EP1687574A1 - Chaudiere amelioree - Google Patents

Chaudiere amelioree

Info

Publication number
EP1687574A1
EP1687574A1 EP04791618A EP04791618A EP1687574A1 EP 1687574 A1 EP1687574 A1 EP 1687574A1 EP 04791618 A EP04791618 A EP 04791618A EP 04791618 A EP04791618 A EP 04791618A EP 1687574 A1 EP1687574 A1 EP 1687574A1
Authority
EP
European Patent Office
Prior art keywords
elements
heating elements
boiler according
boiler
heating
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Withdrawn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
EP04791618A
Other languages
German (de)
English (en)
Inventor
Brian Hammond
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.)
Heatrae Sadia Heating Ltd
Original Assignee
Heatrae Sadia Heating 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 Heatrae Sadia Heating Ltd filed Critical Heatrae Sadia Heating Ltd
Publication of EP1687574A1 publication Critical patent/EP1687574A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/128—Preventing overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/215—Temperature of the water before heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/37—Control of heat-generating means in heaters of electric heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/407—Control of fluid heaters characterised by the type of controllers using electrical switching, e.g. TRIAC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based

Definitions

  • the present invention relates to electric boilers and improved means of controlling the activation of the heating elements within a boiler.
  • such electric boilers normally have a high heating output and consequently require a high energy input.
  • the high energy input is not required constantly but only when demanded by the temperature control system.
  • the drop in voltage can be so large that the output of, for example, light from an incandescent lamp can be temporarily reduced, by a level sufficient for the drop to be noticeable by the user. Furthermore, if the boiler is switched on and off several times in rapid succession, the resultant flickering of the lamp can be irritating. Moreover, regulations and International Standards set levels for an acceptable amount of flicker.
  • an electric boiler including a heat exchange unit comprising an inner volume wherein heating elements heat a transfer medium to a desired temperature, the unit having an inlet port and an outlet port through which the medium respectively enters and leaves the unit;
  • control means to govern the activation of the heating elements
  • switch elements to activate the heating elements and obtain the required loads.
  • the heating elements can be activated in a sequence determined by the control means, the sequence minimising flicker yet affording sufficiently rapid heating of the medium.
  • the switch element preferably comprises an electromechanical relay, which is highly durable.
  • the switch, element includes a triac which has no moving parts and so reduces the electrical noise produced during activation and deactivation of the elements.
  • the minimisation of electrical noise is encouraged by European Standards which set limits on the amount of radio frequency (RF) noise which is permissible.
  • RF radio frequency
  • a switching element comprises an electromechanical relay having a triac across the contact. The noise of the contact is therefore reduced.
  • the relay and triac are so configured that after current flow is initiated, the electromechanical relay is on, and the triac is off.
  • the elements are conveniently in banks each bank comprising elements sharing the same power rating.
  • the wiring for the arrangement is thereby simplified.
  • the power rating of the higher power element is an integer multiple of that of the lower power element. This arrangement facilitates stepwise increase and decrease of the power output of the elements.
  • the heating elements are activated or deactivated sequentially to produce a stepwise increase or decrease in the rate of heating.
  • the elements can be activated by a burst firing sequence, controllable by the control means.
  • the burst firing sequence allows the heating of the medium to be fine tuned.
  • the boiler includes temperature sensors at the inlet and outlet port.
  • the sensors relay the temperature to the control unit, which processes the data through an algorithm and determines the rate of flow of medium through the heat exchange.
  • the flow calculation can be used as a safety device. For example, where the temperature difference between the sensors is higher than a certain pre-set level, this indicates that the flow of medium is too low.
  • the elements can then be switched off to prevent localised overheating.
  • a heat exchange unit having an inner volume in which a fluid medium can be heated by means of heating elements and which the medium respectively enters and leaves the heat exchange unit; switching elements to activate the heating elements; a control means to govern activation of the heating elements, the heating elements including at least two elements having different power ratings.
  • Figure 1 is a diagram showing the operation of heating elements within a heat exchange unit.
  • the electric boiler (not illustrated) includes a heat exchange unit 10 to increase the temperature of water to a desired value.
  • the heated water can then go into, for example, a domestic hot water supply or central heating system.
  • the heat exchanger 10 has an input port 11 through which cold or cool water enters. After the water has been heated the water exits the exchanger 10 via the output port 12 which is connected to the taps or radiator system where the hot water is required.
  • heating elements 13 are provided. In the exemplified arrangement, the elements comprise two 1 Kilowatt
  • the elements are individually and collectively controlled by the control unit 14.
  • temperature sensors 15,16, connected to the control unit 14 are included at the input port 11 and output port 12 respectively.
  • the elements in the disclosed embodiment are capable, if activated correctly, of providing an output of up to 1 lkW in steps of 1WK. This is illustrated in Table 1 below in which the steps from OkW to 11KW are illustrated, with V indicating that the particular heater is active and X that it is inactive. It will be appreciated that elements having ratings different from 1KW can be used to achieve a stepwise change in heating and power consumption, without departing from the scope of the invention.
  • the user or boiler installer programs into the control unit 14, either directly or through a separate interface, the desired temperature of the output water.
  • the control unit 14 determines the energy required by processing the input, output and pre-set desired temperature through an algorithm and activates the heating elements accordingly.
  • the data from the temperature sensors can be used to determine the flow of water through the boiler and in particular across the heating elements. For example, should the temperature difference between the output water and the input water be higher than a pre-set value, then the control unit can be programmed to take this as an indicator that the flow rate of the water is too low. Power supplied to the heating elements can be reduced.
  • the heating elements are activated sequentially as illustrated above.
  • the sequence ensures that the change in energy requirements does not vary by more than lkW in each step.
  • Activation of an element will typically extend over a period of 1 Vz to 2 seconds.
  • the power within the IkW elements A,B can be further modulated by a technique known as burst firing.
  • burst firing the IkW element B is activated in short bursts so that smaller pockets of energy can be delivered to the water.
  • This technique is used primarily once the water has reached the desired temperature, normally from 40-90C. Typically, the element will be activated for only a few cycles per second.
  • the temperature of the water can be controlled to a higher degree of accuracy than would be the case if the power was adjustable in IkW blocks.
  • the burst firing sequence is normally controlled through an electronic circuit, governed by software and/or a microprocessor.
  • triacs are normally preferred to electromechanical relays.
  • triacs are not suitable as they themselves are a source of heat, this requiring cooling means.
  • triacs do not always behave in a consistent manner.
  • An arrangement is considered therefore which combines electromechanical relays and triacs. In this combination, a triac forms a bridge across the contacts of the relay.
  • the triac In order to turn the heating on, the triac is turned on. When current is flowing the electromechanical relay is turned on and the triac is turned off. When switching off heating, the triac is first turned on, the electromechanical relay turned off, then the triac turned off. These sequences also reduce the wear on the electromechanical relay contacts and prolongs the life of the relay. By switching the triac at the point in the a.c. cycle where the voltage is close to zero (a technique known as zero voltage crossover switching) electrical noise is minimised.

