Slidable HEX Chamber Housing for Compact DOAS Maintenance Access
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Solution Overview
Problem
Compact industrial air conditioning systems face challenges in accessing heat exchanger assemblies for maintenance due to their compact design, which makes it difficult to service, repair, and maintain HEX assemblies without additional rolling elements that increase manufacturing costs.
Innovation Solution
A housing design for a dedicated outdoor air system (DOAS) that includes a HEX chamber allowing the HEX assembly to slide in and out, with a drain pan supporting the weight and condensation collection, and an insulating component facilitating sliding without additional rolling elements, ensuring easy access for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing is designed to be compact with dimensions substantially corresponding to the HEX assembly, then space utilization is improved, but access to the HEX assembly for maintenance becomes difficult
Solution Approach 1:
The housing is divided into multiple chambers (first chamber for HEX assembly, second chamber for other components) with the HEX chamber specifically designed to slidably accept the HEX assembly. This segmentation allows the HEX assembly to be accessed by sliding it out of its chamber while maintaining a compact overall housing volume.
Solution Approach 2:
The HEX assembly is designed to be movable within the housing through a sliding mechanism. The HEX chamber includes an aperture that allows the HEX assembly to slide in and out, transforming the static enclosure into a dynamic system where maintenance access is achieved through motion rather than housing disassembly.
2Ease of repair
If additional rolling elements are added to enable HEX assembly sliding, then maintenance access is improved, but manufacturing cost increases
Solution Approach 1:
The drain pan itself is designed to facilitate the sliding of the HEX assembly through its structural configuration. The drain pan includes a bottom surface with a downward slope toward the front of the housing and side surfaces that form guides, allowing the HEX assembly to slide along these surfaces without requiring separate rolling elements.
Solution Approach 2:
The drain pan is designed to serve multiple functions: (1) collecting condensation from the HEX assembly, (2) supporting the weight of the HEX assembly, and (3) providing a sliding mechanism for HEX assembly movement. This multi-functionality eliminates the need for additional rolling elements while maintaining ease of maintenance access.
3Strength
If the drain pan is designed to support the weight of the HEX assembly, then structural stability is improved, but sliding capability may be compromised
Solution Approach 1:
The drain pan is designed with specific geometric parameters including a bottom surface with a downward slope toward the front of the housing and side surfaces that form guides. These parameter changes allow the drain pan to simultaneously support the weight of the HEX assembly and provide a low-friction sliding path for maintenance access.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy access to HEX assemblies for maintenance by sliding them in and out of the housing, reducing manufacturing costs and improving serviceability while maintaining insulation and condensation management.
Implementation Method 1
The HEX assembly facilitates the transfer of heat between the air or refrigerant passing through the HEX coil and the surrounding environment
Implementation Method 2
The insulating component can be made of expanded polystyrene (EPS) or another insulating material covered with a water-resistant coating
Implementation Method 3
condensation formed on a surface of the HEX coils needs to be collected by a drain pan arranged underneath the HEX assembly
Implementation Method 4
The drain pan should include or interact with an insulating component to provide insulation for the drain pan and reduce the formation of condensation
Data Source
AI summary
A dedicated outdoor air system (DOAS) includes an outdoor air channel, an energy exchange chamber, and a HEX chamber. The energy exchange chamber receives outdoor air from the outdoor air channel and includes an air exchanger generating supply air by transferring energy between the outdoor air and return air. The HEX chamber receives the supply air from the energy exchange chamber. The HEX chamber includes a HEX assembly for cooling and/or heating the supply air provided by the energy exchange chamber. The HEX chamber is defined by a frame including a plurality of sides and an insulating component. A first side of the frame defines an aperture to slidably accept the HEX assembly into an enclosed position within the frame. The insulating component is fixedly arranged within the frame and includes a working surface configured for sliding the HEX assembly into the enclosed position.