DE10209598C1 - Charge regulation, for storage heating, involves central controller outputting regulator control parameter at temperatures less than/equal to temperature set for start of charging plus positive value - Google Patents

Abstract

The method involves using a central controller influenced by other equipment, especially a weather sensor and timing element, that outputs a control parameter for a charge regulator at and below a temperature set for the start of charging. The controller outputs the control parameter at temperatures less than or equal to xE2 + a, where a is positive, and the charge regulator inhibits charging initiation at temperatures between xE2 + a and xE2. The method involves using a central controller (2) influenced by other equipment, especially a weather sensor (1) and a timing element (4), that outputs a control parameter for a charge regulator (6) at and below a temperature (xE2) set for the start of charging. The central controller outputs the control parameter at temperatures less than or equal to xE2 + a where a is positive and the charge regulator inhibits the initiation of charging at temperatures between xE2 + a and xE2. AN Independent claim is also included for the following: a storage heating arrangement for implementing the inventive method.

Description

The invention relates to a method for charging control of a storage heater the features of the preamble of claim 1.

Electrically operated heaters in storage heaters are designed to elec to draw energy at certain times, to convert it into heat and temporarily store this heat for time-independent use. An ener Gi recording for charging the electric storage heaters should preferably be Limit to periods when electrical energy is low cost is offered.

Many of them automatically charge electric storage heaters Countries by means of central control devices according to DIN 44574. Thereby for the legs flow of the charge, including the weather, the residual heat in the storage tank and takes into account the changing tariff situation. From the central tax office advises a control signal derived therefrom, which is received by a The device in the electric storage heater is evaluated and the edition dung controls.

Contains further information on charge control according to DIN 44574 T1 to T6 for example the "Taschenbuch für HEIZUNG + KLIMATECHNIK" (Recknagel, Sprenger, Schramek, Munich: Oldenbourg Industrieverlag, 2002, pp. 512-522, ISBN 3-486-26450-8). According to this, charging control can be used as forward control tion, as a spread control or as a reverse control. This Different types of charge control describe the timing of the Charge relative to the total available, usually longer Supply charging time: With forward control, the start of the ver care charging time and the start of charging are identical. With spread control the charging time is placed around the fictitious middle of the supply charging time.  

With the backward control, the time of the start of charging becomes so fixed that the charging has ended at the end of the supply charging period. The charge control is often implemented using microprocessors.

To ensure that you are always ready to load, even with flexible low tariff times the control signal itself must be continuously transmitted, received and be evaluated. This results in year-round electricity consumption for tax purposes.

The number of heating days is well below that in most regions of the world Number of days in a year. It is also not required in many applications derlich or even not wanted that the electric storage heaters loaded that will. This is the case, for example, in the absence of the Heating users from the heated object or in terms of heating technology to the over days falling or with heating periods contractually agreed in warmly rented properties.

The so-called standby consumption of electrical devices is currently being discussed. Even if the control signal and the associated power consumption are not falls under the precise definition "standby consumption", it is desirable Reduce power consumption at least if the with the Steuerstromver combined heat generation is not used for heating purposes. This especially applies to central control units that operate after the AC voltage system work, d. H. whose control signal in the storage heater of one ohm control resistor is processed further.

The structure and function of a charge control for storage heaters with weather sensors, central control unit and other devices is shown, for example, in DIN 44574, in particular in part 4 on page 2 and page 3 in Figures 1 and 2.

EP 0 530 727 B1 shows e.g. B. a storage heater with a charge controller, which receives a command variable (control signal) from a central control unit. The charge controller works thermomechanically or electronically. The one from charging In this arrangement, the control variable received by the controller is dependent on the outside temperature dependent and is routed via a weather sensor and a central control unit. The Storage heater has a motor-driven blower, whereby when switched on a fan in addition to a signal dependent on the outside temperature pensation signal is generated to erroneous control signals for the charging control compensation. The purpose of this compensation is to charge and recharge behave better at the actual heat content of the storage core of the heater device can be adjusted. This is to avoid disadvantages arising from the essentially only point-like geometry of a temperature sensor in the ver equal to the dimensions of the memory core.

