EP0747642A1 - Heizung für Warmwasserspeicher - Google Patents

Heizung für Warmwasserspeicher Download PDF

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Publication number
EP0747642A1
EP0747642A1 EP96201587A EP96201587A EP0747642A1 EP 0747642 A1 EP0747642 A1 EP 0747642A1 EP 96201587 A EP96201587 A EP 96201587A EP 96201587 A EP96201587 A EP 96201587A EP 0747642 A1 EP0747642 A1 EP 0747642A1
Authority
EP
European Patent Office
Prior art keywords
water
reservoir
hot
storage heater
water storage
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.)
Granted
Application number
EP96201587A
Other languages
English (en)
French (fr)
Other versions
EP0747642B1 (de
Inventor
Johannes Albertus Hendrikus Willemsen
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.)
Heatex BV
Original Assignee
METAAL VRIES BV
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 METAAL VRIES BV filed Critical METAAL VRIES BV
Publication of EP0747642A1 publication Critical patent/EP0747642A1/de
Application granted granted Critical
Publication of EP0747642B1 publication Critical patent/EP0747642B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F24H9/12—Arrangements for connecting heaters to circulation pipes
    • F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
    • F24H9/133—Storage heaters

Definitions

  • the invention relates to a hot-water storage heater for heating and storing a buffer stock of hot water.
  • a mixing device For automatically admixing cold water during drawing off, a mixing device is used which is accommodated in the delivery pipe downstream of the hot-water storage heater. Also connecting to the mixing device is a cold-water supply pipe.
  • a drawback of this mixing device is that the costs thereof and of additional piping for connecting the mixing device are considerable. Further, the mixing device and the required additional piping take up space.
  • GB-A-1 142 404 discloses a hot-water storage heater according to the preamble of claim 1.
  • the first end forms the bottom end of the reservoir and the second end forms the top end of the reservoir.
  • cold water flows in via the supply channel.
  • the temperature of the water in the area of the mouth of the supply channel drops.
  • relatively cold water is added, via the further inlet adjacent the bottom end of the reservoir, to the hot water supplied from the top end of the reservoir, so that the temperature of the drawn-off water is reduced to the intended draw-off temperature. Because hot water of the set temperature from the top and cold water from the bottom are mixed, water of a constant temperature can be delivered for a relatively long time. Fixing a further inlet entails few costs and no propivions are required for mixing (unduly) hot water and cold water outside the reservoir.
  • a drawback of this known boiler is that if water is drawn off after no water has been drawn off for a longer period, the drawn-off water first has a temperature which is too high for too long a period. Inspite of the initially cooling effect of the pipes through which the water generally flows before it reaches the user - these pipes have cooled down after no hot water has passed for a longer period - this causes a considerable risk of the user suffering scalds, especially when suddenly, after an initial flow of water from the tap which is colder than desired, very hot water flows from the tap. If the user, by operating a mixing tap, has admixed cold water from the beginning, another problem presents itself in that the temperature of the water flowing from the tap, after being set, drops and should be readjusted. Especially when the user is having a shower and is in contact with the outflowing water over a large surface, the danger of scalds and the inconvenience of the above-mentioned drop of temperature are of particular importance.
  • hot-water storage heaters entail the problem that the water delivery decreases when they are installed and in operation for a longer time.
  • the object of the invention is to provide a hot-water storage heater wherein, in use, less hot water is delivered when water is being drawn off after no water has been drawn off for a longer time, wherein the delivery temperature increases less when the hot-water storage heater is installed and in operation for a longer time and wherein the water delivery at a given pressure decreases less over the life of the hot-water storage heater.
  • this object is realized by designing a hot-water storage heater of the above-described type in accordance with the characterizing part of claim 1.
  • the inlet for hot water from the top area of the heater and the further inlet for cold water from the bottom area of the heater interconnect adjacent the first, lower end of the reservoir, i.e. in the cool area of the reservoir avoids the effect that cold water to be admixed warms up in the delivery channel through heat exchange with the water in the portion of the reservoir through which the portion of the delivery channel with the water to be admixed extends.
  • water is drawn off after no water has been drawn off for a longer time, there is no initial admixture of a considerable plug of hot water instead of cold water to the unduly hot water from the top area of the reservoir, but cold or at least cool water from the bottom area of the reservoir is admixed immediately.
  • the hot water in the delivery channel located in the central area and the bottom area of the reservoir has cooled down slightly.
  • this relatively cool water is first mixed with the slightly warmed-up water in the bottom area of the reservoir.
  • the cold water in the cool area of the reservoir is admixed to the hot water further prevents the effect that through heat transfer from the hot water, the water in the delivery channel to the admixed is heated so that calcium precipitation or at least substantial calcium precipitation occurs in the delivery channel.
  • this calcium precipitation causes an increase of the flow resistance, so that in the end, less and less cold water can be admixed.
  • calcium precipitation resulting from water heating up in the delivery channel is prevented, so that the problem of a decrease of the water delivery after the heater has been installed for a longer time is prevented.
  • the hot-water storage heater according to the example shown in Figs. 1 and 2 comprises a closed reservoir or vessel 1 for storing water. Accommodated in the reservoir 1 is a heating element 2 for heating the water in the reservoir 1.
  • the heating element 2 of the hot-water storage heater shown is designed as a spirally extending pipe which can be connected to a heating boiler (for instance a boiler with which water of a central heating system is heated as well).
  • the pipe extends between two nozzles 3, 4 sealingly mounted in the wall of the reservoir.
  • the supply channel 5 is intended for supplying water to the reservoir 1 as indicated by the arrow 7.
  • the reservoir 1 For delivering water, as indicated by an arrow 8, the reservoir 1 comprises a delivery channel 9 having an inlet opening 10 adjacent the bottom side 11 of the reservoir 1, which bottom side 11 is located opposite the bottom 6.
  • the delivery channel 9 further has a further inlet opening 12 adjacent the bottom 6 of the reservoir 1.
  • this further inlet opening is shown schematically by a dot and dash line.
  • a sensor 20 of a thermostat which senses the temperature of the water above the heating element 2.
  • the sensor 20 is coupled to a control valve (not shown) controlling the supply of hot water to the heating element 2. In this manner, the maximum temperature of the water above the heating element 2 can be controlled in an accurate manner.
  • water adjacent the bottom 6 of the reservoir 1 When water is being drawn off from the reservoir 1 via the delivery channel 9, cold water flows into the reservoir adjacent the bottom 6, via the supply channel 5.
  • a part of the drawn-off water is formed by hot water of approximately the set temperature, which water has flown into the delivery channel 9 from a position adjacent the top side 11 of the reservoir 1, via the upper inlet 10.
  • Another part of the drawn-off water is formed by water which has flown into the delivery channel 9 from a position adjacent the bottom 6 of the reservoir 1, via the lower inlet 12.
  • water adjacent the bottom 6 of the reservoir 1 is cooler than the water adjacent the top side 11 of the reservoir 1.
  • the water adjacent the bottom 6 of the reservoir 1 is mixed with inflowing cold water as soon as water is being drawn off from the reservoir.
  • the draw-off temperature of the water from the hot-water storage heater is lower than the set temperature of the hot-water storage heater.
  • the hot-water storage heater can deliver hot water for a long time, because during drawing off, only a part of the water consists of hot water supplied from the top of the hot-water storage heater. The rest of the drawn-off hot water is colder water, which has remained in the hot-water storage heater only briefly.
  • the hot-water storage heater can deliver water of a fairly constant temperature for a long time.
  • the delivery channel 9 extends through a pipe 13 which extends from the bottom side 6 to a position adjacent the top side 11 of the reservoir 1.
  • the further inlet opening 12 is obtained in a very simple manner by providing a passage in the wall of the pipe 13, as appears most clearly from Fig. 2.
  • this passage can have any suitable shape, but it is preferably designed as a bore in the tube 13. The surface of the bore determines the ratio between the amounts of water passing through the upper inlet 10 and the further lower inlet 12 during drawing off, and, accordingly, the temperature of the drawn-off water.
  • a distributing surface 19 is mounted, directed approximately transversely to the supply channel 5.
  • the upper inlet opening 10 should preferably be located at a highest possible position and the lower inlet opening 12 should preferably be located at a lowest possible position.
  • a guideline which can be adopted is that these openings 10, 12, in installed condition and calculated from the lowest point of the bottom 6, should be located at a position higher than 90-95% and lower than 5-10% respectively of the height of the reservoir 1.
  • Fig. 3 shows a portion of an embodiment of the hot-water storage heater according to the invention, wherein the passage 12 is designed as a pasage 12 in a fitting 14 sealingly connecting to the tube 13. This fitting also projects through the bottom 6 of the reservoir 1 and is sealed relative to the bottom 6.
  • the embodiment according to Fig. 3 is provided with several passages to obtain a better mixing of the water in the delivery channel 9.
  • heating element a electric heating element (for instance a heating spiral) to which electric lines connect, can be used.

