lens. These measurements can compensate for the previously described inhomogeneities in the surface temperature of the heating source and can function as a controller within a system. For example, in the range between approximately...A socket relay is switched "on" and "off" relative to a desired median temperature of the heating source, within a range of + / - 2 K or up to + / - 25 K, preferably within + / - 5 K. This relay controls the operation of the infrared heating source. The duration of these states (on and off times or switching times t [s]) can then be used to infer the surface temperature of the heating module and thus determine the radiant power.

[0041] Additionally, an analysis is performed of the initial switch-on duration, which corresponds to the heating-up time. This determines the time the heating module needs to heat up from room or air temperature to the upper limit of the preferably median surface temperature of the heat source. This allows for a precise determination of how long the heat source or the respective module must be preheated for a multitude of heat sources. Together with a determination of how long the heat source must be switched "on" and "off" (i.e., t switching times in [s]) to achieve a constant median temperature, and the respective surface temperatures of the test object that will be reached at different intervals (value pairs T (median value of the heat source surface): T (test object at D=1, D=2, etc.), the radiant output of the heat source can be controlled via precisely timed switch-on and switch-off durations.

[0042] Based on these established fixed relationships between selected parameters, values ​​can be generated between the measured data using interpolation (linear or polynomial). Depending on the distance, the appropriate switch-on, switch-off, and heating durations can then be assigned to the surface temperatures of the test object. The dummy surface temperatures, air temperatures, and their corresponding switch-on, switch-off, and heating durations can be listed in a matrix and stored in a database for controlling the respective measured heating source.

[0043] Optionally, the measurement procedure can include the following further steps: Providing a multimeter to measure the current, voltage and / or electrical power of the heating source; and Determining the heating, switching on and off duration of the heating source for the respective control temperature range, which is selected from a plurality of temperature levels, preferably between 50°C and the maximum temperature of the heating source, wherein the heating source has a temperature within a range of ±2.5 K to ±5 K or more around the control temperature, by switching the heating source on and off at intervals using a relay, preferably with an interval of less than 15 minutes, preferably less than 3 minutes. Other time intervals are also conceivable, with shorter time intervals being preferred since the temperature fluctuations in the reference plane can be kept smaller than with longer time intervals.

[0044] If the heating source is connected to a multimeter, the current, voltage, and electrical power can also be determined. These heating source parameters (e.g., switching times or median surface temperature) can then be assigned to a target temperature (Ttarget) in a reference plane or to the surface temperature on the test object. This data can also be used to determine the on and off times.

[0045] The measurement procedure further includes the following steps, whereby the predetermined distance of the test object is varied and the respective surface temperature of the test object and / or radiation temperature is determined as a function of the distance and the control temperature range of the heating source.

[0046] To further increase the precision of the measurement results, the temperature on the test objects or Brunner dummies can be repeatedly measured at the selected intervals (D=0, D=1, D=2 etc.) and depending on the air temperature of the room and selected median surface temperatures of the heating source (T median surface temperature) in several measurement cycles in order to minimize errors due to temperature fluctuations or other disturbances.

[0047] Optionally, the measurement method can be characterized by varying the angular position of the heating source.

[0048] In this way, the heat source can be measured at various angles. Angles of the heat source can be measured from a horizontal orientation, for example on a ceiling (angled at 90° to the vertical), to a vertical orientation, such as on a wall, as well as any position in between.

[0049] The measuring method allows for the examination of different angles up to a maximum of 180°, preferably 45° or other arbitrary inclinations to the vertical, in relation to a reference plane, in order to replicate not only wall or ceiling mounting, but also positions between the common mounting types. System for controlling a heat source

[0050] According to a further aspect of the present invention, a system according to claim 10 for controlling at least one or more heating sources that emit or emit radiation in the infrared range is provided to heat a room, comprising: a control device designed to receive measurement data from an air temperature sensor; a storage unit for storing database data, and wherein the control device is configured to switch at least one heating source on or off using the database data and measurement data of the air temperature sensor in order to control a predetermined setpoint temperature on a reference plane.

[0051] With the aid of the control system according to the invention, the disadvantage of a heating source that its electrical power cannot be throttled or dimmed can be overcome. The database data is based at least partially on the results of the measurement methods according to the invention described above. In other words, the radiant power required to compensate for the difference between the prevailing room air temperature and the desired setpoint temperature can be precisely determined from the measured characteristics of each individual heating module or heating source. If the room air temperature is too low, the temperature difference can be compensated for with the additional radiant heat from the infrared heating source, and the system can be intelligently adjusted in the event of fluctuating air temperature or a changing setpoint temperature.

