Air-Conditioner Control Using Heat Exchange and Refrigerant State
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Solution Overview
Problem
Conventional air-conditioning operation control apparatuses do not fully optimize operating efficiency and energy conservation, as they only consider temperature differences between room and set temperatures, neglecting factors like air flow rate, degree of superheat, and degree of subcooling.
Innovation Solution
An operation control apparatus that calculates required evaporation or condensation temperatures based on current and greater amounts of heat exchanged, considering air flow rates and degrees of superheat or subcooling, to optimize the capability of the usage-side heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If required capabilities are calculated based only on temperature difference between room temperature and set temperature, then the control system is simple, but operating efficiency is not optimized and energy is not conserved
Solution Approach 1:
The patent changes the parameters used for calculating required capabilities from only temperature difference to multiple parameters including air flow rate, degree of superheat, and degree of subcooling. This allows the system to determine more accurate target evaporation and condensation temperatures, optimizing heat exchanger performance and reducing energy consumption while maintaining reasonable control complexity.
2Productivity
If multiple operating state amounts are considered for calculating required temperatures, then operating efficiency is improved, but calculation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing the relationship between operating state amounts (air flow rate, degree of superheat, degree of subcooling) and heat exchange capability in a database. During operation, the system retrieves and calculates required temperatures based on current operating conditions using these pre-established relationships, avoiding complex real-time simulations while achieving optimized operating efficiency.
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 approach improves operating efficiency and energy conservation by determining optimal operating states for indoor units, ensuring better heat exchange capabilities and minimizing energy usage.
Implementation Method 1
an indoor unit having a usage-side heat exchanger
Implementation Method 2
heat exchanged in the usage-side heat exchanger
Implementation Method 3
required evaporation temperature
Implementation Method 4
required condensation temperature
Implementation Method 5
an air blower capable of adjusting an air flow rate within a predetermined air flow rate range
Data Source
AI summary
An operation control apparatus of air-conditioning apparatus having an outdoor unit and an indoor unit includes a controller programmed to execute energy conservation control of the air conditioning apparatus. The controller includes at least one required temperature calculation part calculating a required evaporation temperature or a required condensation temperature based on either a current amount of heat exchanged in a usage-side heat exchanger of the indoor unit and a greater amount of heat exchanged in the usage-side heat exchanger than the current amount, or an operating state amount that yields the current amount of heat exchanged in the usage-side heat exchanger and an operating state amount that yields the greater amount of heat exchanged in the usage-side heat exchanger than the current amount.