WO2021094867A1 - Device and method for thermally compressing a medium - Google Patents

Device and method for thermally compressing a medium Download PDF

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Publication number
WO2021094867A1
WO2021094867A1 PCT/IB2020/060281 IB2020060281W WO2021094867A1 WO 2021094867 A1 WO2021094867 A1 WO 2021094867A1 IB 2020060281 W IB2020060281 W IB 2020060281W WO 2021094867 A1 WO2021094867 A1 WO 2021094867A1
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WO
WIPO (PCT)
Prior art keywords
space
medium
vessels
impeller
vessel
Prior art date
Application number
PCT/IB2020/060281
Other languages
French (fr)
Inventor
Jan Lietaer
Original Assignee
Studieburo B
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from BE20205188A external-priority patent/BE1027752B1/en
Application filed by Studieburo B filed Critical Studieburo B
Publication of WO2021094867A1 publication Critical patent/WO2021094867A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B31/00—Free-piston pumps specially adapted for elastic fluids; Systems incorporating such pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2280/00—Output delivery
    • F02G2280/50—Compressors or pumps

Definitions

  • the present invention relates to a device for thermally compressing a medium, comprising:
  • an impeller which is arranged in the housing for delimiting in the housing: o a first space; o a second space; wherein this impeller is displaceable in the housing between a first position in which the first space is at its smallest and the second space is at its largest, and a second position in which the first space is at its largest and the second space is at its smallest;
  • Such devices are for example described and illustrated in US 3,413,815 A, US 2,157,229 A, WO 2014/023586 Al, WO 2014/202885 Al, WO 2017/068066 A1 and WO 2018/193188 Al.
  • Such a device comprises heating means which are thermally coupled to the second space for heating medium in this second space. Furthermore, this device comprises cooling means which are thermally coupled to the first space for cooling medium in this first space.
  • the first space and the second space of the device are coupled to each other by means of a regenerator, so that the pressure in both spaces is identical.
  • the inlet and the outlet are provided with non-return valves.
  • Fig. 2 The operational principle of such a device is diagrammatically illustrated in Fig. 2 and the compression cycle is illustrated in Fig. 1.
  • the impeller moves up and down and in the process displaces medium from the second space to the first space and vice versa from the first space to the second space, respectively.
  • the medium in the second space is heated up by heating means.
  • the medium moves through the regenerator from the second space to the first space and expands isochorically (from Ai to Bi). Heat from the medium is stored in the regenerator. The pressure in both spaces drops until the inlet pressure is reached.
  • the non-return valve in the inlet opens and medium is isobarically sucked into the first space via this inlet (from Bi to Ci). Thereafter, this non-return valve closes.
  • the medium in the first space is cooled down by the cooling means.
  • Medium now moves from the first space to the second space and is isochorically compressed in the first space (from Ci to Di). Some of the heat of the medium which was stored in the regenerator is recovered. During this process, the pressure in the first space increases until the outlet pressure is reached.
  • the non-return valve in the outlet opens and medium exits the first space at high pressure (from Di to Ai).
  • a device for thermally compressing a medium comprising:
  • an impeller which is arranged in the housing for delimiting in the housing: o a first space; o a second space; wherein this impeller is displaceable in the housing between a first position in which the first space is at its smallest and the second space is at its largest, and a second position in which the first space is at its largest and the second space is at its smallest; an inlet for letting the medium to be compressed into the first space; an outlet for letting the compressed medium out of the first space; cooling means which are thermally coupled or couplable to the first space; heating means which are thermally coupled or couplable to the second space; and a first regenerator by means of which the first space and the second space are coupled or couplable to each other in order to drive the displacement movement of the impeller, and several vessels, wherein these vessels are each filled with a pressurized medium, wherein this pressure for each of the vessels deviates in a stepped manner and wherein each of these vessels is alternately couplable to a said space in order to displace medium in
  • the pressure before and after displacement changes to a lesser degree in these vessels.
  • This pressure is also self-correcting in each vessel. If, at the start, this pressure deviates from the optimum pressure in this vessel, more or less medium will be displaced until the optimum pressure is finally reached in each vessel.
  • the device is able to operate at a lower temperature while achieving a similar or even higher COP than a similar device according to the prior art.
  • the temperature of the medium which passes into the first regenerator is more constant for such a device with such vessels. This applies both to the flow of medium from the second space to the first space and to the flow of medium from the first space to the second space.
  • the vessels are alternately couplable to the second space in order to couple these vessels to a said space, this in order to displace medium in the second space from the second space to the vessels in a stepped manner when the impeller is in its first position and to displace medium in the vessels from the vessels to the second space in a stepped manner when moving the impeller from its second position to its first position.
  • Such an embodiment of a device according to the present invention preferably comprises a controllable valve for mutually coupling the first space and the second space by means of this first regenerator.
  • this regenerator can easily then be closed off by means of this valve, so that no medium can flow between the first space and the second space.
  • this valve can then be opened in order to mutually couple the first space and the second space by means of this first regenerator.
  • the heating means may comprise a heating element for each vessel which is thermally coupled or couplable to that vessel. By coupling the second space, the associated heating elements of the heating means are coupled to the second space.
  • a device according to the invention wherein the vessels are couplable to the second space furthermore preferably comprises a valve for each vessel in order to couple this vessel to the second space.
  • such a device then comprises a second regenerator for each vessel which is coupled or couplable to the second space and by means of which the respective valve of that vessel is coupled, for alternately coupling the vessels to the second space.
  • a second regenerator for each vessel which is coupled or couplable to the second space and by means of which the respective valve of that vessel is coupled, for alternately coupling the vessels to the second space.
  • the heating means may comprise a heating element for each vessel for heating the respective second regenerator.
  • the vessels are not alternately couplable to the second space, but are alternately couplable to the first space in order to displace medium in the second space in a stepped manner, via the regenerator and the first space, from the second space to the vessels when the impeller is in its first position and to displace medium in the vessels from the vessels to the first space in a stepped manner when the impeller is in its second position, so that this medium may be passed to the second space via the regenerator when moving the impeller from its second position to its first position.
