Method for regulating a heating appliance with two heating elements

Abstract

Method for regulating a two-element heating appliance. The invention relates to a method for regulating a heating appliance (10), comprising: a front panel (24); a first electric heating element (16) in contact with the front panel; a thermal inertia heating body (14); a second electric heating element (18) in contact with the heating body; and a sensor (19) for an outside air temperature T. A nominal power (P0) of the heating appliance is the sum of the powers (P1, P2) of the first and second heating elements; a threshold α is parameterized in the appliance. A heating power P is determined as a function of the temperature T. Depending on whether P ≤ αP0 or P > αP0, heating priority is given respectively to the first or second heating element. Figure for the abstract: Figure 1

Description

Title of the invention: Method for regulating a heating appliance with two heating elements

[0001] The present invention relates to a method for regulating a heating appliance, said appliance comprising: a casing defining an interior space of said appliance, the casing comprising a front of the appliance, the casing comprising air circulation openings between the interior space and an exterior of the appliance; a first electric heating element, arranged in the interior space, in contact with the front, and characterized by a first heating power; a heating body, formed of a thermal inertia material and arranged in the interior space; a second electric heating element, in thermal contact with the heating body and characterized by a second heating power, the heating body being capable of storing heat emitted by the second heating element and of restoring said heat to air outside the appliance; and a sensor of a temperature of said outside air;a nominal power of the heating appliance being equal to the sum of the first and second heating powers.;

[0002] Such a heating device is notably described in document FR2992052, in the name of the Applicant.

[0003] In such devices comprising a heating element on the front and an inertia heating body, it is known that the best results, in terms of comfort according to the energy consumed, are obtained by heating by radiation on the front.

[0004] However, inertia heating bodies have the advantage of accumulating heat and releasing it gradually, even in the event of a power cut.

[0005] When the electrical network is in an overload situation, presenting risks of short-term load shedding, it is therefore advantageous to take such risks into account in the regulation of the heating appliance.

[0006] To this end, the invention relates to a regulation method of the aforementioned type, in which a first threshold a such that 10% < a < 70% is set in the heating appliance; and the method comprises the following steps: a heating power P is determined for the heating appliance as a function of the outside air temperature and a set temperature, set in the heating appliance; if P < aP0, a heating priority for the first heating element is implemented; and if P > aP0, a heating priority for the second heating element is implemented; a heating priority for the n-th heating element, n being chosen from 1 and 2, being such that: if P < Pn, only said n-th heating element is supplied with electricity; and if P > Pn, said n-th heating element delivers a power Pn and the other of the first and second heating elements delivers a power equal to (P - Pn).

[0007] According to other advantageous aspects of the invention, the regulation method comprises one or more of the following characteristics, taken in isolation or in all technically possible combinations:

[0008] - the heating appliance comprises a clock capable of determining a time t; a time slot ([t0; tj) is set in the heating appliance; a second threshold [3 such that a < [3 < 100% is set in the heating appliance; and the method comprises a step such that, if at t = t0 we have P(t0) > [3P0, then, between t0 and tb the heating power P is limited to said value P(t0); and the electricity supply to the first and second heating elements is interrupted during a number k of successive cuts, k being an integer greater than or equal to 1 set in the heating appliance;

[0009] - the first threshold a is close to or equal to 40% and the second threshold [3 is close to or equal to 60%;

[0010] - a value y such that 10% < y < 50% is set in the heating device, so that the total duration of the cuts over the time slot ([t0 ; tj) is equal to y(ti - t0 );

[0011] - the value y is between 20% and 30%, preferably close to or equal to 25%;

[0012] - k is an integer greater than or equal to 3;

[0013] - the or each cut has a default duration ôtb set in the device heating; the or each cut-off begins at a time fo with L < ti0 < tb i being between 1 and k; and if at a time t3 such that ti0 < t3 < (ti0 + ôti), the measured temperature is less than or equal to (Ti0 - AiT), Ti0 being the temperature at the start of the cut-off i considered and AiT being a value set in the heating appliance, then the possible following cut-off(s) over the time range [t0; tj have a corrected duration ôt3, less than the default duration ôti;

[0014] - if at a time t4 such that to < t4 < tb the measured temperature T is less than or equal to at (Te - A2T), A2T being a value set in the heating device, then the cuts are interrupted at said time t4;

[0015] - the or each cut begins at a time ti0 and ends by default at a time tib with t0 < fo < tu < tb i being between 1 and k; and if at time tib the measured temperature is greater than (Ti0 - A3T), Ti0 being the temperature at the start of the cut-off i considered and A3T being a value set in the heating device, then the corresponding cut-off i is extended.

