NL2018604B1 - Heat exchanger - Google Patents

Abstract

The invention relates to a heat exchanger, comprising: - a sealed reservoir filled with a first medium; - at least one channel arranged in the reservoir, flowed from an entrance to an exit with a second medium; - at least one light source arranged in the reservoir in the first medium, such as a spiral lamp; and - reflecting means, comprising a layer such as a mirror or metal layer arranged on at least one of the inner wall of the reservoir and an at least one partition arranged in the first medium.

Description

Patent center

2018604

(21) Application number: 2018604 © Application submitted: March 29, 2017 (g) Int. CL:

F24H 1/10 (2018.01) F24H 1/43 (2018.01) F24H 9/20 (2018.01) H05B 3/00 (2018.01)

(4 ^ Request registered: (73) Patent holder (s): October 10, 2018 Wilhelmus Josephus Maria Schottman at Hardenberg. (43) Application published: (72) Inventor (s): (/ 7) Patent granted: Wilhelmus Josephus Maria Schottman October 10, 2018 at Hardenberg. (45) Patent issued: November 26, 2018 (74) Agent: ir. B.J. 't Jong in Enschede.

© Heat exchanger © The invention relates to a heat exchanger, comprising:

- a sealed reservoir filled with a first medium;

- at least one channel arranged in the reservoir, flowed from an entrance to an exit with a second medium;

- at least one light source arranged in the reservoir in the first medium, such as a spiral lamp; and

- reflecting means, comprising a layer such as a mirror or metal layer, arranged on at least one of the inner wall of the reservoir and an at least one partition arranged in the first medium.

NL Bl 2018604

This patent has been granted regardless of the attached result of the research into the state of the art and written opinion. The patent corresponds to the documents originally submitted.

Heat exchanger

The invention relates to a heat exchanger.

Traditionally, gas is used for heating rooms, in particular natural gas. Carbon dioxide is released during the combustion of natural gas, which is associated with environmental damage, in particular climate change. The extraction of natural gas is also associated with damage, in particular landslides. For that reason, alternatives to heating are being sought.

An example of such an alternative is described in Dutch patent NL 2011831. This describes a device with a refrigerant-carrying circuit, for example used in the cooling of supermarkets and a heat-carrying circuit, for example used for heating the same supermarket, both of which circuits are in heat-exchanging contact in order to provide energy savings.

Such a system provides savings in the amount of natural gas required, but a significant dependence on natural gas still remains.

The object of the invention is to reduce or even prevent the above problems.

This object is achieved with the aid of a heat exchanger, comprising:

- a sealed reservoir filled with a first medium;

- at least one channel arranged in the reservoir, flowed from an entrance to an exit with a second medium;

- at least one light source arranged in the reservoir in the first medium, such as a spiral lamp; and

- reflecting means, comprising a layer such as a mirror or metal layer, arranged on at least one of the inner wall of the reservoir and an at least one partition arranged in the first medium.

In the heat exchanger according to the invention, light and heat are generated with the light source. The energy resulting therefrom is transferred via the first medium to the channel which is in heat-exchanging contact with the first medium and the second medium flowing through it, which is separated from the first medium and which heats up as a result. By providing reflecting means, the energy originating from the light source is reflected and possibly as it were blown up.

The reflection means can consist of a layer applied to the inner wall of the reservoir and / or one or more optionally placed partitions in the first medium, however, this inner wall or optional partitions can also consist entirely of these materials. A metal layer is in particular also understood to mean a silver foil or an alloy such as stainless or stainless steel. The partitions are preferably provided with the layer on both sides, so that reflection means are present in both compartments separated by the parting. Full coverage of the bulkheads with the layer is preferred to maximize efficiency.

The use of a spiral lamp as a light source has led to favorable results, in particular a spiral lamp of 800 Watt. If one or more partitions are provided, then at least one such light source is preferably included in each compartment created by these partitions. The lamps preferably have a core temperature of at least 400 degrees Celsius for a sufficient heat transfer. The lamps preferably have a warm-up time of 3 seconds or less to ensure a sufficiently fast switch-on. It has been found that placing at least three of such lamps provides a sufficient supply of heat for most applications.

For good heat transfer, the wall of the channel is preferably made of a suitable material and preferably suitable metal, such as for example copper.

The first medium can for example be or comprise air or water. The second medium comprises and is preferably substantially composed of water.

