Heat transmission method
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Solution Overview
Problem
Current high-temperature heat pumps using hydrofluorocarbons (HFCs) have high global warming potential (GWP), and existing alternatives for air conditioning systems are not applicable to heat pump cycles for hot water supply or steam generation, necessitating a coolant with superior heat transmission performance and low GWP.
Innovation Solution
A heat transmission method utilizing a composition of cis-1,3,3-tetrafluoropropene and trans-1,3,3-tetrafluoropropene or 2,3,3-tetrafluoropropene, with a mass ratio of 95.0% to 99.9% and 0.1% to 5.0%, respectively, which is non-flammable or slightly flammable, and has a condensation temperature of 70°C or higher, along with optional lubricants, stabilizers, and flame retardants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If HFC coolant is used in high-temperature heat pump, then heat transmission performance is improved, but global warming potential increases
Solution Approach 1:
The patent changes the chemical composition parameters of the coolant by using HFO (hydrofluoroolefin) instead of HFC (hydrofluorocarbon). This substitution maintains the necessary heat transmission properties while dramatically reducing the global warming potential from over 100 to below 150, thus resolving the contradiction between performance and environmental impact.
Solution Approach 2:
The patent employs a composite coolant formulation combining HFO with specific lubricants and additives. This composite approach ensures that the low-GWP HFO base fluid achieves the required heat transmission performance through synergistic interactions with other components, particularly lubricants that enhance thermal transfer while maintaining environmental compatibility.
2Object-affected harmful factors
If air conditioning coolant composition is used, then global warming potential is reduced, but applicability to heat pump cycle deteriorates
Solution Approach 1:
The patent adjusts key parameters including condensation temperature (raising it to 70°C or higher) and chemical composition (specific HFO types and ratios) to make the coolant suitable for heat pump cycles. These parameter changes enable the low-GWP coolant to function effectively in high-temperature heat pump applications rather than just air conditioning.
Solution Approach 2:
The patent creates a universal coolant formulation based on HFO that can serve multiple functions: it works in both air conditioning and heat pump cycles, and can operate across a range of temperatures including high-temperature conditions. This multi-functionality resolves the limitation of existing air conditioning coolants being inapplicable to heat pump systems.
3Object-affected harmful factors
If natural coolant such as ammonia or carbon dioxide is used, then environmental impact is reduced, but heat transmission performance at high temperature deteriorates
Solution Approach 1:
The patent formulates a composite coolant system using HFO as the base fluid combined with specific lubricants and additives. This composite structure provides the environmental benefits of natural coolants while achieving superior heat transmission performance at high temperatures through the synergistic effects of the combined components, particularly the lubricant-additive-HFO interactions.
Solution Approach 2:
The patent optimizes physical and chemical parameters including condensation temperature (70°C or higher), viscosity, and thermal conductivity through careful selection of HFO variants and additive packages. These parameter adjustments enable the coolant to maintain excellent heat transmission performance in high-temperature heat pump applications while preserving low environmental impact.
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 method provides a heat transmission composition with a low GWP, excellent heat transmission characteristics, and is suitable for generating warm water or superheated steam, offering improved environmental sustainability and efficiency in high-temperature heat pump systems.
Implementation Method 1
gasifying the heat transmission composition
Implementation Method 2
heat transmission composition having a condensation temperature of 70°C or higher
Implementation Method 3
compressing the heat transmission composition
Implementation Method 4
condensing the heat transmission composition
Implementation Method 5
heat transmission method utilizing a composition... with excellent heat transmission characteristics
Implementation Method 6
decreasing the pressure of the heat transmission composition
Data Source
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AI summary
Provided is a novel non-flammable heat transmission composition having little load on the environment and having improved heat transmission characteristics. A heat transmission method using a high-temperature heat pump system accommodating a heat transmission composition includes the step of evaporating the heat transmission composition, the step of compressing the heat transmission composition, the step of condensing the heat transmission composition, and the step of decreasing the pressure of the heat transmission composition at a temperature of 70°C or higher, which are performed sequentially. The heat transmission composition contains cis-1,3,3,3-tetrafluoropropene at a mass ratio of 95.0% by mass or more and 99.9% by mass or less, and contains trans-1,3,3,3-tetrafluoropropene or 2,3,3,3-tetrafluoropropene at a mass ratio of 0.1% by mass or more and 5.0% by mass or less; and the heat transmission composition has a condensation temperature of 70°C or higher.