Transport Refrigeration Fan Power Split With 48 V Auxiliary Supply
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Solution Overview
Problem
Existing transport refrigeration machines in utility road vehicles are limited by high-voltage energy sources that cannot provide arbitrarily low or high power, leading to inefficiencies and the need for cost-intensive components to supply lower voltage systems.
Innovation Solution
Incorporating a 48 V auxiliary energy source, such as solar modules or 48 V energy stores, to supply fans and specific components while maintaining high-voltage energy source operation, allowing for efficient power distribution and reduced component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high-voltage energy source (generator or high-voltage battery) is used to supply the transport refrigeration machine, then high instantaneous power can be provided, but the energy source cannot provide arbitrarily low or high power and produces more power than currently required
Solution Approach 1:
The power supply system is segmented into two independent sources: a high-voltage energy source (260-540 V) for temperature-influencing components and a 48 V auxiliary energy source for fans. This segmentation allows each source to operate independently at its optimal power level, preventing the high-voltage source from producing excess power while still meeting peak demand requirements.
Solution Approach 2:
The system changes the voltage parameter by introducing a 48 V auxiliary energy source alongside the high-voltage source. This parameter change enables differentiated power distribution where low-power consumers (fans) are supplied at 48 V while high-power consumers (temperature-influencing components) receive power from the high-voltage source, optimizing overall system efficiency.
2Power
If cost-intensive high-voltage compatible components are used to supply 48 V systems from a high-voltage energy source, then power can be provided, but device complexity and cost increase
Solution Approach 1:
The 48 V fan supply is extracted from the high-voltage system and assigned to a separate 48 V auxiliary energy source. This extraction eliminates the need for costly high-voltage compatible components (DC-DC converters, switches) in the 48 V fan circuit, reducing both device complexity and cost while maintaining power supply capability.
3Loss of energy
If the high-voltage energy source operates at optimal points, then efficiency is improved, but the source cannot adapt to varying power requirements
Solution Approach 1:
The system introduces dynamic adaptability by enabling the 48 V auxiliary energy source to be activated or deactivated based on operating conditions. When activated, it handles fan power requirements, allowing the high-voltage source to operate at optimal points with reduced load, thus improving efficiency while maintaining adaptability to varying power demands.
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
Enables cost-effective and efficient temperature regulation in utility road vehicles by optimizing high-voltage energy source operation and reducing the need for expensive high-voltage compatible components, enhancing power flexibility and energy efficiency.
Implementation Method 1
Incorporating a 48 V auxiliary energy source, such as solar modules or 48 V energy stores, to supply fans and specific components
Implementation Method 2
Incorporating a 48 V auxiliary energy source, such as solar modules or 48 V energy stores
Implementation Method 3
The cooling circuit may comprise a compressor that is driven by an electric motor and serves to compress a coolant
Implementation Method 4
In the heat exchanger, the previously liquefied refrigerant is expanded and in the process draws heat from an air flow guided through the heat exchanger separately from the refrigerant, with the result that the air of the air flow is cooled
Data Source
AI summary
A utility road vehicle includes a transport refrigeration machine having at least one fan which is supplied by a 48 V auxiliary energy source in an auxiliary operating mode.