DK155296B - FLOW WATER HEAT HEATED BY DISPOSAL HEATING OR OTHER FLUID UNDER PRESSURE - Google Patents
FLOW WATER HEAT HEATED BY DISPOSAL HEATING OR OTHER FLUID UNDER PRESSURE Download PDFInfo
- Publication number
- DK155296B DK155296B DK006278AA DK6278A DK155296B DK 155296 B DK155296 B DK 155296B DK 006278A A DK006278A A DK 006278AA DK 6278 A DK6278 A DK 6278A DK 155296 B DK155296 B DK 155296B
- Authority
- DK
- Denmark
- Prior art keywords
- water
- heating medium
- valve
- district heating
- supply
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 68
- 238000010438 heat treatment Methods 0.000 title claims description 28
- 239000012530 fluid Substances 0.000 title 1
- 239000008236 heating water Substances 0.000 claims description 34
- 230000001105 regulatory effect Effects 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
-
- 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
- F24D10/00—District heating systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/17—District heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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)
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
Description
DK 155296 BDK 155296 B
Den foreliggende opfindelse angår en vandvarmer af gennemstrømningstypen og af den i indledningen til krav 1 5 angivne art. Normalt føres forbrugsvandet gennem en spi ral af kobberrør beliggende indfe i en udvendigt varme-isoleret beholder eller cylinder, som har til- og' adgang for fjernvarmevandet. Koldtvandstilgangen er forbundet med vandforsyningsnettet og varmtvandsafgangen 10 med en eller flere aftapningsventiler. I fjernvarmeledningen er indskudt en ventil, som kan være en termostatventil styret af en temperaturføler, der reagerer på den afkøling af fjernvarmevandet, som fremkommer, når der tappes varmt brugsvand. Denne regulering fore-15 går med en vis tidsforsinkelse, og i praksis foretrækkes det derfor at lade fjernvarmeventilen være styret af en i brugsvandledningen indskudt strømningsføler, som reagerer umiddelbart på en aftapning af varmt vand, både m.h.t. åbning og lukning. I en sådan regulerings-20 indretning kan strømningsføleren være indrettet til at udvirke enten en on-off-regulering af fjernvarmeventilen eller fortrinsvis en gradueret regulering deraf, svarende proportionalt til det øjeblikkelige vandforbrug. Strømningsføleren bør dog kunne tillade en ringe 25 strømning af brugsvand uden at åbne fjernvarmeventilen, nemlig således at f.eks. en dryppende aftapningsventil ikke bevirker konstant opvarmning af vandvarmeren med tilhørende spild af fjernvarmeenergi.The present invention relates to a water heater of the type of flow and of the kind specified in the preamble of claim 15. Normally, the consumable water is passed through a coil of copper tubes located inside an externally heat-insulated container or cylinder which has access and access to the district heating water. The cold water supply is connected to the water supply network and the hot water outlet 10 with one or more drain valves. Into the district heating line is a valve which may be a thermostat valve controlled by a temperature sensor which responds to the cooling of district heating water which results when hot tap water is drained. This regulation takes place with a certain time delay, and in practice it is therefore preferable to leave the district heating valve controlled by a flow sensor inserted in the user manual, which responds immediately to a hot water drain, both with respect to water. opening and closing. In such a control device, the flow sensor may be arranged to effect either an on-off control of the district heating valve or preferably a graduated control thereof, proportional to the instantaneous water consumption. However, the flow sensor should be able to allow a low flow of hot water without opening the district heating valve, such that e.g. a dripping drain valve does not cause constant heating of the water heater with associated waste of district heating energy.
I mange installationer vil forholdet være det, at fjern-30 varmevandet er underkastet et tryk, som er højere end vandtrykket i vandforsyningsnettet, og der består derfor en risiko for, at der ved lækage, f.eks. gennem- 2In many installations, the ratio will be that the district heating water is subjected to a pressure which is higher than the water pressure in the water supply network, and therefore there is a risk that in case of leakage, e.g. through- 2
DK 15 5 2 9 6 BDK 15 5 2 9 6 B
tæring, i varmeveksleren kan trænge fjernvarmevand ind i brugsvandledningen og derfra tilbage i vandforsyningsnettet, hvorved vandet i dette kan blive forurenet med fjernvarmevand. Det foreskrives derfor i stigende grad, 5 at vandvarmerne skal være sikrede mod denne risiko, hvilket på sin vis er let opnåeligt ved at anbringe en kontraventil i koldtvandstilgangen.corrosion, in the heat exchanger can penetrate district heating water into the utility water pipe and from there back into the water supply network, whereby the water in it can be contaminated with district heating water. It is therefore increasingly stipulated that the water heaters must be protected against this risk, which is easily achievable by placing a non-return valve in the cold water supply.
