NL8200316A - Central heating device. - Google Patents

Central heating device. Download PDF

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Publication number
NL8200316A
NL8200316A NL8200316A NL8200316A NL8200316A NL 8200316 A NL8200316 A NL 8200316A NL 8200316 A NL8200316 A NL 8200316A NL 8200316 A NL8200316 A NL 8200316A NL 8200316 A NL8200316 A NL 8200316A
Authority
NL
Netherlands
Prior art keywords
temperature
boiler
room
control unit
central control
Prior art date
Application number
NL8200316A
Other languages
Dutch (nl)
Original Assignee
Willempje Johanna Dogger Lam
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Willempje Johanna Dogger Lam filed Critical Willempje Johanna Dogger Lam
Priority to NL8200316A priority Critical patent/NL8200316A/en
Priority to NL8200316 priority
Publication of NL8200316A publication Critical patent/NL8200316A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1006Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009Arrangement or mounting of control or safety devices for water heating systems for central heating

Description

N.0. 30800 1 '* * »
Central heating system.
The invention relates to a central heating device for heating a number of rooms, provided with a boiler for supplying hot water via a pipeline network to radiators placed in the rooms to be heated.
Known central heating systems are equipped with a boiler, which is equipped with a boiler thermostat, which only serves to monitor the maximum boiler temperature. During the installation of the central heating system, this boiler thermostat is fixed at a predetermined boiler temperature.
10 In simple heating devices, a room thermostat is installed in one of the rooms to be heated by the heating device, which provides a signal that switches on the boiler burner if the temperature in the room monitored by the room thermostat falls below a temperature whereby the 15 room thermostat switches on, after which the burner switches off again when the temperature has risen to a level at which the room thermostat switches off. There is a considerable hysteresis between the switch-on and switch-off point of the room thermostat and, therefore, such a simple on-off control is rather coarse. The temperature in the room 20 where the room thermostat is located will still vary considerably with this control.
A further drawback of this method of control is that the temperature in the other rooms is directly dependent on the temperature in the room monitored by the room thermostat. Based on a constant outside temperature, it is theoretically possible to adjust the radiator valves of the radiators in the other rooms in such a way that these rooms will also be kept at a constant temperature. However, because the outside temperature is not constant and because further the loss of heat from the room to the outside through windows and doors and 30 through the outside walls, and the heat transport through the inside walls from one room to another, will form a very complex physical whole. in practice it is impossible to adjust a central heating device with such a simple on-off control such that each space 35 to be heated by the heating device has exactly the desired constant temperature.
A further known central heating device makes use of so-called thermostatic valves. In each room, at least one of the radiators, but preferably all radiators, is provided with an 8200316 * s> 2 thermostatic valve, which opens fully when the temperature drops below a predetermined temperature and when the temperature rises to a predetermined level again closes. If the temperature in a room falls below the level set on the thermostat tap, the tap will open so that hot water can be supplied by the boiler to the associated radiator. As soon as the temperature in the room has increased sufficiently again, the tap will close.
A drawback of such thermostatic valves is that they are very close to the associated radiator and are therefore quickly influenced by the heat released by the radiators.
As a result, even when using thermostatic valves, no smooth optimum temperature control in a room is achieved.
In both types of heating devices discussed above, a boiler is further used, the capacity of which is calculated in a known manner depending on the total radiator surface to be placed, the minimum outside temperature, the transmission losses from the inside to the outside of the various rooms, and so on. On the basis of such a calculation, the capacity of the boiler to be installed is then determined, which boiler must in any case be sufficiently large to also under conditions which may occur in an extreme situation, i.e. at very low outside temperature, a lot of heat loss, etc., to still be able to supply sufficient heat. In general, as a result, the capacity of the boiler will in fact be too great.
It is now known to also change the temperature set on the boiler thermostat depending on the outside temperature. The lower the outside temperature becomes, the higher the boiler thermostat temperature must be set. With such controls, however, it must be ensured that the capacity of the boiler is sufficiently large that, if hot water is to be supplied to all radiators at the same time, this water can also be supplied within an acceptable period of time. However, such a situation, which is inherent in the control method in an installation of the type discussed first, can also occur in an installation with thermostatic valves. With such a control, however, only the outside temperature is taken into account. If a number of rooms are not in use and the radiators in these rooms are closed, so that these rooms are not heated, the boiler capacity will still be too large despite this regulation, which depends on the outside temperature.
The fact that the boiler capacity is too large leads to 40 more energy being generated by the boiler, for example in the form of gas or oil, 8200316 -i.
3 is consumed than would be necessary in the optimal case.
