CRYOGENIC TANK DEVICE WITH HEAT EXCHANGER

Abstract

A cryogenic tank apparatus includes an inner container for holding a cryogenic medium, an outer housing surrounding the inner container, an insulation space disposed between the inner container and the outer housing, and at least one heat exchanger. The at least one heat exchanger includes at least one cold flow line through which flows the cryogenic medium held in the inner container, and at least one hot flow line in thermal contact with the at least one cold flow line and through which flows a temperature control medium in such a manner that a transfer of heat takes place between the temperature control medium and the cryogenic medium. The at least one cold flow line is arranged on an inner side of the outer housing and the at least one hot flow line is arranged on an outer side of the outer housing so that a portion of the outer housing acts as a heat transfer surface of the heat exchanger.

Claims

1. A cryogenic tank apparatus, comprising: an inner container for holding a cryogenic medium; an outer housing surrounding the inner container; an insulation space disposed between the inner container and the outer housing; and at least one heat exchanger including: at least one cold flow line through which flows the cryogenic medium held in the inner container, and at least one hot flow line in thermal contact with the at least one cold flow line and through which flows a temperature control medium in such a manner that a transfer of heat takes place between the temperature control medium and the cryogenic medium, wherein the at least one cold flow line is arranged on an inner side of the outer housing and the at least one hot flow line is arranged on an outer side of the outer housing so that a portion of the outer housing acts as a heat transfer surface of the at least one heat exchanger.

2. The cryogenic tank apparatus of claim 1, wherein the outer housing forms at least one sector in a peripheral direction of the at least one cold flow line.

3. The cryogenic tank apparatus of claim 2, wherein the outer housing forms at least one sector in a peripheral direction of the at least hot cold flow line.

4. The cryogenic tank apparatus of claim 1, wherein the at least one cold flow line is formed at least in part by the outer housing and by a housing which partially surrounds the outer housing.

5. The cryogenic tank apparatus of claim 1, wherein the at least one hot flow line is formed at least in part by the outer housing and by a housing which partially surrounds the outer housing.

6. The cryogenic tank apparatus of claim 1, further comprising a plurality of fins arranged on an inner side of the outer housing in a region that serves as the heat transfer surface of the at least one heat exchanger.

7. The cryogenic tank apparatus of claim 1, further comprising a plurality of fins arranged on an outer side of the outer housing in a region that serves as the heat transfer surface of the at least one heat exchanger.

8. The cryogenic tank apparatus of claim 1, wherein the at least one cold flow line and the at least hot cold flow line extend in a longitudinal direction of the outer housing.

9. The cryogenic tank apparatus of claim 1, wherein the at least one cold flow line and the at least hot cold flow line extend along a periphery of the outer housing.

10. The cryogenic tank apparatus of claim 1, wherein the at least one cold flow line and the at least hot cold flow line are formed on an end face of the outer housing.

11. The cryogenic tank apparatus of claim 1, wherein the at least hot flow line comprises a plurality of channels extending in parallel and/or in series.

12. The cryogenic tank apparatus of claim 1, wherein the at least cold flow line comprises a plurality of channels extending in parallel.

13. The cryogenic tank apparatus of claim 1, wherein the at least hot flow line comprises a plurality of channels extending in series.

14. The cryogenic tank apparatus of claim 1, wherein the at least cold flow line comprises a plurality of channels extending in series.

15. The cryogenic tank apparatus of claim 1, wherein the at least hot cold flow line and the at least one cold flow line are configured for co-current or counter-current operation.

16. The cryogenic tank apparatus of claim 1, wherein the at least hot cold flow line, at least in a portion thereof, has a width that is greater wider than a width of the at least one cold flow line in an opposite portion thereof.

17. The cryogenic tank apparatus of claim 1, further comprising a thermal insulation arranged on a side of the at least hot cold flow line that is remote from the outer housing.

18. The cryogenic tank apparatus of claim 1, further comprising a second heat exchanger arranged in series with the heat exchanger for transferring heat to the cryogenic medium.

19. The cryogenic tank apparatus of claim 18, further comprising a second heat exchanger arranged in parallel with the heat exchanger for transferring heat to the cryogenic medium.