Imidlertid indføres der en ny risiko ved denne kontraventil i koldtvandstilgangen, nemlig at den vandmængde, 1 0 som er indeholdt i forbrugsvandledningen imellem kon-traventilem og aftapningsventilen eller-ventilerne ikke har mulighed for at udvide sig ved den opvarmning, som denne mængde normalt vil underkastes efter en aftapning er bragt til ophør, idet der herved gen-*15 nem kontraventilen vil være indstrømmet koldt vand, som nu opvarmes ved restvarmen fra fjernvarmevandet i varmeveksleren. I egentlige gennemstrømningvarmere er der tale om indespærringsrum, som er totalt fyldt med vand og har forholdsvis lille volumen, hvorfor 20 vandet generelt ikke vil kunne ekspandere uden at sprænge.' rørsystemet. Det er derfor fundet nødvendigt at forsyne brugsvandledningen i varmeveksleren med en sikkerhedsventil, som åbner, når trykket i den indespærrede, ekspanderende mængde af brugsvand overstiger 25 ét forudbestemt maksimum, og ydermere har det så været nødvendigt at rørforbinde udløbet fra denne sikkerhedsventil til kloaksystemet. Brugen af den nævnte kontraventil har således indebåret væsentlige yderligere installationsomkostninger for at sikre mod konsekven-50 serne af en mulig lækage i varmeveksleren.However, a new risk is introduced by this non-return valve in the cold water supply, namely that the amount of water contained in the consumption water between the check valve and the drain valve or valves does not have the opportunity to expand by the heating which this quantity will normally be subjected to. after a bottling is brought to an end, thereby through the check valve will be flowed cold water, which is now heated by the residual heat from the district heating water in the heat exchanger. In actual flow heaters, these are confined spaces which are totally filled with water and have relatively small volume, which is why the water generally will not be able to expand without bursting. ' pipework. Therefore, it has been found necessary to provide the utility water in the heat exchanger with a safety valve which opens when the pressure in the confined, expanding amount of domestic water exceeds one predetermined maximum, and furthermore it has been necessary to pipe the outlet of this safety valve to the sewer system. The use of said non-return valve has thus entailed significant additional installation costs to safeguard against the consequences of a possible leak in the heat exchanger.
Det er formålet med opfindelsen at angive en vandvarmer af den nævnte art, ved hvilken den nødvendige sikring kan opnås med enkle midler.SUMMARY OF THE INVENTION It is an object of the invention to provide a water heater of the kind in which the necessary protection can be obtained by simple means.
Opfindelsen bygger på den enkle erkendelse, at man i 3The invention is based on the simple realization that in 3
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tilfælde af en lækage kan sikre sig mod udtrængning af fjernvarmevand i koldtvandsnettet ved at hindre tilgang af fjernvarmevand og fortsat lade koldtvandstil-gangen være således åben, dvs. uden brug af en kontra-5 ventil, at vandet i vandvarmeren frit kan ekspandere efter lukning for aftapningen, hvorved den nævnte sikkerhedsventil kan undværes. Lukningen for tilgang af fjernvarmevand er umiddelbart opnåelig ved brug af en reguleringsindretning af den omtalte art, hvor en i 10 fjernvarmeventil anbragt fjernvarmetilgangen er styret af en strømningsføler i brugsvandledningen, således at der vil være spærret for indløb af fjernvarmevand, når der ikke finder aftapning sted; dog vil det tillige være nødvendigt at sikre mod indtrængning af fjernvar-15 mevand fra fjernvarmereturledningen, hvorfor man i denne ledning kan anbringe enten en kontraventil eller en reguleringsventil styret af nævnte strømningsføler på samme måde som ventilen i fjernvarmetilgangen.in the event of a leak, it can safeguard against the penetration of district heating water into the cold water network by preventing the supply of district heating water and continuing to leave the cold water supply thus open, ie. without the use of a counter-valve, the water in the water heater can freely expand after closing the drain, thereby avoiding the said safety valve. The closure for supply of district heating water is immediately obtainable by means of a control device of the type mentioned, wherein a district heating supply located in a district heating valve is controlled by a flow sensor in the utility water pipe, so that inlet of district heating water will be blocked when no bottling takes place. ; however, it will also be necessary to safeguard against penetration of district heating water from the district heating return line, so that either a check valve or a control valve controlled by said flow sensor can be arranged in the same way as the valve in the district heating supply.