The object of the invention is now to obviate these above-mentioned drawbacks and to provide a central heating device with which the temperature in each of the rooms to be heated by the heating device can be efficiently and economically maintained at a pre-desired level, wherein the the boiler's capacity is set to a value that arises depending on the current situation, so that the energy consumption of the entire installation is minimized.
This objective is met with a central heating device of the type mentioned in the preamble, because there is at least one valve per room for regulating the hot water supply to the relevant room, that a temperature sensor is present per room for measuring the temperature in the relevant room, that a temperature sensor is present for measuring the outside temperature, that a central control unit is present to which the signals from the temperature sensors are supplied, which central control unit is provided with input means via which a user can pre-set the temperature for each room. desired temperature for a predetermined period of time, after which, during operation, the central control unit, on the one hand, depending on the signals from the temperature sensors in the rooms, controls the valves present in the rooms concerned in such a way that the desired temperatures entered for the current time The temperature is maintained and, on the other hand, depending on the heat requirement per room and depending on the outside temperature, the temperature of the boiler water is regulated at such a level that the energy absorption of the boiler is minimized.
According to a preferred embodiment of the invention, the valve present per room is designed as a servo valve, which can be proportionally adjusted by the central control unit.
Preferably, the energy absorption of the boiler is minimized by measuring the duration of the periods in which the burner of the boiler is switched on in each case, that these measured durations are stored in the central control unit, which, based on a calculated average duration, the boiler water temperature in such a way that this average duration is minimized.
In the following, further advantages and features of the invention are further elucidated with reference to the accompanying figure, which schematically illustrates a number of parts 40 of a central heating device which are important for the invention.
8200316 J \ - 4
The accompanying figure shows schematically two spaces 1a and 1b to be heated by the central heating device. In each of these rooms there are one or more radiators that are intended to heat the rooms in question and these radiators are connected via 5 a valve 2a, 2b to the pipeline network, which is supplied with hot water by a boiler. In each of the spaces 1a, 1b, a temperature sensor 3a, 3b is present with which the temperature of the respective space 1a, 1b is measured.
The boiler, the pipeline network and the radiators are not shown in the figure, because the details thereof are assumed to be known to the skilled person.
It will also be clear that the number of spaces is not limited to two, but that any number of spaces can be connected to the central heating device according to the invention.
15 There is a boiler thermostat 4 on the central heating boiler, which switches off the boiler burner when the boiler water temperature set on the thermostat is reached. This thermostat is of a type that can be set to a variable temperature by an external signal. Furthermore, a temperature sensor 5 is arranged outside the spaces to be heated for measuring the outside temperature. The temperature sensors 3 and 5 may, for example, be provided with temperature-dependent resistors in a known manner.
All temperature sensors 3a, 3b ... and 5, like the valves 25a, 2b, ... and the boiler thermostat 4, are connected to the central control unit 6. This central control unit 6 is also connected to input means, for example on the shown designed as a keyboard 7 and with output means, for example in the form of a multi-digit display unit 8.
In the central control unit 6 there is a memory, a part of which is accessible to the user via the keyboard 7. With the aid of this keyboard 7, the user can set the desired temperature for each of the rooms 1 for a predetermined period, for example 35 room 1a: temperature 21 ° C between 8.00 and 23.00 temperature 15 ° C between 23.00 and 8.00
If the central control unit is provided with a clock unit such that a distinction can be made between the different days of the week, it is possible to program the temperature separately for each weekday using an adapted keyboard 40, for example 8200316 :
room lb: M to V between 8.00 and 18.00: temperature 21 ° C
between 0.00 and 8.00 and between 18.00 and 24.00 temperature 15 ° C
5 Sat and Sun between 0.00 and 24.00 temperature 15 ° C.
During programming, for example, the user receives feedback from the central control unit via the display panel 8, on which the programmed values are displayed. Furthermore, it is possible to make indications visible on this display panel to assist the user in programming the central control unit 6. During operation, the display unit 8 can for instance be used to continuously indicate the current time in hours and minutes.
If the central control unit is programmed by the user, the heater behaves as follows during operation.
In each of the spaces 1a, 1b, the temperature is measured with the aid of the temperature sensors 3a, 3b, etc. present for this purpose. In the illustrated example, each of these temperature sensors is separately connected to the central control unit. If a larger number of rooms are heated with a correspondingly larger number of temperature sensors, a multiplexer can for instance be used with which the temperature sensors are cyclically scanned by the central control unit 8.
The temperature measured by a temperature sensor is compared in the central control unit 8 with the temperature programmed for the room concerned and for the current time (possibly taking into account the day of the week). If the measured temperature is too low, the control unit 6 opens the valve 2 in the relevant room 1, so that hot water is supplied from the boiler via the pipeline network to the radiators in the relevant room, so that the temperature will rise in this space. When the temperature has reached the programmed value, valve 2 will be closed by the central control unit.