20. A cryogenic tank apparatus, comprising: an inner container for holding a cryogenic medium; an outer housing surrounding the inner container; an insulation space disposed between the inner container and the outer housing; and at least one heat exchanger including: at least one cold flow line through which flows the cryogenic medium held in the inner container, and at least one hot flow line through which flows a temperature control medium, the at least one hot flow line being arranged adjacent to the at least one cold flow line along a heat transfer surface in such a manner that a transfer of heat takes place between the temperature control medium and the cryogenic medium via the heat transfer surface, wherein the at least one cold flow line is arranged on an inner side of the outer housing and the at least one hot flow line is arranged on an outer side of the outer housing so that a portion of the outer housing acts as a heat transfer surface of the heat exchanger.

Description

DRAWINGS

[0027] One or more embodiments will be illustrated by way of example in the drawings and explained in the description hereinbelow.

[0028] FIG. 1 illustrates a schematic representation of a cryogenic tank apparatus, in accordance with a first embodiment.

[0029] FIGS. 2A to 2D respectively illustrate a schematic representation of the cryogenic tank apparatus of FIG. 1, including a side view (FIG. 2A), a detail thereof (FIG. 2B), a top view on an outer side of the outer housing (FIG. 2C), and a top view on an inner side of the outer housing (FIG. 2D).

[0030] FIGS. 3A to 3C respectively illustrate a schematic representation of a cryogenic tank apparatus in accordance with a second embodiment, including a side view (FIG. 3A), an end face (FIG. 3B), and a detail thereof (FIG. 3C).

[0031] FIGS. 4A to 4D respectively illustrate a schematic representation of a cryogenic tank apparatus in accordance with a third embodiment, including a side view (FIG. 4A), a detail thereof (FIG. 4B), from an end face on an outer side of the outer housing (FIG. 4C), and from an end face on an inner side of the outer housing (FIG. 4D).

DESCRIPTION

[0032] FIG. 1 illustrates a cryogenic tank apparatus in accordance with a first embodiment. The cryogenic tank apparatus comprises an inner container 1 for holding a cryogenic medium such as hydrogen, and an outer housing 2 surrounding the inner container 1. An insulation space 3, in particular, a vacuum space, is disposed between the inner container 1 and the outer housing 2.

[0033] The cryogenic tank apparatus further comprises at least one heat exchanger 4 that itself comprises at least one cold flow line 5 through which flows the cryogenic medium that is held in the inner container 1, and at least hot cold flow line 6 through which flows a temperature control medium. The at least hot cold flow line 6 is heated by heat from a heat source 9, for example, in the form of waste heat of another component. Circulation of the temperature control medium through the at least hot cold flow line 6 can be maintained by a heat transfer pump 10.

[0034] The cryogenic medium for the at least one cold flow line 5 is extracted from the inner container 1, for example, in gas form via a gas extraction valve 11 and/or in liquid form via a liquid extraction valve 12. Downstream of the heat exchanger 4, the cryogenic medium can flow via a hydrogen extraction valve 13 to a consumer, for example, a fuel cell.

[0035] The at least one cold flow line 5 and the at least hot cold flow line 6 of the heat exchanger 4 are in contact with one another and/or are arranged adjacent to one another along a heat transfer surface in such a manner that a transfer of heat takes place between the temperature control medium in the at least hot cold flow line 6 and the cryogenic medium in the at least one cold flow line 5 via the heat transfer surface. The at least one cold flow line 5 is arranged on the inner side of the outer housing 2 and the at least hot cold flow line 6 is arranged on the outer side of the outer housing 2, so that the corresponding regions of the outer housing 2 itself act as the heat transfer surface of the heat exchanger 4.

[0036] The heat exchanger 4, or the at least one cold flow line 5 and the at least hot cold flow line 6, can be arranged at different positions on the outer housing 2. For example, FIGS. 1 and 2A to 2D illustrate an embodiment of a cryogenic tank apparatus in which the at least one cold flow line 5 and the at least hot cold flow line 6 extend in a longitudinal direction of the cylindrical outer housing 2. The heat exchanger 4, or the at least one cold flow line 5 and the at least hot cold flow line 6, here extend in a U-shape along the longitudinal axis of the cylindrical outer housing 2.

[0037] FIGS. 3A to 3C illustrate an embodiment of a cryogenic tank apparatus in which the heat exchanger 4, or the at least one cold flow line 5 and the at least hot cold flow line 6, extend along the periphery of the cylindrical outer housing 2.