[0016] The invention further relates to a heating apparatus comprising: a casing defining a space inside said apparatus, the casing comprising a front of the appliance; the casing comprising air circulation openings between the interior space and an exterior of the appliance; a first electric heating element, arranged in the interior space, in contact with the front, and characterized by a first heating power; a heating body, formed from a material with thermal inertia and arranged in the interior space; a second electric heating element, in thermal contact with the heating body and characterized by a second heating power; the heating body being capable of storing heat emitted by the second heating element and of restoring said heat to air outside the appliance; and a sensor (19) of a temperature of said outside air; said appliance being provided with means for implementing a regulation method as described above.

[0017] Preferably, a ratio of the heating powers of the second heating element relative to the first heating element is between 1 and 2, more preferably close to or equal to 1.5.

[0018] The invention will be better understood on reading the description which follows, given solely by way of non-limiting example and made with reference to the drawings in which:

[0019] [Fig-1] [Fig.l] is a schematic view, in section, of a heating apparatus according to one embodiment of the invention;

[0020] [Fig.2] [Fig.2] is a flowchart of a method for regulating the apparatus of [Fig.l]; and

[0021] [Fig.3] [Fig.4] [Fig.3] and [Fig.4] are time diagrams of re processes regulation of the device of [Fig.l].

[0022] [Fig. 1] schematically represents, in section, a heating appliance 10 according to one embodiment of the invention. Preferably, the appliance 10 is a domestic heating appliance, or radiator. In the following description, the appliance 10 is considered to be installed in a room of a residential building.

[0023] The apparatus 10 comprises in particular: a casing 12; a heating body 14; a first 16 and a second 18 electric heating elements; a temperature sensor 19 and an electronic control module 20.

[0024] The envelope 12 defines an interior space 22 for the device 10. The envelope 12 includes in particular a facade 24, intended to be arranged substantially vertically, facing the room equipped with the device 10.

[0025] The facade 24 is made of a material capable of emitting infrared radiation under the effect of an increase in temperature. For example, the facade 24 is made of a metal such as steel, or even glass or stone.

[0026] The casing 12 further comprises air circulation openings 26, 28. For example, the casing 12 comprises lower openings 26 and upper openings upper walls 28, arranged respectively in a lower wall and in an upper wall of said envelope.

[0027] The heating body 14 is arranged in the interior space 22 of the apparatus 10. More precisely, the heating body is arranged so as to allow the circulation of a flow 30 of air around said heating body, said flow 30 of air moving between the lower 26 and upper 28 openings as described below.

[0028] The heating body 14 is made of a material with thermal inertia, that is to say a material capable of storing heat and gradually restoring it to the air flow 30. The heating body 14 is for example made of a metal such as cast iron.

[0029] The first electric heating element 16 is arranged in the interior space 22, in thermal contact with the facade 24, so as to transfer heat to said facade. Preferably, the first heating element 16 is in the form of a screen-printed film, glued to the facade 24, or even an electric heating wire pressed against said facade, as described for example in the aforementioned document FR2992052.

[0030] The second electric heating element 18 is in thermal contact with the heating body 14, so as to transfer heat to said heating body. Preferably, the second heating element 18 is in the form of an electrical resistor incorporated in the mass of the heating body 14, as described in document FR2991845 in the name of the Applicant.

[0031] The first 16 and second 18 heating elements are characterized respectively by a first heating power Pi and by a second heating power P2. A nominal power Po of the heating apparatus 10 is equal to the sum Pi + P2 of the first and second heating powers.

[0032] More precisely, Pi and P2 correspond to maximum heating powers, delivered respectively by the first 16 and by the second 18 electric heating elements continuously supplied with electricity.

[0033] Preferably, a P2 / Pi ratio is between 1 and 2. For example, the P2 / Pi ratio is of the order of 1.5, the P2 / P0 ratio thus being of the order of 60%.

[0034] When a heating element is requested to deliver a power P' lower than its heating power, as detailed below, said heating element is supplied with electricity in the form of short time cycles, of the order of a second. Each cycle comprises a period pi of supply and a period p2 of interruption of said supply. The ratio r = pi / (pi+p2) corresponds to the operating rate of the heating element. The power P' delivered by the heating element of heating power Pn, n being chosen between 1 and 2, is P' = rn^Pn.

