# US 9,518,787 B2 · Thermal energy storage system comprising a combined heating and cooling machine and a method for using the thermal energy storage system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,518,787 B2
- Document ID: US9518787B2
- Status: Granted
- Kind: B2
- Application number: 14/439,786
- Filed: 2013-11-01
- Published: 2015-10-15
- Granted: 2016-12-13
- Earliest claimed: 2012-11-01
- Assignees: Skanska Svergie AB
- Applicants: Skanska Sverige AB
- Inventors: Hans Pilebro; Tobias Strand; Rasmus Vestin
- Web page: https://patentgrep.com/patent/US9518787B2

## CPC

- F28D 20/0034: {using liquid heat storage material}
- F24D 3/08: in combination with systems for domestic hot-water supply
- F24D 19/1066: {for the combination of central heating and domestic hot water}
- F28D 20/0039: {with stratification of the heat storage material}
- F28D 20/0052: {using the ground body or aquifers as heat storage medium}
- F24D 2200/11: Geothermal energy
- F24D 2200/123: Compression type heat pumps
- F28D 2020/0069: {Distributing arrangements; Fluid deflecting means}
- Y02B 10/40: Geothermal heat-pumps
- Y02E 60/14: Thermal energy storage
- Y02P 80/15: On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F24D: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to a thermal energy storage system comprising an energy storage (2) having a vertical temperature gradient and an internal combined heating and cooling machine (15). The internal combined heating and cooling machine (15) is adapted for retrieving energy having a first temperature from the energy storage, while simultaneously returning heated energy having a second higher temperature and cooled energy having a third lower temperature. The invention also relates to a method for using the thermal energy storage system.

## Claims

### Claim 1

A thermal energy storage system comprising an energy storage (2) having a vertical temperature gradient and an internal combined heating and cooling machine (15),
said internal combined heating and cooling machine (15) being adapted for retrieving fluid having a first temperature from the energy storage, while simultaneously returning heated fluid having a second higher temperature and cooled fluid having a third lower temperature, wherein said internal combined heating and cooling machine (15) comprises at least two heat pumps, wherein each heat pump comprises at least two compressors, and wherein said internal combined heating and cooling machine (15) is adapted for alternating the connection between said at least two compressors between series connection and parallel connection.

### Claim 2 (depends on 1)

The thermal energy storage system according to claim 1, further comprising a pressurized electrical steam boiler arranged within said energy storage system such that surplus electricity in an electrical grid can be transformed into thermal energy as steam which can be directly injected into the thermal energy storage (2).

### Claim 3 (depends on 1)

The thermal energy storage system according to claim 1, further comprising at least one immersion heater arranged within said energy storage (2).

### Claim 4 (depends on 1)

The thermal energy storage system according to claim 1, further comprising at least one heat-absorbing system (3, 4).

### Claim 5 (depends on 1)

The thermal energy storage system according to claim 1, wherein at least one of said heat-absorbing system (3) is a low temperature system.

### Claim 6 (depends on 1)

The thermal energy storage system according to claim 1, wherein at least one of said heat-absorbing system (4) is a high temperature system.

### Claim 7 (depends on 1)

The thermal energy storage system according to claim 1, further comprising a heat-emitting system (7).

### Claim 8 (depends on 4)

The thermal energy storage system according to claim 4, wherein said heat-emitting system (7) comprises a combined heat and power plant.

### Claim 9 (depends on 4)

The thermal energy storage system according to claim 4, wherein said heat-emitting system (7) comprises an electrical hot water boiler and/or an electrical steam boiler.

### Claim 10 (depends on 1)

A method for using a thermal energy storage system according to claim 1, comprising the steps of:
retrieving fluid from a first level of temperature from the energy storage (2),
returning heated fluid having a second, higher temperature to a corresponding level of said energy storage (2) or to a heat-emitting system (7), and
returning cooled fluid having a third, lower temperature to a corresponding level of said energy storage (2) or to a heat-absorbing system (3, 4).