  • the temperature of the medium which enters the regenerator is less constant, because the change in pressure in the spaces is much greater. This change in pressure causes a varying temperature of medium which is sucked in. Therefore, the efficiency of the regenerator is lower.
  • the mass which passes through the first regenerator is as great as the sum of the masses of the first generator and the second regenerators in an abovementioned embodiment which is provided with said second regenerators.
  • Such an alternative device according to the invention furthermore preferably comprises a valve for each vessel to couple this vessel to the first space.
  • Said heating means of a device according to the present invention may comprise, for example, a gas burner.
  • these heating means comprise an electric heating element.
  • the housing and the impeller form a first compressor
  • the device comprises a second, similar compressor
  • the heating elements of the first compressor comprise a burner which is thermally coupled to the second space of the first compressor and which comprises a waste gas outlet for discharging waste gases of this burner, wherein this waste gas outlet is coupled to the second compressor as a heating means.
  • This second compressor may be connected in series or in parallel with the first compressor.
  • the device instead of using the first regenerator to cause the displacement movement of the impeller, it is in addition possible to provide the device with, for example, a motor to displace this impeller via a drive shaft.
  • This motor may be used, for example, to start up the operation of the device, after which the latter may continue automatically.
  • the device may be provided with a generator which is drivable by means of the displacement movement of the impeller via a drive shaft, so that the device can operate according to the principle of a Stirling engine.
  • the object of the present invention is furthermore also achieved by providing a heat pump which comprises an above-described device according to the present invention.
  • the object of the present invention is also achieved by providing a method for thermally compressing a medium in a device for thermally compressing a medium, comprising:
  • an impeller which is arranged in the housing for delimiting in the housing: o a first space; o a second space; wherein this impeller is displaceable in the housing between a first position in which the first space is at its smallest and the second space is at its largest, and a second position in which the first space is at its largest and the second space is at its smallest;
  • this method comprises the following steps:
  • step a heating medium in the second space by means of the heating means to displace the impeller from the first position to the second position, wherein medium to be compressed is let in into the first space via the inlet;
  • step b cooling down medium in the first space by means of the cooling means to displace the impeller from the second position to the first position, wherein the compressed medium is let out of the first space via the outlet.
  • vessels when the impeller is in the first position, prior to step a, in a step c, vessels, each filled with pressurized medium, wherein this pressure is lower for each of the vessels than the pressure of medium in the second space, and wherein this pressure deviates for each of the vessels, are alternately coupled to a said space in a stepped manner, starting with the vessel containing the medium under the highest pressure and ending with the vessel containing the medium under the lowest pressure, in order to displace medium in the second space from the second space to the vessels in a stepped manner (optionally via the first space and the regenerator); and
  • each of these vessels is alternately coupled to a said space in a stepped manner, starting with the vessel containing the medium under the lowest pressure and ending with the vessel containing the medium under the highest pressure, in order to displace medium in the vessels from the vessels to the second space in a stepped manner (optionally via the first space and the regenerator).
  • FIG. 1 shows the compression cycle of a device according to the prior art
  • FIG. 2 diagrammatically shows the operational principle of a device according to the prior art in various steps
  • FIG. 3 diagrammatically shows a first embodiment of a device for thermally compressing a medium according to the invention, with the impeller in its first position;
  • FIG. 4 diagrammatically shows the device from Fig. 3, with the impeller in its second position;
  • Figs. 5 to 10 diagrammatically show the various steps for displacing medium in the second space of the device from Fig. 3 to the five vessels of this device;
  • FIG. 11 shows the compression cycle of the device from Fig. 3;
  • - Figs. 12 to 17 diagrammatically show the operational principle of the device from Fig. 3 in various steps;
  • - Fig. 18 diagrammatically shows a second embodiment of a device for thermally compressing a medium according to the invention, with the impeller in its first position.
  • the illustrated devices (1) are devices (1) for thermally compressing supercritical CO2. Similar devices (1) may also be provided for thermally compressing other media, such as for example gases for diving cylinders, etc.
  • the illustrated devices (1) comprise a housing (2) and an impeller (3) which is arranged in the housing (2) for delimiting a first space (4) and a second space (5) in the housing (2).
  • the impeller (3) is displaceable in the housing (2) between a first position in which the first space (4) is at its smallest and the second space (5) is at its largest (as illustrated in Fig. 3) and a second position in which the first space (4) is at its largest and the second space (5) is at its smallest (as illustrated in Figs. 4 and 18).
  • the impeller (3) is connected to a plunger (drive shaft) (29) which extends through the housing (2) and is couplable to a motor for initiating the displacement movement of the impeller (3).
  • This motor may optionally also be configured as a generator.
  • the first space (4) is arranged at the bottom of the housing (2) and the second space (5) is arranged at the top of the housing.
  • a reverse arrangement is also possible, analogously to US 2,157,229 A.
  • the impeller (3) is upwardly and downwardly displaceable, but another displacement movement is also possible, such as for example a displacement movement analogously to US 3,413,815 A.
  • Heating means are thermally coupled to the second space (5) for heating medium in this second space (5).
  • Cooling means are thermally coupled to the first space (4) for cooling down medium in this first space (4).
  • These heating means and cooling means are not illustrated, but may, for example, be configured in a way similar to that in the prior art.
  • the first space (4) and the second space (5) of the device (1) are coupled to each other by means of a first regenerator (15), so that the pressure in both spaces (4, 5) is equal.
  • An inlet (6) into the first space (4) is provided with a non-return valve (20) for letting medium to be compressed into the first space (4).
  • An outlet (7) out of the first space (4) is also provided with a non-return valve (21) in order to let compressed medium out of the first space (5).
  • this device (1) also comprises several vessels (8, 9, 10, 11, 12). These vessels (8, 9, 10, 11, 12) are each filled with pressurized supercritical CO2, wherein this pressure differs for each of the vessels (8, 9, 10, 11, 12) in a stepped manner, as is evident in Figs. 5 to 10.
  • each of these vessels (8, 9, 10, 11, 12) is connected to the second space (5) by means of lines (27).