[0035] The temperature sensor 19 is located outside the interior space 22 and is capable of measuring a temperature T of the room equipped with the device 10. For example, the sensor 19 is arranged at the inlet of the air flow 30, close to the openings in- lower 26 of envelope 12.

[0036] The electronic control module 20 is connected to the temperature sensor 19 and to a power supply of the first 16 and second 18 heating elements. Preferably, the module 20 is arranged in the casing 12. Alternatively, the module 20 is located in a remote housing.

[0037] The module 20 comprises in particular a program memory 32, a data memory 34 and a clock 36.

[0038] The program memory 32 stores a program 40 allowing the implementation of a method 100 for regulating the device 10. The method 100, schematically represented in [Fig.2], will be described below.

[0039] The data memory 34 stores in particular a first threshold a such that 10% < a < 70%. More preferably, the first threshold a is between 30% and 50%. Even more preferably, the first threshold a is close to or equal to 40%.

[0040] The data memory 34 also stores a set temperature Tc, which is the desired temperature of the room equipped with the device 10. Preferably, the set temperature Tc can be modified by a user, by means of an interface connected to the module 20.

[0041] The clock 36 is capable of measuring a time t, in particular in the form of a date and a time. Preferably, the clock 36 can be set by a user, by means of the interface connected to the module 20.

[0042] The method 100 for regulating the apparatus 10 will now be described.

[0043] In a first step 102, the temperature T of the room is measured by the sensor 19. Then (step 104) a heating power P is determined by the program 40, as a function of the measured temperature T and the set temperature Tc. The determined power P is less than or equal to the nominal power Po. More precisely, the ratio P / Po corresponds to the overall operating rate of the device 10.

[0044] We consider a first case, in which the determined power P is less than or equal to the value aP0, a being the first threshold indicated above. Such a power P implies moderate heating requirements, making the need for load shedding on the electricity network unlikely.

[0045] Consequently, if P < aP0, a heating priority for the first heating element 16 is implemented (step 106).

[0046] The heating priority for the first heating element 16 applies as follows: if P < Pb only the first heating element 16 is supplied with electricity; and if P > Pi, said first heating element is supplied with electricity continuously, so as to deliver a power Pi; and the second heating element 18 is supplied with electricity so as to deliver a power equal to (P - Pi).

[0047] In such a configuration, the device 10 heats primarily by radiation, the facade 24 emitting infrared rays into the room under the effect of an increase in its temperature.

[0048] If P > Pb the second heating element 18 is also supplied with electricity and the air flow 30 is heated by thermal convection, passing into contact with the heating body 14.

[0049] We now consider a second case, in which the determined power P is greater than the value aP0. Such a power P implies significant heating requirements, characteristic of the coldest days of the year. Such climatic conditions increase the probability that load shedding on the electricity network will be necessary.

[0050] Consequently, if P > aP0, a heating priority for the second heating element 18 is implemented (step 108).

[0051] The heating priority for the second heating element 18 applies as follows: if P < P2, only the second heating element 18 is supplied with electricity; and if P > P2, said second heating element delivers a power P2 and the first heating element 16 delivers a power equal to (P - P2).

[0052] In such a configuration, the device 10 heats primarily by thermal convection, with a possible supplement by radiation, in particular if P > P2. In addition, the second heating element 18 is supplied with electricity so as to accumulate heat in the heating body.

[0053] Thus, if load shedding on the electrical network occurs after the implementation of step 108, the heating body 14 is able to diffuse the accumulated heat by convection, even in the absence of electrical power to the appliance 10. The thermal comfort of the room equipped with the appliance 10 is therefore little degraded during the load shedding.

[0054] According to one embodiment, the method 100 also makes it possible to reduce the electrical consumption of the device 10 at certain time slots. These are, for example, time slots statistically corresponding to an overload of the electrical network.

[0055] According to a first variant not shown, the device 10 is connected to a centralized control unit, capable of sending instructions to said device 10 as well as to other devices equipping the housing. The centralized control unit is for example capable of receiving instructions for load shedding from the electrical network and of passing them on to the device 10.

[0056] According to a second variant, shown in [Fig. 2], the device 10 is not connected to any centralized control unit and is not configured to receive information on the state of the electrical network. The time slots for reducing electrical consumption are pre-programmed in the electronic module 20 of command for the implementation of the method 100.

