Water-Based Valve System for HVAC to Reduce Refrigerant Leak Hazards
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Solution Overview
Problem
Conventional direct expansion systems in heating and cooling pose safety risks due to refrigerant leaks, as the refrigerant can displace oxygen and lead to suffocation, and its leakage is often undetectable by sight or smell, necessitating a safer alternative that uses water for increased efficiency and reduced risk of injury.
Innovation Solution
A valve system and method for controlling water distribution in heating, ventilation, air conditioning, refrigeration, and chilling systems, utilizing a cold and hot water supply with control valves, thermostats, and pumps to optimize heat transfer and reduce energy consumption, incorporating a heat recovery chiller to reuse heat energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional direct expansion systems use refrigerant for heating and cooling, then cooling performance is achieved, but safety risks increase due to refrigerant leaks causing oxygen displacement and suffocation
Solution Approach 1:
The patent introduces water as an intermediary fluid to transfer heat between the refrigerant system and the living space. The refrigerant remains confined to the HVAC equipment where leaks are controlled, while water circulates through pipes to deliver cooling or heating to the space, eliminating the hazard of refrigerant exposure to occupants.
Solution Approach 2:
The patent extracts the refrigerant from direct contact with the living space by separating the refrigerant circuit from the space cooling/heating function. The refrigerant operates only in the outdoor unit and heat exchangers, while water serves as the medium that interfaces with the living environment, removing the harmful factor from the space.
2Reliability
If water is used instead of refrigerant for heat transfer, then safety against refrigerant leaks is improved, but system efficiency may deteriorate
Solution Approach 1:
The patent implements continuous circulation of water through the system with pumps maintaining constant flow, and the heat exchangers continuously transfer thermal energy from the refrigerant to the water. This continuous operation maximizes the utilization of thermal energy and maintains high system efficiency despite the fluid substitution.
Solution Approach 2:
The patent optimizes system parameters including water flow rates, heat exchanger surface areas, and temperature differentials to compensate for the lower thermal conductivity of water compared to refrigerant. By adjusting these parameters, the system maintains efficient heat transfer performance while using water as the safe heat transfer medium.
3Measurement precision
If a valve system with multiple control valves and thermostats is implemented, then control precision over water flow is improved, but device complexity increases
Solution Approach 1:
The patent divides the water distribution system into multiple zones with individual control valves and thermostats for each zone. This segmentation allows independent control of different areas, providing precise flow regulation for each space while maintaining overall system manageability through modular design.
Solution Approach 2:
The patent employs dynamically adjustable control valves that can modulate water flow rates in response to real-time temperature sensor feedback from thermostats. This dynamic control enables precise adaptation to varying thermal demands in different zones, optimizing both comfort and energy efficiency despite the increased number of control components.
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 the risk of injury from refrigerant leaks by using water, enhances energy efficiency through heat recovery, and maintains safe operation by selectively controlling water flow rates and temperatures, thereby improving overall system performance.
Implementation Method 1
incorporating a heat recovery chiller to reuse heat energy
Implementation Method 2
optimize heat transfer and reduce energy consumption
Data Source
AI summary
A water distribution apparatus and method including cold and hot water supplies, a fan coil (or chilled beam device), a control valve having cold and hot water inlets and outlets, cold and hot water outputs configured to supply cold and hot water to the fan coil, cold and hot water return inlets configured to receive from the fan coil the water supplied by the cold and/or water outputs and outputting the cold and/or hot water to the cold and hot water supply lines, respectively, via the cold and hot water outlets, respectively. Cold and hot water is supplied from the cold and/or hot water outputs to the fan coil and received into the cold and hot water return inlets, respectively, and the cold and hot water supplied by the cold and hot water outputs to the fan coil is output to the cold and hot water supply lines, respectively.