  • these vessels (8, 9, 10, 11, 12) are connected to the first space (4).
  • a valve (22, 23, 24, 25, 26) is arranged in these lines (27) for each vessel (8, 9, 10, 11, 12), so that the vessels (8, 9, 10, 11, 12) are alternately couplable to the second space (5) in the first illustrated embodiment and to the first space (4) in the second illustrated embodiment.
  • a second regenerator (17) may be arranged for each vessel (8, 9, 10, 11, 12), as is illustrated in the first embodiment, so that it is possible to limit the temperature of medium which flows through the valves (22, 23, 24, 25, 26).
  • the illustrated devices (1) comprise five vessels (8, 9, 10, 11, 12). In alternative devices (1), it is also possible to provide more or fewer vessels (8, 9, 10, 11, 12).
  • a controllable valve (16) is furthermore provided in the regenerator (15), by means of which it is possible to open and close the coupling between the first space (4) and the second space (5).
  • the impeller (3) may also be driven by a motor so that it may be moved without medium having to be displaced via the regenerator (15).
  • the second space (5) in the first illustrated embodiment is first alternately coupled to the vessels (8, 9, 10, 11, 12) (from A to B in Fig. 11) (Figs. 5 to 10; Figs.
  • the CO2 in the second space (5) is heated up by the heating means, moves through the regenerator (15) from the second space (5) to the first space (4) and expands isochorically.
  • the impeller (3) moves upwards (Figs. 14-15). Heat from the CO2 is stored in the regenerator (15).
  • the pressure in the first space (4) decreases until the inlet pressure is reached.
  • the non-return valve (20) in the inlet (6) opens and medium is isobarically sucked into the first space (4) via this inlet (6) (from C to D in Fig. 11) (Figs. 14-15). Then, this non-return valve (20) closes.
  • the valve (16) in the regenerator (15) is closed.
  • the second space (5) is alternately coupled to the vessels (8, 9, 10, 11, 12) (from D to E in Fig. 11) (Figs. 10 to 5; Figs. 15-16) by alternately opening and closing the respective valves (22, 23, 24, 25, 26), starting with the vessel (12) containing CO2 under the lowest pressure (Figs. 10-9) and ending with the vessel (8) under the highest pressure (Figs. 6-5).
  • the pressure in these vessels (8, 9, 10, 11, 12) decreases to the pressure in the second space (5), while the pressure in the second space (5) increases in a stepped manner.
  • the impeller (3) moves downwards.
  • the valve (16) in the regenerator (15) is opened.
  • the medium in the first space (4) is cooled by means of the cooling means (14) and through expansion. Medium is displaced from the first space (4) to the second space (5) and is isochorically compressed in the first space (4) (from E to F in Fig. 11) (Figs. 16-17). Some of the heat of the medium which was stored in the regenerator (15) is recovered. In this case, the pressure in the first space (4) increases until the outlet pressure is reached.
  • the non-return valve (21) in the outlet (7) opens and medium leaves the first space (4) at high pressure (from F to A in Fig. 11) (Figs. 17-12).
  • valve (16) in the regenerator (15) is closed again and the cycle can repeat.
  • the first space (4) is first alternately coupled to the vessels (8, 9, 10, 11, 12) by alternately opening and closing the respective valves (22, 23, 24, 25, 26), starting with the vessel (8) containing CO2 under the highest pressure and ending with the vessel (12) under the lowest pressure.
  • the CO2 from the second space (5) flows to the vessels (8, 9, 10, 11, 12) via the regenerator (15) and the first space (4).
  • the pressure in these vessels (8, 9, 10, 11, 12) increases to the pressure in the second space (5), while the pressure in the second space (5) decreases in a stepped manner.
  • the CO2 expands isentropically.
  • the CO2 in the second space (5) is heated up by the heating means, moves through the regenerator (15) from the second space (5) to the first space (4) and expands isochorically.
  • the impeller (3) moves upwards. Heat from the CO2 is stored in the regenerator (15).
  • the pressure in the first space (4) decreases until the inlet pressure is reached.
  • the non-return valve (20) in the inlet (6) opens and medium is isobarically sucked into the first space (4) via this inlet (6). Then, this non-return valve (20) closes.
  • the first space (4) is then alternately coupled to the vessels (8, 9, 10, 11, 12), starting with the vessel (12) containing CO2 under the lowest pressure and ending with the vessel (8) under the highest pressure.
  • the pressure in these vessels (8, 9, 10, 11, 12) decreases to the pressure in the second space (5), while the pressure in the second space (5) increases in a stepped manner.
  • the impeller (3) moves downwards.
  • the medium in the first space (4) is cooled by means of the cooling means (14) and through expansion. Medium is displaced from the first space (4) to the second space (5) and is isochorically compressed in the first space (4). Some of the heat of the medium which was stored in the regenerator (15) is recovered. In this case, the pressure in the first space (4) increases until the outlet pressure is reached.
  • the non-return valve (21) in the outlet (7) opens and medium leaves the first space (4) at high pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present invention relates to a device (1) for thermally compressing a medium, comprising: - a housing (2); - an impeller (3) for delimiting in the housing (2): o a first space (4) which is coolable by means of cooling means; o a second space (5) which is heatable by means of heating means; - an inlet (6) into and an outlet (7) out of the first space (4); - a regenerator (15) by means of which the spaces (4, 5) are coupled to each other; - several vessels (8, 9, 10, 11, 12), each filled with a medium under a different pressure and alternately couplable to one of the spaces (4, 5) to displace medium in this space (4, 5) to the vessels (8, 9, 10, 11, 12) in a stepped manner and to displace medium in the vessels (8, 9, 10, 11, 12) to this space (4, 5) in a stepped manner. In addition, the present invention relates to a method for thermally compressing a medium in such a device (1).

