Description:FIELD
The present disclosure relates to sealing members, more particularly relates to sealing members in desiccant dehumidifiers for preventing airflow leakage.

BACKGROUND
Desiccant-based rotary dehumidifiers are widely used for removing moisture from air in applications requiring precise humidity control, such as cleanrooms, pharmaceutical environments, and industrial process zones. These systems typically include a desiccant-impregnated rotor that rotates through multiple functional zones, such as a process air zone, where ambient or return air is dehumidified; one or more regeneration zones, where heated air removes the moisture from the desiccant matrix.

A critical challenge in the performance and efficiency of such systems arises from leakage of air between adjacent zones (inter-zonal leakage) and leakage across the axial ends or faces of the rotor (side leakage). Ideally, the airflow paths should be strictly isolated to ensure that each zone operates within its designated function without unintended air migration between or out of the rotor zones.

US5373704 describes a rotary desiccant dehumidifier with radial partitions that divide the rotor into process and regeneration sectors, and has provided a sealing arrangement intended to restrict airflow only around the desiccant wheel.

JP2013184086A discloses a dehumidifier system in which specific angular regions of a rotary desiccant rotor are assigned to process and regeneration airflows, where again has provided a sealing arrangement intended to restrict airflow only around the desiccant wheel.

However, both US5373704, and JP2013184086A do not disclose any provisions for physical sealing between the different zones or regions, and hence susceptible to inter-zonal air migration and leakage across the rotor boundaries.

IN497796A1 describes a rotary desiccant wheel system with multiple airflow sectors and sealing features designed to separate process and regeneration air streams. Although the patent introduces dedicated flow partitions, it relies on sealing techniques that do not provide optimum airflow leakage protection both radially and axially.

Accordingly, there remains a need for an improved sealing mechanism that minimizes or eliminates leakage across the axial and radial sides of the rotor, ensuring greater efficiency, reduced energy loss, and reliable long-term humidity control.

SUMMARY
The present disclosure provides a desiccant dehumidifier system (100) configured to achieve high-efficiency moisture removal with enhanced sealing performance between process and regeneration airflow zones, as well as along the rotor’s axial surfaces. The system includes a rotor (118) having a matrix of parallel desiccant-filled channels, rotatably supported between a first side wall (110) and a second side wall (114) of a housing (104). The rotor moves through a plurality of angularly defined zones, including a process inlet zone (144), a process outlet zone (152), a regeneration inlet zone (156), and a regeneration outlet zone (146), enabling continuous adsorption of moisture from a humid process inlet air (102a) generating dehumidified process outlet air (102b) and desorption of moisture by a preheated regeneration air (103a) that exits as humid regeneration air (103b).

To minimize air leakage and enhance zone isolation, the system employs a set of coordinated sealing assemblies. Double-p-type seal members (162a, 162b) are mounted within circumferential lip members (112, 116) on the side walls and are clamped and compressed against L-flanges (136, 140) provided on the circumferential edges (134, 138) of the rotor. Each double-p-type seal includes a flange portion (164), which is mechanically secured in place using metallic clamps (168), ensuring reliable positioning and sustained sealing pressure. Teflon tape (170) is affixed to the L-flanges (136, 140) to reduce frictional wear on the seal during rotor rotation. Additionally, p-type seal members (172a, 172b) are mounted on radial members (148a, 148b, 160a, and 160b) to provide axial sealing between adjacent zones. The flange (174) of each p-type seal is fixed to a metal strip member (178), which is fastened to its corresponding radial member for reinforced positioning and dimensional stability.

Humid process air (102a) enters the system through the process inlet zone (144), where it passes through the rotor (118) formed with a matrix of parallel channels embedded with a desiccant material, and undergoes moisture adsorption. The resulting dry, dehumidified air (102b) exits through the process outlet zone (152) and is discharged via a process outlet duct to a controlled process area.

