EP1672287A1 - Verfahren zur Reglung der Vorlauftemperatur - Google Patents

Verfahren zur Reglung der Vorlauftemperatur Download PDF

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Publication number
EP1672287A1
EP1672287A1 EP04394074A EP04394074A EP1672287A1 EP 1672287 A1 EP1672287 A1 EP 1672287A1 EP 04394074 A EP04394074 A EP 04394074A EP 04394074 A EP04394074 A EP 04394074A EP 1672287 A1 EP1672287 A1 EP 1672287A1
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EP
European Patent Office
Prior art keywords
temperature
boiler
action
feed
pipe
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04394074A
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English (en)
French (fr)
Inventor
Stephen Grant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alley Enterprises Ltd
Original Assignee
Alley Enterprises Ltd
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 Alley Enterprises Ltd filed Critical Alley Enterprises Ltd
Priority to EP04394074A priority Critical patent/EP1672287A1/de
Publication of EP1672287A1 publication Critical patent/EP1672287A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating

Definitions

  • the present invention relates to a method for controlling at least the temperature in a feed pipe of an enclosed pressurised water heating system of the type comprising heat exchangers connected to a boiler having a feed water outlet connected to a feed pipe, at least some of which feed pipe is provided by a pipe of a thermoplastics material and a return inlet for cooled system water from a return pipe. Further, the invention relates to a computer program for carrying out such a method and further relates to a control system for carrying out such a method.
  • thermoplastics material for such pipe, not alone on the basis of cost, but also because of its general flexibility and the ability to bend the pipe easily without the necessity of complex bending equipment, as is required, for example, with metal pipes.
  • Such thermoplastics pipe is additionally much less expensive than, for example, copper piping. It is also easier to fit and generally is much more attractive to installers.
  • thermoplastic pipes in heating systems, such as, for example, British Standard Specification No. BS 7291.
  • thermoplastics pipe can fail if the temperature in the pipe exceeds a critical temperature. Not alone can they fail if this critical temperature is exceeded but they can fail if a lower critical temperature is maintained in the thermoplastics pipe over an extended period. While most boilers are fitted with thermostats that ensure the temperature will not exceed a preset amount, unfortunately during start-up and indeed during operation of the boiler when the boiler is cut off and then started again, the water temperature can be momentarily exceeded. In other words, the actual temperature of the water leaving the boiler might exceed a critical temperature, but for a very short period of time and as such, would not cause difficulties. However, when the temperature of the feed water exceeds some critical temperature for an extended period, then failure of the thermoplastics pipe can occur, particularly where the thermoplastics pipe is connected to a metal fitting such as, for example, feeding a radiator or other heat exchanger.
  • the effect of failure can, in some case, be catastrophic because the system may be operating at a pressure of the order of 3 bar or, in some cases, more, and then the escaping water can often flash off as steam and can cause considerable injury, let alone damage to the surrounding structure.
  • thermoplastic pipes there have been so many accidents and difficulties in relation to such thermoplastic pipes.
  • certain companies and organisations have refused to maintain domestic central heating systems using thermoplastics pipes as serious accidents and failures have occurred as the pipes have deteriorated over time.
  • the problem is that heretofore no efficient control system has been developed to allow the boilers to operate satisfactorily and at the same time to protect the thermoplastic piping.
  • the present invention is directed towards overcoming the problems in the use of thermoplastic piping in such heating systems.
  • a method for controlling at least the temperature in a feed pipe of an enclosed pressurised water heating system comprising heat exchangers connected to a boiler having a feed water outlet connected to a feed pipe, at least some of which feed pipe is provided by a pipe of a thermoplastics material and a return inlet for cooled system water from a return pipe, the method comprising, on the system operating:
  • an action database of critical temperatures exceeding the base temperature and corresponding instructions for action to be taken is prepared and the decision for action on a specific critical temperature being measured is taken having regard to the corresponding instruction for action in the database. It is very useful to have such a database because many different actions can be taken.
  • the action taken is to shut down the boiler for a predetermined time.
  • the action comprises one or more of:
  • the temperature of the exterior of the feed pipe is measured.
  • the temperature of the exterior of the feed pipe is measured adjacent the feed pipe of thermoplastics material nearest the feed water outlet.
  • the initial step is performed of preparing an action database of critical temperatures exceeding a base temperature and corresponding instructions for action to be taken having regard to the critical temperature and the elapsed time during which the critical temperature was maintained, then on the measured temperature exceeding the critical temperature:
  • the length of time each occurrence when a critical temperature occurred in the water heating system over an extended period is aggregated and if this exceeds a preset aggregate time, appropriate action is taken.
  • the pressure of the feed water is measured and when it falls outside a preset range, the boiler is shut down.
  • the method may be carried out using a computer program comprising computer instructions for carrying out the method, which computer program may be embodied on a record medium, a computer memory, a read only memory or an electrical signal carrier.
  • control system comprises:
  • the controller comprises an analog to digital converter (ADC) connected to the thermistor and an arithmetic logic unit (ALU) and associated timer.
  • ADC analog to digital converter
  • ALU arithmetic logic unit
  • the switch is a relay connected to the power input of the boiler.
  • thermoplastic pipe that causes the problem but that critical temperature being exceeded over a period of time.
  • Most thermoplastic pipes are able to withstand quite high temperatures over relatively small periods of time but will rapidly deteriorate at much lower temperatures if that lower temperature is maintained over a long period of time.
  • the water heating system 1 comprises a boiler 3 having a water outlet 4 and a water inlet 5.
  • the water outlet 4 feeds a feed pipe comprising a feed pipe 6 of metal connected by a pipe connector 7 to a further feed pipe 8 of thermoplastics material.
  • the feed pipe 8 in turn feeds in conventional manner, for example, a heat exchanger, in this embodiment, a radiator 9.
  • the return inlet is in turn fed from a return pipe 10. All of this is conventional.
  • the controller 2 comprises a conditioner 16 connected to the thermistor 15 and then to an analog to digital converter (ADC) 17 and from thence to an arithmetic logic unit (ALU) 18. Connected also in the system is a timer 19. The ALU 18 is connected to a relay 19 in a power feed line 20 to the boiler 3. Any other type of controller could be used.
  • ADC analog to digital converter
  • ALU arithmetic logic unit
  • a database is prepared of critical temperatures and times which will cause an action to be taken, usually to cause the relay 19 to operate and cut off the boiler.
  • the boiler may be cut off permanently, it may be simply cut off for a short period of time, but if the boiler were to exceed the critical temperature again within an extended period, then the boiler might be shut off.
  • the boiler could be controlled. It is envisaged, for instance, that what effectively is done is that the thermistor, which is mounted on the outside of the feed pipe 6, will measure the temperature of the feed water, which temperature will then be fed to the ALU 18 which will take the appropriate action. Generally, there will probably be a database of temperatures and times. Thus, for example, if a particular temperature was exceeded for five minutes in the pipe, the boiler might be shut off. Similarly, if a higher temperature was sensed, the boiler might be shut off after one minute. Indeed, if a higher critical temperature was exceeded, the boiler might be shut off immediately.
  • various recording means may be provided such that when the critical temperature is exceeded in a water heating system over a number of short intervals of time, these short intervals of time could be aggregated and if the aggregate of these times exceeded a critical aggregate time in that period, the boiler could also be shut off or some other action could be taken.
  • the thermistor obviously measures the temperature on the outside of the pipe and the temperature and indeed the control system used, will depend entirely on the actual thermoplastics material being used and indeed on the water heating system itself. Indeed, one could envisage a system where the first portion of the heating system might consist of metal piping and the thermoplastic piping might not be connected for the first part of the system. In this way, the water heat would be sufficiently dissipated as not to provide surges in temperature and indeed critical temperatures within the thermoplastics piping which might cause inadvertent operation of the control system. Indeed, the manner in which the system will be controlled will be dependent almost entirely on the type of system.
  • thermoelectric device any other temperature sensing device could be used, other than a thermistor, however, a thermistor is particularly advantageous in that it can be easily fitted to the exterior of a pipe.
  • the pressure of the feed water may be measured and when it falls outside a preset range, the boiler is shut down.
  • One of the major causes of serious conditions and failures in such water heating systems occurs when the amount of water in the system falls to a dangerously low level. What then happens is that the boiler has relatively little water and then generates an amount of steam which is then delivered out of the boiler and in certain instances, if the boiler runs dry and subsequently water is added to the boiler, a serious explosion or mishap can occur. It will be appreciated that it is of vital importance to ensure than when the level of the water falls low in the system, then system shuts down.
  • some form of pressure sensor may be mounted in the feed water pipe adjacent the exit to the boiler and indeed, in conjunction with a temperature probe or temperature measuring device, to measure both the pressure of the feed water and also the temperature. Then, when the feed water falls outside a preset range, the boiler can be shut down. In many instances, it may be a drop in pressure that is more important than an increase in pressure.
  • the method of the invention may be carried out by any program device and may use, for example, computers or may be embodied in a computer program, either on a record medium, in a computer memory, in a read only memory or on an electrical signal carrier.
  • a computer program can have program instructions to carry out the methods of the present invention.
  • the computer can be embodied in a record medium, stored in a computer memory, embodied in a read only memory and/or carried on an electrical signal carrier.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Temperature (AREA)
EP04394074A 2004-12-20 2004-12-20 Verfahren zur Reglung der Vorlauftemperatur Withdrawn EP1672287A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04394074A EP1672287A1 (de) 2004-12-20 2004-12-20 Verfahren zur Reglung der Vorlauftemperatur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04394074A EP1672287A1 (de) 2004-12-20 2004-12-20 Verfahren zur Reglung der Vorlauftemperatur

