Systems and methods for pressure control in a CO<sub>2 </sub>refrigeration system
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Solution Overview
Problem
Traditional pressure control mechanisms in CO2 refrigeration systems are inefficient, leading to wasted energy and suboptimal performance.
Innovation Solution
A system incorporating a pressure sensor, a gas bypass valve, a parallel compressor, and a controller that measures pressure and adjusts the operation of both the gas bypass valve and parallel compressor to maintain optimal pressure within the receiving tank, using threshold values to determine when to activate or deactivate components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a pressure-relieving valve is used to vent excess refrigerant vapor, then the pressure within the refrigeration system can be controlled, but energy is wasted and system performance becomes suboptimal
Solution Approach 1:
The system divides the compression function into multiple compressors operating in parallel, allowing selective operation based on system needs. This segmentation enables more precise pressure control compared to a single compressor with pressure-relieving valve, reducing energy waste by avoiding unnecessary compression and venting cycles.
Solution Approach 2:
The controller dynamically adjusts operating parameters (on/off timing) of compressors based on pressure sensor feedback. This parameter change approach allows the system to maintain pressure control while optimizing energy consumption, unlike the static pressure-relieving valve approach that continuously vents refrigerant.
2Stress or pressure
If a pressure-relieving valve is used to control pressure, then excess pressure can be released, but system performance becomes suboptimal
Solution Approach 1:
The system implements a feedback control mechanism where a pressure sensor continuously monitors system pressure and provides feedback to the controller. The controller then adjusts compressor operation accordingly, enabling precise pressure control that maintains optimal system performance without the losses associated with pressure-relieving valves.
Solution Approach 2:
The parallel compressor system with feedback control effectively serves itself by automatically adjusting its operation based on pressure conditions. This self-regulating mechanism eliminates the need for wasteful pressure-relieving valve operation while maintaining productivity.
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 enhances the efficiency of the CO2 refrigeration system by reducing energy consumption and improving performance by dynamically controlling pressure within the receiving tank.
Implementation Method 1
The pressure sensor is configured to measure a pressure within a receiving tank of the CO2 refrigeration system
Implementation Method 2
The gas bypass valve is fluidly connected with an outlet of the receiving tank and arranged in series with a compressor
Implementation Method 3
The parallel compressor is fluidly connected with the outlet of the receiving tank and arranged in parallel with both the gas bypass valve and the compressor
Implementation Method 4
evaporated to provide cooling by absorbing heat into the refrigerant
Implementation Method 5
cooled/condensed to a lower temperature state (e.g., in a gas cooler or condenser which absorbs heat from the refrigerant)
Data Source
AI summary
Systems and methods for controlling pressure in a CO2 refrigeration system are provided. The pressure control system includes a pressure sensor, a gas bypass valve, a parallel compressor, and a controller. The pressure sensor is configured to measure a pressure within a receiving tank of the CO2 refrigeration system. The gas bypass valve is fluidly connected with an outlet of the receiving tank and arranged in series with a compressor of the CO2 refrigeration system. The parallel compressor is fluidly connected with the outlet of the receiving tank and arranged in parallel with both the gas bypass valve and the compressor of the CO2 refrigeration system. The controller is configured to receive a pressure measurement from the pressure sensor and operate both the gas bypass valve and the parallel compressor, in response to the pressure measurement, to control the pressure within the receiving tank.