Refrigerating device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multi-type refrigeration systems do not consider power consumption of the compressor when determining the set temperature, leading to increased power consumption for achieving the necessary amount of heat exchange, which results in a decrease in the coefficient of performance (COP) of the refrigeration system.
Innovation Solution
A refrigeration system with a capacity adjustment unit to change the compressor capacity and a pressure-reduction-amount adjustment unit to adjust the refrigerant outlet superheat degree, allowing the set temperature to be increased when the minimum target superheat degree is higher than a predetermined value, reducing compressor power consumption while maintaining the amount of heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the set temperature is determined without considering compressor power consumption, then the heat exchange amount can be achieved, but the compressor power consumption increases and COP decreases
Solution Approach 1:
The invention changes the set temperature parameter dynamically based on the relationship between target superheat degrees and actual superheat degrees. By adjusting the set temperature according to whether the actual superheat degree is higher or lower than the target, the system optimizes compressor power consumption while maintaining required heat exchange performance
Solution Approach 2:
The invention implements a feedback control mechanism where the actual superheat degree (calculated from actual evaporation temperature and refrigerant temperature at evaporator outlet) is continuously compared with the target superheat degree. Based on this comparison, the set temperature is adjusted to minimize compressor power consumption while ensuring heat exchange requirements are met
2Loss of energy
If the set temperature is increased to reduce compressor power consumption, then power consumption decreases, but the amount of heat exchange may be insufficient
Solution Approach 1:
The invention dynamically adjusts the set temperature parameter based on the deviation between target and actual superheat degrees. When the actual superheat degree is higher than target, the set temperature is increased to reduce compressor workload. When actual superheat degree is lower, the set temperature is decreased to maintain heat exchange performance. This dynamic parameter adjustment resolves the contradiction between power consumption and heat exchange amount
Solution Approach 2:
The invention makes the set temperature dynamic rather than fixed. The set temperature changes in real-time based on operating conditions and superheat degree deviations, allowing the system to adaptively balance between compressor power consumption and heat exchange performance according to actual system state
3Loss of energy
If the evaporation temperature is increased to reduce compressor power consumption, then power consumption decreases, but the refrigerant outlet superheat degree changes
Solution Approach 1:
The invention uses parameter change by adjusting the set temperature based on the relationship between superheat degree deviations and evaporation temperature. When actual superheat degree exceeds target, the system increases set temperature which raises evaporation temperature and reduces compressor power consumption. The control algorithm accounts for the resulting superheat degree change to maintain overall system efficiency
Solution Approach 2:
The invention applies local quality by making different parts of the control system have different functions: the set temperature adjustment handles the macro energy optimization, while the expansion valve opening adjustment handles the local superheat degree control. This division allows simultaneous optimization of both compressor power consumption and refrigerant outlet conditions
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 reduces compressor power consumption and minimizes the decrease in the coefficient of performance (COP) by adjusting the set temperature based on target superheat degrees, ensuring efficient heat exchange and operational efficiency.
Implementation Method 1
a refrigerant circuit (20) configured to perform a refrigeration cycle and including a compressor (21) having a variable capacity
Implementation Method 2
an amount of pressure reduction of a refrigerant passing through each of the expansion mechanisms (26)
Implementation Method 3
a plurality of evaporators (27)... an amount of heat exchange necessary for the evaporator (27)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An air conditioner (10) includes a refrigerant circuit (20) including a plurality of indoor heat exchangers (27). A controller (1) for controlling operation of the air conditioner (10) includes a change unit (5) configured to change a set temperature Tem to a value larger than a current value when the minimum target superheat degree SHsm: of target superheat degrees SHs determined for the respective indoor heat exchangers (27) is higher than a predetermined value SHt.