An airflow temperature equalizing arrangement for a desiccant dehumidifier duct device, a desiccant dehumidifier duct device and a desiccant dehumidifier

Abstract

The disclosure relates to an airflow temperature equalizing arrangement (1) for a desiccant dehumidifier duct device (2). The airflow temperature equalizing arrangement (1) comprises: a wall structure (4), which at least partly surrounds an airflow temperature equalizing chamber (6); at least one regeneration airflow inlet opening (14, 16, 50) into the airflow temperature equalizing chamber (6); an airflow temperature equalizing chamber outlet opening (8) for a regeneration airflow (10), and a temperature sensor (12) inside the airflow temperature equalizing chamber (6) for measuring the temperature of the regeneration air in the regeneration airflow (10). The disclosure further relates to a desiccant dehumidifier duct device (2) and a desiccant dehumidifier (36).

Description

[0001] An airflow temperature equalizing arrangement for a desiccant dehumidifier duct device, a desiccant dehumidifier duct device and a desiccant dehumidifier

[0002] Technical field

[0003] The present invention relates to an airflow temperature equalizing arrangement for a desiccant dehumidifier duct device. The present invention also relates to a desiccant dehumidifier duct device comprising such an airflow temperature equalizing arrangement. Further, the present invention relates to a desiccant dehumidifier comprising a desiccant rotor, which is rotatably arranged about a center axis of the desiccant rotor; a process air circuit arranged to conduct a process airflow through a process sector of the desiccant rotor; a regeneration air circuit arranged to conduct a regeneration airflow through a regeneration sector of the desiccant rotor; a purge air circuit arranged to conduct a purge airflow through a first purge sector and a second purge sector of the desiccant rotor; an air fan arranged in the regeneration air circuit, which air fan is con-figured to generate the regeneration airflow in the regeneration air circuit and the purge airflow in the purge air circuit, the purge air circuit is arranged to conduct the purge airflow through the first purge sector in a first direction through the desiccant rotor, and through the second purge sector in a second direction through the desiccant rotor, wherein the first direction is opposite to the second direction.

[0004] Background art

[0005] Dehumidifiers, such as desiccant dehumidifiers, are used for separating and removing moisture from air. A desiccant dehumidifier typically comprises a dehumidifying element in the form of a wheel or rotor holding desiccant material, which is effective in attracting and retaining water vapour. The dehumidifier may comprise two sections for the desiccant rotor, a process section and a regeneration section. The airflow to be dehumidified, process air, will pass through the process section and pass through the desiccant rotor. The desiccant material in the rotor extracts moisture from the process air, so that it can leave the rotor as dried air. Simultaneously, the desiccant material is regenerated by a regeneration air flow, which flows through the regeneration section, all the while the desiccant rotor may rotate slowly about its centre axis. The regeneration air in the regeneration airflow is heated in a heater device before passing the regeneration section of the rotor. An air fan may be configured to generate the regeneration airflow through the regeneration section. By means of the simultaneous dehumidification of the process air and regeneration of desiccant material, the dehumidifier can be operated continuously.

[0006] Document US2007056307 discloses an example of a dehumidifier having a desiccant wheel.

[0007] For the regeneration process to be effective, the regeneration air in the regeneration air stream used for regeneration of the desiccant material in the rotor needs to have a relatively high temperature, and will typically need to be heated. The heat in the heater device may be generated by electric power. The heated air, which flows through the regeneration sector, releases humidity from the desiccant rotor and thus dries the rotor.

[0008] An even more effective regeneration process may be achieved if an additional air stream, a purge air stream, is used for regeneration of the desiccant material in the rotor.

[0009] There is an ongoing interest in minimising the energy consumption of the dehumidification process, for economic reasons and for consideration of climate aspects, and in obtaining stable operation of the dehumidification unit. The temperature of the regeneration air may be measured by a temperature sensor arranged in the desiccant dehumidifier. However, to be able to minimising the energy consumption, the knowledge of the correct temperature of the heated regeneration air is essential. In the known desiccant dehumidifiers the correct temperature of the regeneration air may be difficult to measure due to heater devices which create temperature fluctuations and also to disturbances in the reactivation airflow, which results in uneven temperature measurement. Further, evenly blending of purge air with heated regeneration air is difficult. Blending of air demands generally big space, long distance for air flows or high air speeds.

[0010] Despite known solutions in the field, it would be desirable to develop an airflow temperature equalizing arrangement for a desiccant dehumidifier duct device, which overcome or alleviate at least some of the drawbacks of the prior art.

