Refrigeration apparatus and method for controlling the same
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional refrigeration apparatuses tend to unnecessarily lower the target evaporation temperature, leading to increased compressor operation frequency and power consumption, especially when transitioning from thermo-off to thermo-on states or post-defrost operations, without adequately considering load variations in the cooled space.
Innovation Solution
A refrigeration apparatus with a target evaporation temperature calculating unit that measures high-temperature duration times and updates the target evaporation temperature by a set subtraction coefficient only after a predetermined update reference time, preventing premature lowering and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target evaporation temperature is constantly updated based on interior temperature differences, then the cooling capacity is increased, but the compressor operation frequency rises unnecessarily and power consumption increases
Solution Approach 1:
The system performs preliminary assessment by measuring the interior temperature for a predetermined time period before updating the target evaporation temperature. This preliminary action prevents premature temperature updates that would otherwise cause unnecessary compressor operation and increased power consumption.
Solution Approach 2:
The system dynamically adjusts the target evaporation temperature based on measured interior temperature variations over time. By making the temperature update conditional on actual measured data rather than constant adjustment, the system optimizes compressor operation frequency and reduces unnecessary power consumption while maintaining adequate cooling capacity.
2Speed
If the target evaporation temperature is lowered immediately when interior temperature is high, then the cooling response is faster, but the temperature is lowered more than necessary before the load is accurately determined
Solution Approach 1:
The system performs preliminary temperature measurement over a predetermined time period before determining the load state and updating the target evaporation temperature. This preliminary measurement ensures accurate load assessment before taking cooling action, preventing premature temperature adjustments.
Solution Approach 2:
The system uses the interior temperature measurement itself as the basis for determining when to update the target evaporation temperature. By monitoring the temperature over time and using the measured data to trigger updates, the system self-regulates the cooling response timing without external intervention, balancing response speed with measurement accuracy.
3Adaptability or versatility
If the target evaporation temperature is updated frequently, then the system adapts quickly to load changes, but the compressor operation frequency increases and power consumption rises
Solution Approach 1:
The system performs preliminary temperature measurement and evaluation before updating the target evaporation temperature. This preliminary action ensures that temperature updates occur only when necessary, maintaining load adaptation capability while avoiding unnecessary compressor operations that would reduce operational efficiency and increase power consumption.
Solution Approach 2:
The system uses feedback from interior temperature measurements taken over a predetermined time period to determine when to update the target evaporation temperature. This feedback mechanism ensures the system adapts to actual load changes while avoiding unnecessary updates that would increase compressor frequency and reduce operational 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 prevents unnecessary target evaporation temperature lowering, reducing power consumption and ensuring appropriate cooling capacity by delaying the reduction in target evaporation temperature until necessary, thus optimizing operational efficiency.
Implementation Method 1
an indoor unit (2) which cools air in a to-be-cooled space (9)... an evaporator (6) which causes the low-temperature liquid refrigerant reduced in pressure by the expansion valve (5) to evaporate to thereby perform cooling
Implementation Method 2
an evaporator (6) which causes the low-temperature liquid refrigerant reduced in pressure by the expansion valve (5) to evaporate to thereby perform cooling
Implementation Method 3
the outdoor unit (1) includes a compressor (3) and a condenser (4)... a compressor (3) and a condenser (4), and an indoor unit (2) installed in a to-be-cooled space
Data Source
AI summary
A refrigeration apparatus has a refrigerant circuit formed by connecting a compressor, a condenser, an expansion valve, and an evaporator by a refrigerant pipe. The refrigeration apparatus includes a temperature duration time measuring unit, and a target evaporation temperature calculating unit. The temperature duration time measuring unit measures a high-temperature duration time in a thermo-off state, the high-temperature duration time being time during which the temperature of the interior of a to-be-cooled space is higher than a lowering threshold which is set with reference to a target interior temperature. The target evaporation temperature calculating unit updates the target evaporation temperature by decreasing the target evaporation temperature by a set subtraction coefficient, after the high-temperature duration time becomes greater than or equal to an update reference time.