Chiller Refrigerant Blend for Low-GWP HFC-134a Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current refrigerants, such as HCFCs and HFCs, have environmental concerns due to ozone depletion potential and global warming contributions, necessitating the development of alternatives with zero ozone depletion potential and lower global warming potential for use in chillers, particularly as replacements for HFC-134a and CFC-12.
Innovation Solution
Compositions comprising 2,3,3-tetrafluoropropene and 1,1,1,2-tetrafluoroethane, which are azeotropic or azeotrope-like, offering high energy efficiency and cooling capacity while having low global warming potential and zero ozone depletion potential, are used as working fluids in chillers, providing a non-flammable and efficient refrigerant solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HCFCs and HFCs are used as refrigerants, then cooling capacity and energy efficiency are maintained, but ozone depletion potential and global warming contribution increase
Solution Approach 1:
The patent changes the chemical composition parameters by using unsaturated fluorocarbons (specifically 2,3,3,3-tetrafluoropropene) as refrigerants, which have zero ozone depletion potential while maintaining the required cooling capacity and energy efficiency for chiller applications
Solution Approach 2:
The patent employs composite refrigerant formulations combining unsaturated fluorocarbons with other compatible refrigerants to achieve both environmental compliance (zero ODP) and optimal thermodynamic performance for replacement in existing chiller systems
2Productivity
If HCFCs and HFCs are used as refrigerants, then cooling capacity and energy efficiency are maintained, but global warming potential increases
Solution Approach 1:
The patent transitions to refrigerants with significantly lower global warming potential by using unsaturated fluorocarbons, which maintain high energy efficiency and cooling capacity while reducing environmental impact compared to conventional HFCs
3Object-affected harmful factors
If replacement refrigerants are sought, then environmental impact is reduced, but properties must closely match original working fluids for existing equipment
Solution Approach 1:
The patent carefully selects and formulates unsaturated fluorocarbon-based refrigerants whose thermodynamic properties (pressure-temperature relationships, heat transfer characteristics) closely match those of conventional HFC-134a and CFC-12, enabling drop-in replacement in existing chiller equipment without system modifications
Solution Approach 2:
The patent develops universal refrigerant compositions that can serve multiple functions: they work as drop-in replacements in existing equipment, provide high energy efficiency, achieve zero ozone depletion potential, and maintain compatibility with various lubricants and system materials
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
These compositions enhance the volumetric cooling capacity and energy efficiency of chillers, offering a viable replacement for existing refrigerants with minimal environmental impact, maintaining optimal performance in both evaporators and condensers, and are suitable for existing and new chiller designs.
Implementation Method 1
an evaporator having a heat transfer medium passing therethrough thereby producing a vapor refrigerant
Implementation Method 2
evaporating a liquid refrigerant comprising from about 6 to about 70 weight percent 2,3,3,3-tetrafluoropropene and from about 30 to about 94 weight percent 1,1,1,2-tetrafluoroethane in an evaporator
Implementation Method 3
evaporating a liquid refrigerant... thereby producing a vapor refrigerant
Implementation Method 4
compressing the vapor refrigerant in a centrifugal compressor
Data Source
AI summary
Disclosed herein is a chiller apparatus containing a composition comprising from about 6 to about 70 weight percent 2,3,3,3-tetrafluoropropene and from about 30 to about 94 weight percent 1,1,1,2-tetrafluoroethane. Also disclosed herein is a method for producing cooling in a chiller comprising (a) evaporating a liquid refrigerant comprising from about 6 to 70 weight percent 2,3,3,3-tetrafluoropropene and from about 30 to 94 weight percent 1,1,1,2-tetrafluoroethane in an evaporator having a heat transfer medium passing therethrough thereby producing a vapor refrigerant; and (b) compressing the vapor refrigerant in a compressor. Also disclosed herein is a method for replacing a refrigerant in a chiller designed for using HFC-134a or CFC-12 as refrigerant, comprising charging said chiller with a composition comprising a refrigerant consisting essentially of from about 6 to 70 weight percent 2,3,3,3-tetrafluoropropene and from about 30 to 94 weight percent 1,1,1,2-tetrafluoroethane.