[0052] Advantageously, the database data is based at least partially on these measurement methods developed by the inventor, and the database data includes at least the following data: Measurement data of the room's air temperature, Measurement data of the surface temperatures of the heating source including control temperature values; Measurement data of the surface temperatures of the test objects, including target temperature values ​​on a reference plane; calculated data; Switch-on, switch-off and heating-up times; and combinations thereof.

[0053] Model-based data, derived from a control model, can be used for the precise control of the heat source. Unlike conventional heat sources, control is not achieved using known thermostats, but rather with the help of database data based on the results of the measurement method according to the invention.

[0054] With the aid of the control system according to the invention, a predetermined setpoint temperature for a reference plane at a selected distance to the respective heat source can be controlled.

[0055] Furthermore or alternatively, a relay can be provided for each heating source, which can receive control signals from the control device via cable or wirelessly to control a heating duration and / or on-time or off-time for one or more heating sources.

[0056] According to a preferred embodiment of the system according to the invention, the air temperature sensor is arranged in a reference plane at a predetermined distance from the respective heat source.

[0057] A single temperature sensor for measuring the room air temperature, positioned at a reference level, is sufficient to precisely control one or more heating sources. Regardless of the number of heating sources installed in the room, only one temperature sensor for the room air is required.

[0058] The database data is further selected from the group encompassing: Estimates determined by interpolation methods encompassing switch-on / switch-off or heating durations or temperature estimates between measurement data of different adjacent temperature values; Estimates determined by interpolation methods include consumption values ​​to determine the power output of the heat source; estimated temperatures on a reference plane calculated as a function of the distance of the reference plane to the heat source; estimated temperatures on a surface of a test object or dummy, calculated as a function of the distance to the heat source, wherein the test object preferably has a defined heat capacity and surface with a predetermined defined emissivity; Data calculated through statistical analyses of measurement data of the radiating surface, including median values ​​or arithmetic mean; and / or model-based determined temperatures on the radiating surface and / or on the reference plane using a predictive model.

[0059] By including the electricity consumption values ​​of the heating sources, it is possible to determine the power output in the different stages and, based on this data, to control the system in the most energy-efficient way possible.

[0060] According to a preferred embodiment of the system, the heating source is selected from the group comprising: Infrared heaters that emit heat with a radiation component of at least 40%, Low-temperature radiators with surface temperatures up to 100 °C; high-temperature radiators with surface temperatures above 100 °C; infrared dark radiators or infrared bright radiators; electric heating systems that emit long-wave infrared radiation; and / or photon heaters.

[0061] If heating sources with large radiation angles are advantageous for the user application, photon heaters with radiation angles of up to 360° are suitable.

[0062] Particularly preferred are heating sources that emit IR-C radiation, which is in the long-wave range and covers wavelengths in the range of 3-10,000 µm.

[0063] In order to take advantage of the benefits of the control system according to the invention, heating sources that are not dimmable and can only be switched on or off are particularly suitable.

[0064] Furthermore, a method for controlling at least one infrared heating source using the control system described above is provided, comprising the following steps: Providing at least one or more heating sources that emit radiation in the infrared range to heat a room, preferably in an arrangement angle determined by a design model and, in the case of more than one heating source, comprising a certain distance between each other: Measuring an air temperature; Storing database data in a storage unit, and wherein at least one control device is provided to switch on or off the at least one heating source based on database data and the measured air temperature in order to regulate a predetermined setpoint temperature.

[0065] Furthermore, a plurality of heating sources and an indoor positioning system (IPS) can be provided to detect the position of one or more persons, whereby one or more heating sources are controlled depending on a detected person.

[0066] Furthermore, the procedure for controlling multiple heat sources includes the following procedural steps: Division of the room into a plurality of zones, whereby a user can transmit a setpoint temperature to the control device for a zone; and If target temperatures for a zone are entered for two or more users, an arithmetic mean of the target values ​​for the respective zone is calculated.

[0067] The Indoor Positioning System (IPS) allows users' mobile input devices, such as smartphones or wearables, to be located and receive data, such as a target temperature, from them via wireless communication. The target temperature is entered via these devices, and the IPS automatically detects the zone that needs to be heated by the corresponding infrared heater. If multiple target temperature settings are entered, the system calculates the arithmetic mean for the zone, resulting in a temperature for the entire area. The corresponding module is then controlled according to this average. Brief description of the characters Fig. Figure 1 shows measurement results for the temperature distribution of a conventional infrared heating panel with temperatures in °C; Fig. Figure 2 shows a schematic diagram of an embodiment of a system according to the invention for controlling a heating source; Fig. 3a Schematic flowchart of a further embodiment of a control system with a control device; Fig. 3b Schematic detail view of an exemplary implementation of a database of the in Fig. 3a control device shown; Fig. 4a Measurement results of the temperature distribution for a reference plane at a predetermined distance D(x) = 100 cm; Fig. 4b Measurement results of the temperature distribution for another reference plane at a predetermined distance D(x) = 150 cm; Fig. 5 Measurement results of the temperature distribution with an inclined heating source at a distance D(x) = 100 cm Fig. 6. The surface temperature in °C of a heat source as a function of time in s; Fig. Figure 7a shows an embodiment of a measuring arrangement with a test object; Fig. 7b and c show details of the in Fig. 7a shown test object; Fig. 8 Radiation temperature as a function of time and distance; Fig. 9 duty cycles in a reference plane at a distance of 1.5 m from the heat source as a function of the air temperature; Fig. 10 switching-off durations in a reference plane at a distance of 1.5 m from the heat source as a function of the air temperature; Fig. 11 an embodiment of a system for controlling a heating source in a room used by one person; Fig. 12 another embodiment of a system for controlling a heating source for two users; Fig. Figure 13 shows a system for regulating a room used by a number of people. Detailed character description

