Absorption Refrigeration Heat-Source Control for Off-Level Protection
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Solution Overview
Problem
Single pressure absorption refrigeration (SPAR) systems face premature failure and potential fire hazards due to prolonged operation without leveling, leading to thermo stresses and refrigerant cessation, with existing solutions failing to address these issues effectively.
Innovation Solution
A control method utilizing sensors to monitor cooling unit parameters, a control unit to determine safe operation conditions, and actuators to adjust heat input, including a novel thermocouple interrupt adaptor to manage heat source control, ensuring safe operation and automatic restarts when conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the SPAR system operates without leveling during transit, then portability and ease of operation are improved, but the cooling unit tubing suffers thermo stresses leading to cracking and rupture
Solution Approach 1:
The controller proactively monitors refrigerant circulation and detects cessation before tubing failure occurs. By taking preliminary action to shut off the heat source when circulation stops, the system prevents thermo stress accumulation that would otherwise lead to tubing cracking and rupture during off-level operation.
Solution Approach 2:
The controller continuously monitors refrigerant circulation through sensors and uses this feedback to determine when the absorption cycle has ceased. This closed-loop feedback mechanism enables the controller to respond to changing system conditions in real-time, shutting off the heat source when circulation stops to prevent tubing damage.
2Use of energy by moving object
If the heat source continues operating when the absorption cycle ceases, then energy utilization is improved, but the system experiences overheating leading to fire hazard
Solution Approach 1:
The controller monitors refrigerant circulation and uses this feedback to control heat source operation. When circulation ceases, the controller receives feedback indicating cycle stoppage and automatically shuts off the heat source, preventing overheating and fire hazards while optimizing energy utilization.
Solution Approach 2:
The system uses its own operational parameters (refrigerant circulation status) to automatically control the heat source. The controller self-regulates by monitoring circulation and shutting off heat when needed, eliminating the need for external intervention to prevent overheating.
3Adaptability or versatility
If the refrigerant is allowed to pool during off-level operation, then the system can operate during transit, but the absorption cycle ceases leading to system destruction
Solution Approach 1:
The controller detects refrigerant circulation cessation before it leads to inhibitor crystallization or other destructive effects. By taking preliminary action to shut off the heat source when circulation stops, the system prevents the chain of events that would otherwise lead to destruction during off-level operation.
Solution Approach 2:
The controller continuously monitors refrigerant circulation and uses this feedback to detect when the absorption cycle has ceased due to pooling. This real-time feedback enables the controller to respond by shutting off the heat source, preventing the progression to inhibitor crystallization and system destruction.
4Reliability
If the inhibitor becomes concentrated and crystallized, then the absorption cycle stops, but the system requires hazardous refrigerant disposal
Solution Approach 1:
The controller takes preliminary anti-action by shutting off the heat source when refrigerant circulation ceases, preventing the conditions that lead to inhibitor crystallization. This proactive measure avoids the need for hazardous refrigerant disposal by preventing the crystallization problem before it occurs.
Solution Approach 2:
The controller monitors refrigerant circulation and uses this feedback to detect the onset of inhibitor crystallization conditions. When circulation stops, the controller receives feedback and shuts off the heat source, preventing the progression to full crystallization and the associated disposal requirements.
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 extends the life of the cooling unit, prevents premature failure, reduces energy waste, and minimizes hazardous refrigerant disposal by maintaining safe temperature and pressure limits, even during off-level operation, enhancing the reliability and efficiency of SPAR systems.
Implementation Method 1
sensors which measure cooling unit parameters
Implementation Method 2
actuators which adjust the level of heat input to the cooling unit
Implementation Method 3
a novel thermocouple interrupt adaptor to manage heat source control
Data Source
AI summary
The present invention provides an improved control system and method for the absorption refrigeration process. The system includes sensors that measure the absorption process in order to determine if the absorption cycle is continuous. A control unit in communication with the sensors which compares the measured sensor values to predetermined safe limits. When the control unit determines that safe limits have been exceeded, the control unit communicates with actuators adjusting the absorption cycle heat source, ultimately protecting the absorption refrigeration process from damage. Further, the control may reestablish the absorption cycle heat source when predetermined safe operation conditions are detected.