[0011] It is an object of the present invention to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above mentioned problem. A further objective of the present invention is to achieve an airflow temperature equalizing arrangement for a desiccant dehumidifier duct device, which creates conditions to provide correct temperature measurement of heated regeneration air.

[0012] A further objective of the present invention is to achieve a desiccant dehumidifier duct device, which has a compact design, is easy to manufacture, is easy to assembly and is easy to perform maintenance on.

[0013] A further objective of the present invention is to achieve a desiccant dehumidifier, which decreases the energy demands for treatment of the air in a space or a room and thus decreases the heating costs of the regeneration air.

[0014] These objectives are achieved by the airflow temperature equalizing arrangement for a desiccant dehumidifier duct device initially defined, further comprising a wall structure, which at least partly surrounds an airflow temperature equalizing chamber; at least one regeneration airflow inlet opening into the airflow temperature equalizing chamber; an airflow temperature equalizing chamber outlet opening for a regeneration airflow, and a temperature sensor inside the airflow temperature equalizing chamber for measuring the temperature of the regeneration air in the regeneration airflow. The airflow temperature equalizing arrangement will ensure an accurate temperature measurement of the temperature of the heated regeneration air. The airflow temperature equalizing arrangement may be configured to collect heated regeneration air, which has an even temperature suitable for temperature measurement. When a stable and even temperature of the heated regeneration air is measured it may be possible to control the heater device as accurate as possible in order to achieve an increased energy efficiency. The wall structure of the airflow temperature equalizing arrangement is configured the guide the heated regeneration air to an airflow temperature equalizing chamber. The wall structure may create and facilitate the airflow temperature equalizing of the regeneration air in the airflow temperature equalizing chamber. The wall structure may also protect and preserve the movement of the regeneration air in the airflow temperature equalizing chamber from any ambient disturbances. The wall structure may have an inlet and an outlet for the regeneration airflow. The at least one regeneration airflow inlet opening may have a suitable shape, such as a square shape or a round shape. The wall structure may at least partly be a screen, which is configured to guide the regeneration air flow. The temperature sensor may be arranged in the airflow temperature equalizing chamber. The temperature sensor may be arranged in the wall structure and be configured to protrude into the airflow temperature equalizing chamber. The temperature sensor may be at least partly surrounded by the regeneration air and provided with a surface which is in contact with the regeneration air. The temperature sensor may be a part of the wall structure and follow the shape of the wall structure. The regeneration air may enter the airflow temperature equalizing chamber through the at least one regeneration airflow inlet opening. The regeneration air may leave the airflow temperature equalizing chamber through outlet opening. The airflow temperature equalizing chamber outlet opening may face the desiccant rotor. When leaving the outlet opening, the regeneration air from the airflow temperature equalizing chamber may enter the desiccant rotor and pass through the desiccant rotor. The airflow temperature equalizing arrangement for the desiccant dehumidifier duct device creates conditions to provide correct temperature measurement of heated regeneration air. The desiccant dehumidifier duct device provided with such airflow temperature equalizing chamber may have a compact design, may be easy to manufacture, may be easy to assembly and may be easy to perform maintenance on.

[0015] The at least one regeneration airflow inlet opening may comprise a first regeneration airflow inlet opening and a second regeneration airflow inlet opening, wherein the first regeneration airflow inlet opening may be arranged in the vicinity of the temperature sensor and the second regeneration airflow inlet opening may be arranged in a part of the wall structure, which on a first side faces the airflow temperature equalizing chamber and on a second side faces a part of a regeneration air circuit. The first regeneration airflow inlet opening may be arranged adjacent to the position of the temperature sensor, so that the temperature sensor may be exposed to the heated regeneration air. The heater device may be arranged close to the first regeneration airflow inlet opening, so that the regeneration air may have short distance to flow between the position of the heater device and the position of the temperature sensor. The part of the wall structure forming the second regeneration airflow inlet opening may be arranged at a distance from the desiccant rotor, so that the heated regeneration air can pass between that part of the wall structure and the rotor and thus reach the airflow temperature equalizing chamber and the temperature sensor. Further, the second regeneration airflow inlet opening may due to its shape generate a temperature equalizing airflow of the regeneration air and thus a temperature equalizing airflow in the airflow temperature equalizing chamber.

[0016] The first regeneration airflow inlet opening may be arranged in the wall structure. The first regeneration airflow inlet opening may have a shape that facilitates the generation of temperature equalizing airflow in the airflow temperature equalizing chamber. The position and shape of the first and second regeneration airflow inlet openings may together be arranged to create a temperature equalizing airflow of the regeneration air in the airflow temperature equalizing chamber.

