Adjustable inlet header for heat exchanger of an HVAC system
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Solution Overview
Problem
Traditional HVAC heat exchanger configurations often result in heterogeneous two-phase flow, leading to inefficiencies in refrigerant distribution and heat transfer, which can be improved by enhancing the homogeneity of refrigerant flow and equalizing its distribution across tubes.
Innovation Solution
A customizable inlet header with interchangeable refrigerant distributor segments featuring different orifice shapes and sizes, which can be adjusted based on operating conditions to optimize refrigerant distribution to the tubes, improving flow homogeneity and distribution efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional HVAC heat exchanger configurations are used, then the structure is simple and easy to manufacture, but the refrigerant flow becomes heterogeneous and distribution is unequal
Solution Approach 1:
The inlet header is divided into multiple interchangeable distributor segments, each with different orifice configurations. This segmentation allows the system to switch between different distribution patterns based on operating conditions, improving refrigerant uniformity without permanently complicating the base structure.
Solution Approach 2:
The system transitions from a static, fixed orifice configuration to a dynamic system where distributor segments can be interchanged based on operating conditions. This dynamic adaptability allows optimization of refrigerant distribution for different load conditions while maintaining structural simplicity through modular design.
2Productivity
If fixed orifice configuration is used, then the device is simple to operate, but the heat exchanger efficiency decreases under varying operating conditions
Solution Approach 1:
The system changes the physical parameters of the orifices (size, shape, distribution pattern) by interchange, the distributor segments to adapt to different operating conditions. This allows optimization of refrigerant flow characteristics for maximum heat exchanger efficiency across varying loads.
Solution Approach 2:
The inlet header is designed as a universal platform that can accommodate multiple types of distributor segments. Each segment serves a specific function for different operating conditions, making the overall system multi-functional and adaptable without requiring separate heat exchanger designs.
3Reliability
If interchangeable distributor segments are implemented, then refrigerant distribution is improved, but the device complexity and potential reliability issues increase
Solution Approach 1:
By segmenting the distributor into interchangeable modules, the system isolates complexity into discrete, manageable units. Each segment can be independently designed, tested, and maintained, reducing overall system risk while improving performance consistency through optimized refrigerant distribution.
Solution Approach 2:
The design allows for easy replacement of distributor segments when performance degrades or operating conditions change permanently. Worn or ineffective segments can be discarded and replaced with new or different configurations, extending system life and maintaining reliability without complex repair procedures.
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 adjustable orifice design enhances the homogeneity of two-phase refrigerant flow and ensures equal distribution across the heat exchanger tubes, thereby improving the overall efficiency of the HVAC system.
Implementation Method 1
first orifices configured to fluidly couple with the tubes to facilitate distribution of refrigerant from the inlet header to the tubes
Implementation Method 2
tubes for flowing refrigerant between headers that are connected to a refrigerant inlet and outlet. As refrigerant flows through the tubes, the refrigerant may exchange heat with air flowing over or between the tubes
Implementation Method 3
air flowing over or between the tubes. The air may then be distributed to a commercial or residential space requiring temperature-controlled air
Implementation Method 4
the refrigerant undergoes a phase change while flowing through (or to) the heat exchangers in which evaporation or condensation occur
Implementation Method 5
the refrigerant undergoes a phase change while flowing through (or to) the heat exchangers in which evaporation or condensation occur
Implementation Method 6
other of the energy is exchanged by phase changes (i.e., latent heat)
Data Source
AI summary
A heat exchanger of an HVAC system including an inlet header, an outlet header, and tubes configured to extend between the inlet header and the outlet header. The system also includes a first interchangeable refrigerant distributor segment of the inlet header, where the first interchangeable refrigerant distributor segment includes first orifices configured to fluidly couple with the tubes to facilitate distribution of refrigerant from the inlet header to the tubes in a first configuration. The system also includes a second interchangeable refrigerant distributor segment of the inlet header, where the second interchangeable refrigerant distributor segment includes second orifices configured to fluidly couple with the tubes to facilitate distribution of refrigerant from the inlet header to the tubes in a second configuration. The first orifices include a first characteristic of an orifice cross-sectional internal boundary size or shape, and the second orifices include a second characteristic of the orifice cross-sectional internal boundary size or shape different than the first characteristic.