Dual-Loop Dehumidification System with Modulating Valve for Efficiency
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Solution Overview
Problem
Current dehumidifiers are inefficient in reducing humidity levels, particularly in applications like fire and flood restoration, where rapid water removal is necessary, and they often require additional components like sub-cooling coils to enhance efficiency.
Innovation Solution
A dehumidification system with a secondary evaporator and condenser that causes part of the refrigerant to evaporate and condense twice in a single refrigeration cycle, increasing compressor capacity without adding power, and includes a modulating valve to direct refrigerant flow based on temperature setpoints, utilizing a closed refrigeration loop with a water-cooled heat exchanger for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional single evaporator and condenser system is used, then the device complexity is low, but the dehumidification efficiency and productivity are insufficient
Solution Approach 1:
The system divides the refrigeration cycle into two separate loops: a primary loop with a first evaporator and first condenser, and a secondary loop with a second evaporator and second condenser. This segmentation allows each evaporator to independently process airflow, doubling the dehumidification capacity without requiring a single oversized component, thus improving productivity while managing complexity through modular architecture
Solution Approach 2:
The refrigerant serves multiple functions by circulating through both primary and secondary evaporators and condensers. The same refrigerant system provides cooling and dehumidification across two separate airflow paths, allowing the system to handle larger volumes of air and achieve higher dehumidification efficiency without proportionally increasing system complexity
2Productivity
If additional components like sub-cooling coils are added to enhance efficiency, then the dehumidification performance improves, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for sub-cooling coils by using the secondary evaporator- condenser system to achieve the required dehumidification performance. The secondary loop independently handles portions of the refrigerant flow, providing the necessary cooling capacity without requiring additional sub-cooling components, thus improving productivity while reducing device complexity
Solution Approach 2:
The system uses two evaporators and two condensers to provide more dehumidification capacity than a single system would deliver. This partial duplication of components creates excessive action in terms of refrigerant circulation paths, which translates to improved dehumidification efficiency without needing supplementary components like sub-cooling coils
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 configuration increases dehumidification efficiency per kilowatt of power used, allowing for more effective drying in applications like fire and flood restoration by maintaining lower dehumidified airflow temperatures and reducing the need for sub-cooling coils.
Implementation Method 1
the first airflow generated by transferring heat from the inlet airflow to the flow of refrigerant as the inlet airflow passes through the secondary evaporator
Implementation Method 2
the second airflow generated by transferring heat from the first airflow to the flow of refrigerant as the first airflow passes through the primary evaporator
Implementation Method 3
the third airflow generated by transferring heat from the flow of refrigerant to the third airflow as the second airflow passes through the secondary condenser
Implementation Method 4
the dehumidified airflow generated by transferring heat from the refrigerant to the fourth airflow as the fourth airflow contacts the primary condenser
Implementation Method 5
the flow of refrigerant provided to the modulating valve comprising a higher pressure than the flow of refrigerant received at the compressor
Data Source
AI summary
A dehumidification system includes a compressor, a primary evaporator, a primary condenser, a secondary evaporator, a secondary condenser, a modulating valve, and an alternate condenser. The secondary evaporator receives an inlet airflow and outputs a first airflow to the primary evaporator. The primary evaporator receives the first airflow and outputs a second airflow to the secondary condenser. The secondary condenser receives the second airflow and outputs a third airflow to the primary condenser. The primary condenser receives the third airflow and outputs a dehumidified airflow. The compressor receives a flow of refrigerant from the primary evaporator and provides the flow of refrigerant to the modulating valve. The modulating valve directs the flow of refrigerant to the primary condenser and to the alternate condenser. The alternate condenser receives a portion of the flow of refrigerant for heat rejection, where the primary condenser receives the remaining portion of the flow of refrigerant.