[0017] The first regeneration airflow inlet opening may comprise a first airflow temperature equalizing generating element for generating airflow temperature equalizing in a regeneration airflow. The first airflow temperature equalizing generating element may both generate and stimulate the mixing airflow of the regeneration air in the airflow temperature equalizing chamber.

[0018] The airflow temperature equalizing generating element may comprise bars, which are configured to create airflow temperature equalizing of the regeneration airflow when the regeneration airflow is deflected and passes between the bars. The bars may have a flat surface or may have a curved surface, or a combination of flat and curved surfaces. The bars may be provided with deflection elements, which further promotes the creation of airflow temperature equalizing of the regeneration airflow. The bars may also be shaped to stimulate and preserve the temperature equalizing airflow of the regeneration air in the airflow temperature equalizing chamber.

[0019] The second regeneration airflow inlet opening may have a slit shape, which is configured to generate airflow temperature equalizing of a regeneration airflow passing the slit shaped second regeneration airflow inlet opening. The slit shaped second regeneration airflow inlet opening may be arranged between the wall structure and the desiccant rotor. The distance between the wall structure and the rotor and the length of the wall structure facing the rotor may create the slit shaped opening.

[0020] A protection screen may be delimiting the airflow temperature equalizing chamber, which protection screen on a first side faces the airflow temperature equalizing chamber and on a second side faces a part of a purge air circuit, which protection screen is configured to protect the temperature sensor from being exposed to a purge airflow in the purge air circuit. The temperature of the purge air is different from the temperature of the regeneration air. The temperature sensor may therefore be protected by the protection screen from being exposed to the purge air in the purge airflow. The measured temperature by the temperature sensor can therefore be the correct temperature of the heated regeneration air.

[0021] A duct device comprises a housing with an outer wall, wherein the housing further comprises an opening, which is configured to face a desiccant rotor of a desiccant dehumidifier, which opening is divided into a purge airflow inlet opening, a purge airflow outlet opening and a regeneration airflow outlet opening, wherein the housing further comprises a continuous inner wall, which extends in the housing from a position between the purge airflow inlet opening and the regeneration airflow outlet opening, and further to a position at a region between the regeneration airflow outlet opening and the purge airflow outlet opening, wherein the continuous inner wall and the outer wall forms a purge airflow channel, and wherein the purge airflow channel fluidly connects the purge airflow inlet opening and the purge airflow outlet opening. The continuous wall delimits a volume within the housing. The continuous wall guides the regeneration air flow on an inside surface, which is configured to face a desiccant rotor. The regeneration airflow outlet opening is arranged at a position between the purge airflow inlet and outlet openings. The continuous wall may be a separate element from the desiccant dehumidifier duct device or the continuous wall may be integrated in the desiccant dehumidifier duct device.

[0022] The wall structure may comprise a plane, which plane is arranged in the vicinity of the position of the temperature sensor; and which plane is configured to support a temperature equalizing regeneration airflow surrounding the temperature sensor. The plane be positioned adjacent to the first regeneration airflow inlet opening. The plane may be represented by the airflow temperature equalizing generating element. The plane may be represented by a surface of the bars facing the airflow temperature equalizing chamber.

[0023] According to a second aspect there is provided a desiccant dehumidifier duct device comprising an airflow temperature equalizing arrangement, which duct device comprises a housing with an opening, which is configured to face a desiccant rotor of a desiccant dehumidifier; the opening is divided into a purge airflow inlet opening, a purge airflow outlet opening, a regeneration airflow outlet opening and an airflow temperature equalizing chamber outlet opening, and the housing comprises the at least one regeneration airflow inlet opening of the airflow temperature equalizing arrangement. The desiccant dehumidifier duct device provided with such airflow temperature equalizing chamber may have a compact design, may be easy to manufacture, may be easy to assembly and may be easy to perform maintenance on. The inlet and outlet openings for the purge airflow, the outlet for the regeneration airflow and the outlet for the regeneration air in the airflow temperature equalizing chamber are arranged and collected in the duct device. These inlet and outlet openings may all be arranged in a common direction. These inlet and outlet openings may be configured to face the desiccant rotor when mounted in a desiccant dehumidifier. A continuous inner wall may extend in the housing from a position between the purge airflow inlet opening and the regeneration airflow outlet opening, and further to a position at a region between the regeneration airflow outlet opening and the purge airflow outlet opening and the airflow temperature equalizing chamber outlet opening. The continuous wall delimits a volume within the housing. The continuous wall guides the regeneration air flow on an inside surface, which is configured to face a desiccant rotor. The regeneration airflow outlet opening is arranged at a position between the purge airflow inlet and outlet openings. The continuous wall may be a separate element from the desiccant dehumidifier duct device or the continuous wall may be integrated in the desiccant dehumidifier duct device.