Publications (1)

Publication Number Publication Date
EP1672287A1 true EP1672287A1 (de) 2006-06-21

Family

ID=34932013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04394074A Withdrawn EP1672287A1 (de) 2004-12-20 2004-12-20 Verfahren zur Reglung der Vorlauftemperatur

Country Status (1)

Country Link
EP (1) EP1672287A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2159495A1 (de) * 2008-08-25 2010-03-03 Honeywell Technologies Sarl Steuergerät für ein Temperatursteuersystem
CN105783083A (zh) * 2016-05-06 2016-07-20 唐山现代工控技术有限公司 一种利用二次网压力调节热力站循环泵的方法及装置
CN110471318A (zh) * 2019-06-26 2019-11-19 康美药业股份有限公司 一种制药发热炉的智能控制系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838715A1 (de) * 1988-04-13 1989-10-26 Landis & Gyr Ag Heizungsregler
EP0662589A1 (de) * 1994-01-06 1995-07-12 Caradon Ideal Limited Steuerungssystem für Kessel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838715A1 (de) * 1988-04-13 1989-10-26 Landis & Gyr Ag Heizungsregler
EP0662589A1 (de) * 1994-01-06 1995-07-12 Caradon Ideal Limited Steuerungssystem für Kessel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2159495A1 (de) * 2008-08-25 2010-03-03 Honeywell Technologies Sarl Steuergerät für ein Temperatursteuersystem
CN105783083A (zh) * 2016-05-06 2016-07-20 唐山现代工控技术有限公司 一种利用二次网压力调节热力站循环泵的方法及装置
CN110471318A (zh) * 2019-06-26 2019-11-19 康美药业股份有限公司 一种制药发热炉的智能控制系统

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