Description

DEVICE AND METHOD FOR THERMALLY COMPRESSING A MEDIUM
The present invention relates to a device for thermally compressing a medium, comprising:
- a housing;
- an impeller which is arranged in the housing for delimiting in the housing: o a first space; o a second space; wherein this impeller is displaceable in the housing between a first position in which the first space is at its smallest and the second space is at its largest, and a second position in which the first space is at its largest and the second space is at its smallest;
- an inlet for letting the medium to be compressed into the first space;
- an outlet for letting the compressed medium out of the first space;
- cooling means which are thermally coupled or couplable to the first space;
- heating means which are thermally coupled or couplable to the second space; and
- a first regenerator by means of which the first space and the second space are coupled or couplable to each other in order to drive the displacement movement of the impeller.
Such devices are for example described and illustrated in US 3,413,815 A, US 2,157,229 A, WO 2014/023586 Al, WO 2014/202885 Al, WO 2017/068066 A1 and WO 2018/193188 Al.
Such a device comprises heating means which are thermally coupled to the second space for heating medium in this second space. Furthermore, this device comprises cooling means which are thermally coupled to the first space for cooling medium in this first space. In this case, the first space and the second space of the device are coupled to each other by means of a regenerator, so that the pressure in both spaces is identical. The inlet and the outlet are provided with non-return valves.
The operational principle of such a device is diagrammatically illustrated in Fig. 2 and the compression cycle is illustrated in Fig. 1. The impeller moves up and down and in the process displaces medium from the second space to the first space and vice versa from the first space to the second space, respectively.
When the impeller is in its first position, the medium in the second space is heated up by heating means. The medium moves through the regenerator from the second space to the first space and expands isochorically (from Ai to Bi). Heat from the medium is stored in the regenerator. The pressure in both spaces drops until the inlet pressure is reached.
When the inlet pressure has been reached, the non-return valve in the inlet opens and medium is isobarically sucked into the first space via this inlet (from Bi to Ci). Thereafter, this non-return valve closes.
The medium in the first space is cooled down by the cooling means. Medium now moves from the first space to the second space and is isochorically compressed in the first space (from Ci to Di). Some of the heat of the medium which was stored in the regenerator is recovered. During this process, the pressure in the first space increases until the outlet pressure is reached.
When the outlet pressure has been reached, the non-return valve in the outlet opens and medium exits the first space at high pressure (from Di to Ai).
In practice, the coefficient of performance (COP) of a such a device is considerably lower than the COP which is theoretically achievable. The reason for this is that there are limitations to the heat which is storable in the regenerator and is recoverable.
It is the object of the present invention to increase the COP of such a device.
This object is achieved by providing a device for thermally compressing a medium, comprising:
- a housing;
- an impeller which is arranged in the housing for delimiting in the housing: o a first space; o a second space; wherein this impeller is displaceable in the housing between a first position in which the first space is at its smallest and the second space is at its largest, and a second position in which the first space is at its largest and the second space is at its smallest; an inlet for letting the medium to be compressed into the first space; an outlet for letting the compressed medium out of the first space; cooling means which are thermally coupled or couplable to the first space; heating means which are thermally coupled or couplable to the second space; and a first regenerator by means of which the first space and the second space are coupled or couplable to each other in order to drive the displacement movement of the impeller, and several vessels, wherein these vessels are each filled with a pressurized medium, wherein this pressure for each of the vessels deviates in a stepped manner and wherein each of these vessels is alternately couplable to a said space in order to displace medium in the second space from the second space to the vessels in a stepped manner when the impeller is in its first position and to displace medium in the vessels in a stepped manner from the vessels to the second space when the impeller is in its second position.
By means of these vessels, some of the medium is displaced to these vessels before the expansion of the medium and is injected again just before the compression of the medium. In this way, the COP of the device is increased significantly. Transferring this mass also reduces the effective pressure increase by the regenerator during compression.
Using several such vessels, it is possible to transfer a greater mass than is possible by using a single vessel. The energy content is transferred in an efficient manner.
The more vessels are involved, the smaller the pressure difference in a tank is during displacement. The larger the vessels, the smaller the pressure difference there is in a tank during displacement. However, there is a limit with respect to the size of the vessels and the number of vessels regarding efficiency.
In case several vessels are used, the pressure before and after displacement changes to a lesser degree in these vessels. This pressure is also self-correcting in each vessel. If, at the start, this pressure deviates from the optimum pressure in this vessel, more or less medium will be displaced until the optimum pressure is finally reached in each vessel. By means of said vessels, the device is able to operate at a lower temperature while achieving a similar or even higher COP than a similar device according to the prior art.
In contrast to the prior art, only a relatively small part of the medium will flow through the regenerator, so that the efficiency of the regenerator has a smaller degree of influence on the efficiency of the entire device. If the efficiency of the regenerator remains the same, the COP of such a device may be increased significantly by transferring medium between the second space and the vessels.
The temperature of the medium which passes into the first regenerator is more constant for such a device with such vessels. This applies both to the flow of medium from the second space to the first space and to the flow of medium from the first space to the second space.
In a first preferred embodiment of a device according to the present invention, the vessels are alternately couplable to the second space in order to couple these vessels to a said space, this in order to displace medium in the second space from the second space to the vessels in a stepped manner when the impeller is in its first position and to displace medium in the vessels from the vessels to the second space in a stepped manner when moving the impeller from its second position to its first position.
Such an embodiment of a device according to the present invention preferably comprises a controllable valve for mutually coupling the first space and the second space by means of this first regenerator. During displacement of medium between the second space and the vessels, this regenerator can easily then be closed off by means of this valve, so that no medium can flow between the first space and the second space. In order to move the impeller, this valve can then be opened in order to mutually couple the first space and the second space by means of this first regenerator.
If such a device operates at similar temperatures to devices according to the prior art, it is possible, for example, to use a valve from the turbodiesel technology for this purpose. However, as has been indicated above, it also possible to operate a device according to the present invention at relatively low temperatures achieving a similar or even higher COP, in which case a less expensive valve may then be used. More specifically, the heating means may comprise a heating element for each vessel which is thermally coupled or couplable to that vessel. By coupling the second space, the associated heating elements of the heating means are coupled to the second space.
A device according to the invention wherein the vessels are couplable to the second space furthermore preferably comprises a valve for each vessel in order to couple this vessel to the second space.