The regeneration process occurs by directing a preheated air stream into the regeneration inlet zone (156), wherein the preheated air (103a) takes away the moisture adsorbed by the desiccant material in the rotor (118) during the airflow through the process zones, and the humid regeneration air (103b) exits through the regeneration outlet zone (146) as exhaust air, enabling energy recovery and consistent desiccant reactivation. The rotor is driven by a motor (126) through a gear profile (122), and its rotation is aligned with the zone layout for uninterrupted operation.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. 1 illustrates a schematic view of the airflow paths within the desiccant dehumidifier of the present disclosure showing the rotor (118) and the arrangement of functionally distinct zones, including a process inlet zone (144), a process outlet zone (152), a regeneration inlet zone (156), and a regeneration outlet zone (146).
Fig. 2 illustrates an assembled view of the desiccant dehumidifier as seen from the first side wall (110), showing the process inlet zone (144) and the regeneration outlet zone (146).
Fig. 3 illustrates an assembled view of the desiccant dehumidifier as seen from the second side wall (114), showing the process outlet zone (152), and the regeneration inlet zone (156).
Fig. 4 illustrates an exploded view of the desiccant dehumidifier as seen from the first side wall (110), showing the process inlet zone (144), the regeneration outlet zone (146), and the sealing arrangements.
Fig. 5 illustrates an exploded view of the desiccant dehumidifier as seen from the second side wall (114), showing the process outlet zone (152), the regeneration inlet zone (156), and the sealing arrangements.
Fig. 6 illustrates the cross-sectional view of the desiccant dehumidifier depicting the position of the double-p-type seals (162a, 162b), and the p-type seals (172a, 172b).
Fig. 7 illustrates a magnified view of the double p-type seal (162a), the other double p-type seal (162b) is fitted in the same manner.
Fig. 8 illustrates a magnified view of one of the p-type seals (172a, 172b), the other p-type seals are fitted in the same manner.
Fig. 9 illustrates the detailed construction of one of the double-p-type seal (162a), wherein the flange (164) is secured within the corresponding circumferential lip member (112) by means of a metallic clamp (168).
FIG. 10 illustrates the detailed construction of one of the p-type seal (172a, 172b), having its flange (174) fixed on a radial member (148a), and a metal strip member (178) used to reinforce the sealing component.

LIST OF REFERENCE NUMERALS USED IN SPECIFICATION AND DRAWINGS
100 - Desiccant dehumidifier system
102a - Process air inlet flow
102b - Process air outlet flow
103a - Regeneration inlet air
103b - Regeneration outlet air
104 - Housing
110 - First side wall of housing
112 - First circumferential lip member
114 - Second side wall of housing
116 - Second circumferential lip member
118 - Rotor
122 – Rotor Gear profile
124 - Rotor Shaft
126 - Drive Motor for Rotor Gear profile
128 - First end surface of rotor
130 - Second end surface of rotor
132 - Curved surface of rotor
134 - First circumferential edge of rotor
136 - First L flange
138 - Second circumferential edge of rotor
140 - Second L flange
144 - Process inlet zone
146 - Regeneration outlet zone
148a - First radial member
148b - Second radial member
152 - Process outlet zone
156 - Regeneration inlet zone
160a - Third radial member
160b - Fourth radial member
162a - First double-p-type seal
162b - Second double-p-type seal
164 - Flange of double-p-type seal
166 - Head of double-p-type seal
168 - Metallic clamp for double-p-type seal
170 - Teflon tape for L flanges
172a - First p-type seal member
172b - Second p-type seal member
174 - Flange of p-type seal member
176 - Head of p-type seal member
178 - Metal strip member for p-type seal

DETAILED DESCRIPTION
The subject matter of the present disclosure is described in detail with reference to the accompanying drawings. Unless otherwise specified, all the technical and scientific terms used herein have the same meaning as is generally understood by a person skilled in the art pertaining to the present disclosure. Headings are used solely for organizational purposes, and are not intended to limit the disclosure in any way.

The use of the singular includes the plural unless specifically stated otherwise. As used herein, the singular forms “a,” “an” and “the” are intended to include the plural forms as well. The use of “or” means “and/or” unless stated otherwise. Unless otherwise indicated, all numbers used herein to express quantities, dimensions, and so forth used should be understood as being modified in all instances by the term "about." It is to be understood that wherein a numerical range is recited, it includes all values within that range, and all narrower ranges within that range, whether specifically recited or not. As used herein, "including," "containing" and like terms are understood to be synonymous with "comprising" and are therefore open-ended and do not exclude the presence of additional undescribed or unrecited elements, materials, phases or method steps.