In DE 195 30 775 A1 an arrangement is described for storage heating systems ben, which causes the earliest possible release of a recharge or recharge. A short switchback time is then required for the charge controller, after which the memory cherheizgerät is rechargeable, achieved in that a storage temperature sensor by a partial flow of the air flow discharging the storage heating systems is cool. The short switch-back time is independent of the outside temperature rature and regardless of a command variable from a central control unit aims. The storage tank temperature sensor is outside of the storage core in this surrounding thermal insulation layer arranged and thus captured the memory core temperature "reduced". To achieve a short switch-back time if the fan that discharges the memory core and at the same time the Storage tank temperature sensor cools, not switched on by a room temperature sensor is switched, a circuit can be provided that the fan when it occurs a release signal from an energy supply company (EVU) wise turns on for a limited time. In this way it should be achieved that even if the memory core is only static, that is, without leaving the room thermostat forced fan run, was discharged when a  EVU release signals of the charge controller by forcibly cooling the memory temperature sensor is reset.

DE 38 23 388 A1 is a charge for electrical space heating control known in which one during an unloading process from a The amount of heat removed from the memory is recorded. Each in a discharge heat output is used to determine one during each following charging the amount of heat to be supplied to the storage. The The amount of heat to be supplied also determines the beginning and the time course and the loading level of the following core loading process. To reach This functionality, the heater has an electronic data storage chereinrichtung in which during an unloading process with the help of a Sensor determined heat demand values can be read. This heat allowed values are converted by a computer into charge control signals.

Through installation and operating instructions for a charge control for Storage heaters ECU2 it is also known to be inside a closed one Arrange housing on the back of a circuit board switch, one of which one enables a control voltage to be switched off. This switch is from Hand operated at any time, but must be for proper Operation of the storage heater one hour before the calculated start of charging Hand be turned on again to ensure thermally correct conditions on and in Manufacture charge controller. In addition, this function can be known Charge control can only be used in special systems in which a contactor for switching a charging current via a special terminal in the known Charge control is switched. This charge control is therefore an on relationship of the aforementioned switch for the control voltage in an automati not intended and hardly possible.

The invention is based on the object for a storage heater with Zen central control unit to specify a charge control in which a reference variable, for example in the form of a control current after a charging process has been completed  is interrupted, provided that it is not used for heating purposes, and always right is reactivated early from reloading or reloading.

This object is achieved by the features of the Proverb 1. This ensures on the one hand that at outside temperatures, the more than an amount a above a so-called setting variable for one Charging start, no command variable from the central control unit to the charging regulator is delivered. On the other hand, the Füh is switched on again size already above the setting size set for the start of charging, so that at the actual start of charging in the charge controller thermally correct Ver conditions prevail, until then the release of the charge is suppressed. The combination of features according to the invention is in principle both with thermome can be used in both Chinese and electronic charge controllers.

In one embodiment according to claim 2, there is a temperature difference of 1 K. up to 3 K, preferably 2 K, are provided. A temperature difference, especially in the mentioned interval, can for example be permanently programmed into the routine. In further embodiments according to claims 3 and 4 are in the Zen control unit integrated additional setting routines with which the user or a relevant temperature difference from the installation level, especially is particularly adjustable in the range from 1 K to 3 K.

According to claim 5 it is provided that either or in the central control unit A year-round time switch with associated setting routines is also integrated. With the help of these setting routines, the user or the installer can pre-set from when to when the output control signal is not sent and / or the output for a charging contactor remains de-energized or a neutral one Contact is not switched through.

Instead of the all-year time switch is in an alternative solution according to claim 6 a routine was provided that averaged the almost 24-hour average of the outside temperature temperature with a built-in day timer or the average of the outside temperature  temperature with a built-in weekly timer averaged over several days. so soon this mean value the temperature set on a characteristic curve adjuster by a certain temperature difference is sent to a charging contactor contact no voltage output.

According to claim 7 it is provided that the central control device for further Optimizing power consumption falls into a sleep mode, in which, for. B. a displa y display is deactivated and / or further functions on the respective currently required scope can be reduced.

