Stacked Condenser Coil Sections for High-Ambient HVAC Capacity
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Solution Overview
Problem
Air-cooled condensers in HVAC&R systems face performance and efficiency decreases at high ambient air temperatures due to increased condensing temperatures and pressures, necessitating a solution to maintain system performance and efficiency.
Innovation Solution
A heat exchanger design with stacked coil sections operating at different condensing temperatures and pressures, utilizing separate refrigerant circuits and air flow in a series configuration to reduce average condensing temperature and improve heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single condenser section is used, then the device complexity is low, but the system capacity decreases at high ambient temperatures
Solution Approach 1:
The condenser is divided into multiple stacked coil sections (first section, second section, third section) that operate at different condensing temperatures and pressures. This segmentation allows each section to handle specific temperature ranges, improving overall system capacity at high ambient temperatures while maintaining manageable structural complexity through modular design
Solution Approach 2:
The patent transitions from a single-plane condenser configuration to a stacked three-dimensional arrangement of coil sections. This vertical stacking approach utilizes the third dimension to increase heat exchange surface area and capacity without significantly increasing horizontal footprint, thereby improving productivity without proportionally increasing device complexity
2Productivity
If stacked coil sections operating at different temperatures are used, then heat exchange efficiency improves, but device complexity increases
Solution Approach 1:
Each coil section is designed with specific local characteristics optimized for its operating temperature range. The first section operates at a higher condensing temperature, the second section at an intermediate temperature, and the third section at a lower temperature. This local quality differentiation maximizes heat exchange efficiency in each zone while the modular structure keeps overall complexity manageable
Solution Approach 2:
The system incorporates dynamic operational flexibility where different coil sections can be selectively activated based on ambient temperature conditions and system load requirements. This dynamic operation allows the condenser to adapt to varying conditions, improving heat exchange efficiency without requiring permanent complex structures for all operating scenarios
3Temperature
If series air flow configuration is used, then condensing temperature reduces, but fan noise increases
Solution Approach 1:
The air flow path is segmented through multiple coil sections arranged in series, allowing the total temperature reduction to be distributed across sections rather than requiring a single high-velocity flow. This segmentation maintains lower condensing temperatures while reducing the need for high fan speeds, thereby mitigating fan noise
Solution Approach 2:
The patent uses vertical stacking of coil sections to create a multi-level air flow path. Air moves through sections at different elevations in series, which allows for more gradual temperature reduction without requiring high-velocity horizontal flow. This three-dimensional arrangement reduces fan noise while achieving the desired condensing temperature reduction
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
This design enhances system capacity, reduces fan noise, and achieves more efficient use of condenser surface, leading to improved system efficiency and lower costs while maintaining performance at high ambient temperatures.
Implementation Method 1
the refrigerant flowing through the condenser can exchange heat with circulating air generated by an air moving device such as a fan or blower
Implementation Method 2
The refrigerant vapor delivered to the condenser enters into a heat exchange relationship with a fluid, e.g., air or water
Implementation Method 3
The refrigerant vapor delivered to the condenser enters into a heat exchange relationship with a fluid, e.g., air or water, and undergoes a phase change to a refrigerant liquid
Implementation Method 4
The refrigerant vapor delivered to the condenser enters into a heat exchange relationship with a fluid, e.g., air or water, and undergoes a phase change to a refrigerant liquid
Data Source
AI summary
A heat exchanger is provided with stacked coil sections. Each of the stacked coil sections is configured to circulate a fluid independent from the other coil section. An air moving device is used to circulate air through both of the stacked coil sections. The stacked coil sections are positioned to have the air exiting the one coil section entering the other coil section.