Water-Based Control Valve System 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 undetectable nature exacerbates the severity of leaks, necessitating a safer alternative that uses water for improved efficiency and reduced risk.
Innovation Solution
A valve system and method for controlling water distribution in heating, ventilation, air conditioning, refrigeration, and chilling systems, incorporating a control valve with cold and hot water inlets, outlets, and return lines, along with thermostats and pumps, to optimize heat transfer and reduce energy consumption by utilizing a heat recovery chiller to loop heat energy between cold and hot water circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional direct expansion systems use refrigerant for heating and cooling, then cooling and heating functions are provided, but safety risks arise from refrigerant leaks that can displace oxygen and cause suffocation
Solution Approach 1:
The patent introduces water as an intermediary fluid to transfer heat between the indoor and outdoor environments, replacing refrigerant in the heat exchangers located in occupied spaces. This mediator (water) eliminates the direct harmful effect of refrigerant leakage into living spaces while maintaining the heat transfer function through a safe alternative substance.
2Productivity
If refrigerant is used in heat exchangers within occupied spaces, then heating and cooling efficiency is achieved, but the undetectable nature of refrigerant gas exacerbates the severity of leaks
Solution Approach 1:
Water serves as a detectable and safe intermediary that maintains thermal exchange efficiency without the hidden dangers of refrigerant. The system preserves productivity by using water-based heat exchangers that can be monitored and detected if leaks occur, eliminating the undetectable nature of refrigerant gas while maintaining heating and cooling performance.
3Reliability
If water is used instead of refrigerant in heat exchangers, then safety risks from refrigerant leaks are reduced, but system complexity increases due to additional components needed for water distribution and control
Solution Approach 1:
The control valve assembly performs multiple functions within a single integrated component: it distributes water to multiple heat exchangers, controls flow direction, regulates water temperature, and enables system configuration changes. This multi-functionality reduces the number of separate components needed, thereby managing system complexity while maintaining safety benefits.
Solution Approach 2:
The patent combines the control valve, flow distribution channels, and temperature regulation mechanisms into a single integrated control valve assembly. This merging of functions into one component reduces the overall number of parts and simplifies the water distribution system architecture, offsetting the inherent complexity of using water instead of refrigerant.
4Ease of operation
If water distribution systems with multiple control valves are used, then precise temperature and flow control is achieved, but device complexity and potential failure points increase
Solution Approach 1:
Each control valve assembly is designed as a universal unit that can handle multiple functions: distributing water to different heat exchangers, controlling flow rates, regulating temperature, and adapting to different system configurations. This multi-functionality allows precise control while reducing the need for multiple specialized valves, thereby managing complexity.
Solution Approach 2:
The water distribution system is segmented into modular control valve assemblies that can be independently controlled and maintained. Each assembly serves a specific zone or heat exchanger but functions as a complete, self-contained unit with integrated control mechanisms. This segmentation allows for precise local control while simplifying overall system management through standardized modular 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 non-toxic water and enhances energy efficiency by recycling heat energy between water loops, potentially lowering overall energy consumption and maintaining safe operating conditions.
Implementation Method 1
utilizing a heat recovery chiller to loop heat energy between cold and hot water circuits
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.