The heat exchanger can be connected with the output to a heat-consuming device, such as, for example, a radiator, in which (a part) of the heat transferred to the second medium in the heat exchanger is consumed. If, after passing through the heat-consuming device, heat remains (for example, because the second medium is even warmer than 120 degrees Celsius), a device can be placed further downstream of the heat-requiring device which converts this heat into energy, such as, for example, a turbine.

The heat exchanger according to the invention is used particularly advantageously with the device from NL 2011831 as described above, wherein the heat exchanger according to the invention can for instance be arranged in the heat-carrying circuit, or can replace this circuit.

The heat exchanger preferably also comprises at least one of a pressure meter and an overheating protection, which ensures that the heat exchanger is switched off if it is determined with the aid of a thermometer that a pre-set temperature, for example in the second medium, has been reached.

It is possible that one channel is arranged in the reservoir, but it is possible to accommodate several channels in parallel in the reservoir. In the case of, for example, two channels, there is a preference for using a first channel with a large contact surface connected to a heat-consuming device with a relatively large heat requirement, together with a second channel with a smaller contact surface, connected to a heat-consuming device with a smaller heat requirement, in order to distribute the heat output as required. The second channel can for instance be connected from the outlet to a device for heating tap water.

In a first preferred embodiment of the heat exchanger according to the invention, the heat exchanger comprises an elongate element arranged in the first medium, wherein the at least one partition extends between the inner wall of the reservoir and the elongate element, for dividing the reservoir into a plurality of compartments.

The elongated element is arranged in the first medium, and the baffles extend between the elongated element and the inner wall of the reservoir, and are preferably fixed to the elongated element and / or the inner wall. The reservoir is hereby subdivided into compartments or preferably separated rooms. The channel preferably runs through each of these compartments and in preferably each compartment a light source is provided to increase the efficiency.

The elongate element and the partitions are preferably arranged in the reservoir such that compartments are formed with substantially the same volume.

If a plurality of channels extend through the reservoir, said plurality of channels each comprising an elongate member, then these elongated members preferably run parallel and abut each other to make the channels compact without obstructing the lamps.

In a second preferred embodiment of the heat exchanger according to the invention, the channel comprises an elongated tube, which extends through the first medium.

An elongated tube is inexpensive in production and requires few specific operations and can be used to connect another part of the channel to or towards the entrance or exit.

In a third preferred embodiment of the heat exchanger according to the invention, the elongate element is the elongated tube.

If the elongated element is the elongated tube, the number of elements in the first medium is reduced. This reduces the production costs of the heat exchanger, and moreover can improve the heat transfer to the second medium compared to a situation where the elongate element is not the elongated tube, in which case a situation could occur that heat is lost via the elongate element .

In a fourth preferred embodiment of the heat exchanger according to the invention, the channel comprises a spiral-shaped part with a number of revolutions extending above each other.

The use of a helical or, in other words, helical part has the advantage that the channel is in heat-exchanging contact with the first medium over a large area within the reservoir, and therefore the efficiency is increased, while a spiral part moreover has an organized and has a regular structure, making it easier to maintain such as cleaning. Spiral is understood to mean not only a spiral with round rotations but also a spiral with other rotations (for example polygonal rotations).

If several channels are arranged in the reservoir, the coil connected to the heat-consuming device with the lowest consumption preferably has a smaller radius than the coil connected to the heat-consuming device with a greater consumption, in order to reduce the heat present on consumption. distribute evenly.

In a fifth preferred embodiment of the heat exchanger according to the invention, the revolutions are pressed onto each other, and preferably attached to each other with adhesives, such as tin solder.

By pressing the revolutions running one above the other on top of each other, the amount of second medium in the reservoir is increased, which increases the heat transfer. Adhering these revolutions to each other with adhesives such as tin solder ensures that the revolutions remain in this configuration, which increases the continuity of the heat exchanger in operation.

In a sixth preferred embodiment of the heat exchanger according to the invention, the spiral-shaped part extends along the inner wall of the reservoir.

When the spiral part extends along the inner wall of the reservoir, or more particularly, when the center of the revolutions of the spiral part substantially coincides with the center of the reservoir and thus the spiral part substantially along the inner wall of the reservoir , a good heat transfer from first medium to second medium is achieved.

The shape of the spiral-shaped part preferably matches the shape of the inner wall of the reservoir to achieve a good heat transfer.

In a seventh preferred embodiment of the heat exchanger according to the invention, the heat exchanger comprises a bottom, a lid, and a peripheral wall arranged between the bottom and lid, and the peripheral wall is preferably cylindrical.

