Cool Drying Control for Stable Dew Point and Lower Energy Use
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Solution Overview
Problem
Existing cool drying devices face issues with heat exchanger overheating and energy inefficiency due to continuous operation, leading to temperature and dew point peaks, and require heavy thermal masses and complex constructions.
Innovation Solution
A cool drying device with a control system that includes temperature and flow measurements to activate the cooling circuit only when necessary, maintaining the lowest air temperature within specific ranges to prevent condensation and corrosion, eliminating the need for additional thermal mass and optimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the cooling circuit is switched off after reaching a certain temperature, then energy can be saved, but temperature peaks occur when compressed air is taken off again
Solution Approach 1:
The control device activates the cooling circuit in advance before compressed air take-off begins, ensuring the heat exchanger is already at the required temperature when drying is needed, thereby preventing temperature peaks while avoiding continuous operation
Solution Approach 2:
The control device continuously monitors temperature and takes-off conditions, using feedback signals to dynamically switch the cooling circuit on or off, optimizing energy consumption while maintaining reliable temperature control
2Reliability
If the cooling circuit remains continuously on, then temperature control is stable, but energy consumption increases
Solution Approach 1:
The cooling circuit operation transitions from static continuous operation to dynamic on-demand operation, adjusting its state based on real-time take-off conditions and temperature requirements, thereby reducing energy consumption while maintaining stability when needed
Solution Approach 2:
The cooling circuit operates periodically rather than continuously, being activated only during periods when compressed air take-off is detected and deactivated when no take-off is present, optimizing energy efficiency
3Loss of energy
If a thermal mass is added to cool compressed air, then the cooling circuit can be switched off earlier, but the device becomes heavy and sizeable
Solution Approach 1:
The invention extracts and eliminates the thermal mass component (reservoir with water-glycol mixture) from the system, replacing it with a control strategy that uses the existing heat exchanger and refrigeration circuit, thereby reducing device weight and complexity while achieving similar energy-saving effects
4Loss of energy
If additional parts such as reservoir and heat exchanger are added, then thermal mass cooling is achieved, but construction becomes expensive and complicated
Solution Approach 1:
The heat exchanger serves multiple functions: it acts as the primary cooling component during active cooling and as a thermal buffer during standby periods, eliminating the need for separate thermal mass reservoirs and reducing overall system complexity
Solution Approach 2:
The control strategy merges the cooling function and thermal storage function into a single integrated system, using the refrigeration circuit and heat exchanger for both active cooling and passive temperature maintenance, thereby simplifying construction
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 prevents heat exchanger overheating, ensures consistent dew point control, and significantly reduces energy consumption by switching off the cooling circuit during low demand, maintaining efficient operation across varying ambient temperatures.
Implementation Method 1
a heat exchanger whose primary part is the vaporizer of a cooling circuit
Implementation Method 2
by lowering the air or gas temperature in the vaporizer, moisture in the air or gas will condense
Implementation Method 3
a condenser, an expansion means between the outlet of the condenser and the inlet of the vaporizer
Data Source
AI summary
Device for cool drying comprising a heat exchanger (2) whose primary part is the vaporizer (3) of a cooling circuit (4) which also includes a compressor (6) driven by a motor (5), a control device (16) for this motor (5) and measuring device (17) for the lowest air temperature (LAT), measuring device (18) for the ambient temperature (Tamb) and a flow meter (19), whereby this control device (16) can be at least switched in a first user mode in which the cooling circuit (4) is only activated when the gas flow exceeds a preset value and a second user mode in which the lowest air temperature (LAT) is maintained within a certain range by controlling the cooling circuit (4).