Variable refrigerant flow (VRF) dehumidification system
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Solution Overview
Problem
Standard VRF systems are unable to effectively maintain targeted humidity levels and temperatures due to limited data points and constant switching between heating and cooling modes, leading to inefficient dehumidification and temperature control.
Innovation Solution
A VRF dehumidification system with a plurality of sensors and electronic expansion valves, controlled by a system controller that regulates refrigerant flow to maintain set dew point parameters, utilizing a condenser module, evaporator coils, and reheat/reclaim coils to achieve precise temperature and humidity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard VRF systems operate with on/off cycling to maintain target temperature, then temperature control is simplified, but dehumidification efficiency deteriorates due to insufficient runtime for moisture condensation
Solution Approach 1:
The system divides the evaporator into multiple independently controllable zones with separate sensors and expansion valves, allowing simultaneous operation in cooling and dehumidification modes without requiring complete system shutdown or mode switching
Solution Approach 2:
The system dynamically adjusts refrigerant flow to each evaporator zone based on real-time sensor feedback, enabling continuous modulation of cooling capacity to maintain both temperature and humidity at target levels without on/off cycling
2Measurement precision
If VRF systems use multiple sensors and coils to achieve precise humidity control, then dehumidification performance is improved, but system complexity increases
Solution Approach 1:
The system uses a single integrated controller that manages multiple evaporator zones, sensors, and expansion valves, allowing the same hardware infrastructure to serve both temperature control and dehumidification functions without requiring separate dedicated systems
Solution Approach 2:
The system combines multiple evaporator zones into a single integrated unit with shared refrigerant circulation, allowing coordinated operation of all zones under unified control to achieve precise humidity management while minimizing overall system complexity
3Temperature
If VRF systems constantly switch between heating and cooling modes, then temperature adjustments are made, but energy efficiency deteriorates due to frequent compressor cycling
Solution Approach 1:
The system maintains continuous compressor operation with variable refrigerant flow to each evaporator zone, eliminating the energy losses associated with frequent compressor startup and shutdown while still achieving the required temperature adjustments through dynamic flow modulation
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 system allows for efficient dehumidification and temperature customization, achieving targeted humidity levels and maintaining set temperatures, improving comfort and reducing energy usage and spoilage in various applications.
Implementation Method 1
The refrigerant is then passed into a heat exchanger, or condensing coil, where heat from the superheated and compressed gaseous refrigerant is bled off to the outside air thereby cooling the refrigerant
Implementation Method 2
Air from inside the building is passed over the cooled liquid refrigerant and as the building's inside air is warmer than the cooled liquid refrigerant, heat is transferred from the inside air to the refrigerant
Implementation Method 3
As the liquid refrigerant heats back up, it travels back into the compressor where it transitions back to a gaseous state and the cycle is completed and started anew
Data Source
AI summary
A Variable Refrigerant Flow (VRF) dehumidification system. The system has at least one condenser module in fluid communication with one or more indoor air handlers. At least one evaporator coil is in fluid communication with the indoor air handlers and at least one reheat/reclaim coil. The evaporator and reheat/reclaim coils are also in communication with the condenser module. A plurality of electronic expansion valves (EEVs) are in fluid communication with the indoor air handlers. A plurality of sensors is disposed in the system and are in communication with at least one VRF dehumidification system controller. In one embodiment, a logic is stored in a non-transitory computer readable medium that, when executed by one or more processors, causes the VRF dehumidification system to monitor the data input from the plurality of sensors and regulates the capacity of the VRF dehumidification system needed to maintain a set dew point parameter.