In addition, it should be appreciated that any figures provided herewith are for explanation purposes to persons ordinarily skilled in the art and that the drawings of them are not necessarily drawn to scale.

Any method/process steps and/or operations and/or instructions used in this disclosure, are for illustrative purposes in a particular order and/or grouping. Other orders and/or grouping of the process steps or its portions and/or operations or its portions and/or instructions or its portions are possible and, one or more of the process steps and/or operations and/or instructions can be combined and/or deleted.

The present disclosure provides a rotary desiccant dehumidifier system configured to ensure sealing integrity between multiple airflow zones and axial faces of a rotor (118), wherein the rotor (118) is enclosed within a housing (104) between a first side wall (110) and a second side wall (114). The rotor (118) is rotatably supported about a shaft (124) and is configured to be driven via an associated gear profile (122), which is operatively engaged with a drive motor (126). The rotor (118) includes a first end surface (128), a second end surface (130), and a curved peripheral surface (132), which together define a first circumferential edge (134) and a second circumferential edge (138). Extending axially from the first end surface (128) to the second end surface (130), the rotor (118) comprises a matrix of parallel channels embedded with a desiccant material. This axial channel arrangement allows distinct airstreams from multiple zones to pass through the rotor (118) with minimal cross-mixing. The desiccant material is adapted to adsorb moisture from an incoming process air stream (102a).

Fig. 1 illustrates a schematic representation of a desiccant dehumidifier showing the rotor (118) and the arrangement of functionally distinct zones, including a process inlet zone (144), a process outlet zone (152), a regeneration inlet zone (156), and a regeneration outlet zone (146), along with the associated airflow paths.

Humid process air (102a) enters the system through the process inlet zone (144), where it passes through the rotor (118) formed with a matrix of parallel channels embedded with a desiccant material, and undergoes moisture adsorption. The resulting dry, dehumidified air (102b) exits through the process outlet zone (152) and is discharged via a process outlet duct to a controlled process area such as a cleanroom, office space, or equipment enclosure. The spatial separation between the process inlet and outlet zones (144, 152) ensures unidirectional air treatment and prevents cross-contamination.

As the rotor rotates, the desiccant material that was exposed to the process zones is brought into the regeneration zones. The regeneration process is carried out by introducing a stream of preheated regeneration air (103a) into the regeneration inlet zone (156) located on the second side wall (114) of the housing (104). As this air stream passes through the matrix of desiccant-filled channels within the rotor (118), it desorbs the moisture previously adsorbed by the desiccant material during its exposure to the humid process air (102a) in the process zones. The resulting humid regeneration air (103b) exits the system through the regeneration outlet zone (146), which is positioned on the first side wall (110), thereby facilitating both energy recovery and effective reactivation of the desiccant. The rotor (118) is rotatably driven by a motor (126) via an external gear profile (122) and is synchronized with the defined angular layout of the airflow zones to ensure continuous and uninterrupted operation.

Fig. 2, and Fig. 3 illustrate assembled views of the desiccant dehumidifier depicting the different zones with inlet process air (102a), outlet process air (102b), regeneration inlet air (103a), and regeneration outlet air (103b).
144 - Process inlet zone
146 - Regeneration outlet zone
152 - Process outlet zone
156 - Regeneration inlet zone

Fig. 4 illustrates an exploded view of the desiccant dehumidifier as seen from the first side wall (110), showing the process inlet zone (144), the regeneration outlet zone (146), and the sealing arrangements.

Fig. 5 illustrates an exploded view of the desiccant dehumidifier as seen from the second side wall (114), showing the process outlet zone (152), the regeneration inlet zone (156), and the sealing arrangements.

As shown in Fig. 4 and Fig. 5, the process inlet zone (144) and the regeneration outlet zone (146) are formed between the first side wall (110) and the first end surface (128) of the rotor (118), defined between a first radial member (148a) and a second radial member (148b). The process inlet zone (144) extends in a first circumferential direction, while the regeneration outlet zone (146) extends in the opposite direction.

On the second side wall (114), a process outlet zone (152), and a regeneration inlet zone (156) are defined between the second side wall (114), and the second end surface (130) of the rotor (118), defined between a third radial member (160a) and a fourth radial member (160b). The process outlet zone (152) extends in a first circumferential direction, while the regeneration inlet zone (156) extends in the opposite direction.