Still more preferably, such a device then comprises a second regenerator for each vessel which is coupled or couplable to the second space and by means of which the respective valve of that vessel is coupled, for alternately coupling the vessels to the second space. By means of this second regenerator, the temperature of the medium in the vessels may be kept lower and the temperature of medium which flows through said valves which are coupled to these vessels is lower, in which case less expensive valves may be used.
Furthermore, the heating means may comprise a heating element for each vessel for heating the respective second regenerator.
In an alternative embodiment of a device according to the present invention, the vessels are not alternately couplable to the second space, but are alternately couplable to the first space in order to displace medium in the second space in a stepped manner, via the regenerator and the first space, from the second space to the vessels when the impeller is in its first position and to displace medium in the vessels from the vessels to the first space in a stepped manner when the impeller is in its second position, so that this medium may be passed to the second space via the regenerator when moving the impeller from its second position to its first position.
In this way, a particularly inexpensive and simple variant of a device according to the present invention is achieved. This device does not require a said controllable valve and no said second regenerators are necessary.
However, it is not possible for any more work to be generated by means of the vessels to make the machine work. Also, the temperature of the medium which enters the regenerator is less constant, because the change in pressure in the spaces is much greater. This change in pressure causes a varying temperature of medium which is sucked in. Therefore, the efficiency of the regenerator is lower. In this case, the mass which passes through the first regenerator is as great as the sum of the masses of the first generator and the second regenerators in an abovementioned embodiment which is provided with said second regenerators.
Such an alternative device according to the invention furthermore preferably comprises a valve for each vessel to couple this vessel to the first space.
Said heating means of a device according to the present invention may comprise, for example, a gas burner. Preferably, these heating means comprise an electric heating element.
In a specific embodiment of a device according to the present invention, the housing and the impeller form a first compressor, the device comprises a second, similar compressor and the heating elements of the first compressor comprise a burner which is thermally coupled to the second space of the first compressor and which comprises a waste gas outlet for discharging waste gases of this burner, wherein this waste gas outlet is coupled to the second compressor as a heating means. This second compressor may be connected in series or in parallel with the first compressor.
Instead of using the first regenerator to cause the displacement movement of the impeller, it is in addition possible to provide the device with, for example, a motor to displace this impeller via a drive shaft. This motor may be used, for example, to start up the operation of the device, after which the latter may continue automatically.
Alternatively or additionally, the device may be provided with a generator which is drivable by means of the displacement movement of the impeller via a drive shaft, so that the device can operate according to the principle of a Stirling engine.
The object of the present invention is furthermore also achieved by providing a heat pump which comprises an above-described device according to the present invention. In addition, the object of the present invention is also achieved by providing a method for thermally compressing a medium in a device for thermally compressing a medium, comprising:
- a housing;
- an impeller which is arranged in the housing for delimiting in the housing: o a first space; o a second space; wherein this impeller is displaceable in the housing between a first position in which the first space is at its smallest and the second space is at its largest, and a second position in which the first space is at its largest and the second space is at its smallest;
- an inlet for letting the medium to be compressed into the first space;
- an outlet for letting the compressed medium out of the first space;
- cooling means which are thermally coupled or couplable to the first space;
- heating means which are thermally coupled or couplable to the second space; and
- a first regenerator by means of which the first space and the second space are coupled or couplable to each other in order to drive the displacement movement of the impeller; wherein this method comprises the following steps:
- step a: heating medium in the second space by means of the heating means to displace the impeller from the first position to the second position, wherein medium to be compressed is let in into the first space via the inlet;
- step b: cooling down medium in the first space by means of the cooling means to displace the impeller from the second position to the first position, wherein the compressed medium is let out of the first space via the outlet.
According to the invention, in this case furthermore:
- when the impeller is in the first position, prior to step a, in a step c, vessels, each filled with pressurized medium, wherein this pressure is lower for each of the vessels than the pressure of medium in the second space, and wherein this pressure deviates for each of the vessels, are alternately coupled to a said space in a stepped manner, starting with the vessel containing the medium under the highest pressure and ending with the vessel containing the medium under the lowest pressure, in order to displace medium in the second space from the second space to the vessels in a stepped manner (optionally via the first space and the regenerator); and
- before or in step b: each of these vessels is alternately coupled to a said space in a stepped manner, starting with the vessel containing the medium under the lowest pressure and ending with the vessel containing the medium under the highest pressure, in order to displace medium in the vessels from the vessels to the second space in a stepped manner (optionally via the first space and the regenerator).
The present invention will now be explained in more detail by means of the following detailed description of a device and a method according to the present invention. The sole aim of this description is to give illustrative examples and to indicate further advantages and features of the present invention and can therefore by no means be interpreted as a limitation of the area of application of the invention or of the patent rights defined in the claims.
In this detailed description, reference numerals are used to refer to the attached drawings, in which:
- Fig. 1 shows the compression cycle of a device according to the prior art;
- Fig. 2 diagrammatically shows the operational principle of a device according to the prior art in various steps;
- Fig. 3 diagrammatically shows a first embodiment of a device for thermally compressing a medium according to the invention, with the impeller in its first position;
- Fig. 4 diagrammatically shows the device from Fig. 3, with the impeller in its second position;
- Figs. 5 to 10 diagrammatically show the various steps for displacing medium in the second space of the device from Fig. 3 to the five vessels of this device;
- Fig. 11 shows the compression cycle of the device from Fig. 3;
- Figs. 12 to 17 diagrammatically show the operational principle of the device from Fig. 3 in various steps; - Fig. 18 diagrammatically shows a second embodiment of a device for thermally compressing a medium according to the invention, with the impeller in its first position.
The illustrated devices (1) are devices (1) for thermally compressing supercritical CO2. Similar devices (1) may also be provided for thermally compressing other media, such as for example gases for diving cylinders, etc.
The illustrated devices (1) according to the present invention comprise a housing (2) and an impeller (3) which is arranged in the housing (2) for delimiting a first space (4) and a second space (5) in the housing (2). In this case, the impeller (3) is displaceable in the housing (2) between a first position in which the first space (4) is at its smallest and the second space (5) is at its largest (as illustrated in Fig. 3) and a second position in which the first space (4) is at its largest and the second space (5) is at its smallest (as illustrated in Figs. 4 and 18).