[0038] FIGS. 4A to 4D illustrate another embodiment of a cryogenic tank apparatus in which the heat exchanger 4, or the at least one cold flow line 5 and the at least hot cold flow line 6, are formed on an end face of the outer housing 2, namely in the form of a circle or, more precisely, of a circular segment which approximately forms a circle.

[0039] As illustrated in the detail view of FIG. 2B, an inlet 14 to the at least one cold flow line 5 is formed in the insulation space 3 and an inlet 15 to the at least hot cold flow line 6 is formed outside the outer housing 2.

[0040] FIG. 2C illustrates the cryogenic tank apparatus from above on the outer side of the outer housing, while FIG. 2D illustrates a top view on the inner side of the outer housing. The at least one cold flow line 5 and the at least hot cold flow line 6 are in each case arranged opposite one another along their run on the outer housing 2.

[0041] FIGS. 3A to 3C illustrate, via arrows, the inflows and outflows of the at least one cold flow line 5 and the at least hot cold flow line 6 in the illustrated embodiment.

[0042] The detail view of FIG. 4B illustrates a heat exchanger 4 in lateral section. The outer housing 2 forms a sector in the peripheral direction of the at least one cold flow line 5 and of the at least hot cold flow line 6. The at least one cold flow line 5 and the at least hot cold flow line 6 are formed at least in part by the outer housing 2 and by a housing 7 which surrounds the outer housing in some regions. In a region in which the outer housing 2 acts as the heat exchange surface of the heat exchanger 4, the outer housing has fins 8 on its inner side and on its outer side. The at least hot cold flow line 6 and the at least one cold flow line 5 comprise a plurality of channels which extend in parallel, and which are separated by fins 8.

[0043] The at least hot cold flow line 6, at least in the portion illustrated in FIG. 4B, is wider than the opposite at least one cold flow line 5 in the same portion.

[0044] A thermal insulation can additionally be fitted on the side of the at least hot cold flow line 6 that is remote from the outer housing 2, which thermal insulation can comprise, for example, a further housing surrounding the at least hot cold flow line 6.

[0045] In accordance with one or more embodiments, a portion of the vacuum shell, i.e., the outer housing 2 a cryogenic tank, is used as a heat transfer surface between the cryogenic fluid and the heat transfer medium. In that way, the heat exchanger is integrated in the outer housing 2.

[0046] In order to increase the amount of heat that is transferred, the surface of the outer housing 2 that is used for the heat transfer can be provided (on both sides or only on the heat transfer medium side) with fins 8, and a corresponding enclosure can be installed thereover. The heat exchanger can be integrated into the outer housing 2 axially on the casing (FIGS. 2A to 2D), in the peripheral direction (FIGS. 3A to 3C) or at the end face (FIGS. 4A to 4D). The heat exchanger can be operated by the co-current or counter-current principle. A wider form of the heat transfer medium side prevents the formation of cold spots on the outer side of the vacuum shell, in order to avoid injury risks and ice formation or even oxygen condensation. An additional thermal insulation of the at least hot cold flow line 6, in particular of the EGW side, where EGW stands for an ethylene glycol-water mixture as a possible temperature control medium, reduces heat losses to the environment.

[0047] The terms coupled, attached, or connected may be used herein to refer to any type of relationship, direct or indirect, between the components in question, and may apply to electrical, mechanical, fluid, thermal, optical, electromagnetic, electromechanical, or other connections. In addition, the terms first, second, etc. are used herein only to facilitate discussion, and carry no particular temporal or chronological significance unless otherwise indicated.

[0048] Those skilled in the art will appreciate from the foregoing description that the broad techniques of the embodiments can be implemented in a variety of forms. Therefore, while the embodiments have been described in connection with particular examples thereof, the true scope of the embodiments should not be so limited since other modifications will become apparent to the skilled practitioner upon a study of the drawings, specification, and following claims.

LIST OF REFERENCE SYMBOLS

[0049] 1 inner container [0050] 2 outer housing [0051] 3 insulation space [0052] 4 heat exchanger [0053] 5 at least one cold flow line [0054] 6 at least hot cold flow line [0055] 7 housing [0056] 8 fins [0057] 9 heat source [0058] 10 heat transfer pump [0059] 11 gas extraction valve [0060] 12 liquid extraction valve [0061] 13 hydrogen extraction valve [0062] 14 inlet to cold flow line [0063] 15 inlet to hot flow line