Single-stage carbon dioxide multi-split cooling and heating multifunctional central air conditioner
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Solution Overview
Problem
Conventional multi-split central air conditioners using freon as a refrigerant face issues such as high costs, inconvenient installation, high maintenance costs, limited usage due to high viscosity, poor low-temperature heating efficiency, environmental unfriendliness, and high freon prices.
Innovation Solution
A single-stage carbon dioxide multi-split cooling and heating multifunctional central air conditioner that uses carbon dioxide as the circulating working medium, featuring a simple structure, high efficiency, low cost, and environmental friendliness, with a large number of end heat exchangers driven due to carbon dioxide's low density, low viscosity, and large pressure difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If freon is used as refrigerant in traditional multi-split central air conditioner, then the system can operate with conventional refrigeration cycle, but the number of end heat exchangers is limited and outdoor units must be increased resulting in higher costs and inconvenient installation
Solution Approach 1:
The patent changes the refrigerant from freon to carbon dioxide, fundamentally altering the fluid properties (density, viscosity, pressure difference) to enable a single outdoor unit to drive many more end heat exchangers efficiently
Solution Approach 2:
The single outdoor unit is designed to serve multiple end heat exchangers simultaneously, making the outdoor unit more universal and reducing the total number of outdoor units needed in the system
2Length of stationary object
If freon is used as refrigerant, then the refrigeration cycle can be maintained, but high viscosity limits piping distance and requires small drop between indoor and outdoor units
Solution Approach 1:
The patent changes the refrigerant properties by using carbon dioxide instead of freon, achieving lower viscosity and larger pressure difference, which enables longer piping distances and greater flexibility in installation
3Temperature
If traditional multi-split air conditioner is used for heating in low temperature environment, then heating function is provided, but thermal efficiency decreases seriously when ambient temperature is lower than -5 degrees Celsius
Solution Approach 1:
The patent changes the refrigerant to carbon dioxide, which maintains better thermodynamic performance at low temperatures, allowing the system to operate efficiently as a heat pump even when ambient temperature is below -5 degrees Celsius without requiring auxiliary electric heaters
4Ease of manufacture
If freon is used as refrigerant, then the refrigeration system can function, but the price is high and maintenance costs are relatively high
Solution Approach 1:
The patent replaces expensive freon refrigerant with carbon dioxide, which is much cheaper and more readily available, significantly reducing both initial system cost and ongoing maintenance expenses
5Object-affected harmful factors
If freon is used as refrigerant, then the refrigeration cycle operates normally, but freon discharge into atmosphere causes ozone depletion and greenhouse effect
Solution Approach 1:
The patent replaces harmful freon refrigerant with carbon dioxide, which is environmentally benign and does not deplete ozone or contribute to greenhouse effect, thereby converting a harmful substance into a safe one for atmospheric discharge
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 achieves increased efficiency by more than twice and energy savings of over 50% compared to conventional air conditioners, with the ability to operate in high-rise buildings and provide multiple functions such as hot water supply, ice storage, floor heating, and fire extinguishing using carbon dioxide.
Implementation Method 1
cooling and/or heating are performed by carbon dioxide medium circulating in a carbon dioxide compressor, an outdoor heat exchanger, a liquid storage tank, and the multiple end heat exchangers
Implementation Method 2
cooling and/or heating are performed by carbon dioxide medium circulating in a carbon dioxide compressor, an outdoor heat exchanger, a liquid storage tank, and the multiple end heat exchangers
Data Source
AI summary
A single-stage carbon dioxide multi-split cooling and heating multifunctional central air conditioner, comprising a single-stage carbon dioxide circulation system using carbon dioxide as a circulation working medium; the single-stage carbon dioxide circulation system comprises an outdoor unit and a plurality of end heat exchangers provided in parallel; and the carbon dioxide medium performs cooling and/or heating in a circulating manner in a carbon dioxide compressor, an outdoor heat exchanger, a liquid storage tank and the end heat exchangers which are in communication with one another.