Multi-Indoor AC Evaporating Temperature Control for Humidity Balance
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Solution Overview
Problem
In air-conditioning systems with multiple indoor units connected to an outdoor unit, the uniform control of evaporating temperature leads to excessive cooling and dehumidification, especially when load differences exist among units, resulting in inefficient energy use and reduced comfort.
Innovation Solution
An air-conditioning system with a control mechanism that adjusts the target evaporating temperature based on temperature and humidity sensors' data, allowing for thermo-ON/OFF operations of indoor units and conveying fans to optimize cooling and dehumidification according to the specific needs of each space, ensuring energy efficiency and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper limit evaporating temperature is set to ensure a predetermined amount of dehumidification, then dehumidification performance is improved, but excessive dehumidification occurs and comfort deteriorates
Solution Approach 1:
The patent applies dynamics by making the upper limit evaporating temperature adjustable rather than fixed. The control means dynamically resets the upper limit evaporating temperature based on real-time detection of whether both thermo-ON and thermo-OFF indoor units are operating. When both states coexist, the system resets the temperature limit to prevent excessive dehumidification, thereby adapting to changing operational conditions to maintain comfort while ensuring adequate dehumidification performance.
Solution Approach 2:
The patent changes the parameter of evaporating temperature based on operational conditions. By detecting the coexistence of thermo-ON and thermo-OFF indoor units, the system modifies the upper limit evaporating temperature parameter to prevent excessive dehumidification. This parameter adjustment allows the system to maintain reliable dehumidification when needed while avoiding over-dehumidification that would compromise comfort.
2Reliability
If the upper limit evaporating temperature is set to ensure a predetermined amount of dehumidification, then dehumidification performance is improved, but energy consumption increases due to excessive air-conditioning
Solution Approach 1:
The system dynamically adjusts the upper limit evaporating temperature based on the operational state of indoor units. When both thermo-ON and thermo-OFF units are detected, the control means resets the temperature limit to prevent unnecessary air-conditioning operation. This dynamic adjustment ensures that dehumidification performance is maintained when required while avoiding excessive energy consumption from unnecessary cooling operations.
Solution Approach 2:
The control system automatically detects the operational states of indoor units and self-adjusts the upper limit evaporating temperature without external intervention. When both thermo-ON and thermo-OFF units coexist, the system autonomously resets the temperature parameter to optimize the balance between dehumidification performance and energy consumption, eliminating the need for manual parameter adjustment.
3Device complexity
If uniform evaporating temperature control is applied to all indoor units, then system simplicity is maintained, but excessive cooling occurs at units with small load
Solution Approach 1:
The patent implements feedback control by detecting the operational states (thermo-ON/thermo-OFF) of individual indoor units and using this information to adjust the upper limit evaporating temperature. When both thermo-ON and thermo-OFF units are detected, the system provides feedback by resetting the temperature limit to prevent excessive cooling at units with small load, thereby reducing energy loss while maintaining relatively simple control logic.
4Ease of operation
If indoor units operate without considering individual load requirements, then operational simplicity is maintained, but cooling becomes excessive and comfort deteriorates
Solution Approach 1:
The control means incorporates feedback by automatically detecting whether both thermo-ON and thermo-OFF indoor units are operating simultaneously. Based on this detection, the system automatically resets the upper limit evaporating temperature to prevent excessive cooling at units with small load. This feedback mechanism maintains ease of operation by eliminating the need for manual intervention while effectively preventing harmful excessive cooling that would deteriorate comfort.
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 prevents excessive air-conditioning, reduces energy consumption, and enhances comfort by dynamically adjusting the air-conditioning capacity to match the specific requirements of each indoor unit, thereby improving overall energy savings and user comfort.
Implementation Method 1
an evaporating temperature of a refrigerant at which at least a predetermined amount of dehumidification is obtained at an indoor heat exchanger
Implementation Method 2
a conveying fan conveying conditioned air
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An air-conditioning system A includes: an air-conditioning apparatus B in which indoor units 6a and 6b are connected to an outdoor unit 1; a conveying fan 14; and control means 12 for controlling the air-conditioning apparatus B and the conveying fan 14 on the basis of a target evaporating temperature. The control means 12 resets an upper limit of the target evaporating temperature when: a control determination temperature difference which is a difference between a set temperature and a temperature of an air-conditioned space 5 is within a predetermined range; a humidity of the air-conditioned space 5 is equal to or lower than a predetermined value; and a thermo-ON indoor unit and a thermo-OFF indoor unit are present together in the same air-conditioned space 5.