Method of operating a makeup air module of an air conditioner unit
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Solution Overview
Problem
Air conditioning units often struggle to adequately condition outdoor makeup air, leading to temperature imbalances in the conditioned space due to insufficient cooling or heating capacity, equipment malfunctions, or extreme outdoor temperatures, which negatively impact indoor comfort and space temperature.
Innovation Solution
An air conditioning system with a refrigeration loop, indoor and outdoor heat exchangers, a variable speed compressor, and auxiliary fan, controlled by a controller that adjusts fan speeds and introduces outdoor makeup air to maintain a predetermined temperature differential, using supplemental heating when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If outdoor makeup air is introduced to provide fresh air ventilation, then indoor air quality is improved, but the temperature control stability deteriorates when outdoor temperatures are extreme
Solution Approach 1:
The controller continuously monitors the temperature differential between inlet and mixed discharge air flows, and automatically adjusts the auxiliary fan speed or compressor operation in response to deviations from the predetermined range, creating a closed-loop feedback system that maintains temperature stability while introducing makeup air
Solution Approach 2:
The system dynamically adjusts the operating parameters of the auxiliary fan and compressor based on real-time temperature conditions, allowing the makeup air flow rate and cooling capacity to vary according to outdoor temperature extremes, thereby maintaining indoor temperature stability across different operating conditions
2Power
If the air conditioning unit operates at maximum cooling capacity, then the cooling performance is improved, but the ability to maintain temperature differential deteriorates when outdoor air is too hot
Solution Approach 1:
The controller dynamically adjusts the auxiliary fan speed and compressor operation based on the outdoor air temperature and the measured temperature differential, optimizing the balance between cooling capacity and temperature control effectiveness under varying outdoor conditions
3Productivity
If the auxiliary fan introduces makeup air at high speed, then the fresh air ventilation effectiveness is improved, but the temperature control accuracy deteriorates
Solution Approach 1:
The auxiliary fan operates at variable speeds controlled by the controller, which adjusts the fan speed dynamically based on outdoor temperature conditions and the measured temperature differential, allowing the system to optimize between ventilation effectiveness and temperature control accuracy
Solution Approach 2:
The controller uses feedback from temperature sensors to continuously monitor the temperature differential and adjust the auxiliary fan speed accordingly, reducing fan speed when temperature control accuracy is compromised while maintaining adequate ventilation
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
Effectively conditions indoor and outdoor air to maintain a stable temperature in the conditioned space, enhancing comfort and preventing temperature deviations caused by outdoor air extremes or equipment issues.
Implementation Method 1
a refrigeration loop comprising an indoor heat exchanger and an outdoor heat exchanger
Implementation Method 2
a compressor operably coupled to the refrigeration loop and being configured to urge refrigerant through the refrigeration loop
Implementation Method 3
an auxiliary fan operable to urge an outdoor makeup air flow to combine with the inlet flow to produce a mixed discharge air flow
Data Source
AI summary
An air conditioning system includes a refrigeration loop includes an indoor fan operable to urge an inlet flow of indoor air through an indoor heat exchanger, an auxiliary fan operable to urge an outdoor makeup air flow to combine with the inlet flow to produce a mixed discharge air flow, and a controller. The controller is configured to operate a compressor at a first compressor speed, operate the indoor fan at a first indoor fan speed, operate the auxiliary fan at a first auxiliary fan speed, determine a temperature of the inlet flow of indoor air, determine a temperature of the mixed discharge air flow, determine that a temperature differential between the inlet flow temperature and the mixed discharge flow temperature deviates from a predetermined range, and implement a responsive action in response to determining the temperature differential deviates from the predetermined range.