[0068] Fig. Figure 1 shows measurement results of the surface temperature distribution in degrees Celsius [°C] of a conventional plate-shaped infrared heating source in operation. It is clear that there is no homogeneity with respect to the temperature distribution. An inhomogeneous temperature distribution is particularly evident at the edges. Temperature maxima are found along the looped heating wire, while the temperature is lower between adjacent heating wire sections. Due to this demonstrated inhomogeneity, it is necessary to determine the actual temperature distribution over a predetermined area of ​​the surface of infrared heating sources from different manufacturers more precisely.

[0069] Fig. Figure 2 shows a schematic diagram of an embodiment of a system 250 according to the invention for controlling a heating source 500 that emits infrared radiation. A user 11 can enter a desired temperature setpoint 111 via an input device 1 or via a suitable user interface, for example, a smartphone or wearable device, which is transmitted to the control device 3. A temperature sensor 201 for measuring the actual air temperature 2 automatically transmits the prevailing air temperature 221 in the room. The control device 3 has a database 300. Depending on the received temperature setpoint 111 from the user, the currently measured air temperature 221, and the data stored in the database 300, a suitable switching time t=301 can be determined. The switching device, preferably arranged in the control device 3, controls the switching time 301 of the heating source 500.The switching time 301 includes heating, on and off durations in order to achieve the temperature setpoint 111 for the user 11 with the installed heating source 500.

[0070] Fig. Figure 3a shows a further schematic flow diagram of another embodiment of a control system 252 with a control device 3 for controlling at least two infrared heating sources 5 and 502. Fig. Figure 3b shows a schematic detail view of an embodiment of a database 300 of the control device 3 of the Fig. 3a. There can also be more than those listed. Fig. The two infrared heating sources 5 and 502 shown in 3a are connected and controlled by the control system 252.

[0071] As in Fig. 2. The control device 3 receives a desired temperature setpoint 111 via an input device 1, which is then passed on to the control device 3. Additionally, an actual air temperature value 2 is transmitted, shown here as an example air temperature 221 (see arrow). Optionally, further data can be passed to the control device 3. The dashed input box indicates that this system component is only optionally provided, i.e., not mandatory. Positioning data 6 can be provided as optional parameters. If the infrared heating sources can automatically change their position, the control device can be used to change the positions of one or more infrared heating sources in addition to controlling the switching times (t=301).

[0072] Fig. Figure 3b shows details of database 300 and, in particular, the data stored in database 300. The first data 310 relate to the heating source 500 and the temperature distribution of various infrared heating sources. Preferably, the previously measured heating sources can be characterized with the determined median values ​​or other statistical parameters of the surface temperature of the heating source. By means of a special measurement method and setup, air temperatures, i.e., T(air), such as T221, T222, T223 at predefined intervals D(x), as well as switching times 301, 302, 303 (time t in minutes or seconds for switching on and off times), can be assigned to each median value of the respective measured heating source.

[0073] The measurement method according to the invention also provides for the measurement of measurement data such as temperatures using at least one test object at predetermined distances from the heating source 500, as is done, for example, in Fig. Figure 7a shows the reference drawing 100. The further data 320 comprise pairs of median temperature values ​​of the heating source surfaces and temperature measurements on a test object 100, which can be arranged at different distances D from the heating source 5. This results in temperatures of the test object at different distances, such as T101 @ D=1, T102 @ D=2.

[0074] Further data 300 in the database relate to temperature setpoints (Tsetpoint), which correspond to measured values ​​on a reference plane at predetermined intervals (multiples of D) depending on the air temperature. Unmeasured values ​​can be additionally determined by interpolation and stored in the database. The test object surface temperatures (T101, T101 at various intervals D), air temperatures, and associated switch-on, switch-off, and heating durations of the heating sources can be stored in a matrix in database 300 and used for controlling the respective measured heating source (product type = Y (501, 505, 507, etc.)).

