Compressed Air Station With Backpressure-Compensated Dryer Cooling
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Solution Overview
Problem
The discharge of waste heat from refrigeration dryers in compressed air stations leads to increased ambient air temperature in plant rooms, reducing the efficiency of compressors and refrigeration dryers, particularly screw compressors.
Innovation Solution
A compressed air station with a dryer exhaust air duct connecting a refrigeration dryer to an exhaust air duct, equipped with a speed-adjustable fan motor and a flow sensor, controls the cooling air flow to maintain a setpoint volume flow despite fluctuating backpressures, ensuring consistent condensation pressure and cooling capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If waste heat from refrigeration dryer is discharged into plant room or incompletely extracted, then the structure is simple, but ambient air temperature increases and efficiency of compressors and refrigeration dryers decreases
Solution Approach 1:
The invention extracts the waste heat discharge path of the refrigeration dryer from the plant room environment by connecting it to the common exhaust air duct. The refrigeration dryer is connected to the exhaust air duct via a dryer exhaust air duct, allowing waste heat to be discharged outside the plant room alongside compressor waste heat, thereby preventing ambient temperature rise while maintaining system efficiency.
Solution Approach 2:
The invention merges the waste heat discharge systems of the refrigeration dryer and compressors into a common exhaust air duct. Both waste heat streams are combined and discharged through the same exhaust path, simplifying the overall discharge structure while ensuring efficient heat removal from the plant room environment.
2Productivity
If fan speed is increased to maintain cooling air flow against backpressure, then cooling capacity is maintained, but energy consumption increases
Solution Approach 1:
The invention implements dynamic control of the fan motor speed based on actual operating conditions. The controller adjusts the fan speed according to the backpressure in the exhaust air duct and the required cooling air volume flow, allowing the system to maintain optimal performance while minimizing energy consumption by adapting to varying load conditions rather than operating at constant high speed.
Solution Approach 2:
The invention incorporates feedback control where the controller monitors the backpressure conditions in the exhaust air duct and adjusts the fan motor speed accordingly. This feedback mechanism ensures that the fan operates at the minimum necessary speed to maintain the required cooling air volume flow, optimizing energy efficiency while preserving cooling capacity.
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
Maintains consistent condensation pressure and cooling capacity of refrigeration dryers by adjusting the fan motor to compensate for backpressures, preventing efficiency loss in compressors and refrigeration dryers.
Implementation Method 1
a compressed air refrigeration heat exchanger is provided within the refrigeration dryer, in which the compressed air is cooled by way of a refrigerant conducted in a refrigerant circuit
Implementation Method 2
the refrigerant circuit comprises a refrigerant compressor, a condenser, an expansion valve and the compressed air refrigeration heat exchanger
Implementation Method 3
the fan is designed to convey the cooling air flow even against a backpressure currently prevailing in the exhaust air duct
Data Source
AI summary
The application relates to a compressed air station comprising at least two compressed air components that yield waste heat, wherein each compressed air component is designed either as a compressor, in particular as a screw compressor, or as a refrigeration dryer, wherein at least one of the compressed air components, namely a refrigeration dryer (12), is connected to the exhaust air duct (13), and wherein a further compressed air component is connected to the same exhaust air duct (13), wherein a compressed air refrigeration heat exchanger (23) is provided within the refrigeration dryer (12), in which the compressed air is cooled by way of a refrigerant conducted in a refrigerant circuit (24), wherein the refrigerant circuit (24) comprises a refrigerant compressor (25), a condenser (26), an expansion valve (27) and the compressed air refrigeration heat exchanger (23), wherein the compressed air station further comprises a dryer exhaust air duct (15), which is provided for discharging a cooling air flow that is conducted through the refrigeration dryer (12), and which connects a cooling air outlet (19) of the refrigeration dryer (12) to a refrigeration dryer connection (16) on the exhaust air duct (13),wherein the refrigeration dryer (12) has a fan (20) with a speed-adjustable fan motor (21), and the fan (20) is designed to convey the cooling air flow even against a backpressure currently prevailing in the exhaust air duct (13), wherein the refrigeration dryer (12) has a flow sensor (30) for detecting a respective current value for the cooling air volume flow Vact, and wherein the refrigeration dryer (12) has a controller (22) or interacts with a controller (22), which is configured and designed to record and process the data from the flow sensor (30) and to actuate the fan motor (21) of the fan (20) in such a way that, regardless of the current backpressure in the exhaust air duct (13), the respective current cooling air volume flow Vact follows a setpoint for the cooling air volume flow Vsoll.