A separate control loop is thus created for each room via the central control unit 6, which ensures that the temperature in the associated room is kept as good as possible at the desired programmed value.
If valves of the on-off type are used, there will still be a variation of the temperature, within otherwise close to 8200316 * 6 limits. Even more precise and defined control is obtained if servo valves are used, which can be continuously controlled between fully open and fully closed.
5 The water to be supplied to the radiators in the various rooms under the control of the central control unit is heated in a boiler equipped with a burner and a boiler thermostat 4. This boiler thermostat 4 ensures that the burner is switched off when the boiler water has the boiler thermostat has reached the specified maximum temperature.
According to the invention, a boiler thermostat is now used, the temperature of which can be adjusted via a suitable signal. This can be, for example, a thermostat that can be set in steps, for example at 55 ° C, 65 ° C, 75 ° C, 85 ° C or 95 ° C. However, it is also possible to use a thermostat whose temperature is continuously adjustable, for instance via a servo mechanism, between, for example, 55 ° C and 95 ° C. If necessary, as indicated in the figure, a vehicle notification about the set temperature can take place from the thermostat 4 to the central control unit 6.
20 The central control unit continuously calculates the heat requirement of each room on the basis of the measured temperature and the programmed temperature for the room concerned. All these values, calculated separately for each room, together give the total heat requirement for the entire system. This calculated, required total amount of heat will have to be added by the boiler to the boiler water, so that the heat can be transported via the water to the various radiators.
It will be clear that the temperature of the boiler water must increase if the instantaneous total heat requirement increases, and that the boiler water temperature may decrease if the total instantaneous heat requirement decreases. The control unit 6 now controls the maximum boiler temperature set on the boiler thermostat such that, on the one hand, the instantaneous demand for heat can be met, while on the other hand the energy required for generating this heat is minimized.
Using calculation methods known per se, it is possible to indicate a maximum economic boiler temperature for each value of the total heat requirement. This relationship between heat requirement and boiler temperature can, for example, be entered or fixed-programmed for a number of routes 40 via the input means 7, after which the thermostat 4 is controlled in the manner described above on the basis of these values.
It is also possible to measure the energy absorption of the boiler by, for example, measuring the length of time during which the burner 5 is switched on each time. By means of the average ratio between the periods in which the burner is switched on and the periods in which the burner is not switched on, it is possible in a manner known per se to set the boiler temperature at such a value that this ratio is minimum is approaching. In that case, as described above, a step-adjustable thermostat can be used, but preferably in this case a continuously adjustable, for example servo-controlled, thermostat is used.
Because the central control unit 6 is pre-programmed with times and temperature values, it is possible for this control unit to take measures in anticipation of the coming energy need. For example, if the temperature is to be increased from 15 ° C to 21 ° C in a room at a predetermined time, for example at 08.00, then such a rise in temperature will require time. The central control unit can now continuously "look ahead" for 15 minutes, for example, and look up in the memory whether a temperature in one of the rooms should rise in 15 minutes. If this is the case, depending on the temperature difference to be bridged, the central control unit can open the valve 2 in the relevant room 25 earlier than at the programmed time, thereby achieving that at the programmed time the desired temperature has already been reached or in any case already being approached. The greater the temperature difference to be bridged, the sooner the central control unit must open the relevant valve. Correspondingly, it must of course also be ensured via the boiler thermostat control loop that the boiler thermostat is set at a suitable temperature corresponding to this temperature rise.
If a strong temperature rise were to take place in all rooms at the same or near the same time, the boiler would in fact have to supply a large amount of heat in a very short time. This means that the boiler should have a relatively high maximum heat capacity. In order to avoid this, it is now possible in the device according to the invention, when such a situation threatens to occur, which can be determined in advance by the central control unit 6, for a predetermined quantity. a number of rooms to enter a waiting period, as a result of which these rooms are brought up to temperature at a slightly later time, or to bring a predetermined number of rooms up to temperature earlier. By spreading the various temperature increases within an acceptable period of time, it is achieved that the amount of heat to be supplied by the boiler per time unit is reduced.
Although not indicated in the figure, it will be clear that the control device 6 can also supply signals to a pump present in the device with which the water is circulated through the pipeline network. This pump can be controlled by the control unit 6 in a known manner such that it is in any case switched on during the periods in which the burner is switched on as well as for a predetermined period of time after the burner has been switched off.
8200316

