Pre-emptive Air Dryer Control in Compressed Systems
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Solution Overview
Problem
Air dryer refrigerant temperature rises significantly when idle, leading to delayed cooling and ineffective moisture removal upon restart, resulting in undried air being supplied during the transition period.
Innovation Solution
A fluid compression system with a refrigerated dryer and pressure sensor that initiates operation of the refrigerated dryer before the compressor, ensuring dry air is available at the point of use by allowing sufficient time for refrigerant cooling before compressor startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the refrigerated dryer is turned off with the compressor during idle periods, then energy consumption is reduced, but the refrigerant temperature rises significantly above the optimum operating value
Solution Approach 1:
The system performs preliminary cooling of the refrigerant by initiating the refrigerated dryer operation before the compressor starts. This advance action ensures the refrigerant is already at optimal temperature when compressed air begins flowing, preventing the temperature rise that would occur if the dryer started after the compressor.
2Device complexity
If the refrigerated dryer is restarted together with the compressor after idle periods, then device complexity is reduced, but it takes time for the refrigerant to cool to optimum operating temperature
Solution Approach 1:
The control system implements preliminary action by starting the refrigerated dryer before the compressor. This sequencing ensures the refrigerant cooling process begins in advance, eliminating the delay that would occur if both devices started simultaneously after an idle period.
3Ease of operation
If the refrigerated dryer starts after the compressor, then the control sequence is simplified, but wet air is directed to the point of use during the cooling period
Solution Approach 1:
The system applies preliminary action by initiating the refrigerated dryer operation before the compressor starts. This ensures the refrigerant is already cooled and the drying function is active before wet compressed air begins flowing through the system, preventing moisture from reaching the point of use.
Solution Approach 2:
The system implements preliminary anti-action by having the refrigerated dryer ready and active before the compressor delivers wet air. This advance preparation creates a protective effect that prevents the harmful introduction of moisture into the compressed air system from the outset.
4Reliability
If the refrigerated dryer operates continuously, then dry air is always supplied, but energy consumption increases significantly
Solution Approach 1:
The system implements periodic action by operating the refrigerated dryer in cycles rather than continuously. The dryer is activated before the compressor starts and operates during compression cycles, maintaining reliable dry air supply while avoiding the excessive energy consumption of continuous 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
Ensures that dry compressed air is consistently supplied by allowing the refrigerated dryer to pre-cool before the compressor starts, preventing moisture and contaminants from reaching the air system, thus maintaining optimal operating conditions.
Implementation Method 1
a refrigerated dryer coupled to the compressor and operable to separate the first flow of compressed fluid into a second flow of compressed fluid and a flow of liquid
Implementation Method 2
separate the first flow of compressed fluid into a second flow of compressed fluid and a flow of liquid
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A fluid compression system includes a compressor (14) operable to produce a first flow of compressed fluid and a refrigerated dryer (18) coupled to the compressor (14) and operable to separate the first flow of compressed fluid into a second flow of compressed fluid and a flow of liquid. A first sensor (58) is positioned to measure a property of the second flow of compressed fluid, and a controller (60) is operable to initiate operation of the refrigerated dryer (18) at a first time and at least partially in response to the measured property, and to initiate operation of the compressor (14) at a second time. The first time is before the second time.