Landscapes

  • 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)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

L'invention concerne une chaudière électrique comprenant une unité d'échange thermique (10) dans laquelle un milieu de transfert thermique, généralement de l'eau, est chauffé. De l'énergie provenant du chauffage est transportée par l'intermédiaire d'éléments de chauffage (13), l'activation de ceux-ci étant commandée par des moyens de commande (14) mettant en oeuvre des commutateurs. Ceux-ci sont soit électrochimiques, des triacs, soit une combinaison de ceux-ci. Les éléments de chauffage (13) comprennent des éléments d'au moins deux puissances nominales différentes, des éléments de la même puissance étant combinés ensemble dans un bloc. La séquence d'activation des éléments de chauffage (13) est commandée de manière à minimiser la charge accrue soudaine appliquée sur l'alimentation du local dans lequel la chaudière est située. Afin de réduire le risque de chaleur excessive appliquée, les éléments peuvent être activés au moyen d'une séquence de déclenchement de salve dans laquelle la puissance est alimentée dans l'élément uniquement pendant une courte durée.
EP04791618A 2003-10-31 2004-10-29 Chaudiere amelioree Withdrawn EP1687574A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0325399.4A GB0325399D0 (en) 2003-10-31 2003-10-31 An improved electric boiler
PCT/GB2004/004581 WO2005045327A1 (fr) 2003-10-31 2004-10-29 Chaudiere amelioree

Publications (1)

Publication Number Publication Date
EP1687574A1 true EP1687574A1 (fr) 2006-08-09

Family

ID=29725679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04791618A Withdrawn EP1687574A1 (fr) 2003-10-31 2004-10-29 Chaudiere amelioree

Country Status (3)

Country Link
EP (1) EP1687574A1 (fr)
GB (1) GB0325399D0 (fr)
WO (1) WO2005045327A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9435565B2 (en) 2008-12-18 2016-09-06 Aos Holding Company Water heater and method of operating the same
WO2011144733A2 (fr) * 2010-05-21 2011-11-24 Nestec S.A. Élément chauffant en ligne couplé à double circuit dynamique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19504470B4 (de) * 1995-02-10 2004-03-04 BSH Bosch und Siemens Hausgeräte GmbH Elektrischer Durchlauferhitzer
US5699218A (en) * 1996-01-02 1997-12-16 Kadah; Andrew S. Solid state/electromechanical hybrid relay
GB0112097D0 (en) * 2001-05-18 2001-07-11 Newteam Ltd Electric shower

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005045327A1 *

Also Published As

Publication number Publication date
GB0325399D0 (en) 2003-12-03
WO2005045327A1 (fr) 2005-05-19

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