Split HVAC Outdoor Metering Control for Missing Indoor Metering Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing split HVAC systems face challenges in efficiently controlling and maintaining performance when the indoor metering device is absent, defective, or operating at diminished capacity, requiring costly replacement of both indoor and outdoor units.
Innovation Solution
The introduction of an adjustable split HVAC system with an outdoor unit equipped with a compressor and an outdoor metering device, controlled by a controller that adapts based on the indoor metering status, allowing for operation even without an indoor metering device, and enabling compatibility with different refrigerants and system parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the indoor metering device is absent or defective, then the system requires replacement of both indoor and outdoor units, but this increases cost and complexity
Solution Approach 1:
The outdoor metering device acts as an intermediary component that compensates for the absent or defective indoor metering device. The controller uses feedback from system parameters to adjust the outdoor metering device, enabling it to serve as a mediator that maintains system functionality without requiring replacement of both indoor and outdoor units.
Solution Approach 2:
The outdoor unit is designed with multi-functionality to perform both its primary cooling/heating functions and an additional function of compensating for the indoor metering device. The outdoor metering device can operate in different modes depending on the indoor metering status, providing universal functionality that covers both normal operation and failure compensation scenarios.
2Productivity
If the indoor metering device is absent or defective, then system performance deteriorates, but replacing both units increases cost
Solution Approach 1:
The controller changes operational parameters by adjusting the outdoor metering device based on detected indoor metering status. This parameter adjustment allows the system to maintain efficient operation without requiring expensive replacement of both indoor and outdoor units, as the outdoor metering device compensates for the indoor deficiency through parameter optimization.
Solution Approach 2:
The system performs self-service by automatically detecting the indoor metering status and adjusting the outdoor metering device accordingly. This self-diagnosis and self-correction mechanism maintains system efficiency without requiring external intervention or expensive hardware replacement, allowing the outdoor unit to serve itself in compensating for indoor deficiencies.
3Adaptability or versatility
If the outdoor unit is controlled without considering indoor metering status, then system adaptability decreases, but adding control complexity increases device complexity
Solution Approach 1:
The controller implements a feedback mechanism that continuously monitors the indoor metering status and uses this information to adjust the outdoor metering device. This feedback loop enables the system to adapt to different indoor metering conditions (present, absent, defective) by automatically modifying outdoor unit operation, providing high adaptability through a relatively simple control architecture.
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 enables cost-effective partial replacement of HVAC systems, improved efficiency, and enhanced reliability by allowing the outdoor unit to compensate for missing or defective indoor metering, reducing replacement costs and noise levels, while matching system capacity to load more accurately.
Implementation Method 1
an outdoor unit including a compressor and an outdoor metering device
Implementation Method 2
an outdoor metering device... an indoor metering device
Implementation Method 3
In a heat-pump mode, heat is extracted from the outdoor ambient environment, and transferred from the outdoor unit to the indoor unit, to heat the indoor space
Implementation Method 4
In an air-conditioning mode, heat is extracted from the indoor space by the air handler and transferred to the outdoor unit to be dissipated into the external ambient environment
Data Source
AI summary
A split heating, ventilation, and air conditional system may include an outdoor unit including a compressor and an outdoor metering device. An indoor unit may be fluidically coupled to the outdoor unit. A controller may be configured to control the outdoor unit and the indoor unit based on an indoor metering status of the indoor unit. The indoor metering status may include at least one of: (i) indoor metering device on, (ii) indoor metering device off, and (iii) indoor metering device absent. In embodiments, an outdoor assembly couplable to an indoor unit of a split system may include the outdoor unit and the controller. A method for controlling a split system including an indoor unit fluidically coupled to an outdoor unit may include controlling, by a controller, based on the indoor metering status of the indoor unit, the outdoor unit and the indoor unit.