WO2001013056A1 - Latentkälte-speicherverfahren und latentkälte-speicher für ein kaltwassernetz - Google Patents
Latentkälte-speicherverfahren und latentkälte-speicher für ein kaltwassernetz Download PDFInfo
- Publication number
- WO2001013056A1 WO2001013056A1 PCT/DE2000/002269 DE0002269W WO0113056A1 WO 2001013056 A1 WO2001013056 A1 WO 2001013056A1 DE 0002269 W DE0002269 W DE 0002269W WO 0113056 A1 WO0113056 A1 WO 0113056A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil
- cold
- storage
- latent
- medium
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/023—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Definitions
- the present invention relates to a latent cold storage method and a latent cold storage for temperatures between 2 and 12 ° C.
- cold water in the range of 2-12 ° C is particularly necessary in air conditioning technology for cooling a large number of objects.
- cold water with a flow temperature of 6 ° C is used to cool buildings.
- Another application is in the chemical and food industries, where the cold water is required for product and storage cooling.
- the water is usually cooled using a suitable refrigeration machine.
- the additional use of storage systems can reduce energy costs because the generation of refrigeration can be shifted in part to the low tariff period of the power supply.
- the use of cold storage systems also enables the securing of a cold emergency supply as well as the covering of peak cold loads without a corresponding oversizing of the cooling machine.
- So-called ice storage systems which operate either with a direct cold transfer to the medium to be cooled or indirectly via an intermediate transport medium based on a brine. These ice or brine stores have a high storage density and can be realized with relatively low investment costs.
- temperatures of the transport medium used for charging from -5 ° C to -10 ° C are required.
- the use of these systems in cold water networks, in which the water itself is to be used as a transport medium for loading and loading, is therefore not possible.
- Salt solutions such as, for example, aqueous solutions of Glauber's salt, LiBr or LiCl
- Glauber's salt and other salts are too expensive to be used on a larger scale as storage material.
- these materials have the disadvantage that high-quality materials have to be used in their use.
- Another storage material that is very common in many temperature ranges is paraffin.
- DE 27 41 829 A1 discloses a latent heat store with a storage medium consisting of paraffin, in which the paraffin particles are encased in a plastic film and filled into a container through which water flows as a transport medium for the heat. This method of heat storage uses technical paraffins with a melting range between 30 and 60 ° C, which can be produced at low cost.
- paraffins are considered to have the disadvantage that their enthalpy of fusion is too low to be used reasonably for cold storage. Pure paraffins are therefore generally used for storing cold, but are very expensive due to their complex production process.
- the applicant is currently not aware of the use of paraffins for cold storage in a cold water network or in a refrigeration system which works with water as the refrigerant. This is due in particular to the fact that the paraffins available in the temperature range of 2-12 ° C. have a very small distance between them
- the present invention has for its object to provide a latent cold storage method and a latent cold storage, which enable cold storage between 2 and 12 ° C with low costs and high efficiency in a cold water network.
- the method according to the invention should furthermore be able to be used using existing storage facilities without major modifications.
- an n-tetradecane (C ⁇ 4 H 3 o) or an n-pentadecane (C ⁇ 5 H 32 ) of technical quality is used as the storage medium, which is separated by a partition from a volume for the cold transport medium.
- Transport medium is formed by the water of the cold water network or the refrigeration system and is passed directly past the partition to the storage medium for the release of cold (loading the storage medium) or for the absorption of cold (unloading the storage medium).
- the water In a charging cycle, the water is cooled to a temperature below the melting point of the storage medium in a refrigeration system, for example an absorption refrigeration system, before it passes through the store.
- the storage medium cools down with this water.
- heated water can be led past the now cooled storage medium in order to collect its stored cold. take or give heat to the cold storage medium.
- the partition between the storage medium and the water should consist of a sufficiently thermally conductive material.
- the latent cold storage according to the invention accordingly consists of one or more volumes for the storage medium, which are separated from a volume for the transport medium by a wall.
- the volume for the transport medium also has an inlet and an outlet.
- the storage medium in the latent cold storage according to the invention consists of technical grade n-tetradecane or n-pentadecane.
- technical quality means a purity of the specified paraffins of ⁇ 98%.
- the degree of purity of the n-tetradecane or the n-pentadecane of technical quality preferably ranges between 92% by weight and 98% by weight.
- n-tetradecane is preferably used for the range between 2 and 6 ° C and n-pentadecane preferably used for the temperature range between 8 and 12 ° C.
- n-tetradecane preferably used in the method according to the invention and the associated memory has a melting point of 4 ° C. and a solidification point of 2.5-4 ° C.
- Chillers or water-LiBr absorption chillers have so far generally only been operated up to chilled water temperatures of 4 ° C. At lower temperatures, the danger of freezing on the tube side was seen in the evaporator.
- the inventors of the present method and of the present cold store have found that, in particular while ensuring an approximately constant volume flow of the water through the
- Chiller even cold water temperatures of up to 1.5 ° C can be ensured in operation without causing the water to freeze. Additional antifreeze in the water is not necessary.