[0075] Fig. Figure 4a shows measurement results from an optical pyrometer measuring the temperature distribution on a reference plane, with the heat source 500 positioned at a predetermined distance D(x) = 100 cm and parallel to the reference plane. In this case, the plate-shaped heat source was positioned vertically at a distance of one meter from the room wall (here, the reference plane), and the temperature distribution on the room wall was measured with the optical pyrometer. The upper left corner of the heat source 500 is visible in this thermal image and is not to be considered for the measurement results. The distance of 100 cm to the reference plane 401 is illustrated by the double arrow z(A-500) = 100 cm. The area A in the dashed box corresponds to 25% or 1 / 4 of the total area A to be heated. It is located on Fig. Figure 4a shows that a temperature maximum of up to 28°C occurs near the projected center of the heating source 500. The further one moves away from the center of the heating source, the more the temperatures decrease (e.g., to the left outside field A, only temperatures below 20°C are measured). Therefore, with this heating source, only field A with temperatures > 20°C could be adequately heated. If a larger area at a distance z (A-500) = 100 cm were to be heated, another heating source would be required, which would be installed so that the heated areas A are adjacent to each other.

[0076] Fig. Figure 4b shows measurement results of the temperature distribution for another reference plane at a greater distance of D(x) = 150 cm. For these measurements, the heat source was positioned 1.5 m away from the same room wall (reference plane 401) and at the same inclination (vertical or parallel to the room wall) as in Figure 4b. Fig. 4a. The heat source is not visible in the image from the thermal imaging camera or optical pyrometer. In Fig. Figure 4b illustrates that the temperature maximum is lower due to the greater distance than in Fig. 4a, where the maximum values ​​in the projected center are between approximately 22°C and 24°C.

[0077] It will be like in Fig. 4a in Fig. 4b A ¼ area A is drawn (dashed rectangle) to determine a heatable area A (4*1 / 4). To the left of area A, a decrease in temperature below 20°C is again visible. The square represents one quarter of the area and must be doubled in both directions (x to the right and y down) to determine the total area that can be heated to a specific target temperature. In this way, for the respective median value of the heat source surface, an area A can be assigned that achieves a predetermined target temperature (as the mean or median value of the area) on a reference plane (for Fig. 4b is the reference plane in the z-direction positioned at a distance of 150 cm from the heat source).

[0078] The measurements are taken at different intervals than those specified in the Fig. The distances shown in 4a and b were repeated to determine the heatable area with this module at other distances for this specific heat source in a vertical position.

[0079] Furthermore, the radiation angle for a module can be varied, thus determining the optimal positioning data of a heating source for specific applications. For this purpose, measurements are carried out with an angled heating source, as described in Fig. 5 is shown.

[0080] Fig. Figure 5 shows measurement results from a pyrometer for the temperature distribution of a heat source 504 positioned at an angle at a distance D(x) = 100 cm. The heating plate is angled at 45° to the vertical, with its surface facing the ceiling. Part of the heat source 504 (upper left corner) is visible from behind in the image, but is not to be considered for the evaluation, as only the temperature values ​​on the reference plane at a distance of 100 cm from the heat source are taken into account.

[0081] The temperature distribution measured with an optical pyrometer on the reference plane shows a temperature maximum of approximately 24 °C, which is lower than the maximum of the Fig. 4a. The position of the maximum in the Fig. 5 is compared to the temperature maximum of the Fig. 4a, which is located approximately opposite the center or projected center of the heating element plate, is higher. For the measured reference plane at a distance of 1 m, which is arranged vertically in the Y direction, the 45° angled module results in a rather trapezoidal field (see 1 / 2 A). The framed area 1 / 2A represents half the field and is mirrored on the right side to obtain the entire area A. For the design of a room with 2*1 / 2 A = A, this temperature distribution with a lower maximum temperature and simultaneously a greater extent of the heated area A can be relevant for the comfort of the users. Due to the tilt, a temperature distribution results whose vertical extent of temperatures in the range between 22.5 °C and approximately 23.5 °C is longer than in Fig. 4a, which may be advantageous for certain usage conditions.

[0082] Fig. Figure 6 shows the surface temperature in °C of a heating module as a function of time in seconds. For the measurement method according to the invention, in this example, the temperature of the heating source is increased stepwise in 5°C increments after 10 intervals from the lowest control temperature of the heating source (median 55°C) to the highest control temperature of 90°C. Alternatively, the mean value can be used for the control temperature instead of the median value. The in Fig. The time series shown in section 6 ends after approximately 4.5 hours (16435 seconds).