The impeller (3) is connected to a plunger (drive shaft) (29) which extends through the housing (2) and is couplable to a motor for initiating the displacement movement of the impeller (3). This motor may optionally also be configured as a generator.
In the illustrated device (1), the first space (4) is arranged at the bottom of the housing (2) and the second space (5) is arranged at the top of the housing. However, a reverse arrangement is also possible, analogously to US 2,157,229 A. In the figures, the impeller (3) is upwardly and downwardly displaceable, but another displacement movement is also possible, such as for example a displacement movement analogously to US 3,413,815 A.
Heating means are thermally coupled to the second space (5) for heating medium in this second space (5). Cooling means are thermally coupled to the first space (4) for cooling down medium in this first space (4). These heating means and cooling means are not illustrated, but may, for example, be configured in a way similar to that in the prior art.
The first space (4) and the second space (5) of the device (1) are coupled to each other by means of a first regenerator (15), so that the pressure in both spaces (4, 5) is equal. An inlet (6) into the first space (4) is provided with a non-return valve (20) for letting medium to be compressed into the first space (4). An outlet (7) out of the first space (4) is also provided with a non-return valve (21) in order to let compressed medium out of the first space (5).
Components of this device (1) which are similar to those in the prior art may be configured in similar ways, so that they will not be discussed in any more detail here. Below, only the parts and the operation which deviate from the prior art will be discussed further.
In addition to these components, this device (1) also comprises several vessels (8, 9, 10, 11, 12). These vessels (8, 9, 10, 11, 12) are each filled with pressurized supercritical CO2, wherein this pressure differs for each of the vessels (8, 9, 10, 11, 12) in a stepped manner, as is evident in Figs. 5 to 10. In the first illustrated embodiment (Figs. 3 and 4), each of these vessels (8, 9, 10, 11, 12) is connected to the second space (5) by means of lines (27). In the second illustrated embodiment (Fig. 18), these vessels (8, 9, 10, 11, 12) are connected to the first space (4). A valve (22, 23, 24, 25, 26) is arranged in these lines (27) for each vessel (8, 9, 10, 11, 12), so that the vessels (8, 9, 10, 11, 12) are alternately couplable to the second space (5) in the first illustrated embodiment and to the first space (4) in the second illustrated embodiment. For each of these valves (22, 23, 24, 25, 26), a second regenerator (17) may be arranged for each vessel (8, 9, 10, 11, 12), as is illustrated in the first embodiment, so that it is possible to limit the temperature of medium which flows through the valves (22, 23, 24, 25, 26).
The illustrated devices (1) comprise five vessels (8, 9, 10, 11, 12). In alternative devices (1), it is also possible to provide more or fewer vessels (8, 9, 10, 11, 12).
In the first illustrated embodiment, a controllable valve (16) is furthermore provided in the regenerator (15), by means of which it is possible to open and close the coupling between the first space (4) and the second space (5). Instead of providing this controllable valve (16), the impeller (3) may also be driven by a motor so that it may be moved without medium having to be displaced via the regenerator (15). With the impeller (3) in its first position and the valve (16) in the regenerator (15) in its closed position, the second space (5) in the first illustrated embodiment is first alternately coupled to the vessels (8, 9, 10, 11, 12) (from A to B in Fig. 11) (Figs. 5 to 10; Figs. 12-13) by alternately opening and closing the respective valves (22, 23, 24, 25, 26), starting with the vessel (8) containing CO2 under the highest pressure (Figs. 5-6) and ending with the vessel (12) under the lowest pressure (Figs. 9-10). In each case, the pressure in these vessels (8, 9, 10, 11, 12) increases up to the pressure in the second space (5), wherein the pressure in the second space (5) decreases in a stepped manner. The CO2 expands isentropically.
After the second space (5) has been uncoupled from the last vessel (12), the valve (16) in the regenerator (15) is opened. Since transferring CO2 from the second space (5) to the vessels (8, 9, 10, 11, 12) has made the pressure in the second space (5) lower than in the first space (4), the impeller (3) will partly move upwards (from B to C in Fig. 11) (Figs. 13-14).
The CO2 in the second space (5) is heated up by the heating means, moves through the regenerator (15) from the second space (5) to the first space (4) and expands isochorically. The impeller (3) moves upwards (Figs. 14-15). Heat from the CO2 is stored in the regenerator (15). The pressure in the first space (4) decreases until the inlet pressure is reached.
When the inlet pressure has been reached, the non-return valve (20) in the inlet (6) opens and medium is isobarically sucked into the first space (4) via this inlet (6) (from C to D in Fig. 11) (Figs. 14-15). Then, this non-return valve (20) closes.
The valve (16) in the regenerator (15) is closed. The second space (5) is alternately coupled to the vessels (8, 9, 10, 11, 12) (from D to E in Fig. 11) (Figs. 10 to 5; Figs. 15-16) by alternately opening and closing the respective valves (22, 23, 24, 25, 26), starting with the vessel (12) containing CO2 under the lowest pressure (Figs. 10-9) and ending with the vessel (8) under the highest pressure (Figs. 6-5). In each case, the pressure in these vessels (8, 9, 10, 11, 12) decreases to the pressure in the second space (5), while the pressure in the second space (5) increases in a stepped manner. The impeller (3) moves downwards. Then, the valve (16) in the regenerator (15) is opened.
The medium in the first space (4) is cooled by means of the cooling means (14) and through expansion. Medium is displaced from the first space (4) to the second space (5) and is isochorically compressed in the first space (4) (from E to F in Fig. 11) (Figs. 16-17). Some of the heat of the medium which was stored in the regenerator (15) is recovered. In this case, the pressure in the first space (4) increases until the outlet pressure is reached.
When the outlet pressure has been reached, the non-return valve (21) in the outlet (7) opens and medium leaves the first space (4) at high pressure (from F to A in Fig. 11) (Figs. 17-12).