[0024] A purge airflow channel may fluidly connect the purge airflow inlet opening and the purge airflow outlet opening. The purge airflow enters the purge airflow inlet channel and flows in the airflow channel towards the purge airflow outlet opening. The purge airflow channel may be arranged in the housing.

[0025] The duct device comprises a housing with an outer wall, and wherein the continuous inner wall and the outer wall forms the purge airflow channel.

[0026] The continuous inner wall may be arranged at a distance from the outer wall. An outer surface of the inner wall and an inner surface of the outer wall may be configured to guide the purge airflow from the purge airflow inlet opening and the purge airflow outlet opening. The heated regeneration air in the regeneration air flow guided by the inside of the continuous inner wall may dissipate heat, which results in heat losses. However, the purge air in the purge airflow guides by the outside surface of the continuous inner wall may reduce the heat dissipation from the continuous inner wall and thus from the regeneration air. Since the purge air in the purge airflow channel has an increased temperature the purge airflow in the purge airflow channel may have a heat insulating effect.

[0027] The continuous inner wall is configured to guide a regeneration airflow from the at least one regeneration airflow inlet opening to the regeneration airflow outlet opening, and the continuous inner wall has heat conducting properties and is configured to conduct heat from regeneration air in the regeneration airflow to purge air in the purge airflow. Due to the heated regeneration air in the regeneration air flow guided by the inside of the continuous inner wall, heat may be conducted to the purge air in the purge airflow by the outside surface of the continuous inner wall. The temperature of the purge air in the purge airflow channel may increase further due to the heat conducting properties the continuous inner wall. The at least one regeneration airflow inlet opening may comprise a main regeneration airflow inlet opening, a first regeneration airflow inlet opening and a second regeneration airflow inlet opening. The main regeneration airflow inlet opening may be arranged adjacent to the volume, which is delimit by the continuous inner wall. The heater device may be arranged close to the main regeneration airflow inlet opening, so that the regeneration air may have short distance to flow between the position of the heater device and the position of the by the continuous inner wall. The first regeneration airflow inlet opening may be arranged adjacent to the position of the airflow temperature equalizing chamber, which may comprise a temperature sensor, so that the temperature sensor may be exposed to the heated regeneration air. The heater device may be arranged close to the first regeneration airflow inlet opening, so that the regeneration air may have short distance to flow between the position of the heater device and the position of the temperature sensor in the airflow temperature equalizing chamber. The part of the wall structure forming the second regeneration airflow inlet opening may be arranged at a distance from the desiccant rotor, so that the heated regeneration air can pass between that part of the wall structure and the rotor and thus reach the airflow temperature equalizing chamber and the temperature sensor. Further, the second regeneration airflow inlet opening may due to its shape generate a temperature equalizing airflow of the regeneration air and thus a temperature equalizing airflow in the airflow temperature equalizing chamber.

[0028] The main regeneration airflow inlet opening may comprise a main airflow temperature equalizing generating element for generating airflow temperature equalizing in the regeneration airflow. The heated regeneration airflow may be a laminated flow when leaving the heater device. The laminated regeneration airflow may result in uneven temperatures sensed by the temperature sensor. The main airflow temperature equalizing generating element may both generate and stimulate a temperature equalizing airflow of the regeneration air in the volume, which is delimit by the continuous inner wall. The main airflow temperature equalizing generating element may comprise bars, which are configured to create airflow temperature equalizing of the regeneration airflow when the regeneration airflow is deflected and passes between the bars. The bars may have a flat surface or may have a curved surface, or a combination of flat and curved surfaces. The bars may be provided with deflection elements, which further promotes the creation of airflow temperature equalizing of the regeneration airflow. The bars may also be shaped to stimulate and preserve the temperature equalizing airflow of the regeneration air in the volume, which is delimit by the continuous inner wall. The desiccant dehumidifier duct device itself may be provided without the airflow temperature equalizing arrangement. The airflow temperature equalizing arrangement may be connected to the desiccant dehumidifier duct device as a separate arrangement. Further, the desiccant dehumidifier duct device itself may be provided without the airflow temperature equalizing chamber and without the airflow temperature equalizing chamber outlet opening. The airflow temperature equalizing chamber and the airflow temperature equalizing chamber outlet opening may be connected to the desiccant dehumidifier duct device as separate arrangements. Further, the first regeneration airflow inlet opening may be provided without the first airflow temperature equalizing generating element, and the main regeneration airflow inlet opening may be provided without the main airflow temperature equalizing generating element. The first airflow temperature equalizing generating element and the main airflow temperature equalizing generating element may be connected to the desiccant dehumidifier duct device as separate arrangements.

