Two-Pipe Water-Based Air Conditioning Using Changeover Box Control
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Solution Overview
Problem
Conventional water-based air conditioning systems are complex, costly, and difficult to install due to the need for multiple components and four-pipe configurations, which also raises health and safety concerns with flammable refrigerants in Variable Refrigerant Flow (VRF) systems.
Innovation Solution
A simplified air conditioning system using a changeover box that converts a four-pipe system into a two-pipe system with a single hot water loop and a single cold water loop, integrating a heater unit, chiller unit, and air-to-water heat exchangers with control valves and a changeover box controller for efficient heating and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional water-based air conditioning system is used, then heating and cooling functions are provided, but the system complexity and installation difficulty increase due to requiring four pipes and multiple separate components
Solution Approach 1:
The patent combines multiple separate components (heater unit, chiller unit, control valves, and piping) into a single integrated air conditioning unit. This merging eliminates the need for four separate pipes and multiple independent components, reducing installation complexity while maintaining both heating and cooling functions through a unified two-pipe system.
Solution Approach 2:
The air conditioning unit is designed as a universal system that can provide both heating and cooling functions through a single integrated device. The unit can switch between heating mode (providing hot water flow) and cooling mode (providing cold water flow) to serve multiple purposes, eliminating the need for separate heating and cooling systems.
2Adaptability or versatility
If VRF/VRV systems with flammable refrigerant gases are used, then air conditioning functionality is achieved, but health and safety risks increase
Solution Approach 1:
The patent replaces expensive and hazardous refrigerant gases with water as the working fluid. Water is non-flammable, environmentally friendly, and eliminates health and safety risks associated with refrigerant leaks. The system uses water-based heat exchange instead of refrigerant-based cycles, maintaining cooling functionality without the harmful effects of flammable gases.
Solution Approach 2:
The system creates a safe operating environment by using water, an inert and non-flammable substance, instead of flammable refrigerant gases. This eliminates the hazard of combustion and health risks from refrigerant exposure, while the water-based heat exchange mechanism effectively provides the required air conditioning functionality.
3Ease of manufacture
If separate companies supply boilers, chillers, fan coil units, and controls, then specialized components are provided, but system integration complexity and costs increase
Solution Approach 1:
The patent integrates functions that were previously supplied by separate companies (heating, cooling, control valves, and piping) into a single manufactured unit. This consolidation simplifies the supply chain and installation process while maintaining the specialized functionalities of each component within the integrated design.
4Adaptability or versatility
If a four-pipe system is used for water-based air conditioning, then simultaneous heating and cooling is enabled, but installation costs and complexity increase
Solution Approach 1:
The patent merges the four-pipe configuration into a two-pipe system by integrating the heating and cooling functions within a single unit. The integrated design allows the unit to switch between providing hot water flow and cold water flow through the same two pipes, eliminating the need for separate hot and cold supply and return pipes while maintaining simultaneous heating and cooling capability.
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 simplifies installation, reduces costs, and enhances safety by using a single point of control and supply, allowing for flexible integration with existing systems and energy-efficient operation in both heating and cooling modes.
Implementation Method 1
one or more air to water heat exchangers
Implementation Method 2
one or more control valves, each control valve associated with one of the air to water heat exchangers and arranged to: receive the hot water flow and cold water flow; selectively provide the flow from a one of the hot water loop or cold water loop to the air to water heat exchanger
Data Source
AI summary
An air conditioning system (1) has a heater unit (3) providing a hot water flow (7) and receiving a hot water return (31) in hot water loop, a chiller unit (5) providing a cold water flow (13) and receiving a cold water return (33) in a cold water loop, one or more air to water heat exchangers (17), and one or more control valves (11), each control valve (11) associated with one of the air to water heat exchangers (17) and arranged to receive the hot water flow (7) and cold water flow (13), selectively provide the flow from a one of the hot water loop or cold water loop to the associated air to water heat exchanger (17), receive a return from the associated air to water heat exchanger (17), and selectively provide the return from the associated air to water heat exchanger (17) to the return of the one of the hot water loop or cold water loop.