Air-conditioning apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air-conditioning apparatuses using non-azeotropic refrigerant mixtures face challenges in accurately calculating evaporating and dew-point temperatures, leading to performance degradation and increased costs due to the need for additional detection means and components like double-pipe heat exchangers and pressure detection systems.
Innovation Solution
An air-conditioning apparatus with a refrigeration cycle using a non-azeotropic refrigerant mixture, equipped with temperature sensors on the inlet and outlet sides of the expansion device, calculates evaporating and dew-point temperatures based on the quality of the refrigerant, inlet liquid enthalpy, and saturated gas and liquid enthalpies, allowing for accurate control of the refrigeration cycle without the need for costly pressure detection systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure detection means and double-pipe heat exchangers are added to accurately detect refrigerant composition, then measurement precision improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the pressure detection function from the system by calculating refrigerant composition based solely on temperature measurements. By removing the pressure detection means and double-pipe heat exchanger components, the invention achieves composition detection through temperature data alone, thereby reducing device complexity while maintaining measurement capability.
Solution Approach 2:
The patent creates a computational model that copies the function of pressure detection through temperature-based calculations. By using thermodynamic relationships and temperature measurements at different points in the refrigeration cycle, the system replicates composition detection accuracy without physical pressure sensors.
2Ease of manufacture
If temperature sensors and calculation methods are used instead of pressure detection systems, then manufacturing cost decreases, but measurement precision may deteriorate
Solution Approach 1:
The patent changes the measurement parameter from pressure to temperature. By measuring temperature at multiple points (evaporator inlet/outlet, condenser inlet/outlet) and using thermodynamic calculations, the system determines refrigerant composition without pressure sensors, reducing manufacturing cost while maintaining accuracy through parameter substitution.
Solution Approach 2:
The patent replaces the mechanical pressure detection system with a thermal measurement and calculation system. Instead of using pressure sensors and double-pipe heat exchangers, the invention uses temperature sensors combined with thermodynamic models to detect refrigerant composition, substituting mechanical components with thermal-field-based solutions.
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
This solution enables accurate calculation of evaporating and dew-point temperatures using temperature sensors, reducing costs and ensuring stable performance by eliminating the need for expensive pressure detection systems while maintaining precise control over the refrigeration cycle.
Implementation Method 1
first temperature detection means disposed on an inlet side of the expansion device, and second temperature detection means disposed on an outlet side of the expansion device
Implementation Method 2
A refrigerant that circulates in a refrigerant circuit of the air-conditioning apparatus transfers heat to (or receives heat from) air supplied to a heat exchanger of the indoor unit so as to heat or cool the air
Implementation Method 3
expansion device, and a second heat exchanger are connected by pipes to form a refrigeration cycle, and a non-azeotropic refrigerant mixture is adopted as a refrigerant circulating in the refrigeration cycle
Data Source
AI summary
A computing device calculates an evaporating temperature Te* and a dew-point temperature Tdew* from a quality X, a temperature glide ΔT determined by a difference between a boiling temperature and a dew-point temperature at a predetermined pressure, and a refrigerant temperature detected by second temperature detection device.