[0029] According to a third aspect there is provided a desiccant dehumidifier initially defined, further comprising a desiccant dehumidifier duct device according to the second aspect arranged in the desiccant dehumidifier, wherein the purge airflow inlet opening, the purge airflow outlet opening and the airflow temperature equalizing chamber outlet opening are connected to the purge air circuit, and in that the at least one regeneration airflow inlet opening and regeneration airflow outlet opening are connected to the regeneration air circuit. Such desiccant dehumidifier may comprise a desiccant rotor, which is rotatably arranged about a center axis of the desiccant rotor. A process air circuit may be arranged to conduct a process airflow through a process sector of the desiccant rotor. A regeneration air circuit may be arranged to conduct a regeneration airflow through a regeneration sector of the desiccant rotor. A purge air circuit may be arranged to conduct a purge airflow through a first purge sector and a second purge sector of the desiccant rotor. An air fan may be arranged in the regeneration air circuit, which air fan is configured to generate the regeneration airflow in the regeneration air circuit and the purge airflow in the purge air circuit. The air fan may be arranged upstream or downstream of the desiccant rotor in the regeneration circuit. The purge air circuit may be arranged to conduct the purge airflow through the first purge sector in a first direction through the desiccant rotor, and through the second purge sector in a second direction through the desiccant rotor. The first direction may be configured to be opposite to the second direction. A heater device may be arranged in connection to the regeneration air circuit upstream of the desiccant rotor and downstream of a position where the purge air circuit is connected to the regeneration air circuit. This heater device is configured to increase the temperature of the regeneration air in the regeneration air circuit. Since the heater device is arranged downstream of the position where the purge air circuit is connected to the regeneration air circuit, the purge air will not be heated by the heater device. Instead the purge airflow flowing through the first purge sector may decrease the temperature of that part or section of the desiccant rotor in which the regeneration airflow has passed through the desiccant rotor. The air fan may be arranged upstream of the heater device. The heater device may be arranged upstream of the position where the purge air circuit is connected to the regeneration air circuit.

[0030] The present disclosure will become apparent from the detailed description given below.

[0031] Brief of the

[0032] The above objects, as well as additional objects, features and advantages of the present disclosure, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of example embodiments of the present disclosure, when taken in conjunction with the accompanying drawings.

[0033] Fig. 1 schematically illustrates a view in perspective of desiccant dehumidifier according to an example;

[0034] Fig. 2 schematically illustrates a desiccant dehumidifier according to an example;

[0035] Figures 3 - 5 schematically illustrate desiccant dehumidifier duct devices in front views and in a view in perspective according to examples, and

[0036] Figures 6 and 7 schematically illustrate section views along lines A-A and B-B in fig. 3.

[0037] Detailed description

[0038] The present disclosure will now be described with reference to the accompanying drawings, in which preferred example embodiments of the disclosure are shown. The disclosure may, however, be embodied in other forms and should not be construed as limited to the herein disclosed embodiments. The disclosed embodiments are provided to fully convey the scope of the disclosure to the skilled person.

[0039] Fig. 1 schematically illustrates a view in perspective of desiccant dehumidifier 36 according to an example. The desiccant dehumidifier 36 comprising an airflow temperature equalizing arrangement 1 for a desiccant dehumidifier duct device 2 according to an example. The desiccant dehumidifier comprises a desiccant rotor 34, which is rotatably arranged about a center axis 54 of the desiccant rotor 34. A process air circuit 56 is arranged to conduct a process airflow 58 through a process sector 60 of the desiccant rotor 34. A regeneration air circuit 18 is arranged to conduct a regeneration airflow 10 through a regeneration sector 62 of the desiccant rotor 34. Schematically illustrated is a temperature sensor 12 arranged inside an airflow temperature equalizing chamber 6 for measuring the temperature of the regeneration air in the regeneration airflow 10. A part of the regeneration airflow 10 is linked to the airflow temperature equalizing chamber 6, which is indicated by the arrow 55. A purge air circuit 26 is arranged to conduct a purge airflow 25 through a first purge sector 64 and a second purge sector 66 of the desiccant rotor 34. An air fan 68 is arranged in the regeneration air circuit 18, which air fan 68 is con-figured to generate the regeneration airflow 10 in the regeneration air circuit 18 and the purge airflow 25 in the purge air circuit 26. The purge air circuit 26 is arranged to conduct the purge airflow 25 through the first purge sector 64 in a first direction through the desiccant rotor 34, and through the second purge sector 66 in a second direction through the desiccant rotor 34. The first direction is opposite to the second direction. A desiccant dehumidifier duct device 2 is arranged in the desiccant dehumidifier 36. A heater device 70 is arranged in connection to the regeneration air circuit 18 upstream of the desiccant rotor 34 and downstream of a position where the purge air circuit 26 is connected to the regeneration air circuit 18.

