Variable Inlet Grill for Transport Refrigeration
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Solution Overview
Problem
Conventional transport refrigeration unit grills lack the ability to dynamically adjust airflow based on cooling demand, leading to suboptimal performance and increased noise during varying operational conditions.
Innovation Solution
A grill assembly with rotatable louver members that can be moved between open and closed positions to vary the inlet area, utilizing an actuation mechanism controlled by a system to maximize airflow when needed and minimize it when not, thereby optimizing cooling performance and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the grill uses a fixed inlet area design, then the structure is simple and manufacturing is easy, but the cooling performance cannot be optimized under varying operational conditions
Solution Approach 1:
The patent applies the dynamics principle by making the grill inlet area variable through rotatable louver members that can adjust between open and closed positions. This allows the inlet area to dynamically change based on cooling demand, resolving the contradiction between adaptability and structural simplicity by introducing controlled mobility to key components.
Solution Approach 2:
The grill is segmented into multiple independent louver members that can rotate individually or in groups. This segmentation allows partial adjustment of the inlet area rather than requiring complete opening or closing, enabling fine-tuned optimization of cooling performance while maintaining a relatively simple overall structure.
2Temperature
If the inlet area is maximized for optimal cooling, then cooling efficiency improves, but noise increases during low-demand operations
Solution Approach 1:
The dynamic adjustment capability of the louver members allows the system to optimize the inlet area based on real-time cooling demand. During low-demand operations, the louvers close partially to reduce inlet area, which decreases airflow velocity and thereby reduces noise generation, while maintaining sufficient cooling capacity when needed.
Solution Approach 2:
The system changes the geometric parameter of the inlet area by rotating the louver members to different angles. This parameter adjustment enables the grill to adapt the inlet area size to match cooling demand, thereby optimizing cooling efficiency when high and reducing noise when low demand exists.
3Productivity
If the louver members are made rotatable for dynamic adjustment, then airflow can be optimized, but the manufacturing complexity and cost increase
Solution Approach 1:
By segmenting the grill into multiple identical louver members, the manufacturing process can use standardized components that are mass-produced using the same tooling and processes. This segmentation approach maintains ease of manufacture while enabling dynamic airflow optimization through the rotational capability of each standardized louver unit.
4Object-generated harmful factors
If the grill inlet area is reduced, then noise is minimized, but cooling performance deteriorates
Solution Approach 1:
The dynamic nature of the louver adjustment mechanism allows the system to reversibly change the inlet area based on operational conditions. When cooling performance is needed, the louvers open to maximize the inlet area; when noise reduction is prioritized, the louvers close. This dynamic reversibility resolves the contradiction by allowing the system to adapt to different operational priorities.
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
The solution allows for adaptive airflow management, enhancing cooling efficiency and reducing noise by adjusting the grill's inlet area in response to cooling demands, thus improving the overall performance of the transport refrigeration unit.
Implementation Method 1
each of the plurality of louver members is rotatable about a respective axis between a first position and a second position
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A cover assembly 40 of a transport refrigeration unit 34 includes a surround assembly 64 having a central opening 66 and a grill 62 positionable in overlapping relationship with the central opening 66. The grill 62 includes a plurality of louver members 72 and a plurality of openings is defined between the plurality of louver members 72. The plurality of openings is arranged in fluid communication with the central opening 66. The plurality of openings define a variable inlet area.