Inlet Air Flow Guide Plenum for Confined ACDX Condensers
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Solution Overview
Problem
Air-cooled direct expansion (ACDX) HVAC units face efficiency issues due to restricted cooling air flow, especially when installed in confined spaces or close proximity to each other, leading to increased intake air temperatures and prolonged operation cycles, which can result in reduced performance and increased energy consumption.
Innovation Solution
The implementation of an inlet air flow guide that creates a plenum to direct cooler air across the cooling coil, preventing hot exhaust air recirculation and improving air flow velocity and temperature, thereby enhancing the efficiency of the condensing unit without requiring a power source and allowing for easy installation as a retrofit or in original equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the condensing unit is installed in confined spaces or close proximity to each other, then the installation flexibility is improved, but the cooling air flow is restricted and intake air temperature increases
Solution Approach 1:
The inlet air flow guide extends the air intake path into a third dimension by creating a plenum chamber that draws air from multiple directions and depths, not just the immediate front surface. This dimensional approach allows the unit to access cooler air from areas that would otherwise be unavailable in confined installations.
Solution Approach 2:
The plenum chamber acts as an intermediary space between the external environment and the cooling coil. It collects and conditions air before delivery, serving as a buffer that decouples the unit's performance from immediate installation constraints and hot exhaust recirculation.
2Adaptability or versatility
If the condensing unit operates in restricted air flow conditions, then the unit can be installed in more locations, but the operation cycle time increases and efficiency decreases
Solution Approach 1:
The plenum chamber performs preliminary air collection and cooling before the air reaches the cooling coil. By pre-conditioning the air in advance, the system reduces the workload during actual operation, enabling faster cooling cycles even in restricted air flow conditions.
3Volume of stationary object
If the exhaust air recirculates back to the intake, then the installation space requirements are reduced, but the intake air temperature increases and cooling efficiency decreases
Solution Approach 1:
The inlet air flow guide segments the air intake into distinct zones within the plenum chamber, creating separate flow paths that prevent hot exhaust air from mixing with the cooler intake air. This segmentation maintains temperature separation while operating in confined spaces.
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 solution reduces the cumulative daily run-time of the condenser unit, decreases energy consumption, and provides monthly savings by ensuring cooler air is directed across the refrigerant coils, reducing the power demand and extending the lifespan of HVAC components.
Implementation Method 1
an inlet air flow guide that creates a plenum to direct cooler air across the cooling coil, preventing hot exhaust air recirculation and improving air flow velocity and temperature
Implementation Method 2
cold refrigerant is supplied to the evaporator coil 104, and the AHU fan 102 blows air across the evaporator coil 104, cooling the air that is circulated into the rooms
Implementation Method 3
The cooling coil 116 is typically provided with extended surfaces such as fins, over which air is drawn by the CU fan 114 to dissipate the heat collected in the refrigerant during the cooling cycle
Data Source
AI summary
An inlet air flow guide for a condensing unit of an air cooled direct expansion (ACDX) air conditioning unit. The flow guide has a panel having at least a portion spaced from a surface of the condensing unit to define a plenum for cooling air to enter the condensing unit from one side. A condensing unit of an ACDX air conditioning unit has a refrigerant cooling coil disposed in an opening, and the inlet air flow guide defines a plenum to provide an air flow passage to the opening from one side thereof. According to a method, the inlet air flow guide is installed onto the condensing unit of an ACDX air conditioning unit, wherein a panel of the flow guide has at least a portion spaced from a surface of the condensing unit to define a plenum for cooling air to enter the condensing unit from one side.