[0057] According to said second variant, at least one time slot [t0; tj is stored in the data memory 34. Said time slot is for example located between 6:30 p.m. and 8:11 p.m., such a time slot statistically corresponding to excess electricity consumption at the national level. As a variant, the data memory 34 stores an additional time slot, located in the morning.

[0058] According to said second variant, the data memory 34 further stores a second threshold [3 such that a < [3 < 100%. The second threshold [3 preferably corresponds to heating requirements characteristic of particularly cold periods, frequently associated with load shedding requirements on the electrical network.

[0059] Preferably, [3 = P2 / Po, that is to say that the second threshold ^corresponds to a maximum stress on the second heating element 18. For example, [3 = 60% for a first threshold a of 40%.

[0060] According to said second variant, if at t = t0 we have P(t0) > [3P0, then (step 110), between to and tb the heating power P is limited to said value P(t0); and the electricity supply to the first and second heating elements is interrupted during a number k of successive cuts, k being an integer greater than or equal to 1. The value of k is stored in the data memory 34.

[0061] Preferably, the number k of cuts is a function of the duration of the time slot [to; tj. For example, the number k is chosen in accordance with [Table 1] table 1 below: Duration of the time slot [t0 ; tj (h) Number k of cuts 1 1 2 3 3 5 4 6 5 8

[0062] Table 1

[0063] For example, the total duration At of power outages over the time slot [t0; tj is equal to y(ti - to), with 10% < y < 50%. Preferably, y is between 20% and 30%. More preferably, y is close to or equal to 25%, the total power outage time representing approximately a quarter of the total duration of the time slot [to; tj.

[0064] Preferably, each of the k successive cuts has the same default duration ôtb equal to At / k.

[0065] [Fig.3] schematically represents different scenarios A, B, C, D of step 110 over the time range [to; tj, as well as an evolution of the temperature T of the room according to said scenario.

[0066] Thus, over the time range [t0; tj, step 110 comprises at least one cut-off 50, during which the first 16 and second 18 heating elements are not supplied with electricity, and at least one heating period 52 during which the first 16 and second 18 heating elements are supplied with electricity.

[0067] For each of the scenarios A, B, C, D, the first cut-off 50 begins at t0 and the first cut-off is followed by a heating period 52.

[0068] For scenarios A, B and C, the number k of successive cuts 50 over the time slot [t0; tj is respectively equal to 1, 2 and 3. For scenario D, over the time slot [t0; tj, step 110 comprises a high number of very brief cuts, of the order of a second. Scenario D corresponds substantially to a reduction in the operating rate rn of each of the first and second heating elements over the time slot [t0; tj.

[0069] For a given scenario A, B, C or D, the cuts have the same duration ôq as indicated above. Similarly, for a given scenario A, B, C or D, the heating periods 52 following the cuts 50 have the same duration equal to (1 - y)(ti - to) / k. In the example of [Fig.3], y = 25%.

[0070] As indicated previously, during the at least one heating period 52, the power P delivered by the heating appliance is limited to the value P(t0). This avoids excessive heating during the heating period(s) 52 following a cut-off 50.

[0071] [Fig.3] also shows experimental results corresponding to an evolution of the temperature T as a function of time, according to scenario A, B, C or D.

[0072] In scenario A, comprising a single cut-off 50 followed by a single heating period 52 over the time slot [t0; tj, the temperature of the room considered undergoes a maximum drop ATA of 1.1°C during the cut-off.

[0073] In scenarios B and C, the maximum decreases ATB and ATc of the temperature T are respectively 0.9°C and 0.7°C. In scenario D, the maximum decrease ATD is also 0.7°C.

[0074] In order to limit the drop in temperature over the time range [t0; tj, it therefore seems advantageous to choose a value of k greater than or equal to 3.

[0075] [Fig.4] schematically represents the aforementioned scenario C, as well as scenarios E, F and G of step 110 over the time slot [t0; tj.

[0076] In the example of [Fig.4], we have ay = 25% and k = 3 for each of the scenarios C, E, F, G.

[0077] Each of the scenarios E, F and G includes an initial heating period 54, starting at to. The initial heating period 54 has a non-zero duration ôt2, stored in the memory 34 of data and less than or equal to (1 - y)(ti - t0) / k. In the example of scenarios E, F, G of [Fig.4], the initial heating period 54 of each of said scenarios has a specific duration ôt2, equal to môtb m being an integer between 1 and 3. Thus, the cuts 50 of scenarios C, E, F and G do not occur at the same times over the time slot [t0; tj.