Claims (3)

  1. Heating device for heating a number of rooms, provided with a boiler for supplying hot water via a pipeline network to radiators placed in the rooms to be heated, characterized in that at least one valve is present for each room controlling the hot water supply to the relevant room, that a temperature sensor is present per room for measuring the temperature in the relevant room, that a temperature sensor is present for measuring the outside temperature, that a central control unit is present to which the signals from the temperature sensors are supplied, which central control unit is provided with input means via which a user can input the desired temperature for a predetermined period of time for each room, after which the central control unit, on the one hand, depends on operation on the one hand. depending on the signals from the temperature sensors in the rooms, the ones in the betr valves that are present in the room, regulates such that the desired temperature entered for the current time is maintained and, on the other hand, depending on the heat requirement per room and depending on the outside temperature, the temperature of the boiler water is regulated at such a level that the energy absorption of the boiler is minimized.
  2. 2. Heating device according to claim 1, characterized in that the at least one valve present per room is designed as a servo valve, which can be proportionally adjusted by the central control unit.
  3. 3. Heating device according to claim 1 or 2, characterized in that the duration of the periods during which the boiler burner is switched on is measured each time, that these measured periods of time are stored in the central control unit, based on a calculated average duration regulates the boiler water temperature in such a way that this average duration becomes minimal. *************** 8200316
NL8200316A 1982-01-28 1982-01-28 Central heating device. NL8200316A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL8200316A NL8200316A (en) 1982-01-28 1982-01-28 Central heating device.
NL8200316 1982-01-28

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8200316A NL8200316A (en) 1982-01-28 1982-01-28 Central heating device.
EP83200161A EP0085466A1 (en) 1982-01-28 1983-01-26 Central heating system

Publications (1)

Publication Number Publication Date
NL8200316A true NL8200316A (en) 1983-08-16

Family

ID=19839150

Family Applications (1)

Application Number Title Priority Date Filing Date
NL8200316A NL8200316A (en) 1982-01-28 1982-01-28 Central heating device.

Country Status (2)

Country Link
EP (1) EP0085466A1 (en)
NL (1) NL8200316A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838005C2 (en) * 1988-11-09 1991-12-05 Danfoss A/S, Nordborg, Dk
GB2456440B (en) * 2009-04-20 2009-12-09 Garry Richmond Stewart Secondary heating-system-controller with temperature-independent interruption means
JP2013088021A (en) * 2011-10-18 2013-05-13 Panasonic Corp Heat pump type hydronic heater
CN103759857B (en) * 2014-01-23 2016-08-17 北京鑫雅图科贸有限公司 A kind of material pipe heat tracing online monitoring system
CN107166504A (en) * 2017-04-18 2017-09-15 青岛海尔空调器有限总公司 Method of heating regulation and device
CN107270384A (en) * 2017-05-24 2017-10-20 青岛海尔空调器有限总公司 Method and device for heating regulation
CN110645629B (en) * 2019-08-13 2021-05-04 甘肃梦农物联网科技有限公司 Heating regulation method and equipment and computer readable storage medium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2855227C2 (en) * 1978-12-21 1982-04-15 Honeywell Gmbh, 6000 Frankfurt, De
PT69268A (en) * 1979-01-23 1979-02-28 Apparatus for producing bags of plastics material

Also Published As

Publication number Publication date
EP0085466A1 (en) 1983-08-10

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A1B A search report has been drawn up
A85 Still pending on 85-01-01
BV The patent application has lapsed