[0040] Fig. 2 schematically illustrates a desiccant dehumidifier 36 according to an example. The desiccant dehumidifier 36 comprising the airflow temperature equalizing arrangement 1 for the desiccant dehumidifier duct device 2 according to an example. The process airflow 58 pass the desiccant rotor 34 in a direction, which may be opposite to the direction of regeneration airflow 10 through the desiccant rotor 34. The regeneration airflow 10 and the purge airflow 25 have a common inlet 72. The purge air circuit 26 is connected to the regeneration air circuit 18 downstream of the heater device 70. Thus, the air from the inlet 72 will be divided into the purge air circuit 26 and the regeneration air circuit 18. After the purge air flow 25 and the regeneration airflow 10 have been separated from each other and have passed the desiccant rotor 34, they will be united into to a common channel 74 in which the air fan 68 is arranged. The purge air flow 25 and the regeneration airflow 10 will leave the common cannel 74 through an outlet 76. The temperature sensor 12 is arranged inside the airflow temperature equalizing chamber 6 for measuring the temperature of the regeneration air in the regeneration airflow 10. The process air circuit 56 is arranged to conduct a process airflow 58 through the process sector 60 of the desiccant rotor 34. The regeneration air circuit 18 is arranged to conduct the regeneration airflow 10 through the regeneration sector 62 of the desiccant rotor 34. The purge air circuit 26 is arranged to conduct a purge airflow 25 through the first purge sector 64 and the second purge sector 66 of the desiccant rotor 34.

[0041] Figures 3 - 5 schematically illustrate a desiccant dehumidifier duct device 2 in front views and in a view of perspective according to examples. The desiccant dehumidifier duct device 2 comprises an airflow temperature equalizing arrangement 1. The duct device 2 comprises a housing 30 with an opening 32, which is configured to face the desiccant rotor 34 (fig. 1 and 2) of the desiccant dehumidifier 36. The opening 32 is divided into a purge airflow inlet opening 38, a purge airflow outlet opening 40, a regeneration airflow outlet opening 42 and an airflow temperature equalizing chamber outlet opening 8. Further, the housing 30 comprises the at least one regeneration airflow inlet opening 14, 16, 50 of the airflow temperature equalizing arrangement 1. A continuous inner wall 45 extends in the housing 30 from a position between the purge airflow inlet opening 38 and the regeneration airflow outlet opening 42, and further to a position at a region between the regeneration airflow outlet opening 42 and the purge airflow outlet opening 40 and the airflow temperature equalizing chamber outlet opening 8. A purge airflow channel 46 connects the purge airflow inlet opening 38 and the purge airflow outlet opening 40. The purge airflow channel 46 extends between an outer wall 48 of the housing 30 and the continuous inner wall 45. The at least one regeneration airflow inlet opening 14, 16, 50 comprises a main regeneration airflow inlet opening 50, a first regeneration airflow inlet opening 14 and a second regeneration airflow inlet opening 16. The main regeneration airflow inlet opening 50 comprises a main airflow temperature equalizing generating element 52 for generating airflow temperature equalizing in the regeneration airflow 10. The purge airflow inlet opening 38, the purge airflow outlet opening 40 and the airflow temperature equalizing chamber outlet opening 8 are connected to the purge air circuit 26. The at least one regeneration airflow inlet opening 14, 16, 50 and regeneration airflow outlet opening 42 are connected to the regeneration air circuit 18. The airflow temperature equalizing arrangement 1 comprises a wall structure 4. The wall structure 4 at least partly surrounds an airflow temperature equalizing chamber 6, the at least one regeneration airflow inlet opening 14, 16, 50 into the airflow temperature equalizing chamber 6, the airflow temperature equalizing chamber outlet opening 8 for the regeneration airflow 10, and a temperature sensor 12 inside the airflow temperature equalizing chamber 6 for measuring the temperature of the regeneration air in the regeneration airflow 10. The at least one regeneration airflow inlet opening 14, 16, 50 comprises the first regeneration airflow inlet opening 14 and the second regeneration airflow inlet opening 16. The first regeneration airflow inlet opening 14 is arranged in the vicinity of the temperature sensor 12. The second regeneration airflow inlet opening 16 is arranged in a part of the wall structure 4, which on a first side faces the airflow temperature equalizing chamber 6 and on a second side faces a part of the regeneration air circuit 18. The first regeneration airflow inlet opening 14 is arranged in the wall structure 4. The first regeneration airflow inlet opening 14 comprises a first airflow temperature equalizing generating element 20 for generating airflow temperature equalizing in a regeneration airflow 10. The first airflow temperature equalizing generating element 20 comprises bars 22, which are configured to create airflow temperature equalizing of the regeneration airflow 10 when the regeneration airflow 10 is deflected and passes between the bars 22. The second regeneration airflow inlet opening 16 has a slit shape, which is configured to generate airflow temperature equalizing of the regeneration airflow 10 passing the slit shaped second regeneration airflow inlet opening 16. Upstream of the first regeneration airflow inlet opening 14 and the main regeneration airflow inlet opening 14 is the heater device 70 arranged. In fig. 4, the heater device 70 is arranged in a heater housing 78. The regeneration air in the regeneration airflow 10 is heated when passing through the heater device 70. A protection screen 24 is delimiting the airflow temperature equalizing chamber 6, which protection screen 24 on a first side faces the airflow temperature equalizing chamber 6 and on a second side faces a part of a purge air circuit 26. The protection screen 24 is configured to protect the temperature sensor 12 from being exposed to a purge airflow 25 in the purge air circuit 26. The wall structure 4 comprises a plane 28, which plane is arranged in the vicinity of the position of the temperature sensor 12. The plane 28 is configured to support a temperature equalizing regeneration airflow 10 surrounding the temperature sensor 12.