- n-tetradecane or n-pentadecane Due to the use of technical grade n-tetradecane or n-pentadecane, which are obtained as an intermediate product in the chemical industry and can therefore be purchased in large quantities and at low prices, the provision and operation of the storage device according to the invention is only comparatively low in cost connected.
- the proposed latent cold storage requires significantly smaller storage volumes than that previously used cold water storage systems used in the field of cold water networks.
- the volume is only about 1/3 to 1/5 of the volume of cold water storage tanks.
- the method according to the invention enables the use of ice storage systems available on the market, such as, for example, the ice ball system or the ice bank system, which are explained in more detail below, without major modifications.
- N-Tetradecan of technical quality is available in sufficient quantities and is available very inexpensively. The same applies to n-pentadecane.
- Substances are neither toxic nor aggressive and can be used in conjunction with PP and HDPE or standard materials.
- a particular advantage of the method presented and the memory presented is that it uses latent cold storage for thermal cooling processes, for example for water
- LiBr absorption chillers For this type of machine in particular, the use of cold stores is a great advantage to ensure better operating conditions.
- the proposed latent cold storage can be loaded with normal cold water without glycol additives.
- the direct integration into a cold water network is therefore Advantageously possible without further problems or measures.
- Safety measures can also be increased further by means of control measures, such as maintaining a constant volume flow through the refrigeration system.
- the already known ice storage systems, the ice ball system and the ice bank system are used to implement the method and the memory according to the invention.
- the storage material is filled into balls with a diameter of up to 10 cm. These balls have a small buffer volume to compensate for thermal changes in volume.
- the fillers known for ice and brine systems can be used here without any problems, since in ice / water systems
- the filled balls are filled into a container as a ball filling.
- Cold water flows through the ball bed as a transport medium, with the cold water depending on
- the filling bodies can also have a shape deviating from the spherical shape.
- the cold water is pumped through pipes that run in a larger volume or container that is filled with the storage medium. This freezes when the storage tank is loaded with cold water ⁇
- the integration of the latent cold storage according to the invention in a cold water network is explained in more detail using the exemplary embodiments.
- Sufficient control quality for the cold water flow temperature or the cold water return temperature is preferably ensured in accordance with the local conditions by using a charge or discharge pump in conjunction with suitable fittings.
- Temperature sensors are preferably provided at the inlet or outlet of the cold water from the cold store, which transmit the respective temperatures to a control device.
- the control device controls the charge or discharge pump as a function of this transmitted temperature in order to be able to ensure a constant flow or return temperature.
- Figure 1 shows an example of the integration of a
- Figure 2 shows another example of the integration of an embodiment of the latent cold storage in a cold water network
- Figure 3 shows a third example of the integration of an embodiment of the latent cold storage in a cold water network.
- the storage method according to the invention is explained using an embodiment based on the ice ball system. It goes without saying that all of the examples shown below can be applied analogously to the ice bank system.
- the connection to the cold water network is analogous to conventional ice storage technology.
- a charge pump, a control valve and a control valve are also used.
- the embodiment of the latent cold storage 1 shown in the three figures consists of a container 2 in which balls 3 filled with the storage material are filled.
- the container has an inlet and an outlet 4, 5, via which the cold water can flow into the container 2 or can flow out of it.
- FIG. 1 shows a hydraulic connection with the cold water network, in which the store 1 can be provided decentrally in the cold water network.
- Such an interconnection is particularly suitable for larger cold water networks or for a cold network in which no distinction is made between the cooling distributor and the cooling generator circuit.
- the cold water return 6, which has water at a temperature of 8-12 ° C., is connected to the supply or discharge via a discharge pump P1. ⁇ o 1 d ⁇
- ⁇ 4-> P d CM CQ 0 ( ⁇ N SH CQ 4-> ⁇ ⁇ 4-> ⁇ 4 -H TJ -H a -H i rH 4J
- FIG. 3 shows an example of implementation in which, owing to the low pressure losses within the store 1, there is no need for a charge or discharge pump.
- the area of application in turn concerns use in a refrigeration center.
- an exact setting of the cold water flow temperature is dispensed with.
- the storage system itself again consists of the same components with the same reference numerals as in the previous figures.
- the memory 1 is switched directly between the network supply 7 and the network return 6 without additional fittings.
- the charging and discharging process can be regulated by suitable control of the power of the cold water pump P3 of the evaporator circuit and the mains pump P4.
