RV Air Conditioning Load Sharing for 30 Amp Power Constraint
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Solution Overview
Problem
Recreational vehicles often face power limitations, particularly with 30 Amp services, which can lead to tripped circuit breakers when multiple rooftop air conditioning units are used, resulting in insufficient cooling or heating capacity and inability to control different zones effectively.
Innovation Solution
A recreational vehicle air conditioning system that supports multiple air conditioning units with a controller to regulate overall power consumption, allowing for shared operation between units and adjustable refrigerant flow, enabling efficient cooling of multiple zones while managing power usage within the vehicle's capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple rooftop air conditioning units are installed to provide sufficient cooling capacity and zone control, then the cooling capacity and zone control capability are improved, but the power consumption increases and may exceed the allowable current of 30 Amp services
Solution Approach 1:
The system dynamically adjusts the operation of multiple AC units based on real-time power availability and cooling demands. The controller monitors power consumption and automatically modulates compressor speeds and refrigerant flow to maintain cooling capacity within safe electrical limits, preventing circuit breaker trips while maximizing the use of available power.
Solution Approach 2:
The system changes operational parameters such as compressor speed, refrigerant flow rate, and unit activation status based on power availability. By varying these parameters, the system can operate multiple AC units efficiently within the constraints of 30 Amp service, optimizing cooling output without exceeding electrical capacity.
2Adaptability or versatility
If multiple rooftop air conditioning units are operated concurrently to cool different zones, then the zone control capability is improved, but the circuit breaker may trip and cut all power to the RV
Solution Approach 1:
The controller continuously monitors power consumption, temperature, and operational status of each AC unit, and adjusts their operation accordingly. This feedback mechanism ensures that the total power draw remains within safe limits while maintaining appropriate cooling in each zone, preventing circuit breaker trips and ensuring reliable power supply.
Solution Approach 2:
The system dynamically balances zone control requirements with power supply constraints by adjusting AC unit operation in real-time. When power availability changes or cooling demands vary, the controller redistributes the cooling load across available units to maintain zone control capability without exceeding electrical capacity.
3Reliability
If load shedding is used to prevent circuit breaker tripping, then the power supply stability is improved, but the air conditioning units are shut off completely and temporarily stop cooling or heating the living space
Solution Approach 1:
Instead of binary on/off control, the system uses dynamic modulation of compressor speed and refrigerant flow to continuously adjust cooling output. This allows partial operation of AC units at reduced capacity rather than complete shutdown, maintaining cooling continuity while preventing overcurrent conditions.
Solution Approach 2:
The system applies partial action by operating AC units at reduced capacity rather than full power when power constraints are detected. This partial operation provides sufficient cooling to prevent circuit breaker trips while maintaining continuous cooling service, avoiding the complete shutdown associated with traditional load shedding.
4Reliability
If a third party power center with load shedding is used to manage power distribution, then the power supply stability is improved, but the system complexity increases and devices are shut off completely during overload conditions
Solution Approach 1:
The AC units themselves perform the load management function through integrated controllers that monitor and adjust their own operation and that of other units. This self-service approach eliminates the need for external power centers, reducing system complexity while maintaining power supply stability through intelligent control of multiple units.
Solution Approach 2:
The patent combines the functions of multiple AC units and their control systems into a coordinated network managed by a central controller. This integration allows the system to manage power distribution and cooling load internally without requiring separate third-party power management equipment, reducing overall system 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
The system ensures reliable cooling and heating across multiple zones by optimizing power consumption and avoiding overcurrent situations, eliminating the need for third-party power centers and providing granular climate control without the noise and complexity of traditional RV AC units.
Implementation Method 1
a compressor for cooling a zone in a living space of the recreational vehicle
Implementation Method 2
an evaporator coupled to the compressor and configured to receive refrigerant from the compressor
Implementation Method 3
a condenser coupled to the evaporator and configured to receive refrigerant from the evaporator
Data Source
AI summary
A recreational vehicle air conditioning system supports multiple recreational vehicle air conditioning units having closed air conditioning circuits and a controller that is electronically coupled to each of the recreational vehicle air conditioning units to control each of the closed air conditioning circuits to regulate an overall power consumption of the multiple recreational vehicle air conditioning units. A recreational vehicle air conditioning system may also support multiple recreational vehicle air conditioning units where a refrigerant line set is coupled between the recreational vehicle air conditioning units such that a compressor in one of the recreational vehicle air conditioning units is capable of supplying refrigerant to the evaporators of the multiple recreational vehicle air conditioning units, and such that valves coupled in series with each of the evaporators may be regulated to control cooling by each recreational vehicle air conditioning unit.