I overensstemmelse hermed er vandvarmeren ifølge op-20 findelsen ejendommelig ved de træk, der er angivet i den kendetegnende del af krav 1. Så længe der ikke tappes vand fra denne vandvarmer vil der være spærret for tilgang af fjernvarmevand fra både tilgangs- og returledningen, og selvom koldtvandstilgangen tillader 25 udtrædning af vand og dermed den omtalte vandekspansion i normal brug, vil der således i tilfælde af en indre læk ikke kunne foregå en udstrømning af fjernvarmevand.Accordingly, according to the invention, the water heater is characterized by the features set forth in the characterizing part of claim 1. As long as no water is drained from this water heater, the supply of district heating water from both the inlet and the return line will be blocked. and although the cold water supply allows for the withdrawal of water and thus the mentioned water expansion in normal use, in the event of an internal leak, there will be no outflow of district heating water.
Når der tappes vand fra vandvarmeren vil fjernvarmeventilen åbnes, og det indtrængende fjernvarmevand vil-30 medrives af forbrugsvandet, således at lækagen hurtigt afsløres ved, at det aftappede varme vand er forurenet ved indblanding af fjernvarmevand.When water is drained from the water heater, the district heating valve will be opened and the penetrating district heating water will be entrained by the consumable water, so that the leak is quickly revealed by the bottled hot water being contaminated by mixing district heating water.
Ved opfindelsen opnås tillige, at en udvendig læ kage i den ydre beholder eller cylinder for fjernvarme-35 vand kun vil lække med fjernvarmevand under tryk, så 4The invention also provides that an external leak in the outer vessel or cylinder for district heating water will only leak with pressurized heating water, so that 4
DK 155296 BDK 155296 B
længe der foregår aftapning af varmt vand, idet tilgangsmulighederne for fjernvarmevandet ophæves, så snart aftapningen bringes til ophør.as long as hot water is bottled, the access possibilities for district heating water are canceled as soon as the bottling is stopped.
Opfindelsen forklares i det følgende nærmere under hen-5 visning til tegningen, der skematisk viser en gennemstrømningsvandvarmer ifølge en foretrukken udførelsesform for opfindelsen.The invention is explained in more detail below with reference to the drawing, which schematically shows a flow water heater according to a preferred embodiment of the invention.
Den viste vandvarmer 2 omfatter en yderbeholder 4 med en tilgang 6 for fjernvarmevand, der tilføres gennem 10 en ledning 8, og et udløb 10 forbundet til den med 12 betegnede returledning i fjernvarmesystemet. Inde i beholderen eller cylinderen 4 er monteret et kobberrør 14, der ved sin ene ende er forbundet til et forsyningsrør 16 for koldt vand og ved sin anden ende er 15 tilsluttet et varmtvandsrør 18, der igen er forbundet med en eller flere varmtvandsaftapningsventiler 20.The water heater 2 shown comprises an outer container 4 with an inlet 6 for district heating water supplied through 10 a conduit 8, and an outlet 10 connected to the return line 12 designated in the district heating system. Inside the container or cylinder 4 is mounted a copper pipe 14, which at one end is connected to a cold water supply pipe 16 and at its other end is connected a hot water pipe 18, which in turn is connected to one or more hot water drain valves 20.
I fjernvarmereturledningen 12 er anbragt en kontraventil 22, der tillader udstrømning fra, men ikke tilstrømning til beholderen 4. I koldtvandtilledningen 20 16 er anbragt en strømningsføler 24, som mekanisk el ler på anden måde registrerer en vandstrømning i ledningen 16, når der tappes varmt vand, uden at føleren 24 spærrer for vandgennemgang i hverken den ene eller den anden retning, når aftapning ikke finder sted.In the district heating return line 12 is arranged a check valve 22 which allows outflow from, but not inflow to the container 4. In the cold water supply 20 16 is placed a flow sensor 24 which mechanically or otherwise detects a water flow in the line 16 when hot water is drained. , without the sensor 24 blocking water passage in either direction when bottling does not occur.
