EP0034186A1 - Dispositif de chauffage a stockage d'eau chaude du type a circulation naturelle - Google Patents

Dispositif de chauffage a stockage d'eau chaude du type a circulation naturelle Download PDF

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Publication number
EP0034186A1
EP0034186A1 EP80900988A EP80900988A EP0034186A1 EP 0034186 A1 EP0034186 A1 EP 0034186A1 EP 80900988 A EP80900988 A EP 80900988A EP 80900988 A EP80900988 A EP 80900988A EP 0034186 A1 EP0034186 A1 EP 0034186A1
Authority
EP
European Patent Office
Prior art keywords
hot
water
temperature
hot water
heat exchanger
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
EP80900988A
Other languages
German (de)
English (en)
Other versions
EP0034186B1 (fr
EP0034186A4 (fr
Inventor
Tadashi Mitsubishi Denki Kabushiki Kaisha Yoshida
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0034186A1 publication Critical patent/EP0034186A1/fr
Publication of EP0034186A4 publication Critical patent/EP0034186A4/fr
Application granted granted Critical
Publication of EP0034186B1 publication Critical patent/EP0034186B1/fr
Expired 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/186—Water-storage heaters using fluid fuel
    • 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
    • F24H15/223—Temperature of the water in the water storage tank
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0271—Valves

Definitions

  • the present invention relates to an improvement in a hot-water storage type hot-water supply apparatus operating under a natural circulation principle.
  • the natural circulation force F is formulated as follows :
  • the temperature distribution of the hot-water in hot-water storage tank (3) of the conventional hot-water supply apparatus at the time of the boiling of the hot-water can be expressed by the diagram shown in Figure 2, revealing a temperature gradient wherein the low temperature water exists at the bottom of the tank in the initial stage of the hot-water storage, and the higher the level of the hot-water from the bottom of tank 3, the higher the temperature of the hot-water becomes. Therefore,'it has such defect that the volume of the high temperature hot-water available for practical use, i.e. the effective hot-water storage volume is less than the actual inner volume of the tank.
  • Figures 1 to 3 show a conventional hot-water supply apparatus wherein Figure 1 is a diagrammatical vertical sectional view of the apparatus as a whole, Figure 2 is a diagram showing the temperature distribution in the tank at the time of the boiling of the hot-water and Figure 3 is a diagram showing the variation in hot-water temperature at the time of its supply.
  • Figures 4 to 8 show one embodiment of a hot-water supply apparatus in accordance with the present invention in which Figure 4 is a diagrammatical vertical sectional view of the apparatus as a whole, Figure 5 is a vertical sectional view of the thermal valve in its closed state, Figure 6 is a vertical sectional view of the thermal valve in its opened state, Figure 7 is a diagram showing the temperature distribution in the tank at the time of the boiling of hot-water, and Figure 8 is a diagram showing the variation in hot-water temperature during its supply.
  • Figure 9 is a graph showing changes in the hot-water temperature during its supply for the conventional hot-water supply apparatus and the apparatus in accordance with the present invention.
  • the reference numeral (1) shows a water inlet orifice, (2) a hot-water supply orifice, (3) a hot-water storage tank, (4) a first circulation pipe, (5) a heat exchanger, (6) a burner or combustor, and (7) a second circulation pipe.
  • the present invention is characterized in the provision of a thermal valve (8) interposed in a circulation passage A at second circulation pipe (7) downstream of heat exchanger (5), thermal valve (8) operating such that when the temperature of the hot-water becomes high its opening area is enlarged and when the temperature of the hot-water becomes low its opening area is narrowed.
  • thermal valve (8) comprises an orifice plate (9) fixedly mounted to the inner wall of second circulation pipe (7) near the exit of the heat exchanger and having generally a hollow truncated conical shape, a pin abutting plate (10) fixedly secured to orifice plate (9), a coil spring seating plate (11) fixedly secured to orifice plate (9), a coil spring (14) laid on spring fixing plate (11) centrally thereof, a movable circular disc (13) secured to coil spring (14) at its top, a temperature feeler (12) fixedly secured to disc (13) and having thermal wax sealingly filled therein, and pin (15) protruded through temperature feeler (12) centrally thereof so as to be freely axially movable and having its upper end abutted against pin abutting plate (10).
  • the thermal wax sealed within temperature feeler (12) changes its state from the solid phase to the liquid phase or vice versa depending on the temperature of the hot-water, to expand or contract so that pin (15) is projected or withdrawn from or into temperature feeler (12) due to the equilibration of the force acting on movable plate (13) from spring (14) on the one hand and from temperature feeler (12) on the other hand.
  • temperature feeler (12) is urged upwards relative to spring abutting plate (11) as viewed in Figure 5 so that the area for the passage of the hot-water formed between the opening of conical-shaped orifice plate (9) and circular movable disc (13) is made small, whereby the circulation flow rate w is made small.
  • movable disc (3) moves downwards against the action of spring (14) as viewed in Figure 5 in the manner contrary to that abovesaid. Therefore, the flow passage formed between the opening of orifice plate (9) and movable disc (13) is made large as shown in Figure 6, whereby the circulation flow rate w is made large.
  • thermal valve (8) detects this tendency and operates so as to cause the flow area to be made small, thereby lowering the flow rate.
  • thermal valve (8) detects this tendency and operates to cause the flow rate of the hot-water to be increased.
  • the circulation flow rate w is maintained always substantially constant regardless of the hot-water volume accumulated within tank (3).
  • hot-water temperature Tout at the exit of heat exchanger (5) is controlled so as to be substantially constant by such operation of thermal valve (8).
  • the temperature distribution of the hot-water within the hot-water storage tank at the time of boiling is made to be substantially constant over the total height of the tank as shown in Figure 7, resulting in the hot-water accumulation within the storage tank being as effective as possible relative to its inner volume.
  • the hot-water supply apparatus since temperature Tout of the hot-water flowing through second circulation pipe (7) by natural circulation is kept substantially constant, the hot-water supply volume becomes (W - w) in substance. Therefore, as shown by the solid line Y in Figure 9, after the start of ignition (point c), it is possible to supply hot-water at a constant temperature for a longer period of time as formulated by the following equation :
  • the present invention has an effective hot-water accumulation volume larger than the inner volume of the hot-water storage tank.