[0083] At the start of the measurement series, a target temperature of 55°C is set and regulated so that the heating source is switched on and off at intervals using a relay. Specifically, at approximately 0 seconds, the temperature is set to 55°C (i.e., target temperature + / - 5K), and the heating source remains switched on until the maximum value of 60°C is reached. The heating module is then switched off to allow cooling to a maximum of -5 K from the target temperature, which corresponds to a minimum temperature of 50°C. This cycle, lasting approximately 3 minutes, is repeated about 10 times per temperature stage, so that each stage lasts about half an hour.

[0084] To reach the next stage with a target temperature of 60°C, the operating time is extended so that the temperature increases from the minimum value to a maximum value 10K higher. Once the new maximum of, for example, 65°C is reached, the heating module remains switched off until the new minimum temperature of 55°C (target temperature - 5K) is reached.

[0085] Due to the large number of measurement cycles (here 10), the target temperature at the end of a stage approaches a value (not shown here) that is representative of that temperature stage. In this way, a target temperature can be assigned to a given control temperature. Preferably, the target temperature is measured in a reference plane at a predetermined distance from the heating module. Possible reference planes and a temperature sensor for detecting a predetermined surface of a heating module are shown schematically in the Fig. 7a shown.

[0086] Fig. Figure 7a schematically shows a heating source 505, wherein a temperature sensor 202, designed as an optical pyrometer, measures a predetermined surface 515. This measuring arrangement 350 is located in a room 400. A temperature sensor 201, designed to measure an air temperature T221, is also provided. The air temperature sensor 201 is located at the height of a reference plane, but preferably not within the radiation field.

[0087] In the example shown, the air temperature T221 is measured at the level of a reference plane 3*D. This reference plane A extends parallel to the surface of the heat source (i.e., in the y-direction) and is located at a distance of 1.5 m (see dashed arrow z (A-505) = 150 cm), where the distance D = 0.5 m. Furthermore, the following is illustrated: Fig. 7a further reference planes arranged parallel to and at different distances from the heat source. In the exemplary embodiment of the in Fig. In the measurement procedure shown in Figure 7a, 5 reference planes are schematically depicted, each spaced approximately 0.5 m apart (5*D = 2.5 m, 4*D = 2 m, 3*D = 1.5 m, 2*D = 1 m and 1*D = 0.5 m). Other values ​​for the spacing and a different number of reference planes can be chosen depending on the geometry of the space to be measured.

[0088] Furthermore, it shows Fig. 7a a test object (100), wherein the test surface 106 facing the heat source has a predetermined emissivity and a temperature sensor 110. Each module has specific on and off durations depending on the distance. Therefore, it is important to know how the reference plane is oriented (here 5*D, 4*D, 3*D, 2*D, 1*D are parallel to the heat source, but could alternatively be at a specific angle to the heat source) and at what distance from the heat source module the reference planes are set up.

[0089] Fig. 7b shows a detailed view of the in Fig. The test object 100 is shown in Figure 7a. A temperature sensor 110 is arranged on one side surface 106, which faces the heating source 505 during the measurement procedure, to measure a current temperature T 103. The test object 100 is elongated and has a longitudinal axis 108 (see dash-dot line).

[0090] Fig. Figure 7c shows a black and white photograph of an embodiment of a test object 100. The temperature sensor 110 was attached using conventional crepe tape 102. This crepe tape has an emissivity of at least 70%, preferably 90%. In a preferred embodiment of the test object, the temperature sensor can be a precision temperature probe, PT100 or PT1000, or another suitable sensor for measuring the temperature T103. This test object is defined as a Brunner dummy.

[0091] Fig. Figure 8 shows the radiation temperature as a function of time and distance, assuming a median surface temperature of the heating source of 70°C. Each curve represents a different distance from the heating source. These are measured values ​​obtained on the test surface under these conditions. By averaging, a correlation can be established between the median surface temperature of the heating module, the ambient air temperature, and the surface temperature of the test object. Following interpolation, the differing integer temperature values ​​on the surface can be assigned to, for example, the on and off times, thus enabling control to any desired integer target temperature or values ​​in between. The further away from the heating source, the more the radiation temperature curve approaches a flatter profile.At a distance of 2.5 m (lowest curve below 20°C), virtually no fluctuations above or below this value are discernible. Generally, according to the inverse square law, radiation intensity decreases fourfold for every doubling of the distance.

[0092] Fig. Figure 9 shows a section of the switch-on time in seconds [s] for different setpoint temperatures at a distance of 1.5 m. The time curve is truncated at the height of the time axis as a function of the air temperature in °C. The warmer the air temperature in the room, the shorter the required switch-on times. Thus, at the 24 °C line at the height of an air temperature of 20.5 °C, the switch-on time is between 150 s and approximately 105 s. At an air temperature of 19 °C, the switch-on time for a setpoint temperature of 22.5 °C is approximately 100 s. At an air temperature below 16.5 °C, the switch-on time for a setpoint temperature of 21.5 °C is over 220 s.

