Liquid Chiller Refrigerant Replacement With R-1233 for Lower GWP
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Solution Overview
Problem
There is a growing need for environmentally sustainable refrigerants with lower ozone depleting and global warming potentials to replace chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs, as they are being phased out, and while hydrofluorocarbons (HFCs) are a replacement, they still have high global warming potentials, necessitating the identification of alternatives like halogenated olefins for use in liquid chiller systems.
Innovation Solution
Chloro-trifluoropropenes, particularly 1-chloro-3,3,3-trifluoropropene, are used as refrigerants in liquid chiller systems, including negative-pressure systems, offering high efficiency and capacity, and are compatible with current chiller lubricants, allowing for their use in new or retrofitted systems without the need for additional surfactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC refrigerants are used to replace CFCs and HCFCs, then ozone depletion is reduced, but global warming potential remains high
Solution Approach 1:
The invention changes the chemical composition parameters of the refrigerant by using hydrochlorofluoroolefin (HCFO) compounds with specific molecular structures that achieve near-zero ozone depletion potential while maintaining lower global warming potential compared to HFCs, as evidenced by the GWP values of 64-124 for HCFOs versus 143-253 for comparable HFCs
Solution Approach 2:
The invention employs composite refrigerant formulations combining HCFO compounds with other refrigerant components (such as HFC-134a, HFC-125, or hydrocarbons) to achieve optimal balance between environmental performance and refrigeration effectiveness, allowing customization of the blend ratios to meet specific application requirements
2Object-affected harmful factors
If new refrigerant compounds are introduced to replace existing refrigerants, then environmental sustainability is improved, but system compatibility and performance may deteriorate
Solution Approach 1:
The invention uses lubricant compatibility as an intermediary factor to ensure system reliability, specifically selecting HCFO compounds that maintain compatibility with mineral oil and other common refrigerant lubricants, thereby avoiding the need for complete system overhaul while achieving refrigerant replacement
Solution Approach 2:
The invention adjusts physical and chemical parameters of the refrigerant compounds (molecular weight, boiling point, pressure characteristics) to match the operating parameters of existing chiller systems, ensuring that the new refrigerants can be used in both new and retrofitted applications without compromising system performance
3Productivity
If refrigerant capacity is increased to meet cooling demands, then productivity is improved, but environmental impact may worsen due to higher charge amounts
Solution Approach 1:
The invention changes the thermodynamic parameters of the refrigerant (enthalpy of vaporization, specific heat capacity, density) through molecular structure optimization of HCFO compounds, achieving higher refrigeration capacity per unit mass and volume, which allows for reduced total charge amounts while maintaining or improving cooling performance
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
Chloro-trifluoropropenes provide operating conditions comparable to current refrigerants, maintain compressor performance, and offer a significant increase in refrigeration capacity while reducing environmental impact, making them a suitable replacement for R-11 and R-123 in liquid chiller systems.
Implementation Method 1
Chillers are refrigeration machines that cool water, other heat transfer fluids, or process fluids by a vapor-compression (modified reverse-Rankine), absorption, or other thermodynamic cycle
Implementation Method 2
The refrigerant vaporizes and is drawn into the compressor, which increases the pressure and temperature of the gas so that it may be condensed at the higher temperature in the condenser
Implementation Method 3
The condenser cooling medium is warmed in the process. The condensed liquid refrigerant then flows back to the evaporator through an expansion device
Data Source
AI summary
This invention relates to the use of chloro-trifluoropropenes as refrigerants in negative-pressure liquid chillers and methods of replacing an existing refrigerant in a chiller with chloro-trifluoropropenes. The chloro-trifluoropropenes, particularly 1-chloro-3,3,3-trifluoropropene, have high efficiency and unexpectedly high capacity in liquid chiller applications and are useful as more environmentally sustainable refrigerants for such applications, including the replacement of R-123 and R-11.