The valve (16) in the regenerator (15) is closed again and the cycle can repeat.
In the second illustrated embodiment, with the impeller (3) in its first position, the first space (4) is first alternately coupled to the vessels (8, 9, 10, 11, 12) by alternately opening and closing the respective valves (22, 23, 24, 25, 26), starting with the vessel (8) containing CO2 under the highest pressure and ending with the vessel (12) under the lowest pressure. The CO2 from the second space (5) flows to the vessels (8, 9, 10, 11, 12) via the regenerator (15) and the first space (4). In each case, the pressure in these vessels (8, 9, 10, 11, 12) increases to the pressure in the second space (5), while the pressure in the second space (5) decreases in a stepped manner. The CO2 expands isentropically.
Since, due to CO2 having been transferred from the second space (5) to the vessels (8, 9, 10, 11, 12), the pressure in the second space (5) has become lower than in the first space (4), the impeller (3) partly moves upwards.
The CO2 in the second space (5) is heated up by the heating means, moves through the regenerator (15) from the second space (5) to the first space (4) and expands isochorically. The impeller (3) moves upwards. Heat from the CO2 is stored in the regenerator (15). The pressure in the first space (4) decreases until the inlet pressure is reached.
When the inlet pressure has been reached, the non-return valve (20) in the inlet (6) opens and medium is isobarically sucked into the first space (4) via this inlet (6). Then, this non-return valve (20) closes.
The first space (4) is then alternately coupled to the vessels (8, 9, 10, 11, 12), starting with the vessel (12) containing CO2 under the lowest pressure and ending with the vessel (8) under the highest pressure. In each case, the pressure in these vessels (8, 9, 10, 11, 12) decreases to the pressure in the second space (5), while the pressure in the second space (5) increases in a stepped manner. The impeller (3) moves downwards. The medium in the first space (4) is cooled by means of the cooling means (14) and through expansion. Medium is displaced from the first space (4) to the second space (5) and is isochorically compressed in the first space (4). Some of the heat of the medium which was stored in the regenerator (15) is recovered. In this case, the pressure in the first space (4) increases until the outlet pressure is reached.
When the outlet pressure has been reached, the non-return valve (21) in the outlet (7) opens and medium leaves the first space (4) at high pressure.

Claims

1. Device (1) for thermally compressing a medium, comprising: - a housing (2);
- an impeller (3) which is arranged in the housing (2) for delimiting in the housing (2): i. a first space (4); ii. a second space (5); wherein this impeller (3) is displaceable in the housing (2) between a first position in which the first space (4) is at its smallest and the second space (5) is at its largest, and a second position in which the first space (4) is at its largest and the second space (5) is at its smallest; - an inlet (6) for letting the medium to be compressed into the first space (4);
- an outlet (7) for letting the compressed medium out of the first space
(4);
- cooling means which are thermally coupled or couplable to the first space (4);
- heating means which are thermally coupled or couplable to the second space (5); and
- a first regenerator (15) by means of which the first space (4) and the second space (5) are coupled or couplable to each other in order to drive the displacement movement of the impeller (3), characterized in that the device (1) comprises several vessels (8, 9, 10, 11, 12), wherein these vessels (8, 9, 10, 11, 12) are each filled with a pressurized medium, wherein this pressure for each of the vessels (8, 9, 10, 11, 12) deviates in a stepped manner and wherein each of these vessels (8, 9, 10, 11, 12) is alternately couplable to a said space (4, 5) in order to displace medium in the second space (5) from the second space (5) to the vessels (8, 9, 10, 11, 12) in a stepped manner when the impeller (3) is in its first position and to displace medium in the vessels (8, 9, 10, 11, 12) in a stepped manner from the vessels (8, 9, 10, 11, 12) to the second space (5) when the impeller (3) is in its second position.
2. Device (1) according to Claim 1, characterized in that the vessels (8, 9, 10, 11, 12) are alternately couplable to the second space (5) in order to couple these vessels (8, 9, 10, 11, 12) to a said space, this in order to displace medium in the second space (5) from the second space (5) to the vessels (8, 9, 10, 11, 12) in a stepped manner when the impeller (3) is in its first position and to displace medium in the vessels (8, 9, 10, 11, 12) from the vessels (8, 9, 10, 11, 12) to the second space (5) in a stepped manner when moving the impeller (3) from its second position to its first position.
3. Device (1) according to Claim 2, characterized in that the device (1) comprises a controllable valve (16) for mutually coupling the first space (4) and the second space (5) by means of the first regenerator (15).
4. Device (1) according to Claim 2 or 3, characterized in that the heating means for each vessel (8, 9, 10, 11, 12) comprise a heating element which is thermally coupled or couplable to said vessel (8, 9, 10, 11, 12).
5. Device (1) according to one of Claims 2 to 4, characterized in that the device (1) comprises a valve (22, 23, 24, 25, 26) for each vessel (8, 9, 10, 11, 12) for coupling said vessel (8, 9, 10, 11, 12) to the second space (5), and in that the device (1) comprises a second regenerator (17) for each vessel (8, 9, 10, 11, 12) which is coupled or couplable to the second space (5) and with which the corresponding valve (22, 23, 24, 25, 26) is coupled, for alternately coupling the vessels (8, 9, 10, 11, 12) to the second space (5).
6 Device (1) according to Claim 5, characterized in that the heating means for each vessel (8, 9, 10, 11, 12) comprise a heating element for heating the respective second regenerator (17).
7. Device (1) according to Claim 1, characterized in that the vessels (8, 9, 10, 11, 12) are alternately couplable to the first space (4) in order to couple these vessels (8, 9, 10, 11, 12) to a said space in order to displace medium in the second space (5) from the second space (5) to the vessels (8, 9, 10, 11, 12) via the regenerator (15) and the first space (4) in a stepped manner when the impeller (3) is in its first position, and to displace medium in the vessels (8, 9, 10, 11, 12) from the vessels (8, 9, 10, 11, 12) to the second space (5) via the first space (4) and the regenerator (15) in a stepped manner when the impeller (3) is in its second position.