[0093] Fig. 10 shows an excerpt of the Fig. 9 corresponding switch-off durations. Here, the same setpoint temperatures (increased from 20.5 °C in 0.5 °C increments up to 24 °C) are shown as a function of time [s] and air temperature in °C. The switch-off durations are significantly shorter than the switch-on durations. At a setpoint temperature of 24 °C, the switch-off duration ranges from 56.5 s at an air temperature of 20 °C to approximately 66.1 s at an air temperature of 20.5 °C. Fig. 9 and Fig. Figure 10 shows that when the air temperature changes, the on and off durations are adjusted accordingly. This also applies when the target temperature is changed by the user. Using the measurement results, all relevant information for each individual value can be stored in a database, specific to the measured infrared heating source. The temperature resolution can be adjusted as needed through interpolation and calculated to integer values, values ​​in increments of 0.5, or even arbitrarily small values ​​from 0.1 to 0.001. It should be noted that humans cannot perceive small temperature changes with sufficient accuracy, which is why a reasonable resolution should be chosen.

[0094] In Fig. Figure 11 shows an example of a control system 800, where a user 11 is present in a one-person office. A heating module 505 is suspended vertically (i.e., not angled to the room wall at 0°) near a wall, and a desk 806 is positioned in front of it, which is irradiated by the heating source 505 when it is operating. In this application, the control system 800, or rather the control model, would have to be set to "distance 2". This "distance 2" corresponds, for example, to approximately 100 cm if the distance is half a meter, i.e., 1*D = 0.5 m. Since only one user 11 is to be irradiated here, the room can be fully equipped with this single heating source 505.

[0095] Fig. Figure 12 shows a further embodiment of a control system 902 comprising a heat source 507. Below the heat source 507 are two tables 806 and associated users 11 and 801, respectively. In this case, the heat source 507 is ceiling-mounted, with its surface oriented at 90° to the vertical or horizontally. Assuming 1*D = 0.5 m, the room in this embodiment is approximately 2 m high, or 4*D. Due to the ceiling mounting, the distance between the heat source 507 and the user 11 is greater than in the figure shown in Figure 12. Fig. Case 11 shown.

[0096] For the control of system 902, a reference plane is again selected that is arranged parallel to the heating surface. In this embodiment of system 902, the heating source 507 is arranged parallel to the surface of the table 806 or to the ceiling. The optimal distance for user 11 is "distance 3," which in reality measures approximately 150 cm. The correct distance for the heating source or module variant is stored in system 902 or the control model so that the greater distance is taken into account in this application. When the heating source 507 is operating with the data stored from the database, both users 801 and 11 can be sufficiently irradiated so that a selected target temperature is reached on the table surface.

[0097] Knowing that a distance of approximately 150 cm is necessary for embodiment 902, suitable heating sources or module types are selected from the database. For example, with one manufacturer's low-power heating source, regulation is no longer possible beyond a distance of 100 cm because the radiation intensity becomes too low. Therefore, sufficiently powerful heating sources or modules must be selected for system 902. Consequently, different heating sources 507 or modules are suitable for different applications.

[0098] Fig. Figure 13 shows a top view of a system 910 for regulating a multi-person room with several multi-person tables 816 (6 per table) and one single table 806. Such an arrangement can be found, for example, in a university lecture hall. One heating source 507 was selected for the single table, and two spaced-apart heating sources 506 were selected for each of the other tables. In this exemplary case, the radiation area of ​​the heating source 506, and thus a zone, is relatively small and can heat 3 seats. Therefore, for 6 seats or users (see users 801, shown as gray circles), 2 modules are installed on the ceiling above the tables 816 per row, and this is repeated according to the number of rows. The entire room can also be designed according to this principle. The field size A is determined for each heating source 506 or 507 using the measurement methods already described (see, for example, Figure 13). Fig. 4b (for 150 cm) defined, the entire room can be heated.

[0099] Furthermore, the regulation applies to system 910 in Fig. It is possible that only the zones occupied by users (801) are activated. An indoor positioning system (IPS) can determine the position of each building user and communicate this information, for example via an app, to the control unit (not shown) of the heating source. This allows the desired target temperature to be communicated to the control unit, and the IPS can then activate the corresponding infrared heating source for that zone (here represented by the gray shaded areas A at 3*D = 1.5 m from the ceiling heating source). This allows the room to be divided into zones that can be heated unevenly.