[0042] Figures 6 and 7 schematically illustrate section views along lines A-A and B-B in fig. 3. In fig. 6 the purge airflow channel 46, which extends between the outer wall 48 of the housing 30 and the continuous inner wall 45 is shown. In fig. 7 the second regeneration airflow inlet opening 16, which has a slit shape is shown. Further, the purge airflow channel 46, which extends between the outer wall 48 of the housing 30 and the continuous inner wall 45 is shown. Also, a part of the protection screen 24 is shown in fig. 7.

Claims

CLAIMS1. An airflow temperature equalizing arrangement (1) for a desiccant dehumidifier duct device (2), characterized in that the airflow temperature equalizing arrangement (1) comprises: a wall structure (4), which at least partly surrounds an airflow temperature equalizing chamber (6); at least one regeneration airflow inlet opening (14, 16, 50) into the airflow temperature equalizing chamber (6); an airflow temperature equalizing chamber outlet opening (8) for a regeneration airflow (10), and a temperature sensor (12) inside the airflow temperature equalizing chamber (6) for measuring the temperature of the regeneration air in the regeneration airflow (10).

2. The arrangement (1) according to claim 1, wherein the at least one regeneration airflow inlet opening (14, 16, 50) comprises a first regeneration airflow inlet opening (14) and a second regeneration airflow inlet opening (16), wherein the first regeneration airflow inlet opening (14) is arranged in the vicinity of the temperature sensor (12) and the second regeneration airflow inlet opening (16) is arranged in a part of the wall structure (4), which on a first side faces the airflow temperature equalizing chamber (6) and on a second side faces a part of a regeneration air circuit (18).

3. The arrangement (1) according to claim 2, wherein the first regeneration airflow inlet opening (14) is arranged in the wall structure (4).

4. The arrangement (1) according to any one of the claims 2 and 3, wherein the first regeneration airflow inlet opening (14) comprises a first airflow temperature equalizing generating element (20) for generating airflow temperature equalizing in a regeneration airflow (10).

5. The arrangement (1) according to claim 4, wherein the airflow temperature equalizing generating element (20) comprises bars (22), which are configured to create airflow temperature equalizing of the regeneration airflow (10) when the regeneration airflow (10) is deflected and passes between the bars (22).

6. The arrangement (1) according to any one of the claims 2 - 5, wherein the second regeneration airflow inlet opening (16) has a slit shape, which is configured to generate airflow temperature equalizing of a regeneration airflow (10) passing the slit shaped second regeneration airflow inlet opening (16).

7. The arrangement (1) according to any one of the preceding claims, wherein a protection screen (24) is delimiting the airflow temperature equalizing chamber (6), which protection screen (24) on a first side faces the airflow temperature equalizing chamber (6) and on a second side faces a part of a purge air circuit (26), which protection screen (24) is configured to protect the temperature sensor (12) from being exposed to a purge airflow (25) in the purge air circuit (26).