8 Device (1) according to Claim 7, characterized in that the device (1) for each vessel (8, 9, 10, 11, 12) comprises a valve (22, 23, 24, 25, 26) for coupling this vessel (8, 9, 10, 11, 12) to the first space (4).
9. Device (1) according to one of the preceding claims, characterized in that the heating means comprise an electric heating element.
10. Device (1) according to one of the preceding claims, characterized in that the housing (2) and the impeller (3) form a first compressor, in that the device (1) comprises a second, similar compressor (19), in that the heating elements of the first compressor comprise a burner which is thermally coupled to the second space (5) of the first compressor and which comprises a waste gas outlet (18) for discharging waste gases from this burner, wherein this waste gas outlet (18) is coupled to the second compressor (19) as a heating means.
11 Device (1) according to one of the preceding claims, characterized in that the device (1) comprises a motor for driving the displacement movement of the impeller (3).
12. Device (1) according to one of the preceding claims, characterized in that the device (1) comprises a generator which is drivable by the displacement movement of the impeller (3).
13. Heat pump, characterized in that this heat pump comprises a device (1) according to one of the preceding claims. Method for thermally compressing a medium in a device (1) for thermally compressing a medium, comprising:
- a housing (2);
- an impeller (3) which is arranged in the housing (2) for delimiting in the housing (2): i. a first space (4); ii. a second space (5); wherein this impeller (3) is displaceable in the housing (2) between a first position in which the first space (4) is at its smallest and the second space (5) is at its largest and a second position in which the first space (4) is at its largest and the second space (5) is at its smallest;
- an inlet (6) for letting the medium to be compressed into the first space (4); and
- an outlet (7) for letting the compressed medium out of the first space
(4);
- cooling means which are thermally coupled or couplable to the first space (4);
- heating means which are thermally coupled or couplable to the second space (5); and
- a first regenerator (15), by means of which the first space (4) and the second space (5) are mutually couplable for driving the displacement movement of the impeller (3), wherein this method comprises the following steps:
- step a: heating medium in the second space (5) by means of the heating means to displace the impeller (3) from the first position to the second position, wherein medium to be compressed is let into the first space (4) via the inlet (6);
- step b: cooling down medium in the first space (4) by means of the cooling means to displace the impeller (3) from the second position to the first position, wherein the compressed medium is let out of the first space (4) via the outlet (7); characterized in that, furthermore: - when the impeller (3) is in the first position, prior to step a, in a step c, vessels (8, 9, 10, 11, 12), each filled with pressurized medium, wherein this pressure is lower for each of the vessels (8, 9, 10, 11, 12) than the pressure of medium in the second space (5), and wherein this pressure deviates for each of the vessels (8, 9, 10, 11, 12), are alternately coupled to a said space (4, 5) in a stepped manner, starting with the vessel (8) containing the medium under the highest pressure and ending with the vessel (12) containing the medium under the lowest pressure, in order to displace medium in the second space (5) from the second space (5) to the vessels (8, 9, 10, 11, 12) in a stepped manner; and
- before or in step b: each of these vessels (8, 9, 10, 11, 12) is alternately coupled to a said space (4, 5) in a stepped manner, starting with the vessel (12) containing the medium under the lowest pressure and ending with the vessel (8) containing the medium under the highest pressure, in order to displace medium in the vessels (8, 9, 10, 11, 12) from the vessels (8, 9, 10, 11, 12) to the second space (5) in a stepped manner.
PCT/IB2020/060281 2019-11-15 2020-11-03 Device and method for thermally compressing a medium WO2021094867A1 (en)

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BE201905792 2019-11-15
BEBE2019/5792 2019-11-15
BE20205188A BE1027752B1 (en) 2019-11-15 2020-03-23 APPARATUS AND PROCEDURE FOR THERMAL COMPRESSION OF A MEDIUM
BEBE2020/5188 2020-03-23

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2157229A (en) 1935-07-17 1939-05-09 Research Corp Apparatus for compressing gases
US3413815A (en) 1966-05-02 1968-12-03 American Gas Ass Heat-actuated regenerative compressor for refrigerating systems
US4030297A (en) * 1976-06-28 1977-06-21 Ford Motor Company Hydrogen compression system for Stirling engine power control
JPH05240111A (en) * 1991-03-25 1993-09-17 Aisin Seiki Co Ltd Output controller of stirling engine
WO2014023586A1 (en) 2012-08-09 2014-02-13 Boostheat Device for compressing a gaseous fluid
WO2014202885A1 (en) 2013-06-18 2014-12-24 Boostheat Device for thermal compression of a gaseous fluid
WO2015114081A1 (en) * 2014-01-31 2015-08-06 Nuovo Pignone Srl A compressed natural gas system and method
WO2017068066A1 (en) 2015-10-23 2017-04-27 Boostheat Thermodynamic boiler with thermal compressor
WO2018193188A1 (en) 2017-04-20 2018-10-25 Boostheat Thermodynamic co2 boiler and thermal compressor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2157229A (en) 1935-07-17 1939-05-09 Research Corp Apparatus for compressing gases
US3413815A (en) 1966-05-02 1968-12-03 American Gas Ass Heat-actuated regenerative compressor for refrigerating systems
US4030297A (en) * 1976-06-28 1977-06-21 Ford Motor Company Hydrogen compression system for Stirling engine power control
JPH05240111A (en) * 1991-03-25 1993-09-17 Aisin Seiki Co Ltd Output controller of stirling engine
WO2014023586A1 (en) 2012-08-09 2014-02-13 Boostheat Device for compressing a gaseous fluid
WO2014202885A1 (en) 2013-06-18 2014-12-24 Boostheat Device for thermal compression of a gaseous fluid
WO2015114081A1 (en) * 2014-01-31 2015-08-06 Nuovo Pignone Srl A compressed natural gas system and method
WO2017068066A1 (en) 2015-10-23 2017-04-27 Boostheat Thermodynamic boiler with thermal compressor
WO2018193188A1 (en) 2017-04-20 2018-10-25 Boostheat Thermodynamic co2 boiler and thermal compressor

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