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)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
  • Temperature-Responsive Valves (AREA)
  • Details Of Fluid Heaters (AREA)

Abstract

Un chauffe-eau de stockage d'eau chaude du type a circulation naturelle est destine a stocker de l'eau chaude obtenue a partir d'un reservoir de stockage d'eau (eau ou eau chaude) au fond par un premier tuyau de circulation, un echangeur de chaleur et un second tuyau de circulation dans un reservoir. Une vanne thermo electrique est montee dans le second tuyau de circulation du cote aval de l'echangeur de chaleur pour modifier sa section d'ouverture en reponse a la temperature de l'eau chaude de maniere a maintenir sensiblement constante la temperature de l'eau chaude provenant de l'echangeur de chaleur. Il en resulte que la distribution de temperature au moment ou l'eau bout dans le reservoir de stockage d'eau est rendue sensiblement constante instantanement de maniere a augmenter la quantite effective d'eau chaude stockee. De plus, la temperature de l'eau chaude est maintenue constante sans fluctuation independamment du fonctionnement repetitif arret/marche d'un bruleur, et ne subit pas de variation meme si le bruleur fonctionne lorsque l'eau chaude est fournie. Au contraire, le temps pendant lequel l'approvisionnement continu en eau chaude est assure a temperature constante est prolonge permettant ainsi d'avoir une quantite effective d'eau chaude superieure au volume interne du reservoir de stockage d'eau.
EP80900988A 1979-06-01 1980-12-15 Dispositif de chauffage a stockage d'eau chaude du type a circulation naturelle Expired EP0034186B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6859079A JPS55160253A (en) 1979-06-01 1979-06-01 Natural circulation and reservoir type hot water feeder
JP68590/79 1979-06-01

Publications (3)

Publication Number Publication Date
EP0034186A1 true EP0034186A1 (fr) 1981-08-26
EP0034186A4 EP0034186A4 (fr) 1981-10-13
EP0034186B1 EP0034186B1 (fr) 1984-07-04

Family

ID=13378153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80900988A Expired EP0034186B1 (fr) 1979-06-01 1980-12-15 Dispositif de chauffage a stockage d'eau chaude du type a circulation naturelle

Country Status (7)

Country Link
EP (1) EP0034186B1 (fr)
JP (1) JPS55160253A (fr)
AU (1) AU519498B2 (fr)
BE (1) BE883550A (fr)
DE (1) DE3047559C2 (fr)
GB (1) GB2070210B (fr)
WO (1) WO1980002737A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0440Y2 (fr) * 1985-06-14 1992-01-06
CN106168410A (zh) * 2016-08-19 2016-11-30 广东万家乐燃气具有限公司 一种防水温波动的燃气热水器
CN113551427B (zh) * 2021-07-20 2022-07-12 珠海格力电器股份有限公司 热水器的控制方法、装置、热水器及存储介质
CN115200222B (zh) * 2022-07-22 2023-11-24 广东纽恩泰新能源科技发展有限公司 一种热水器控制方法、热水器、设备及存储介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB282075A (en) * 1926-12-13 1928-08-02 British Thomson Houston Co Ltd Improvements in and relating to water heaters
US2076087A (en) * 1936-04-18 1937-04-06 United American Bosch Corp Water heater
GB607962A (en) * 1944-08-17 1948-09-08 Lionel John Courtenay Improved hot water generating and storage system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE275152C (de) * 1912-08-24 1914-06-13 Heizkörper für Zentralheizungen mit durch das abfliessende Heizmittel beeinflusstem Thermostaten
DE7115699U (de) * 1971-04-23 1971-09-23 Siemens Ag Elektrischer Warmwasserspeicher
JPS526847U (fr) * 1975-07-02 1977-01-18
JPS52158951U (fr) * 1976-05-27 1977-12-02

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB282075A (en) * 1926-12-13 1928-08-02 British Thomson Houston Co Ltd Improvements in and relating to water heaters
US2076087A (en) * 1936-04-18 1937-04-06 United American Bosch Corp Water heater
GB607962A (en) * 1944-08-17 1948-09-08 Lionel John Courtenay Improved hot water generating and storage system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8002737A1 *

Also Published As

Publication number Publication date
DE3047559T1 (fr) 1982-02-18
BE883550A (fr) 1980-09-15
EP0034186B1 (fr) 1984-07-04
AU5985780A (en) 1980-12-22
JPS55160253A (en) 1980-12-13
DE3047559C2 (de) 1987-10-08
EP0034186A4 (fr) 1981-10-13
GB2070210B (en) 1983-05-18
AU519498B2 (en) 1981-12-03
WO1980002737A1 (fr) 1980-12-11
GB2070210A (en) 1981-09-03

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