Dual Refrigerant Circuit Evaporation Control for Humidity Loads
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Solution Overview
Problem
Existing air-conditioning systems face inefficiencies in energy consumption due to constant low evaporating temperatures, leading to reduced comfort from inadequate latent heat processing, especially when outdoor air humidity is high or low, resulting in either comfort reduction or increased power consumption.
Innovation Solution
An air-conditioning system with two refrigerant circuits, one controlling evaporating temperature based on outdoor air temperature and the other on humidity, allowing for dynamic adjustment of evaporating temperatures to balance sensible and latent heat loads, enhancing energy-saving performance while maintaining comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the evaporating temperature is kept at a constant low temperature to process latent heat load, then the latent heat processing capability is improved, but the power consumption increases and operation efficiency decreases
Solution Approach 1:
The patent applies dynamics by transitioning from constant evaporating temperature control to dynamic evaporating temperature control. The evaporating temperature is adjusted in real-time based on outdoor air conditions (temperature and humidity) and indoor load requirements, allowing the system to optimize between latent heat processing and energy consumption rather than maintaining a fixed low temperature
Solution Approach 2:
The patent changes the operating parameters by adjusting the evaporating temperature based on outdoor air humidity and temperature conditions. When outdoor humidity is high, the evaporating temperature is lowered to enhance latent heat processing; when outdoor humidity is low, the evaporating temperature is raised to reduce power consumption, thus dynamically optimizing system performance
2Use of energy by moving object
If the evaporating temperature is increased to reduce power consumption, then the operation efficiency is improved, but the latent heat processing becomes insufficient causing indoor humidity to increase
Solution Approach 1:
The patent implements feedback control by continuously monitoring outdoor air humidity and temperature, indoor air conditions, and compressor operating parameters. This feedback information is used to dynamically adjust the evaporating temperature, ensuring that latent heat processing requirements are met while optimizing energy consumption based on actual environmental conditions
3Reliability
If the evaporating temperature is controlled based only on indoor humidity without considering outdoor air load, then the indoor comfort is maintained, but the energy-saving performance decreases when outdoor air humidity is low
Solution Approach 1:
The patent applies preliminary action by using outdoor air temperature and humidity data to predict and prepare for latent heat processing requirements before the cooling cycle fully engages. The evaporating temperature is pre-adjusted based on outdoor conditions, allowing the system to respond more efficiently to latent heat loads and reduce overall 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
The system effectively processes both sensible and latent heat loads by adjusting evaporating temperatures according to outdoor conditions, reducing energy consumption and maintaining comfortable indoor conditions.
Implementation Method 1
The refrigerant which has flowed into the outdoor heat exchanger radiates heat to air and thus liquefies. In the indoor heat exchanger, the refrigerant removes heat from ambient air and thus gasifies.
Implementation Method 2
The refrigerant is compressed into high-temperature high-pressure gas refrigerant by the compressor and is then delivered to the outdoor heat exchanger. The refrigerant which has flowed into the outdoor heat exchanger radiates heat to air and thus liquefies. The liquefied refrigerant is subjected to pressure reduction into a two-phase gas-liquid state by the expansion unit. In the indoor heat exchanger, the refrigerant removes heat from ambient air and thus gasifies.
Implementation Method 3
the refrigerant is compressed into high-temperature high-pressure gas refrigerant by the compressor
Implementation Method 4
The refrigerant which has flowed into the outdoor heat exchanger radiates heat to air and thus liquefies.
Implementation Method 5
The refrigerant which has flowed into the outdoor heat exchanger radiates heat to air and thus liquefies.
Data Source
AI summary
An air-conditioning system is configured to determine an evaporating temperature control range of a first refrigerant circuit on the basis of the temperature of outdoor air, control an evaporating temperature of the first refrigerant circuit to a target evaporating temperature determined within the evaporating temperature control range of the first refrigerant circuit, determine an evaporating temperature control range of a second refrigerant circuit on the basis of the humidity of the outdoor air, and control an evaporating temperature of the second refrigerant circuit to a target evaporating temperature determined within the evaporating temperature control range of the second refrigerant circuit.