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)
  • Heat-Pump Type And Storage Water Heaters (AREA)
EP96201587A 1995-06-06 1996-06-06 Heizung für Warmwasserspeicher Expired - Lifetime EP0747642B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1000503A NL1000503C2 (nl) 1995-06-06 1995-06-06 Voorraadboiler.
NL1000503 1995-06-06

Publications (2)

Publication Number Publication Date
EP0747642A1 true EP0747642A1 (de) 1996-12-11
EP0747642B1 EP0747642B1 (de) 2001-09-05

Family

ID=19761121

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96201587A Expired - Lifetime EP0747642B1 (de) 1995-06-06 1996-06-06 Heizung für Warmwasserspeicher

Country Status (3)

Country Link
EP (1) EP0747642B1 (de)
DE (1) DE69614926T2 (de)
NL (1) NL1000503C2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592361A1 (de) * 2011-11-10 2013-05-15 Roth Werke GmbH Speicherbehälter aus Kunststoff für ein fluides Medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE150639C (de) *
GB906910A (en) * 1959-07-11 1962-09-26 Cyril Heathcote Hoare Improvements in hot water circulating apparatus
GB1142404A (en) 1966-02-01 1969-02-05 Gen Electric Improvements in liquid handling and dispensing apparatus
AU494217B2 (en) * 1975-05-20 1977-11-24 Rheem Australia Limited Improvements in storage water heaters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE150639C (de) *
GB906910A (en) * 1959-07-11 1962-09-26 Cyril Heathcote Hoare Improvements in hot water circulating apparatus
GB1142404A (en) 1966-02-01 1969-02-05 Gen Electric Improvements in liquid handling and dispensing apparatus
AU494217B2 (en) * 1975-05-20 1977-11-24 Rheem Australia Limited Improvements in storage water heaters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592361A1 (de) * 2011-11-10 2013-05-15 Roth Werke GmbH Speicherbehälter aus Kunststoff für ein fluides Medium

Also Published As

Publication number Publication date
NL1000503C2 (nl) 1996-12-09
EP0747642B1 (de) 2001-09-05
DE69614926T2 (de) 2002-04-11
DE69614926D1 (de) 2001-10-11

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