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1. WO2012049086 - SYSTÈME DE RÉCUPÉRATION DE CHALEUR

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

AMENDED CLAIMS

received by the International Bureau on 22 December 2011 (22.12.11)

1. A method for recovering of waste heat, comprising the steps of:

in a heat recovery cycle (54), heating a thermal storage medium from a low temperature storage to a heat recovery storage with waste heat from a continuous waste heat source to a heat recovery temperature (TR);

in a heat pump cycle (12), transferring heat from the thermal storage medium from the heat recovery storage at the heat recovery temperature (TR) via a working fluid to a thermal storage medium from the low temperature storage to the high temperature storage at a temperature (TH) above the heat recovery temperature (TR);

in a heat engine cycle (28), transferring heat from the thermal storage medium at the high temperature (TH) from the high temperature storage to the low temperature storage to a working fluid and generating mechanical energy by expanding the working fluid.

2. The method of claim 1 ,

wherein in the heat recovery cycle (28), a thermal storage medium at a low temperature (TL) is heated to the heat recovery temperature (TR).

3. The method of claim 1 or 2,

wherein in the heat pump cycle (12), the working fluid is heated by cooling the thermal storage medium of the heat recovery temperature (TR) to a low temperature (TL).

4. The method of one of the preceding claims,

wherein in the heat pump cycle (12), a stream of thermal storage medium with a first flowrate at a low temperature (TL) is heated by the working fluid to a first intermediate temperature (Tn),

wherein the stream with a first flowrate is mixed with a stream of thermal storage medium or is split into two flows to generate a stream of thermal storage medium of a second flowrate,

wherein the stream , of the second flowrate is heated by the working fluid to the high temperature (TH).

5. The method of claim 1,

wherein in the heat recovery cycle (54), a thermal storage medium at a low temperature (TL) is heated with waste heat, mixed with a thermal storage medium at a first intermediate temperature (Tn) and heated to the heat recovery temperature (TR), which is a second intermediate temperature (Tn).

6. The method of claim 5,

wherein i the heat pump cycle (12), the working fluid is heated by cooling a first stream of thermal storage medium at the second intermediate temperature (Tn) to the first intermediate temperature (Tn);

wherein in the heat pump cycle (12), a second stream of thermal storage medium at the second intermediate temperature (Ti2) is heated by the working fluid to the high temperature (TH).

7. The method of one of the preceding claims,

wherein in the heat engine cycle (28), the thermal storage medium of high temperature (TH) is cooled by the working fluid to a second intermediate temperature (TE) and mixed with a stream of thermal storage medium of the second intermediate temperature (¾) to generate a different flowrate;

wherein in the heat engine cycle (28), the thermal storage medium of the second intermediate temperature (Tn) is cooled to a first intermediate temperature (Tn) and split into two streams to generate a further different flowrate, wherein one of the streams is cooled by the working fluid to the low temperature (TL).

8. The method of one of the preceding claims,

wherein in the heat engine cycle (28) and/or the heat pump cycle (12), during heat transfer between the working fluid and the thermal storage medium, the working fluid is transcritical.

9. The method of one of the preceding claims,

wherein in the heat engine (28) cycle and/or the heat pump cycle (12), during heat transfer between the working fluid and the thermal storage medium, a flowrate of the thermal storage medium between a low and an intermediate temperature and a flowrate of the thermal storage medium between the intermediate and a high temperature are set, such that during heat transfer, the maximal temperature difference between the thermal storage medium and the working fluid is minimal.

10. The method of one of the preceding claims, further comprising the step of:

in an additional heat engine cycle (68), transferring heat from the thermal storage medium with the heat recovery temperature (TR) to a compressed working fluid and generating mechanical energy by expanding the working fluid.

1 1. The method of one of the preceding claims,

wherein the working fluid comprises carbon dioxide.

12. A waste heat recovery system (40, 140), comprising:

a thermal storage circuit (22) with a low temperature storage (24), a heat recovery , storage (46, 146) and a high temperature storage (26);

a heat exchanger (48, 148) for heating a thermal storage medium flowing from the low temperature storage (24) to the heat recovery storage (46, 146) with waste heat;

a heat pump cycle (12) containing a working fluid and comprising an expander (14) for expanding the working fluid and a compressor (18) for compressing the working fluid, a heat engine cycle (28) containing a working fluid and comprising a pump (30) for compressing the working fluid and a turbine (32) for expanding the working fluid;

wherein the heat pump cycle (12) comprises a first heat exchanger (16) for heating the expanded working fluid by cooling thermal storage medium from the heat recovery storage '(46, 146);

wherein the heat pump cycle (12) comprises a second heat exchanger (20) for heating thermal storage medium flowing from the low temperature storage (24) to the high temperature storage (26) by cooling the compressed working fluid;

wherein the heat engine cycle (28) comprises a second heat exchanger (20) for heating the compressed working fluid by cooling thermal storage medium flowing from the high temperature storage (26) to the low temperature storage (24).

13. The system (40, 140) of claim 12,

wherein the second heat exchanger (20) for cooling or heating the compressed working fluid comprises an internal stream splitter for generating different flowrates in the second heat exchanger (20) during heat transfer, wherein the stream splitter mixes a stream . of thermal storage medium in the second heat exchanger (20) with thermal storage medium from an intermediate temperature storage (42, 44, 146) or splits the stream in the second heat exchanger (20) into a stream to be further cooled or heated and a stream to the intermediate temperature storage (42, 44, 146).

14. The system (40) of claim 12 or 13,

wherein in the heat pump cycle (12) thermal storage medium from the heat recovery storage (46) is cooled to the low temperature (TL) and flows to the low temperature storage (24) ;

wherein in the heat pump cycle (12) thermal storage medium from the low temperature storage (24) flows through the (second) heat exchanger (20) and is heated to the high temperature (TH).

15. The system (140) of claim 12 or 13,

wherein the thermal storage circuit comprises a first intermediate temperature storage (42) and the heat recovery storage (146) is a second intermediate temperature storage;

wherein, in the heat recovery cycle (54), thermal storage medium from the low temperature storage (24) and the first intermediate temperature storage (42) is mixed while being heated to the 'Second intermediate temperature (¾) and flows to the second intermediate temperature storage (146);

wherein, in the heat pump cycle (12), thermal storage medium from the second intermediate temperature storage (146) is cooled in the (first) heat exchanger (16) to the first intermediate temperature (Tn) and flows to the first intermediate temperature storage (42);

wherein, in the heat pump cycle (12), thermal storage medium from the second intermediate temperature storage (146) is heated by the compressed working fluid to the high temperature (TH) anad flows to the high temperature storage (26).