A system and method for improving efficiency of a refrigerant based system
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Solution Overview
Problem
Refrigerant-based air-conditioning, refrigeration, and heating systems are inefficient, accounting for up to 60% of energy demand in office and residential installations, with limited reduction in running costs despite recent advancements, leading to higher energy consumption compared to other sectors.
Innovation Solution
A refrigerant-based system incorporating a heat exchanger, temperature sensors, a microprocessor, and a computer-readable storage medium that controls the compressor based on predetermined temperature and operation time conditions to optimize energy usage, turning it off when specific temperature and time criteria are met, thereby reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor operates continuously to maintain temperature, then temperature control reliability is improved, but energy consumption increases
Solution Approach 1:
The control system implements periodic operation of the compressor by switching it on and off based on temperature conditions. The compressor operates periodically rather than continuously, reducing energy consumption while maintaining temperature control reliability through automated on/off cycling based on sensor feedback.
Solution Approach 2:
The system uses temperature sensors to continuously monitor the enclosed space temperature and heat exchanger temperature, feeding this information back to the microprocessor. The microprocessor adjusts compressor operation based on this feedback, ensuring reliable temperature control while optimizing energy usage by operating the compressor only when necessary.
2Reliability
If the compressor operates for longer periods to ensure minimum heat exchanger temperature, then heat exchanger performance is improved, but running costs increase
Solution Approach 1:
The control system monitors heat exchanger temperature and operates the compressor in advance to maintain minimum temperature requirements before they are critically needed. By proactively managing heat exchanger temperature through timed compressor operation, the system ensures performance reliability while avoiding excessive energy consumption.
Solution Approach 2:
The system dynamically adjusts compressor operation duration based on real-time heat exchanger temperature conditions. Rather than fixed operation schedules, the compressor run time varies dynamically to maintain minimum heat exchanger temperature while minimizing energy consumption, directly addressing the contradiction between performance and running costs.
3Device complexity
If the system uses traditional on/off control based only on medium temperature, then control simplicity is maintained, but energy efficiency deteriorates
Solution Approach 1:
The microprocessor-based control system performs multiple functions: monitoring medium temperature, monitoring heat exchanger temperature, tracking operation time, determining minimum temperatures, and controlling compressor operation. This multi-functional approach improves energy efficiency while maintaining reasonable system complexity by consolidating control functions in a single intelligent controller.
Solution Approach 2:
The system implements comprehensive feedback control by monitoring both medium temperature and heat exchanger temperature, along with operation time parameters. This enhanced feedback mechanism enables more efficient compressor control decisions compared to simple on/off control, improving energy efficiency while the microprocessor manages the increased control complexity.
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 significantly reduces running costs, enhances efficiency in temperature control, and minimizes greenhouse gas production by using less energy, while also reducing heat emission in enclosed spaces, particularly in crowded areas.
Implementation Method 1
a compressor and an associated condenser (or heat exchanger), which are used to convert low-pressure refrigerant vapor into high-pressure liquid refrigerant for cooling purposes. In this compression of vapor, a very large amount of heat is generated
Implementation Method 2
The high-pressure liquid refrigerant is then transported to an evaporator (or heat exchanger) and is allowed to decompress there back to a vapor. In this decompression phase change process, the evaporator/second heat exchanger temperature reduces significantly and the reduction in temperature is limited by a significant amount of heat which is absorbed from the air passing through the evaporator/second heat exchanger
Data Source
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AI summary
The present invention is designed to reduce running costs in refrigerant based air-conditioning, refrigeration and heating systems by using a combination of thermodynamic and hydraulic control to manage the on and off states of the compressor, which is the main energy consuming component. Thermodynamic or temperature control is used to manage comfort levels within the room or space being cooled. Hydraulic control is used to determine when the compressor has completed its useful work in delivering a supply of high-pressure liquid refrigerant. Once temperature and hydraulic conditions are satisfied the compressor can be turned off; thereby delivering a significant reduction in running costs.