To maintain isolation between adjacent zones and prevent leakage across the axial ends of the rotor, the invention incorporates specially designed sealing elements. These include p-type seals (172a, 172b) that are fixed to the radial members (148a, 148b, 160a, and 160b) on the side walls (110, 114), preventing inter-zonal air leakage ensuring that the zones formed between them remain airtight. These seals prevent inter-zonal air leakage by forming continuous sealing lines along the radial edges where different airflow zones meet. The p-type seals comprise flanges (174) that are reinforced by metal strip members (178) (shown in Fig. 10). The double-p-type seal members (162a, 162b) are positioned within the circumferential lip members (112, 116) that are formed along the inner edges of the first and second side walls (110, 114) and are pressed against L-shaped flanges (136, 140) located on the circumferential edges (134, 138) of the rotor (118), ensuring axial sealing to prevent axial air leakage. Each seal includes a flange portion (164) that is clamped in place using metallic clamps (168) (shown in Fig. 9) to ensure secure retention during operation. A layer of Teflon tape (170) (shown in Fig. 9) is applied over the L-flanges (136, 140) to protect the double-p-type seals from wear or erosion caused by continuous friction with the rotating rotor. The double-p-type seals are positioned to seal between major zone boundaries, while p-type seals handle smaller segments and edge contacts.

The double-p-type seals (162a, 162b) are mounted within circumferential lip members (112, 116) formed along the inner periphery of the first side wall (110) and second side wall (114), respectively. Each circumferential lip member (112, 116) defines a recessed groove that securely receives the flange (164) of the double-p-type seals (162a, 162b). During assembly, the flange is seated in the groove and clamped into position using metallic clamps (168), ensuring radial and axial stability. The dual lobed sealing head of the double-p-type seals extends axially from the lip and maintains sliding contact with the adjacent rotor surface. The dual-lobed geometry of the seal enables redundant sealing lines that help maintain airtight boundaries even under pressure variations, rotor eccentricity, or thermal expansion.

In an aspect of the disclosure, the p-type seals (172a, 172b) and the double-p-type seals (162a, 162b) are made of a flexible material selected from silicone rubber, EPDM, neoprene, silicone-PTFE composite, fluorocarbon-based fluoro-elastomers such as FKM- Fluorine Kautschuk Material or FPM- Fluor-Polymer-Material (e.g. VitonTM) or other elastomeric compounds suitable for maintaining compression sealing under thermal and mechanical cycling.

In an aspect of the disclosure, the desiccant material used in the rotor (118) is selected from silica gel, molecular sieve, activated alumina, or a composite hygroscopic medium.

In an aspect of the disclosure, the radial members (148a, 148b, 160a, and 160b) are made of metal, polymer, or composite material having dimensional stability under thermal cycling e.g. stainless steel, mild steel, anodized aluminium, or engineering polymer.

In an aspect of the disclosure, the rotor (118) is formed from a lightweight thermally stable material such as aluminium alloy, reinforced polymer, or composite laminate.

In an aspect of the disclosure, the Teflon tape (170) may be replaced by other low-friction, wear-resistant films such as Fluorinated Ethylene Propylene (FEP), or UHMW polyethylene.

In an aspect of the disclosure, the p-type and double-p-type sealing members are assembled as replaceable cartridges or modular inserts, enabling seal replacement without disassembling the rotor or housing.

In an aspect of the disclosure, the rotor (118) is driven by a variable-speed motor (126) to optimize rotation based on humidity levels or zone-specific control requirements.

In an aspect of the disclosure, a gas other than atmospheric air may be used for the process, or regeneration streams, including but not limited to nitrogen, carbon dioxide, or other inert gases, depending on intended application requirements in some industrial processes or research settings.

Fig. 6 illustrates a cross-sectional view of the desiccant dehumidifier system (100) taken along a vertical midline connecting the first side wall (110) and the second side wall (114) of the housing (104). This section passes through the axis of the rotor (118) and shows the placement of the rotor (118) between the first end surface (128) and second end surface (130), along with its circumferential edges (134, 138). The figure also indicates the locations where the sealing assemblies are provided at both axial and circumferential boundaries of the rotor.