[0100] Another use case for an IPS (Integrated Heat System), not shown here, would be, for example, that on sunny days, the person sitting near the window would adjust the heating element differently, as they would prefer a different temperature from the infrared heater due to the additional heat radiation from the sun, compared to someone sitting further into the room. If multiple settings are applied within a zone, the target temperature for that zone is calculated and set using the arithmetic mean. If this more expensive solution is not desired, a controller for each module can determine the operating status and target temperature. Alternatively, a target temperature can be preset during system installation, and the heating elements can then be individually switched on or off using separate switches. Reference symbol list 1 Input device for temperature setpoint 2. Actual air temperature 3 Control device comprising switching device 5 Heat source 6 Optional positioning data 11 users 100 test objects 102 crepe tape 106 a test object surface facing the heat source 108 Longitudinal axis of the test object 110 Temperature sensor on the test object 111, 112, 113 Target temperature (Tset) 201 Temperature sensor for air temperature 221 Air temperature 250 system for regulation 252 Control system 300 database 301, 302, 303 Switching times such as on (including heating time) and off times 310 First data from the database 320 Additional data relating to the test object 330 Further data and value pairs, among others, related to a reference level 350 measuring arrangement 400 room 401 Reference plane = X*D 500 heating source 502 second infrared heating source 504 Heating source arranged at an angle of 45° to the vertical 505 vertically arranged heating source 506 heating sources arranged horizontally in pairs on the ceiling 507 horizontally arranged heating source on the ceiling 800 Example of a control system 801 users 806 Single table 816 Multi-table 902 further embodiment of a system for control 910 further embodiment of a system for control A heated area D distance 1*D first reference plane 2*D second reference plane 3*D third reference plane 4*D fourth reference plane 5*D fifth reference plane T101 Surface temperature of the test object at distance D=1