25 Føleren 24 er forbundet, mekanisk eller på anden måde, med en reguleringsventil 26 indskudt i tilgangslednin-gen 8 for fjernvarmevand, således at denne ventil åbnes i afhængighed af, at føleren 24 registrerer en vandaftapning, og lukkes så snart aftapningen bringes til 30 ophør. Det er for opfindelsen uden betydning om reguleringen af ventilen 26 finder sted som en on-off-re-gulering eller som en regulering gradueret efter intensiteten af strømningen gennem føleren 24, uanset at dét sidste vil være at foretrække i praksis.The sensor 24 is connected, mechanically or otherwise, with a control valve 26 inserted in the inlet conduit 8 for district heating water so that this valve is opened depending on the sensor 24 detecting a water drain and closes as soon as the drain is stopped. . It is irrelevant to the invention whether the regulation of the valve 26 takes place as an on-off regulation or as a regulation graduated according to the intensity of the flow through the sensor 24, regardless of the latter being preferable in practice.
DK 155296 BDK 155296 B
5 I no mal brug vil føleren 24 bevirke, at fjernvarmevand føres til beholderen 4 så snart en vandaftapning påbegyndes, hvorved vandet opvarmes som ønsket og fjernvarmevandet føres til returledningen 12 gennem 5 kontraventilen 22. Når aftapningen ophører vil føleren 24 bevirke en fuldstændig lukning af reguleringsventilen 26,hvorefter der ikke kan trænge fjernvarmevand ind i beholderen 4 hverken gennem den lukkede ventil 26 eller gennem kontraventilen 22. Da føleren 24 ikke 10 spærrer for tilgangsrøret 16 vil det sidst indførte kolde vand i røret 14 efter aftapningens ophør frit kunne ekspandere ud i røret 16, efterhånden som det opvarmes af det i beholderen 4 sidst indførte fjernvarmevand.In normal use, the sensor 24 will cause district heating water to be sent to the container 4 as soon as a water drainage is started, thereby heating the water as desired and the district heating water is fed to the return line 12 through the 5 check valve 22. When the drainage ceases, the sensor 24 will cause a complete closing of the control valve. 26, after which no district heating water can enter the container 4 neither through the closed valve 26 nor through the check valve 22. Since the sensor 24 does not block the inlet pipe 16, the last cold water introduced into the pipe 14 after the end of the drain can freely expand into the pipe. 16 as heated by the last district heating water introduced into the container 4.
15 Hvis der skulle opstå en lækage i røret 14 inde i beholderen 4, vil fjernvarmevand under tryk kun kunne udtræde af røret 14, så længe der foregår aftapning af varmt vand, netop fordi der ellers er spærret for al tilgang af fjernvarmevand, og ved en. begyndende mindre 20 lækage vil dette alene afsløre sig ved, at det aftappede vand er forurenet med fjernvarmevand, medens det i røret 14 indtrædende fjernvarmevand ikke vil kunne opbygge et tryk, som er tilstrækkeligt til at sende fjernvarmevandet baglæns ud gennem tilgangsrøret 16 25 for det kolde vand.15 If a leakage should occur in the pipe 14 inside the container 4, pressurized district heating water will only be able to exit the pipe 14 as long as hot water is drained, precisely because otherwise all the supply of district heating water is blocked and at a . Initial minor leakage will only be revealed by the fact that the bottled water is contaminated with district heating water, while the district heating water entering the pipe 14 will not be able to build up a pressure sufficient to send the district heating water backwards through the cold pipe inlet 16 25 water.
Ved brugen af kontraventilen 22 vil det ydermere opnås, at der i tilfælde af lækage i ydervæggen af beholderen 4 hurtigt vil ske en trykaflastning i denne, og nyt fjernvarmevand under tryk vil kun blive tilført, så 30 længe der foregår aftapning af varmt vand, dvs. vandskaden ved det lækkende fjernvarmevand vil blive meget mindre end hvis der var fri mulighed for tilgang af fjernvarmevand fra returledningen 12.Furthermore, by the use of the check valve 22, it will be achieved that in the event of a leak in the outer wall of the container 4, a pressure relief in this will quickly occur, and new district heating water under pressure will only be supplied so long as hot water is drained, ie. . the water damage at the leaking district heating water will be much less than if there was free possibility of access of district heating water from the return line 12.