Fig. 7 shows a detailed view of the double-p-type seal member (162a) near the first circumferential edge (134) of the rotor (118). The seal exhibits a dual-lobed profile configured to seal against the rotor edge. The flange (164) of the seal is received in a circumferential lip member (112) formed along the first side wall (110) and is in contact with a L-flange (136) mounted on the rotor. This setup forms an axial seal to block leakage along the rotor’s circumference. A similar configuration is implemented on the opposite side using the second double-p-type seal (162b).

Fig. 8 illustrates a zoomed-in cross-sectional view of a p-type seal assembly (172a) positioned between the first side wall (110) and the first end surface (128) of the rotor (118). The seal (172a) includes a sealing head in contact with the rotor surface and is supported by a flange (174), which is fixed to a radial member (148a). This configuration prevents inter-zonal leakage between adjacent airflow zones on the rotor’s end face. Similar arrangements apply to the other p-type seals (172b) on the second end surface (130).

Fig. 9 illustrates the detailed construction of a double-p-type seal member (162a) positioned along the first circumferential edge (134) of the rotor (118). The seal (162a) has a dual-lobed profile/sealing head (166) configured to maintain axial sealing contact with the rotor during rotation. A flange (164) extending from the base of the seal is received within a circumferential lip member (112) provided on the inner face of the first side wall (110). The flange (164) is clamped and compressed in place using a metallic clamp (168), securing the seal and maintaining its functional position under operational conditions. The sealing interface cooperates with an L-shaped flange (136) located on the rotor to prevent axial air leakage. A similar seal assembly is used for the opposite side of the rotor, involving the second double-p-type seal (162b) and associated hardware.

Fig. 10 illustrates the structure of a p-type seal member (172a) fixed to the radial member (148a) for providing radial sealing contact between adjacent zones on the first end surface (128) of the rotor (118). The p-type seal includes a sealing head portion (176) that interfaces with the rotor surface and is supported by a flange (174), which is mechanically fastened to a metal strip member (178). The metal strip member (178) reinforces the seal and enables reliable attachment to the radial member (148a), ensuring positional integrity and long-term performance. A similar configuration is used for the remaining p-type seals attached to radial members (148b, 160a, and 160b) along the rotor’s axial faces.

Examples:
The present disclosure will now be explained in further detail by the following examples. These examples are illustrative of certain embodiments of the disclosure without limiting the scope of the present disclosure.

A desiccant dehumidifier system constructed in accordance with the present disclosure was fabricated and tested under controlled conditions. The key specifications, materials, and component dimensions are as follows:
 Housing dimensions: approximately 620 mm (length) × 1200 mm (width) × 1350 mm (height)
 Housing body material: Mild steel (MS)
 Rotor diameter: approximately 1050 mm
 Rotor construction: Mild steel frame with silica gel-impregnated honeycomb matrix
 Rotor speed: 6 to 10 RPH, driven by a variable-speed motor (126) through a gear profile (122)
 Circumferential lip member dimensions (112, 116): diameter approx. 1084 mm, depth approx. 45 mm
 Double-p-type seal member dual lobed cross-sectional dimensions (162a, 162b): dual-lobed cross-section approx. 20 mm diameter, with flange (164) width approx. 45 mm
 p-type seal member dimensions (172a, 172b): single lobe diameter approx. 15 mm diameter, flange (174) width approx. 85 mm
 Material of p-type seal members: High temperature silicone rubber with GI (galvanised iron) strip (178) reinforcement (width of GI strip is 25 mm)
 Material of double-p-type seal members: High temperature Silicone rubber, secured using stainless steel clamps (168)
 Teflon tape (170): width approx. 45 mm, thickness approx. 0.5 mm, applied to L-flanges (136, 140) on the rotor’s circumferential edges (134, 138)
 Radial member material: Mild steel (MS)
 Location of trial: Hyderabad, India
 Airflow type: Humid air, i.e. One Trial done in Summer (Month of May) (53% RH), and Two Trials done in Monsoon (one in the month of July, 81% RH, and another in August, 89% RH)
 Test environment: Closed equipment enclosure with limited passive ventilation
 Process air velocity: 1.0 to 3.0 m/s
 Regeneration air temperature: 80 to 140 °C supplied to regeneration inlet zone
 Humidity control outcome: The process outlet air exhibited an approximate 85% to 95% reduction in absolute humidity compared to the process inlet, confirming effective adsorption and minimal air leakage.