This can be according to claim 8 depending on the setting of a summer circuit z. B. also half an hour after pressing the last button for the Control signal output take place. When operating any adjustment device the sleep mode is temporarily canceled according to claim 9. The According to the invention, sleep mode is permanently canceled, so soon the display must show an error display.

The storage heater according to the invention is very advantageous because it guarantees continuous automatic operation a necessary for control and regulation purposes Power consumption minimized without restricting possible comfort requirements. This is achieved, among other things, by the fact that the central control unit electrical work done by the charge controller is reduced, and on the other hand one The charge controller does not heat up in periods without heating.

An exemplary embodiment of the invention is described below with reference to a drawing explained in more detail. Therein shows the only figure to explain the invention Functional process linked in a block diagram components of a charge control for a storage heater.

A weather sensor 1 is loaded at its input with an input variable x _{eF [° C]} . The input variable x _eF is the temperature at the weather sensor measuring point and serves as a measure of the heat demand of a storage heater until the start of a subsequent release of a charge. The weather sensor 1 processes the input variable x _eF to an output variable x _aF [Ω].

The output variable x _aF serves as the input variable x _e1 [Ω] of a central control unit 2 , which is loaded simultaneously by setting variables x _E1 [° C] and x _E2 [° C]. In the central control unit 2 , an all-year time switch 3 is integrated, the switching contacts of which the central control unit 2 puts in a corresponding manner to the respective prevailing season and for this desired and / or required switching state.

The central control unit 2 simultaneously communicates directly with a timing element 4 , which reports the times for a lowering time or for a discharging time to the central control device 2 depending on the input variables x _E3 [h] and x _E4 [h]. The timing element 4 is also supplied with a control voltage for runtime control via an input x _e2 [V]. On the output side, the central control unit 2 supplies a reference variable x _a1 [%].

The command variable x _a1 reaches a group control device 5 via a node K1 at its input x _e3 [%] and inputs x _e3 'and x _e3 ''from further group control devices not shown here. Each group control device 5 has an adjuster for x _E5 [%] for setting the charge of storage devices assigned to this group control device, only one of which is shown. At the output of group control unit 5 , a command variable x _a3 [%] appears, which deviates from x _a1 according to the input on adjuster x _E5 .

The command variable x _a3 is fed via a node K2 as input variable x _e4 [%] to a charge controller 6 and as input variable x _e4 'or x _e4 ''further charge controllers not shown here.

Group control devices 5 are required if, in the case of a plurality of the heaters to be controlled, different boundary conditions have to be met for individual groups of these heaters. Such boundary conditions are, for example, different comfort conceptions of the user or the location of the object to be heated in relation to the weather. With the same boundary conditions for all objects to be heated, for example in a family home, a group control unit 5 can therefore be omitted, so that the command variable x _{a1 is} in this case fed directly to the node K2 and from here as input variable x _{e4 to} an assigned charge controller 6 .

At the charge controller 6, an input possibility for a setting parameter x _E6 [%] for the charging of a memory core 8 is provided. The charge controller 6 is connected to a temperature sensor in the memory core 8 via an input x _e5 . The charging controller 6 generates a binary controller output signal x _a4 for switching the charging power P _{N of} the memory core 8 by evaluating the data entered. The charging power P _N supplied in the form of electricity is converted into heat in a heater 7 in the storage core 8 .

At an output x _{aW of} the memory core 8 , its current heat content is output via a value proportional to this in% of the full charge. In order to reduce the power consumption and to avoid undesired heating of the charge controller (s) 6 , the delivery of the command variable x _{a1 to} the central control device 2 is interrupted after the memory cores 8 have been charged, if the outside temperature x _{eF is} above the setting variable x _E2 . When the temperature value set via x _{E2 is reached} from higher temperatures, the heaters 7 of the storage cores would then briefly switch on because of the thermal inertia of the devices involved. This uncontrolled switch-on would not yet take place like the correct thermal conditions produced in the charge controller at this time.

