CO2 Refrigeration Pressure Relief for Shutdown Heat Exposure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
CO2 refrigeration systems in transport refrigeration face excessive pressure issues on both the high and low pressure sides, especially during high ambient temperature conditions, which existing safety protocols do not adequately address, particularly when the system is shut down.
Innovation Solution
A pressure relief device is implemented on the low pressure side of the CO2 vapor compression system to prevent pressures from reaching unsafe levels during shutdown and high temperature exposure, complementing existing high pressure relief mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief device is added on the low pressure side, then safety during shutdown and high temperature conditions is improved, but device complexity increases
Solution Approach 1:
The pressure relief system is segmented into two independent parts: a high pressure side relief device and a low pressure side relief device. Each device operates independently to protect its respective side of the system, allowing the low pressure side to be protected without interfering with the existing high pressure side protection system.
Solution Approach 2:
A pressure equalization valve is introduced as an intermediary component that connects the high pressure side and low pressure side relief devices. This valve allows pressure to equalize between sides during shutdown conditions, enabling the low pressure side relief device to function effectively without compromising the high pressure side protection.
2Object-affected harmful factors
If CO2 is used as refrigerant, then environmental benefits are improved, but pressure management complexity increases due to higher operating pressures
Solution Approach 1:
The pressure management system is divided into separate high pressure side and low pressure side relief devices, each optimized for its specific pressure range. This segmentation allows CO2's high pressure operation to be managed safely by dedicating specific relief mechanisms to each side of the system.
Solution Approach 2:
The system uses pressure equalization to dynamically change pressure parameters between the high pressure side and low pressure side during shutdown conditions. The pressure equalization valve allows pressure to equalize, transforming the extreme pressure differential into a more manageable state for relief device operation.
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 manages pressure relief on the low pressure side during shutdown and high temperature conditions, ensuring safety and preventing damage to the system by releasing excess pressure before it becomes hazardous.
Implementation Method 1
a pressure relief device which responsively opens to at least partially allow the refrigerant to be released to the atmosphere in the event that prescribed pressure levels are exceeded
Data Source
AI summary
A CO2 vapor compression system is provided with at least one pressure relief device which is designed to open when the pressure in the low pressure side exceeds the predetermined level because of exposure to high temperatures during non-operational periods. A pressure relief device is provided near the compressor suction inlet to relieve one section of the circuit and another is provided upstream of an unloading valve to relieve pressure in another section thereof.