Although other forms of the reservoir are also possible, a reservoir with a flat and parallel bottom and lid and a circumferential wall extending therebetween is preferred, because such a heat exchanger is more regular in shape and therefore easier to place without creating dead spaces.

A cylindrical reservoir is herein preferred because it is thereby possible for the elongate element to run from near the center of the round bottom to the round lid, wherein the partitions are arranged regularly distributed around the elongate element. This increases the return.

In an eighth preferred embodiment of the heat exchanger according to the invention, the at least one partition extends from the bottom to the cover.

When the partitions extend from the bottom to the cover, which also includes extending over a substantial part between bottom and cover, the first medium is largely subdivided into compartments, which increases the efficiency.

In a ninth preferred embodiment of the heat exchanger according to the invention, the elongated tube is perpendicular to the lid, and the channel extends from near the edge of the lid, via the spiral part to near the bottom, and from near the bottom via the elongated tube towards the center of the lid.

Such an embodiment has been found to provide good efficiency and that only 2.5 to 2.8 kWh of energy is still required to obtain an amount of heat equivalent to the heat output of 1 m ³ gas, compared to about 8.7 kWh for a traditional electric central heating.

In a tenth preferred embodiment of the heat exchanger according to the invention, a valve with a controller is arranged near the outlet.

By providing a valve in or near the outlet, it is possible to close the outlet, and more particularly to bring the valve alternately towards the closed position for some time, and then again for some (possibly different) time ( continue). By bringing the valve in the outlet towards the closed position for some time, the contact time of the second medium in the heat exchanger is increased, and the temperature of the second medium therefore increases. By subsequently opening the valve for some time it is then possible to design the second medium for further use. It is advisable to control this closure with a controller in order to achieve an optimum temperature. Such a combination can for instance comprise a solenoid valve with a pulse counter.

It can be advantageous in any case not to completely close the valve, because this causes the passage of second medium through the outlet to temporarily stop.

In an eleventh preferred embodiment of the heat exchanger according to the invention, the controller is set to open and close the valve at intervals between 10 and 40 seconds.

It has been found that choosing the time between 10 and 40 seconds described above contributes to a sufficient rise in the temperature at the output, without causing a shortage of heated second medium in most cases.

In a twelfth preferred embodiment of the heat exchanger according to the invention, the heat exchanger further comprises an outer wall arranged around the reservoir at a distance from the reservoir

By providing an outer wall around the reservoir alongside the wall with an intermediate space under reduced pressure between them, the risk of leakage of developed heat is reduced.

In a thirteenth preferred embodiment of the heat exchanger according to the invention, there is an underpressure in at least one of the reservoir and the space between the reservoir and the outer wall, preferably of at least about 1 bar.

By reducing the pressure in one of these spaces, but preferably both spaces, the efficiency of the transfer is further increased. Also, in the case of underpressure in the reservoir, the chance of heat leaking away is reduced because long waves are broken by the underpressure. Moreover, the risk of overheating the wiring of the lamps is reduced.

The reservoir and / or the outer wall of the heat exchanger are preferably constructed from several parts so that they can easily be taken in and apart, which simplifies maintenance, such as replacing the lamps. If underpressure prevails in some space in the heat exchanger, it is advantageous for this purpose to use a seal such as O-rings.

These and other aspects of the invention are further elucidated with reference to the accompanying figures.

Figure 1 shows a perspective view of a cut-through heat exchanger according to the invention.

Figure 2 shows a schematic top view of the heat exchanger according to Figure 1 with the cover removed.

Figure 3 shows a flow diagram for the heat exchanger according to Figure 1.

Figure 4 shows the development of the temperature at the output with respect to the time when the valve with controller is used.

Figure 5 shows a cross-sectional variant of a heat exchanger according to the invention.

Figure 1 shows one half of a heat exchanger 1. The heat exchanger 1 comprises a reservoir 2 with a bottom 3, a lid 4 and a circumferential wall 5 extending therebetween, which is covered on the inside with silver foil. Light sources (not shown) are provided in reservoir 2. A channel 8 separated from the contents of reservoir 2 runs from an inlet 6 to outlet 7. The channel 8 is in heat-exchanging contact with the contents of reservoir 2. From the entrance 6, the channel first comprises a spiral-shaped part 9 with windings 10 pressed onto each other, which are adhered to each other by means of tin solder 11. The spiral-shaped part 9 runs from cover 4 towards bottom 3, and from there connects via elongation 12 to elongated tube 13, which terminates in outlet 7. Around elongated tube 13 are regularly distributed a number of baffles are provided, baffles 14, 15 of which are shown, so that in reservoir 2 a number of compartments 16, 17, 18 with a similar volume is formed. An outer wall 19 is furthermore arranged around peripheral wall 5, with an insulating layer 20 between peripheral wall 5 and outer wall 19.

