Container Generator Set Start-Stop Control for Refrigeration Demand
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Solution Overview
Problem
Temperature-controlled shipping containers face challenges in maintaining consistent power for refrigeration units during extended transit periods without external power sources, leading to inefficient energy use and potential cargo spoilage.
Innovation Solution
A generator set with a prime mover, generator, and controller that operates in start/stop mode based on cooling demand, optimizing energy usage by selectively starting and stopping the prime mover to power the air-conditioning unit, thereby reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the generator operates continuously to ensure uninterrupted power supply, then reliability of power supply is improved, but fuel consumption increases
Solution Approach 1:
The generator set transitions from static continuous operation to dynamic start/stop operation based on real-time cooling demand. The controller dynamically adjusts generator operation by starting it when cooling is needed and stopping it when cooling demand is satisfied, optimizing the balance between reliability and fuel consumption.
Solution Approach 2:
The system changes the operational parameter of the generator from continuous running to intermittent running based on temperature and cooling demand parameters. This parameter change allows the system to maintain reliability when needed while reducing fuel consumption during periods of low or no cooling demand.
2Use of energy by moving object
If the generator operates in start/stop mode to reduce fuel consumption, then fuel efficiency is improved, but power supply continuity may be compromised
Solution Approach 1:
The controller implements feedback control by continuously monitoring cooling demand and temperature conditions, then adjusting generator operation accordingly. This feedback mechanism ensures the generator starts when power is needed and stops when it is not, maintaining both fuel efficiency and adequate power supply continuity.
Solution Approach 2:
The generator operates in periodic start/stop cycles rather than continuous operation. This periodic action is triggered by cooling demand conditions, allowing the system to achieve fuel efficiency through reduced running time while maintaining power supply continuity through timely restarts when needed.
3Power
If the generator is sized to meet peak cooling demand, then cooling capacity is sufficient, but fuel consumption during partial load operation increases
Solution Approach 1:
Rather than running a large generator at partial load continuously, the system applies partial action by operating the generator only when cooling demand exists and sizing it appropriately for the actual intermittent load requirements. This reduces fuel consumption during partial load operation while maintaining sufficient cooling capacity when needed.
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 solution provides significant fuel savings and effective temperature control by adapting power generation to demand, ensuring the integrity of perishable goods during transportation.
Implementation Method 1
a generator coupled to the prime mover
Data Source
AI summary
A generator set including a prime mover, a generator coupled to the prime mover, and a controller that is associated with a temperature controlled space and operates the generator set in one of a start/stop mode and a continuous mode depending on a demand defined at least in part by contents within the temperature controlled space.