8. The arrangement (1) according to claim 7, wherein a duct device (2) comprises a housing (30) with an outer wall (48), wherein the housing (30) further comprises an opening (32), which is configured to face a desiccant rotor (34) of a desiccant dehumidifier (36), which opening (32) is divided into a purge airflow inlet opening (38), a purge airflow outlet opening (40) and a regeneration airflow outlet opening (42), wherein the housing (30) further comprises a continuous inner wall (45), which extends in the housing (30) from a position between the purge airflow inlet opening (38) and the regeneration airflow outlet opening (42), and further to a position at a region between the regeneration airflow outlet opening (42) and the purge airflow outlet opening (40), wherein the continuous inner wall (45) and the outer wall (48) forms a purge airflow channel (46), and wherein the purge airflow channel (46) fluidly connects the purge airflow inlet opening (38) and the purge airflow outlet opening (40).

9. The arrangement (1) according to any one of the preceding claims, wherein the wall structure (4) comprises a plane (28), which plane is arranged in the vicinity of the position of the temperature sensor (12); and which plane (28) is configured to support a temperature equalizing regeneration airflow (10) surrounding the temperature sensor (12).

10. A desiccant dehumidifier duct device (2) comprising an airflow temperature equalizing arrangement (1) according to any one of the preceding claims, characterized in that the duct device (2) comprises a housing (30) with an opening (32), which is configured to face a desiccant rotor (34) of a desiccant dehumidifier (36);that the opening (32) is divided into a purge airflow inlet opening (38), a purge air-flow outlet opening (40), a regeneration airflow outlet opening (42) and an airflow temperature equalizing chamber outlet opening (8), and in that the housing (30) comprises the at least one regeneration airflow inlet opening (14, 16, 50) of the airflow temperature equalizing arrangement (1).

11. The duct device (2) according to claim 10, wherein a continuous inner wall (45) extends in the housing (30) from a position between the purge airflow inlet opening (38) and the regeneration airflow outlet opening (42), and further to a position at a region between the regeneration airflow outlet opening (42) and the purge airflow outlet opening (40) and the airflow temperature equalizing chamber outlet opening (8).

12. The duct device (2) according to any one of the claims 10 and 11, wherein a purge airflow channel (46) fluidly connects the purge airflow inlet opening (38) and the purge airflow outlet opening (40).

13. The duct device (2) according to claims 11 and 12, wherein the duct device (2) comprises a housing (30) with an outer wall (48), and wherein the continuous inner wall (45) and the outer wall (48) forms the purge airflow channel (46).

14. The duct device (2) according to claims 11 - 13, wherein the continuous inner wall (45) is configured to guide a regeneration airflow from the at least one regeneration airflow inlet opening (14, 16, 50) to the regeneration airflow outlet opening (42), and wherein the continuous inner wall (45) has heat conducting properties and is configured to conduct heat from regeneration air in the regeneration airflow to purge air in the purge airflow.

15. The duct device (2) according to any one of the claims 10 - 14, wherein the at least one regeneration airflow inlet opening (14, 16, 50) comprises a main regeneration airflow inlet opening (50), a first regeneration airflow inlet opening (14) and a second regeneration airflow inlet opening (16).

16. The duct device (2) according to e claim 15, wherein the main regeneration airflow inlet opening (50) comprises a main airflow temperature equalizing generating element (52) for generating airflow temperature equalizing in the regeneration airflow (10).

17. A desiccant dehumidifier (36), comprising a desiccant dehumidifier duct device (2) according to any one of the claims 10 - 16: a desiccant rotor (34), which is rotatably arranged about a centre axis (54) of the desiccant rotor (34); a process air circuit (56) arranged to conduct a process airflow (58) through a process sector (60) of the desiccant rotor (34); a regeneration air circuit (18) arranged to conduct a regeneration airflow (10) through a regeneration sector (62) of the desiccant rotor (34); a purge air circuit (26) arranged to conduct a purge airflow (25) through a first purge sector (64) and a second purge sector (66) of the desiccant rotor (34); an air fan (68) arranged in the regeneration air circuit (18), which air fan (68) is configured to generate the regeneration airflow (10) in the regeneration air circuit (18) and the purge airflow (25) in the purge air circuit (26), the purge air circuit (26) is arranged to conduct the purge airflow (25) through the first purge sector (64) in a first direction through the desiccant rotor (34), and through the second purge sector (66) in a second direction through the desiccant rotor (34), wherein the first direction is opposite to the second direction, characterized in that the purge airflow inlet opening (38), the purge airflow outlet opening (40) and the airflow temperature equalizing chamber outlet opening (8) are connected to the purge air circuit (26), and in that the at least one regeneration airflow inlet opening (14, 16, 50) and regeneration airflow outlet opening (42) are connected to the regeneration air circuit (18).

Images