In order to avoid this extremely undesirable high load on the network supplying the heating elements 7 , the characteristic curve for the temperature values set via x _{E2 is} increased according to the invention by an amount corresponding to a temperature difference a. This characteristic curve can be raised in a manner not shown by setting a fixed value in the central control unit 2 or via an actuator in the closed housing of the central control unit 2 or also via an actuator accessible from the outside on the central control unit 2 .

As a result of the increase in the characteristic curve for the start of charging, the temperature (x _E2 + a) is first reached when the outside temperature drops and, according to the invention, the command variable x _{a1 is} fed to the charge controller 6 directly or via the group control unit 5 as the input variable x _e4 . There, the correct thermal conditions have been established with certainty until the value x _{E2 is} reached when the temperature drops further and the suppression of the release of the charging is ended. This applies both to thermomechanical devices with an ohmic resistance in the charge controller and to electronic devices as charge controllers.

LIST OF REFERENCE NUMBERS

1

Outside sensor

2

Central control unit

3

Ganzjahresschaltuhr

4

timer

5

Group controller

6

charge controller

7

Heating for storage core

8th

memory core
K1 node
K2 node
x _eF

Input variable in [° C] for

1

x _aF

Output variable in [Ω] from

1

x _e1

Input variable in [Ω] for

2

x _E1

, x _E2

Setting values in [° C] for

2

x _E3

, x _E4

Setting values in [h] for

4

x _e2

Control voltage in [V] for

4

x _a1

Lead size in [%]
x _e3

Received with [%] in

5

x _E5

Adjuster with [%]

5

x _a3

Leading variable in [%]

5

x _e4

Leading variable in [%]

6

x _E6

Adjuster in [%]

6

x _a4

binary output signal from

6

P _N

Charging performance for

7

x _e5

Entrance at

6

x _aW

Heat content of

8th

Claims (11)

1. Method for charging control of a storage heater with a central control device ( 2 ), which is influenced by other devices, in particular by a weather sensor ( 1 ) and by a timer ( 4 ), at and below for a start of charging via a characteristic curve adjuster (E2) set temperatures (x _E2 ) for a charge controller ( 6 ) gives a reference variable (x _a1 ), the presence of which is necessary for charging, characterized in that the central control device ( 2 ) has the reference variable (x _a1 ) even at temperatures less than or equal (x _E2 + a), where a is positive and greater than zero, and that the charge controller ( 6 ) suppresses release of the charge at temperatures between (x _E2 + a) and x _E2 . 2. The method according to claim 1, characterized, that a is 1 ° K to 3 ° K, preferably 2 ° K. 3. The method according to claim 1 or 2, characterized, that the value of a by an installer using tools is adjustable. 4. The method according to claim 1 or 2, characterized in that the value of a on the central control unit ( 2 ) via a manually operable adjuster (E2) is adjustable. 5. The method according to any one of claims 1 to 4, characterized in that an additional year-round time switch ( 3 ) is provided in the central control unit ( 2 ), which enables activation and deactivation of the delivery of a command variable (x _a1 ) on predeterminable calendar days. 6. The method according to any one of claims 1 to 4, characterized in that in the central control device ( 2 ) the mean value of the outside temperature is determined for 24 hours or several consecutive days and that with a mean value above (x _E2 + a) a release the charging and the task of a reference variable (x _a1 ) is suppressed. 7. The method according to claim 6, characterized in that the central control device ( 2 ) falls at a mean value of the outside temperature above (x _E2 + a) into a sleep mode in which a screen display is deactivated and / or other functions on one currently required scope are limited. 8. The method according to claim 7, characterized in that the central control device ( 2 ) falls into sleep mode half an hour after pressing a button when summer mode is activated. 9. The method according to claim 7 or 8, characterized, that the sleep mode when operating any adjustment device is temporarily canceled.   10. The method according to claim 7 or 8, characterized, that sleep mode is permanently canceled when an error is displayed. 11. Storage heater with a central control device ( 2 ), a timer ( 4 ) and a charge controller ( 6 ) for performing a method according to one of claims 1 to 10.