Det vil iøvrigt forstås, at kontraventilen 22 vil kunne 6It will be understood, moreover, that the check valve 22 will be capable of 6
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erstattes med en reguleringsventil styret af føleren 4 sammen med ventilen 26, da det blot skal sikres at fjernvarmereturledningen 12 er afspærret, når tilgangsventilen 26 er lukket. Det kan nævnes, at den omtalte opvarmning og ekspansion af det kolde vand i røret 14 vil modsvares af en afkøling og sammentrækning af fjernvarmevandmængden i beholderen 4, hvorved der kan opstå undertryk i denne. Imidlertid viser dette sig i praksis at være ganske uden betydning >is replaced by a control valve controlled by the sensor 4 together with the valve 26, since it only has to be ensured that the district heating return line 12 is shut off when the inlet valve 26 is closed. It may be mentioned that the mentioned heating and expansion of the cold water in the pipe 14 will be offset by cooling and contraction of the district heating water volume in the container 4, whereby there may be underpressure therein. However, in practice this proves to be quite unimportant>
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1122/77A GB1568527A (en) | 1977-01-12 | 1977-01-12 | Water heater units |
| GB112277 | 1977-01-12 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK6278A DK6278A (en) | 1978-07-13 |
| DK155296B true DK155296B (en) | 1989-03-20 |
| DK155296C DK155296C (en) | 1989-07-24 |
Family
ID=9716544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK006278A DK155296C (en) | 1977-01-12 | 1978-01-06 | FLOW WATER HEAT HEATED BY DISPOSAL HEATING OR OTHER FLUID UNDER PRESSURE |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS53111549A (en) |
| DE (1) | DE2801014A1 (en) |
| DK (1) | DK155296C (en) |
| FR (1) | FR2377586A1 (en) |
| GB (1) | GB1568527A (en) |
| NL (1) | NL7800347A (en) |
| SE (1) | SE7800299L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258878A (en) * | 1979-06-01 | 1981-03-31 | Pachtenbeke Ides A Van | Flue gas heat recovery system |
| GB2149071A (en) * | 1983-11-04 | 1985-06-05 | James Lee Mckenney | Thermal storage water heater |
| AT504761B1 (en) * | 2007-01-25 | 2008-10-15 | Herz Armaturen Gmbh | DEVICE FOR REGULATING THE TEMPERATURE OF WASTEWATER |
| GB2532259A (en) * | 2014-11-13 | 2016-05-18 | Rbm Spa | Heat interface unit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK115876B (en) * | 1964-02-22 | 1969-11-17 | V Overgaard | System for heating domestic water using district heating water and control unit for use at the system. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2202095B1 (en) * | 1972-01-18 | 1973-07-05 | Vaillant Joh Kg | Circulation water heater |
-
1977
- 1977-01-12 GB GB1122/77A patent/GB1568527A/en not_active Expired
-
1978
- 1978-01-06 DK DK006278A patent/DK155296C/en not_active IP Right Cessation
- 1978-01-11 SE SE7800299A patent/SE7800299L/en unknown
- 1978-01-11 NL NL7800347A patent/NL7800347A/en not_active Application Discontinuation
- 1978-01-11 DE DE19782801014 patent/DE2801014A1/en not_active Withdrawn
- 1978-01-11 FR FR7800679A patent/FR2377586A1/en active Granted
- 1978-01-12 JP JP158478A patent/JPS53111549A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK115876B (en) * | 1964-02-22 | 1969-11-17 | V Overgaard | System for heating domestic water using district heating water and control unit for use at the system. |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1568527A (en) | 1980-05-29 |
| FR2377586B1 (en) | 1983-11-18 |
| SE7800299L (en) | 1978-07-13 |
| DK6278A (en) | 1978-07-13 |
| FR2377586A1 (en) | 1978-08-11 |
| DE2801014A1 (en) | 1978-07-13 |
| JPS53111549A (en) | 1978-09-29 |
| DK155296C (en) | 1989-07-24 |
| NL7800347A (en) | 1978-07-14 |
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| PBP | Patent lapsed |