These trials conducted as in the example at different humid environments of the year (Months of May, July and August) demonstrates the cooperative effect of zonal sealing, axial sealing, regeneration, and friction-reducing materials in delivering a durable, energy-efficient, and high-performance dehumidification system.

Advantages:
The desiccant dehumidifier system of the present disclosure has the following non-limiting advantages.
 Enhanced Sealing Performance: The use of double-p-type and p-type seal members significantly reduces axial and inter-zonal air leakage, ensuring precise airflow routing through designated zones.
 Reduced Seal Wear and Extended Lifespan: Teflon tape applied to the rotor-mounted L-flanges reduces frictional wear on the double-p-type seals during rotation, thereby extending seal life and reducing maintenance frequency.
 Compact and Reliable Construction: Radial members mounted directly on side walls provide a stable frame for seal placement and rotor zoning, improving structural integrity and operational reliability.
 Consistent Moisture Removal: Continuous rotor rotation through defined process and regeneration zones ensures uninterrupted dehumidification performance.
 Modular, Maintainable Design: The sealing assemblies, including clamps and mounting hardware, are designed for tool-accessible replacement without removing the rotor or disassembling the entire housing.
 Flexible for Diverse Applications: The system supports the use of alternate gases (e.g., nitrogen or CO₂) in place of air, allowing deployment in sensitive or inert environments such as cleanrooms or pharmaceutical enclosures.
 The rotor is driven by a variable-speed motor to optimize rotation based on humidity levels or zone-specific control requirements.

Applications:
The desiccant dehumidifier system of the present disclosure has the following non-limiting industrial applications.
 Cleanrooms and Controlled Environments such as for semiconductor manufacturing, pharmaceutical production, and biotechnology labs where stringent humidity control and particle isolation are essential.
 Battery and EV Component Manufacturing: For production of lithium-ion batteries and dry rooms, where ultra-low humidity levels are required to prevent material degradation and ensure process integrity.
 Pharmaceutical and Medical Storage, especially for hygroscopic drugs and medical devices sensitive to moisture.
 Precision Electronics and Optics Manufacturing, where moisture and condensation can damage sensitive circuits, optics, or coatings.
 Aerospace and Defence Enclosures that require dry, sealed airflow management.
 Food Processing and Packaging
 Museum and Archive Preservation
 HVAC Systems for Critical Infrastructure requiring dry air distribution with minimal leakage.
 Chemical Processing Plants where controlled humidity is needed for drying processes, reaction stability, or product quality control.
 Military and Strategic Installations that require humidity-controlled environments.

