System and method for generating white noise using a packaged terminal air conditioner unit
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Solution Overview
Problem
Packaged terminal air conditioner units lack an effective method to generate white noise independently of the indoor fan, which can create undesirable air currents and fail to adequately mask ambient noise disturbances.
Innovation Solution
The solution involves a packaged terminal air conditioner unit with an outdoor fan that can be controlled to generate white noise, operating independently of the indoor fan, by receiving a command to produce noise and adjusting its speed to achieve desired decibel levels, thereby masking ambient noise without creating air currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the indoor fan is operated to generate white noise, then ambient noise is masked, but undesirable air currents are created within the room
Solution Approach 1:
The patent separates the noise generation function from the air circulation function by using the outdoor fan exclusively for noise generation while the indoor fan handles air circulation. This segmentation allows white noise to be produced without creating uncomfortable air currents in the occupied space.
Solution Approach 2:
The outdoor fan acts as an intermediary device that generates white noise without directly interacting with the indoor air environment. By positioning the fan in the outdoor portion and using the bulkhead as a barrier, the system mediates between the need for noise masking and the need to avoid air current generation.
2Object-affected harmful factors
If the indoor fan is used for white noise generation, then noise masking is achieved, but the system complexity increases due to additional control requirements
Solution Approach 1:
The outdoor fan is designed to serve multiple functions: it provides air circulation during cooling/heating operations and generates white noise during idle periods. This multi-functionality eliminates the need for a separate noise generation device and simplifies the overall control system architecture.
Solution Approach 2:
The controller automatically manages the outdoor fan's dual role by activating it for noise generation when the air conditioner is idle and deactivating it when cooling or heating is required. This self-service approach reduces control complexity by using existing control logic to manage the fan's multiple functions without requiring additional dedicated control systems.
3Object-affected harmful factors
If the outdoor fan operates at high speed to generate sufficient white noise, then noise masking is effective, but energy consumption increases
Solution Approach 1:
The outdoor fan operates dynamically at different speeds based on the required noise masking level. The controller adjusts the fan speed to provide sufficient white noise generation while minimizing energy consumption, rather than running at constant high speed. This dynamic operation optimizes the balance between noise masking effectiveness and energy efficiency.
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 approach effectively generates white noise to mitigate noise spikes and disturbances, improving occupant comfort by raising the nominal room noise level, making loud sounds less disturbing and ensuring better sleep quality by reducing decibel spikes.
Implementation Method 1
operating the outdoor fan to generate the white noise
Data Source
AI summary
A packaged terminal air conditioner unit (PTAC) includes a bulkhead that defines an indoor portion and an outdoor portion. An outdoor fan is positioned within the outdoor portion and a controller is communicatively coupled with the outdoor fan for receiving a command to generate white noise and operating the outdoor fan to create the white noise at a desired decibel level to block out ambient sounds. A user may regulate the outdoor fan speed when the PTAC is not heating or cooling by setting a desired decibel level, e.g., using a control panel of the PTAC.