Figure 2 shows a top view of heat exchanger with peripheral wall 5, outer wall 19 and insulating layer 20, elongated tube 13, and partitions 14, 15, 21, 22, which extend between tube 13 and peripheral wall 5. The partitions 16, 17, 18, 23. Spiral lamps 24, 25, 26, 27 are arranged in the compartments 16, 17, 18, 23.

Figure 3 shows heat exchanger 1 with input 6 and output 7 and the magnetic valve 28 disposed near output 7, the position of which is controlled by a controller 29 connected to valve, which is always selected for the same interval from the range between the 10 and 40 second valve 28 closes or opens.

Figure 4 shows how the temperature of the second medium develops by this control of valve 28 by controller 29 at point 30. During a time period t1, during which the valve 28 of the fully opened position is gradually closed, the temperature increases while in time period t2, during which the valve is brought from a substantially closed position to the fully opened position, the temperature drops.

Figure 5 shows a cross-section from the top of a variant 50 of a heat exchanger according to the invention. The heat exchanger 50 comprises an outer wall 51, an inner wall 52, a space 53 extending therebetween, which is under reduced pressure. Two channels extend within the inner wall 52. The first channel is composed of a spiral-shaped part 54 and elongated part 55 connected to the spiral-shaped part 54. The second channel is composed of a spiral-shaped part 56 and an elongated part 57 connected to the spiral-shaped part 56. The radius R2 of spiral-shaped part 56 is smaller than the radius R1 of spiral-shaped part 54. Underpressure prevails around channel parts 54, 55, 56, 57, 58 in the reservoir 59. Bulkheads 60 are provided in reservoir 59 through which the spiral-shaped parts 54, 56 protrude in a manner similar to that shown in Figure 1. This embodiment 50 is thus virtually identical to the embodiment 1, but has two channels instead of one. In the embodiment 50 the lamps are also placed between the partitions 60 as described with reference to figure 2.

Claims (14)

Conclusions 1. Heat exchanger, comprising: - a sealed reservoir filled with a first medium; - at least one channel arranged in the reservoir, flowed from an entrance to an exit with a second medium; - at least one light source arranged in the reservoir in the first medium, such as a spiral lamp; and - reflecting means, comprising a layer such as a mirror or metal layer, arranged on at least one of the inner wall of the reservoir and an at least one partition arranged in the first medium. A heat exchanger according to claim 1, wherein the heat exchanger comprises an elongate element arranged in the first medium, the at least one partition extending between the inner wall of the reservoir and the elongated element, for dividing the reservoir into a number of compartments. The heat exchanger according to claim 1 or 2, wherein the channel comprises an elongated tube which extends through the first medium. The heat exchanger according to claims 2 and 3, wherein the elongate element is the elongated tube. A heat exchanger according to any one of the preceding claims, wherein the channel comprises a spiral-shaped part with a number of revolutions extending above each other. A heat exchanger according to claim 5, wherein the revolutions are pressed onto each other, and are preferably attached to each other with adhesives, such as tin solder. A heat exchanger according to claim 5 or 6, wherein the spiral-shaped part extends along the inner wall of the reservoir. A heat exchanger according to any one of the preceding claims, wherein the heat exchanger comprises a bottom, a lid, and a peripheral wall arranged between the bottom and lid, and wherein the peripheral wall is preferably cylindrical. The heat exchanger according to claim 8, wherein the at least one baffle extends from the bottom to the lid. A heat exchanger according to claim 4, any of claims 5 to 7, and claim 8 or 9, wherein the elongated tube is perpendicular to the lid, and wherein the channel extends from near the edge of the lid via the spiral part to near the bottom, and from near the bottom via the elongated tube to near the center of the lid. A heat exchanger according to any one of the preceding claims, wherein a valve with a controller is arranged near the outlet. A heat exchanger according to claim 11, wherein the controller is set to open and close the valve at intervals between 10 and 40 seconds. A heat exchanger according to any one of the preceding claims, further comprising an outer wall arranged around the reservoir at a distance from the reservoir. A heat exchanger according to any one of the preceding claims, wherein a negative pressure prevails in at least one of the reservoir and the space between the reservoir and the outer wall, preferably of at least about 1 bar. 1/2 ια. 1 2/2