Two phase loop distributed HVACandR system
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Solution Overview
Problem
Conventional HVAC&R systems incur energy waste by reheating cooled air to maintain comfort in areas requiring heating, as they typically operate with single-phase heat transfer loops and are inefficient at transferring heat between different building areas simultaneously.
Innovation Solution
A two-phase loop distributed HVAC&R system that includes a pumping device, secondary HVAC&R units, and a primary HVAC&R unit, with a controller to manage the flow of a two-phase medium, allowing for efficient heating and cooling by minimizing temperature lift and optimizing energy use through varying capacities and heat exchanger operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional single-phase HVAC systems are used to cool areas, then cooling is achieved, but energy waste occurs when the cooled air must be reheated for areas requiring heating
Solution Approach 1:
The system divides the building into multiple zones with independent secondary HVAC units, each capable of operating autonomously. The primary loop distributes two-phase refrigerant to multiple secondary units, allowing each zone to be heated or cooled independently based on its specific requirements, eliminating the need to reheat cooled air for heating zones.
Solution Approach 2:
The system utilizes two-phase refrigerant (liquid and vapor states) in the primary heat transfer loop. The refrigerant absorbs and releases latent heat during phase transitions, enabling efficient heat transfer between zones. This allows the system to simultaneously extract heat from cooling zones and deliver it to heating zones without energy waste.
2Loss of energy
If single-phase heat transfer loops are used, then system simplicity is maintained, but heat transfer efficiency between different building areas is poor
Solution Approach 1:
The system employs two-phase refrigerant circulation where the refrigerant undergoes phase changes (evaporation and condensation) to transfer heat efficiently. In the primary loop, refrigerant evaporates in cooling zones absorbing heat, then condenses in heating zones releasing heat, achieving high heat transfer efficiency despite increased system complexity.
Solution Approach 2:
The system uses variable capacity control where secondary HVAC units and the primary pump can operate at different capacities dynamically adjusted to meet varying zone requirements. This dynamic operation optimizes heat transfer efficiency across different building areas while managing the complexity of the two-phase system.
3Loss of energy
If conventional HVAC systems operate at fixed capacity, then system simplicity is maintained, but energy efficiency is reduced when varying capacities are needed
Solution Approach 1:
The system implements variable capacity operation where the primary pump and secondary HVAC units can independently adjust their operating capacities based on real-time heating and cooling demands in different zones. This dynamic adjustment optimizes energy efficiency by matching system output to actual load requirements, though it increases control system complexity.
Solution Approach 2:
The system uses control systems that monitor temperature and load conditions in various zones, providing feedback to adjust the operation of secondary HVAC units and the primary pump. This feedback mechanism enables energy-efficient variable capacity operation by continuously optimizing system performance based on actual building conditions.
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 effectively reduces energy waste by efficiently transferring heat between areas, allowing simultaneous heating and cooling, and optimizing energy use by varying capacities and heat exchanger operations, thereby enhancing the overall efficiency of HVAC&R operations.
Implementation Method 1
two-phase loop distributed HVAC&R system that includes a pumping device, secondary HVAC&R units, and a primary HVAC&R unit, with a controller to manage the flow of a two-phase medium, allowing for efficient heating and cooling by minimizing temperature lift
Implementation Method 2
optimizing energy use through varying capacities and heat exchanger operations
Data Source
AI summary
An HVAC&R system including a pumping device configured to circulate a first two-phase medium, a plurality of secondary HVAC&R units, wherein at least one of the plurality of secondary HVAC&R units is operably coupled to the pumping device, and a primary HVAC&R unit operably coupled to at least one of the plurality of secondary HVAC&R units, wherein the pumping device, a portion of the plurality of secondary HVAC&R units, and a portion of the primary HVAC&R unit form a primary loop.