[0078] In one embodiment, the value of ôt2 is chosen randomly during the manufacture of the appliance 10. For example, the value of ôt2 is chosen equal to jôti, j being an integer between 0 and 3 chosen randomly, so as to apply to said appliance one of the scenarios C, E, F and G. Thus, in the case of a dwelling comprising several appliances 10, the cuts 50 can occur at different times over the time range [t0; tj, for better thermal comfort in the dwelling.

[0079] Alternatively, the value of ôt2 or j is set at the time of installation of the device 10 in the housing. Several different values ​​of ôt2 can thus be chosen for different devices 10 equipping the same housing.

[0080] As a second variant, in the case of devices communicating with each other in the same room, the value of ôt2 or j can be assigned by the master device of the communication protocol.

[0081] According to one embodiment, the method 100 is configured to limit the degradation of thermal comfort over the time range [t0; tj of reduction in the electrical consumption of the device 10.

[0082] According to such an embodiment, it is considered that each of the k cuts 50 occurring in the time slot [t0; tj begins at a time ti0, i being between 1 and k. By default, each of said cuts ends at a time (ti0 + ôti), ôti being the default duration of each cut, defined previously.

[0083] During each cut-off 50, i.e. on each range [ti0; ti0 + ôtj, the temperature T is controlled by the sensor 19 and compared (step 112) to a value (Ti0 - AiT), Ti0 being the temperature at the start of the cut-off i considered and AiT being a first temperature difference stored in the data memory 34. For example, AiT = 0.3 °C.

[0084] If at a time t3 such that ti0 < t3 < (ti0 + ôti), the temperature T is lower than (Ti0 - Ai T), then the cuts 50 of the time slot [t0; tj occurring from time t3 have a corrected duration ôt3, lower than the default value ôti (step 114). Preferably, the program 40 defines ôt3 as a percentage of ôti; for example, ôt3 .0.8^ôti.

[0085] According to another embodiment, over the time range [t0; tj, the temperature T controlled by the sensor 19 is compared (step 116) to a value (Tc - A2T), A2T being a second temperature difference stored in the data memory 34, with A2T>AiT. For example, A2T =1.0 °C.

[0086] If at a time t4 such that t0 < t4 < tb the temperature T is lower than (Tc - A2T), then step 110 is interrupted (step 118) at said time t4.

[0087] The method 100 thus avoids too great a drop in the temperature T compared to the set temperature during step 110.

[0088] Preferably, step 110 is also interrupted before time ti if the set temperature Tc is modified by the user during the time slot [t0; tj.

[0089] According to another embodiment, the method 100 is configured to optimize the reduction in the electrical consumption of the device 10 as a function of the thermal comfort over the time range [t0; tj.

[0090] According to such an embodiment (not shown), it is considered that each of the k cuts occurring in the time slot [t0; tj begins at a time ti0 and ends at a time tii, i being between 1 and k. For example, tu = ti0 + ôtb

[0091] For each cut-off i considered, the temperature Tn at the end of the cut-off is controlled by the sensor 19 and compared to a value (Ti0- A3T), Ti0 being the temperature at the start of the cut-off i considered and A3T being a third temperature difference stored in the data memory 34. For example, A3T = 0.1 °C.

[0092] If the temperature Tn at the end of the cut-off is greater than (Ti0- A3T), then the current cut-off is extended to a time t5 greater than tu. For example, t5 is such that t0 < t5 < tiet corresponds to a measured temperature T5 less than or equal to (Ti0- A3T). Alternatively, the extension of the cut-off i considered is limited, so as to keep t5 less than or equal to (tu + ôt4), ôt4 being a value stored in the data memory 34.

[0093] The method 100 thus makes it possible to promote radiant heating, which is more efficient, during periods of moderate heating needs; and to anticipate electrical load shedding during periods of high heating needs.

[0094] Preferably, the method 100 makes it possible to punctually reduce the electrical consumption of the appliance 10 during periods of high or very high heating needs, even in the absence of load shedding on the electrical network. Daily consumption peaks can thus be smoothed out.

