Inlet Air Flow Guide Plenum for Confined ACDX Condensing Units
Find Innovative SolutionsGenerate Solutions
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 together, leading to increased intake air temperatures and prolonged operation cycles, which can result in reduced performance and higher energy consumption.
Innovation Solution
The implementation of a flow router, specifically an inlet air flow guide, which creates a plenum to direct and accelerate cooler air to the cooling coil, preventing hot exhaust air recirculation and ensuring adequate cooling air flow, even in restricted installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ACDX units are installed in confined spaces or close together, then installation flexibility is improved, but cooling air flow is restricted and intake air temperature increases
Solution Approach 1:
The inlet air flow guide extends the air intake path from a single-plane approach to a three-dimensional plenum structure that draws air from multiple directions and depths, effectively creating additional air intake pathways that bypass the restrictions of confined installation spaces
Solution Approach 2:
The inlet air flow guide acts as an intermediary structure between the restricted external environment and the cooling coil, creating a dedicated air supply channel that isolates the cooling process from the adverse effects of confined installation spacing
2Adaptability or versatility
If ACDX units are installed in confined spaces, then installation flexibility is improved, but cooling air velocity decreases
Solution Approach 1:
The plenum structure transforms the air flow from a two-dimensional surface approach to a three-dimensional volume flow, increasing the cross-sectional area and velocity of air reaching the cooling coil by utilizing spatial depth in addition to horizontal and vertical dimensions
Solution Approach 2:
The inlet air flow guide pre-accelerates and pre-directs air into the plenum chamber before it reaches the cooling coil, ensuring that air enters the coil at optimal velocity and direction, thereby compensating for the velocity losses that would otherwise occur in confined installation environments
3Adaptability or versatility
If cooling air flow is restricted, then installation flexibility is improved, but heat dissipation efficiency decreases
Solution Approach 1:
The inlet air flow guide serves as an intermediary that decouples the heat dissipation process from installation spacing constraints, providing a dedicated air supply pathway that ensures adequate cooling air flow regardless of the unit's proximity to other structures or units
Solution Approach 2:
By creating a three-dimensional plenum structure, the invention expands the air intake capacity beyond the limited two-dimensional space available in confined installations, thereby maintaining sufficient air flow volume for effective heat dissipation even when horizontal spacing is restricted
4Adaptability or versatility
If unit spacing is reduced, then installation flexibility is improved, but hot exhaust air recirculation increases
Solution Approach 1:
The inlet air flow guide acts as a protective intermediary that shields the air intake from hot exhaust air plumes, creating a dedicated cool air supply pathway that prevents thermal contamination from adjacent units or building surfaces
Solution Approach 2:
The inlet air flow guide proactively prevents hot exhaust air recirculation by establishing a preferential air flow path that draws cool air from areas upstream of the exhaust plume, thereby preemptively blocking the mechanism of thermal contamination before it can occur
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 enhances the efficiency of ACDX units by reducing energy consumption, lowering the cumulative daily run-time of the condenser unit, and providing real monthly savings through improved cooling air velocity and temperature, while also reducing fan workload and energy demand.
Implementation Method 1
an inlet air flow guide defining a plenum to provide an air flow passage to the opening from one side thereof
Implementation Method 2
the inlet air flow guide directs and accelerate cooler air to the cooling coil
Implementation Method 3
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 4
air is drawn by the CU fan 114 to dissipate the heat collected in the refrigerant during the cooling cycle
Implementation Method 5
an exhaust fan to draw air through the opening across the coil and discharge the air above the housing
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.