Claims

[1] Measurement method for determining radiation properties of a heating source (500, 504, 505, 506, 507) comprising the following steps: Arranging a heat source (500, 504, 505, 506, 507) with a vertical orientation along its main extent or in a position angled with respect to the vertical in the range up to a maximum of 180°; Providing an irradiable test object (100) with a longitudinal axis (108) and / or at least one central axis, wherein a test object surface (106) facing the heating source (500, 504, 505, 506, 507) has a predetermined emissivity and is arranged at a predetermined distance (D) from the heating source (500, 504, 505, 506, 507); Attaching at least one temperature sensor (110) for detecting at least one surface temperature (T101, T102, T103) to the surface of the test object (106) facing the heating source (500, 504, 505, 506, 507); and / or Providing a temperature sensor (201) or another temperature sensor (202) spaced away from the test object (100) for measuring an air temperature (T221, T222, T223) and at least one radiation temperature, Emitting infrared radiation to achieve a predetermined control temperature range of a predetermined surface (515) of the heating source (500, 504, 505, 506, 507); Determining the heat source temperature distribution of the predetermined surface (515) of the heat source using the spaced-apart temperature sensor (201) or the additional temperature sensor (202); Analysis of the recorded measurement data to determine the predetermined control temperature range of the predetermined surface (515) of the heating source (500, 504, 505, 506, 507) and the air temperature (T221, T222, T223) of the measured surface temperature (T101, T102, T103) of the test object surface (106) and / or of at least one radiation temperature, wherein the predetermined control temperature range preferably corresponds to a median value of the predetermined surface (515) of the heating source (500, 504, 505, 506, 507). [2] Measuring method according to claim 1, wherein the at least one temperature sensor (110) designed to measure temperatures of the test object (100) is selected from the group comprising: Measuring probes for temperature measurement; Thermowire; Precision resistance sensor; PT 100 and / or PT1000; an optical pyrometer or a thermal imaging camera; and / or a combination of these; and / or wherein preferably the temperature sensor (201) spaced away from the test object (100) and / or further temperature sensor (202) designed to detect the temperature distribution on the heating source (500, 504, 505, 506, 507) is an optical pyrometer or a thermal imaging camera. [3] Measuring method according to claim 1 or 2, wherein the test object (100) has a predetermined heat capacity and the emissivity of the test object (100) is at least 70%, preferably 95%, and; wherein the test object (100) is plate-shaped or rod-shaped and has a thickness between 10 mm and 200 mm and wherein a central axis and / or the longitudinal axis of the test object (100) is aligned parallel to the surface of the heating source, wherein the test object (100) preferably consists of an insulating material which has a layer on the surface facing the heat source (500, 504, 505, 506, 507) that increases the emissivity to at least 70%. [4] Measuring method according to one of the preceding claims, wherein the sensors (110) are attached to the test object (100) by means of an adhesive film with an emissivity of at least 30%, preferably a crepe tape (102) with an emissivity of at least 90%. [5] Measuring method according to one of the preceding claims, wherein measurements are carried out with the spaced-apart temperature sensor (201) or further temperature sensor (202) in a reference plane which is arranged at a predefinable distance to the heating source (500, 504, 505, 506, 507) in order to preferably record a thermal image, wherein these measurements are repeated at different distances of the heating source (500, 504, 505, 506, 507) to the reference plane. [6] Measuring method according to one of the preceding claims, wherein the measurements are carried out at different air temperatures between 12°C and 28°C and preferably each air temperature (T221, T222, T223) can be assigned to a temperature setpoint (111, 112, 113) on a reference plane, wherein the temperature setpoint (111, 112, 113) corresponds to a predetermined control temperature range, preferably a median value of the predetermined surface (515) of the heating source (500, 504, 505, 506, 507). [7] Measuring method according to any of the preceding claims, further comprising providing a multimeter for measuring the current, voltage and / or electrical power of the heating source (500, 504, 505, 506, 507); and Determining the heating, switching-on, and switching-off duration (301, 302, 303) of the heating source (500, 504, 505, 506, 507) for the respective control temperature range, which is selected from a plurality of temperature levels, preferably between 50°C and the maximum temperature of the heating source (500, 504, 505, 506, 507), wherein the heating source (500, 504, 505, 506, 507) has a temperature in a predeterminable range of preferably between + / - 5 K and + / - 2.5 K around the control temperature, by switching the heating source (500, 504, 505, 506, 507) on and off at intervals by means of a relay, wherein preferably an interval of less than 15 minutes, preferably less than 3 minutes in length is chosen. [8] Measuring method according to one of the preceding claims, wherein the predetermined distance of the test object (100) is varied and the respective surface temperature (T101, T102, T103) on the test object (100) and / or radiation temperature is determined as a function of the distance and the control temperature range of the heating source (500, 504, 505, 506, 507). [9] Measuring method according to one of the preceding claims, wherein the angular position of the heating source (500, 504, 505, 506, 507) is varied. [10] System for controlling at least one heating source (5, 500, 502, 504, 505, 506, 507) or several heating sources (5, 502, 506, 507) emitting infrared radiation to heat a room (400), comprising: a control device (3) which is configured to receive measurement data from an air temperature sensor (201); a storage unit for storing database data (310), and wherein the control device (3) is configured to use the database data (310) and measurement data from the air temperature sensor (201) to switch on or off the at least one heating source (5, 500, 502, 504, 505, 506, 507). to switch off in order to control a predetermined setpoint temperature on a reference plane; wherein the database data (310) are at least partially based on a measurement method according to one of claims 1-9 and comprise at least the following data: Air temperature measurement data Measurement data of the surface temperatures of the heating source (500, 504, 505, 506, 507) including control temperature values; Measurement data of the surface temperatures of the test object (100) comprising target temperature values ​​on a reference plane; calculated data; Switch-on, switch-off and heating-up times (301, 302, 303); and combinations thereof. [11] System according to claim 10, wherein the predetermined setpoint temperature for a reference plane at a selected distance to the respective heat source (500, 504, 505, 506, 507) is controllable. [12] System according to claim 10 or 11, wherein the air temperature sensor (201) is arranged in a reference plane at a predetermined distance to the respective heat source (500, 504, 505, 506, 507). [13] System according to any one of claims 10 to 12, wherein the database data (310) are further selected from the group comprising: Estimates determined by interpolation methods including switch-on, switch-off and heating durations (301, 302, 303) or temperature estimates between measurement data of different adjacent temperature values; Estimates determined by interpolation methods, including consumption values, to determine the power output of the heating source (500, 504, 505, 506, 507); Estimated temperatures on a reference plane, calculated depending on the distance of the reference plane to the heat source (500, 504, 505, 506, 507), estimated temperatures on a surface of a test object (100) or dummy, which are calculated as a function of the distance to the heat source (500, 504, 505, 506, 507), wherein the test object (100) preferably has a defined heat capacity and surface with a predetermined defined emissivity. [14] Method for controlling at least one infrared heating source using a system according to any one of claims 10-13, comprising the steps: Providing at least one heating source (5, 500, 502, 504, 505, 506, 507) or several heating sources (5, 502, 506, 507) that emits radiation in the infrared range to heat a room (400), comprising: Measuring an air temperature (T221); Storing database data (310) in a storage unit, and wherein at least one control device (3) is provided to switch on or off the at least one heating source (5, 500, 502, 504, 505, 506, 507) based on database data (310) and the measured air temperature (T221) in order to control a predetermined setpoint temperature. [15] Method according to claim 14, wherein a plurality of heating sources (5, 502, 506, 507) and an indoor positioning system (IPS) are provided for detecting the position of one or more persons, wherein one or more heating sources (5, 502, 506, 507) are controlled depending on a detected person. [16] Method according to claim 15, further comprising: Subdivision of the space (400) into a plurality of zones, wherein a user can transmit a setpoint temperature to the control device (3) for a zone; and If target temperatures for a zone are entered for two or more users, an arithmetic mean of the target values ​​for the respective zone is calculated.

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