Air Conditioner Dew Point Control for Wind-Free Cooling Operation
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Solution Overview
Problem
Dew formation on discharge portions of integrated air conditioners can lead to product damage and contamination due to mold and dust, especially during wind-free cooling operations.
Innovation Solution
An air conditioner system that includes sensors for detecting indoor and outdoor temperatures and humidity, determining a dew point temperature, and adjusting discharge air temperature to prevent dew formation by increasing the temperature and contact area of the discharge air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the discharge blade is closed during wind-free cooling operation, then energy efficiency is improved, but dew formation occurs on the discharge portion and front panel
Solution Approach 1:
The system changes the temperature parameter of the discharge air by adjusting the refrigerant flow rate and compressor operation. By maintaining the discharge air temperature above the dew point temperature, the system prevents dew formation while keeping the discharge blade closed for energy efficiency.
Solution Approach 2:
The system uses feedback control by continuously monitoring indoor temperature and humidity to calculate the dew point temperature, then adjusts the refrigerant flow rate and compressor operation to maintain discharge air temperature above this calculated dew point, preventing dew formation while maintaining energy efficiency.
2Object-affected harmful factors
If the discharge air temperature is increased to prevent dew formation, then dew prevention is improved, but energy consumption increases
Solution Approach 1:
The system optimizes the refrigerant flow rate parameter to achieve the minimum necessary discharge air temperature that prevents dew formation. By precisely controlling the refrigerant flow rate rather than simply increasing it, the system prevents dew while minimizing energy consumption.
Solution Approach 2:
The system dynamically adjusts the refrigerant flow rate and compressor operation based on real-time indoor temperature and humidity conditions. This dynamic control ensures the discharge air temperature is maintained just above the dew point, preventing dew formation while avoiding excessive energy consumption.
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
Effectively reduces dew formation, preventing product damage and contamination by actively managing discharge air conditions to maintain optimal temperature and humidity levels.
Implementation Method 1
an indoor heat exchanger; an indoor temperature sensor configured to detect an indoor temperature
Implementation Method 2
A refrigerant may circulate along the pipes through the compressor, the condenser, the expansion device, and the evaporator
Data Source
AI summary
An air conditioner may include: a compressor, an indoor heat exchanger; an indoor temperature sensor configured to detect an indoor temperature; an outdoor temperature sensor configured to detect an outdoor temperature; an indoor humidity sensor configured to detect an indoor humidity; a heat exchanger temperature sensor configured to detect a temperature of the indoor heat exchanger; and a controller, comprising circuitry, configured to determine a dew point temperature based on the detected indoor temperature and the detected indoor humidity, determine a temperature of discharge air based on the determined dew point temperature, the detected temperature of the indoor heat exchanger, and the outdoor temperature, and determine whether to perform an anti-dew protection operation based on the determined dew point temperature and the temperature of the discharge air.