- the cold water supply temperature can be kept constant.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubricants (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU66837/00A AU6683700A (en) | 1999-08-16 | 2000-07-07 | Method for storing latent cold and latent cold storage device for a cold water network |
EP00954327A EP1204838A1 (de) | 1999-08-16 | 2000-07-07 | Latentkälte-speicherverfahren und latentkälte-speicher für ein kaltwassernetz |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19938725.7 | 1999-08-16 | ||
DE19938725A DE19938725C1 (de) | 1999-08-16 | 1999-08-16 | Latentkälte-Speicherverfahren und Latentkälte-Speicher für ein Kaltwassernetz |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001013056A1 true WO2001013056A1 (de) | 2001-02-22 |
Family
ID=7918506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/002269 WO2001013056A1 (de) | 1999-08-16 | 2000-07-07 | Latentkälte-speicherverfahren und latentkälte-speicher für ein kaltwassernetz |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1204838A1 (de) |
AU (1) | AU6683700A (de) |
DE (1) | DE19938725C1 (de) |
WO (1) | WO2001013056A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007059042A1 (de) | 2007-12-06 | 2009-06-10 | Bayerisches Zentrum für Angewandte Energieforschung e.V. - ZAE BAYERN - | Verfahren zum Einsatz schlecht kristallisierender Salzhydrate als Latentwärmespeichermaterial |
FR3012876A1 (fr) * | 2013-11-07 | 2015-05-08 | Air Liquide | Procede et appareil de refroidissement d’air destine a etre separe par distillation cryogenique |
EP3076111B1 (de) * | 2015-03-30 | 2020-12-09 | Viessmann Refrigeration Solutions GmbH | Fluidsystem und verfahren zum steuern eines fluidsystems |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2741829A1 (de) * | 1977-09-16 | 1979-03-22 | Dornier System Gmbh | Latentwaermespeicher |
GB2173886A (en) * | 1985-03-14 | 1986-10-22 | Mitsubishi Corp | Thermal energy storage and discharge system |
JPS6298193A (ja) * | 1985-10-25 | 1987-05-07 | Mayekawa Mfg Co Ltd | 蓄熱槽を有する冷水循環装置 |
JPH01163597A (ja) * | 1987-12-17 | 1989-06-27 | Toyobo Co Ltd | 蓄熱装置 |
EP0623662A1 (de) * | 1992-02-28 | 1994-11-09 | Mitsubishi Paper Mills, Ltd. | Mikrokapsel für Wärmespeichermaterial |
JPH06346047A (ja) * | 1993-06-08 | 1994-12-20 | Mitsubishi Cable Ind Ltd | 蓄熱材 |
EP0827997A1 (de) * | 1996-03-21 | 1998-03-11 | Nippon Shokubai Co., Ltd. | Wärmespeichernde verbindung und verfahren zu ihrer herstellung, wärmespeichernde material und verfahren zu ihrer herstellung und wärmespeicher. |
WO1998017960A1 (en) * | 1996-10-21 | 1998-04-30 | Thermal Energy Accumulator Products Pty. Ltd. | A temperature control system |
US5765389A (en) * | 1997-04-24 | 1998-06-16 | Ival O. Salyer | Cooling unit with integral thermal energy storage |
US5916478A (en) * | 1995-12-22 | 1999-06-29 | Osaka Gas Co, Ltd | Heat-accumulating microcapsule dispersion |
-
1999
- 1999-08-16 DE DE19938725A patent/DE19938725C1/de not_active Expired - Fee Related
-
2000
- 2000-07-07 AU AU66837/00A patent/AU6683700A/en not_active Abandoned
- 2000-07-07 WO PCT/DE2000/002269 patent/WO2001013056A1/de active Search and Examination
- 2000-07-07 EP EP00954327A patent/EP1204838A1/de not_active Withdrawn
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2741829A1 (de) * | 1977-09-16 | 1979-03-22 | Dornier System Gmbh | Latentwaermespeicher |
GB2173886A (en) * | 1985-03-14 | 1986-10-22 | Mitsubishi Corp | Thermal energy storage and discharge system |
JPS6298193A (ja) * | 1985-10-25 | 1987-05-07 | Mayekawa Mfg Co Ltd | 蓄熱槽を有する冷水循環装置 |
JPH01163597A (ja) * | 1987-12-17 | 1989-06-27 | Toyobo Co Ltd | 蓄熱装置 |
EP0623662A1 (de) * | 1992-02-28 | 1994-11-09 | Mitsubishi Paper Mills, Ltd. | Mikrokapsel für Wärmespeichermaterial |
JPH06346047A (ja) * | 1993-06-08 | 1994-12-20 | Mitsubishi Cable Ind Ltd | 蓄熱材 |
US5916478A (en) * | 1995-12-22 | 1999-06-29 | Osaka Gas Co, Ltd | Heat-accumulating microcapsule dispersion |
EP0827997A1 (de) * | 1996-03-21 | 1998-03-11 | Nippon Shokubai Co., Ltd. | Wärmespeichernde verbindung und verfahren zu ihrer herstellung, wärmespeichernde material und verfahren zu ihrer herstellung und wärmespeicher. |
WO1998017960A1 (en) * | 1996-10-21 | 1998-04-30 | Thermal Energy Accumulator Products Pty. Ltd. | A temperature control system |
US5765389A (en) * | 1997-04-24 | 1998-06-16 | Ival O. Salyer | Cooling unit with integral thermal energy storage |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 011, no. 316 (M - 631) 15 October 1987 (1987-10-15) * |
PATENT ABSTRACTS OF JAPAN vol. 013, no. 432 (M - 874) 27 September 1989 (1989-09-27) * |
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 03 28 April 1995 (1995-04-28) * |
Also Published As
Publication number | Publication date |
---|---|
EP1204838A1 (de) | 2002-05-15 |
AU6683700A (en) | 2001-03-13 |
DE19938725C1 (de) | 2000-06-15 |
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