Fresh air distribution system for packaged terminal air conditioner
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Solution Overview
Problem
Existing air conditioner systems, particularly PTACs, face challenges in efficiently distributing and combining fresh air with recirculated air while minimizing energy consumption and ensuring effective air distribution within the indoor space, as they often suffer from backpressure and inefficient air flow due to harsh outdoor conditions and internal air mixing.
Innovation Solution
A fresh air distribution system that includes a specially configured intake housing and duct assembly, featuring perpendicular bends and baffles, to redirect and distribute pressurized fresh air vertically, horizontally, and downwardly within the PTAC, combined with pretreatment processes like filtration and temperature/humidity sensing for optimized airflow and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fresh air is introduced through conventional duct systems, then air distribution is achieved, but backpressure increases and energy consumption rises
Solution Approach 1:
The duct system is divided into multiple sections with perpendicular bends arranged in sequence (vertical lift, horizontal redirection, lateral spread, downward redirection). This segmentation allows the pressurized fresh air to be distributed in stages, reducing overall backpressure while maintaining effective delivery to the mixing plenum.
Solution Approach 2:
The system introduces fresh air through a multi-dimensional path with vertical, horizontal, and lateral components rather than a simple linear duct. This dimensional approach optimizes pressure distribution and reduces energy consumption by utilizing spatial arrangement to manage airflow dynamics.
2Ease of operation
If fresh air is distributed directly without redirection, then energy demand is reduced, but air distribution uniformity deteriorates
Solution Approach 1:
The perpendicular bend configuration segments the airflow into distinct directional changes (vertical, horizontal, lateral, downward). This segmentation ensures uniform distribution of fresh air across the mixing plenum while minimizing the total energy demand through optimized bend geometry and arrangement.
3Reliability
If metallic ducts are used throughout, then durability is improved, but weight and frictional resistance increase
Solution Approach 1:
The duct system applies different materials in different locations based on functional requirements. Metallic ducts are used in sections requiring durability (such as outdoor or high-stress areas), while plastic material is used in sections where weight and frictional resistance are critical. This local differentiation optimizes the overall system performance.
4Productivity
If inlet port area is reduced, then device complexity is lowered, but air flow impedance increases
Solution Approach 1:
The intake housing is pre-configured with an optimally sized inlet port that prevents backpressure before air enters the blower apparatus. This preliminary design consideration ensures maximum airflow efficiency without requiring complex downstream modifications, thereby maintaining productivity while controlling device complexity.
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 system enhances air distribution by reducing pressure drop and energy demand, ensuring even air distribution and heat recovery, while improving the combination of fresh and recirculated air within the PTAC, thus addressing inefficiencies in existing systems.
Implementation Method 1
a blower apparatus receives fresh air from the outdoor environment, pressurizes the fresh air and then discharges the air into the subject fresh air distribution system
Implementation Method 2
The stream of pressurized fresh air is desirably redirected through at least two perpendicular bends before being combined with inside air
Implementation Method 3
configured of plastic material that is moldable, lighter in weight than metal and has low frictional resistance to air flow
Implementation Method 4
comprises a plurality of baffles to help provide even air distribution across the width of the inside plenum of the PTAC
Data Source
AI summary
A fresh air distribution system designed for PTAC use, the system comprising a first upwardly directed air distribution duct configured to receive a stream of pressurized fresh air discharged from a fresh air blower apparatus and to redirect the stream into a transversely extending second air distribution duct communicating with the first air distribution duct, the second air distribution duct comprising a plurality of laterally spaced baffles angularly disposed inside the duct that divide and redirect the stream into an inside plenum of the PTAC to be combined with recirculated in-room air.