Although the present disclosure is described in terms of one or more embodiments, it is to be understood that they have been presented by way of example, and are not limiting. Thus, the present disclosure should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
, Claims:
1. A desiccant dehumidifier system (100) comprising:
 a rotor (118) enclosed within a first side wall (110) and a second side wall (114) of a housing (104), the rotor (118) being rotatable about a shaft (124) and configured to be driven by a gear profile (122), the rotor (118) having a first end surface (128), a second end surface (130), and a curved surface (132) defining a first circumferential edge (134) and a second circumferential edge (138), wherein the rotor (118) comprises a matrix of parallel channels embedded with a desiccant material disposed axially from the first end surface (128) to the second end surface (130) to permit passage of distinct airstreams through the rotor (118) without substantial cross-mixing, the desiccant material being configured to adsorb moisture from an inflow of process air (102a);
 a process inlet zone (144) and a regeneration outlet zone (146) formed between the first side wall (110) and the first end surface (128) of the rotor (118), the process inlet zone (144) and the regeneration outlet zone (146) being angularly defined between a first radial member (148a) and a second radial member (148b), the process inlet zone (144) extending in a first circumferential direction and the regeneration outlet zone (146) extending in an opposite circumferential direction;
 a process outlet zone (152), and a regeneration inlet zone (156) formed between the second side wall (114) and the second end surface (130) of the rotor (118), the process outlet zone (152) and the regeneration inlet zone (156) being angularly defined between a third radial member (160a) and a fourth radial member (160b), the process outlet zone (152) extending in a first circumferential direction and the regeneration inlet zone (156) extending in an opposite circumferential direction;
 wherein the radial members (148a, 148b, 160a, and 160b) are mounted on the respective side walls (110, 114);
 wherein the process inlet zone (144) is configured to receive process air (102a) and direct it through the rotor (118), such that the desiccant material adsorbs moisture from the process air (102a) as it passes through the rotor (118) to produce dehumidified process outlet air (102b) at the process outlet zone (152), while a stream of preheated regeneration air (103a) entering through the regeneration inlet zone (156) desorbs moisture from the desiccant material and exits as humid regeneration air (103b) through the regeneration outlet zone (146),
characterised in that:
 a first double-p-type seal member (162a) disposed within a first circumferential lip member (112), the first double-p-type seal member (162a) being in sealing contact with the first circumferential edge (134) of the rotor (118) to prevent air leakage from the process inlet zone (144) and the regeneration outlet zone (146);
 a second double-p-type seal member (162b) disposed within a second circumferential lip member (116), the second double-p-type seal member (162b) being in sealing contact with the second circumferential edge (138) of the rotor (118) to prevent air leakage from the process outlet zone (152), and the regeneration inlet zone (156);
 a set of first p-type seal members (172a) fixed respectively to the first radial member (148a) and the second radial member (148b), each being in sealing contact with the first end surface (128) of the rotor (118) to prevent leakage between the process inlet zone (144) and the regeneration outlet zone (146); and
 a set of second p-type seal members (172b) fixed respectively to the third radial member (160a), fourth radial member (160b), each being in sealing contact with the second end surface (130) of the rotor (118) to prevent leakage between the process outlet zone (152), and the regeneration inlet zone (156).

2. The desiccant dehumidifier system (100) as claimed in claim 1, wherein a flange (164) of each double-p-type seal member (162a, 162b) is clamped and compressed within the respective circumferential lip member (112, 116) by a metallic clamp (168), to securely retain the seal and maintain sealing contact with the corresponding circumferential edge (134, 138) of the rotor (118) during operation.

3. The desiccant dehumidifier system (100) as claimed in claim 1, wherein a flange (174) of each p-type seal member (172a, 172b) is mechanically fastened to a metal strip member (178), the strip being secured to a corresponding radial member (148a, 148b, 160a, and 160b) to reinforce the seal and maintain sealing contact with the respective end surface (128, 130) of the rotor (118) during operation.

4. The desiccant dehumidifier system (100) as claimed in any of the preceding claims, wherein the desiccant material embedded within the rotor (118) comprises at least one of silica gel, molecular sieve, activated alumina, or a composite hygroscopic medium configured for moisture adsorption from process air (102a).

5. The desiccant dehumidifier system (100) as claimed in claim 1, wherein the p-type seal members (172a, 172b) and the double-p-type seal members (162a, 162b) are made from a flexible material selected from silicone rubber, EPDM, neoprene, a silicone-PTFE composite, or a fluorocarbon-based fluoro-elastomer.

6. The desiccant dehumidifier system (100) as claimed in claim 1, wherein a gas other than air is employed for at least one of the process or regeneration airstreams, the gas being selected from nitrogen, carbon dioxide, or inert gases based on application-specific requirements.

7. The desiccant dehumidifier system (100) as claimed in claim 1, wherein the radial members (148a, 148b, 160a, and 160b) are made of a structurally rigid material selected from stainless steel, mild steel, anodized aluminium, or engineering polymer.

8. The desiccant dehumidifier system (100) as claimed in claim 1, wherein a Teflon tape (170) or another low-friction, wear-resistant film is applied to the L-flanges (136, 140) formed on the rotor’s circumferential edges (134, 138) to minimize erosion of the double-p-type seal members (162a, 162b) caused by continuous contact during rotor operation.

9. The desiccant dehumidifier system (100) as claimed in claim 1, wherein the sealing assemblies are configured as modular inserts or cartridges to allow for replacement without removal of the rotor (118) or disassembly of the housing (104).

10. The desiccant dehumidifier system (100) as claimed in claim 1, wherein the rotor (118) is driven by a variable-speed motor (126) to optimize rotation based on humidity levels or zone-specific control requirements.