Stacked Condenser Coil Layout for High-Ambient HVAC Cooling
Find Innovative SolutionsGenerate Solutions
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, where air flow is configured in a series arrangement to optimize heat transfer and reduce condensing temperatures, incorporating microchannel or multichannel coils and round-tube plate-fin configurations to enhance efficiency and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional single-section air-cooled condenser is used, then the system is simpler in design, but the condensing temperature increases at high ambient air temperatures, reducing system performance and efficiency
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. Each section handles a portion of the refrigerant flow independently, allowing the system to maintain lower average condensing temperatures even at high ambient air temperatures, thereby improving system performance without excessive complexity
Solution Approach 2:
The patent transitions from a single-plane condenser design to a multi-level stacked configuration arranged vertically. This three-dimensional arrangement allows multiple coil sections to be positioned at different heights and orientations, enabling series air flow patterns and differential temperature operation while maintaining a compact footprint
2Productivity
If stacked coil sections operating at different condensing temperatures are implemented, then system capacity increases at high ambient temperatures, but the device complexity increases
Solution Approach 1:
The refrigerant flow is segmented into multiple streams that pass through different coil sections at different temperatures and pressures. This segmentation allows each section to operate optimally at its designated temperature level, maintaining high system capacity at elevated ambient temperatures while using standardized modular coil components to limit complexity
Solution Approach 2:
Multiple coil sections operating at different condensing temperatures are merged into a single integrated heat exchanger assembly with common air flow paths and shared structural support. This combining approach achieves enhanced system capacity through differential temperature operation while avoiding the complexity of completely separate heat exchanger units
3Temperature
If series air flow configuration is used through stacked sections, then heat transfer efficiency improves and condensing temperature reduces, but air flow resistance increases
Solution Approach 1:
Different air flow characteristics are applied to different sections of the heat exchanger. The series air flow configuration allows air to progress through sections at different temperatures, with each section optimized for its local thermal conditions. This local optimization improves heat transfer efficiency while the gradual temperature progression helps manage air flow resistance
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 achieves a more compact system, increased capacity at high ambient temperatures, balanced compressor motor loads, reduced fan noise, and improved efficiency by closely correlating ambient air temperature with condensing temperature, while using fewer fans and lowering costs.
Implementation Method 1
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 2
circulating air generated by an air moving device such as a fan or blower
Implementation Method 3
The at least one first section is positioned next to and substantially parallel to the at least one second section and the at least one first section and the at least one second section are positioned to have the air exiting the at least one first section entering the at least one second section
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
Implementation Method 5
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.