Claims

Claims

1. Method (100) for regulating a heating apparatus (10), said apparatus comprising: - an envelope (12) defining an interior space (22) of said apparatus, the envelope comprising: a facade (24); and openings (26, 28) for air circulation between the interior space and an exterior of the apparatus; - a first electric heating element (16), arranged in the interior space, in contact with the facade (24), and characterized by a first heating power (Pi); - a heating body (14), formed from a material with thermal inertia and arranged in the interior space; - a second electric heating element (18), in thermal contact with the heating body (14) and characterized by a second heating power (P2); the heating body being capable of storing heat emitted by the second heating element and of restoring said heat to air outside the device; and - a sensor (19) of a temperature (T) of said outside air; a nominal power (Po) of the heating appliance being equal to the sum of the first and second heating powers; the method being characterized in that: a first threshold a such that 10% < a < 70% is set in the heating apparatus; and the method comprises the following steps: - a heating power (P) is determined (104) for the heating appliance as a function of the temperature (T) of the outside air and a set temperature (Tc), configured in the heating appliance; - if P < aPo, a heating priority for the first heating element is implemented (106); and - if P > aP0, a heating priority for the second heating element is implemented (108); a heating priority for the n-th heating element, n being chosen from 1 and 2, being such that: if P < Pn, only said n-th heating element is supplied with electricity; and if P > Pn, said n-th heating element delivers a power Pn and the other of the first and second heating elements delivers a power equal to (P - Pn).

2. A method of regulation according to claim 1, wherein: - the heating appliance comprises a clock (36) capable of determining a time (t); - a time range ([to; tj) is set in the heating appliance; - a second threshold [3 such that a < [3 < 100% is set in the heating appliance; and - the method comprises a step (110) such that, if at t = t0 we have P(t0) > [3P o, then, between t0 and tb the heating power (P) is limited to said value P(t0); and the electricity supply to the first and second heating elements is interrupted during a number k of successive cuts, k being an integer greater than or equal to 1 set in the heating appliance.

3. A regulation method according to claim 2, wherein the first threshold a is close to or equal to 40% and the second threshold [3 is close to or equal to 60%.

4. Control method according to claim 2 or 3, in which a value y such that 10% < y < 50% is set in the heating appliance, so that the total duration (At) of the cuts over the time range ([t0; tj) is equal to y(ti - to).

5. Regulation method according to claim 4, in which the value y is between 20% and 30%, preferably close to or equal to 25%.

6. Regulation method according to one of claims 2 to 5, in which k is an integer greater than or equal to 3.

7. Regulation method according to one of claims 2 to 6, in which: - the or each cut-off has a default duration ôtb set in the heating appliance; - the or each cut-off (50) starts at a time ti0 with t0 < ti0 < 0, i being between 1 and k; and - if at a time t3 such that ti0 < t3 < (ti0 + ôti), the measured temperature is less than or equal to (Ti0 - AiT), Ti0 being the temperature at the start of the cut-off i considered and AiT being a value set in the heating appliance, then the possible following cut-off(s) over the time range [to; tj have a corrected duration ôt3, less than the default duration 00(1 14).

8. Regulation method according to one of claims 2 to 7, in which, if at a time t4 such that to < t4 < tb the measured temperature (T) is less than or equal to (Te - A2T), A2T being a value set in the heater, then the cuts are interrupted at said time t4 (118).

9. Regulation method according to one of claims 2 to 8, in which: - the or each cut-off (50) begins at a time ti0 and ends by default at a time tu, with t0 < ti0 < t^ < tB i being between 1 and k; and - if at time t^, the measured temperature is greater than (Ti0 - A3T), Ti0 being the temperature at the start of the cut-off i considered and A3T being a value set in the heating appliance, then the corresponding cut-off i is extended.

10. Heating apparatus (10) comprising: - a casing (12) defining an interior space (22) of said apparatus, the casing comprising a front (24) of the apparatus; the casing comprising openings (26, 28) for air circulation between the interior space and an exterior of the apparatus; - a first electric heating element (16), arranged in the interior space, in contact with the front (24), and characterized by a first heating power (Pi); - a heating body (14), formed of a thermal inertia material and arranged in the interior space; - a second electric heating element (18), in thermal contact with the heating body (14) and characterized by a second heating power (P2); the heating body being capable of storing heat emitted by the second heating element and of restoring said heat to air outside the apparatus; and - a sensor (19) of a temperature (T) of said outside air;said apparatus being provided with means (20, 32, 40) for implementing a method according to one of the preceding claims.;

11. Heating apparatus according to claim 10, in which a ratio (P2 / Pi) of the heating powers, of the second heating element (18) relative to the first heating element (16), is between 1 and 2, more preferably close to or equal to 1.5.

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