# US 5,348,080 A · Latent heat storage apparatus and latent heat storage solution therefor

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- Number: US 5,348,080 A
- Document ID: US5348080A
- Status: Granted
- Kind: A
- Application number: 07/808,718
- Filed: 1991-12-17
- Granted: 1994-09-20
- Earliest claimed: 1990-12-19
- Assignees: The Tokyo Electric Power Company, Incorporated; Maekawa Mfg. Co., Ltd.; Asahi Denka Kogyo Kabushiki Kaisha
- Inventors: Syoichi Kuroda; Soichiro Shibata; Nonyuki Shimamura; Shigetake Kawasaki; Keisuke Kasahara; Seiichi Sakuma; Fujio Komatsu; Masaya Ishikawa; Kunio Sugiyama; Mitsuo Mashimo; Yuzuru Shindo; Kuniaki Kawamura
- Web page: https://patentgrep.com/patent/US5348080A

## CPC

- F25D 16/00: Devices using a combination of a cooling mode associated with refrigerating machinery with a cooling mode not associated with refrigerating machinery
- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- Y02E 60/14: Thermal energy storage
- F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A latent heat storage apparatus is provided and a latent heat storage solution therefor stores and retrieves a cool heat substantially in or from a latent heat thereof necessary for air conditioning, cooling, refrigerating, and so forth. The latent heat storage apparatus has an aqueous solution of a plurality of inorganic salts as a latent heat storage solution in a heat storage tank, formed to retrieve a cold heat from a stored latent heat, the latent heat storage apparatus. The latent heat storage solution is formed of (N-1) kinds of inorganic salts in at least an N-component aqueous solution where N.gtoreq.3. The latent heat storage solution stores the cold heat as the latent heat thereof. The cold heat is retrievable from the stored latent heat at a desired temperature almost invariably within a range higher than the N-component eutectic point and lower than any one of binary eutectic points of salts with water. The concentration of each inorganic salt in the aqueous solution is represented in a tortuous eutectic plane including ice point of the N-component equilibria diagram, wherein the concentration range allows the cold heat to be retrieved at the specified temperature almost invariably from the latent heat of ice, binary eutectics with water and inorganic salts, or separated substances.

## Claims

### Claim 1

A freezing cycle latent heat storage apparatus, comprising a compressor, a condenser operatively connected with said condenser, a heat storage tank, expansion valve operatively arranged between said condenser and said heat storage tank and an evaporator operatively arranged as a heat exchanger in said heat storage tank wherein said heat storage tank is communicated with a load via a circulation path, and a latent heat storage material in the form of an aqueous solution is stored in said heat storage tank, said latent heat storage material being an N (N.gtoreq.3) component system consisting of (N-1) inorganic salts with an eutectic point of no greater than -10.degree. C., and water, the eutectic concentration of one of said inorganic salts being in a range of 60 to 98%.

### Claim 2 (depends on 1)

The latent heat storage apparatus according to claim 1, wherein said latent heat storage material is a three component system having two different inorganic salts with common anions.

### Claim 3 (depends on 1)

The latent heat storage apparatus according to claim 1, wherein said latent heat storage material is a four component system having two different inorganic salts which do not contain a common anion.