Refrigeration apparatus
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Solution Overview
Problem
Existing refrigeration apparatuses face challenges in efficiently adjusting compressor operating frequency to match changing cooling target temperatures, leading to potential overheating or undercooling of the refrigerant, which affects the cooling performance and efficiency.
Innovation Solution
A refrigeration apparatus with a control device that adjusts the compressor's operating frequency based on the temperature change of the second heating medium in the second heat exchanger, switching between different operating modes to optimize cooling performance by varying the acceleration of the compressor's frequency change in response to temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor operating frequency is adjusted based on cooling target temperature, then the cooling performance is improved, but the refrigerant may overheat or undercool affecting efficiency
Solution Approach 1:
The control device continuously monitors the temperature of the second heating medium in the second heat exchanger and uses this feedback to dynamically adjust the compressor operating frequency. This closed-loop control ensures the compressor responds accurately to actual thermal conditions, preventing both overcooling and overheating while optimizing energy efficiency.
Solution Approach 2:
The system dynamically adjusts the compressor operating frequency based on real-time temperature conditions of the second heating medium. By making the compressor operation dynamic rather than static, the system adapts to changing thermal loads and maintains optimal cooling efficiency across varying operating conditions.
2Speed
If the compressor frequency changes rapidly to respond to temperature changes, then the cooling response speed is improved, but the system stability deteriorates
Solution Approach 1:
The system implements dynamic frequency adjustment with two distinct acceleration modes. When the temperature increase rate of the second heating medium is high (exceeding threshold), the compressor frequency increases rapidly with second acceleration. When the temperature increase rate is low (at or below threshold), the frequency increases more gradually with first acceleration. This dynamic adaptation allows fast response when needed while maintaining stability during normal operation.
Solution Approach 2:
The control device changes the acceleration parameter of frequency adjustment based on the temperature increase rate of the second heating medium. By switching between first acceleration (lower rate) and second acceleration (higher rate) modes, the system optimizes the balance between response speed and stability according to actual thermal conditions.
3Speed
If the compressor operating frequency is increased to cool the cooling target quickly, then the cooling speed is improved, but the risk of undercooling or overheating increases
Solution Approach 1:
The control device uses real-time temperature feedback from the second heating medium to regulate compressor frequency. This feedback mechanism prevents excessive cooling or heating by continuously comparing actual temperature conditions with desired conditions and adjusting compressor operation accordingly, ensuring reliable temperature control.
Solution Approach 2:
The system dynamically adjusts compressor frequency based on the rate of temperature change in the second heating medium. When temperature rises rapidly, the compressor frequency increases more aggressively. When temperature rises slowly, the frequency increases more conservatively. This dynamic approach maintains high cooling speed while preventing temperature extremes.
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 solution allows for quick and efficient cooling of the cooling target by adjusting the compressor's frequency in response to temperature changes of the second heating medium, preventing overheating or undercooling and enhancing the overall cooling performance.
Implementation Method 1
a first heat exchanger configured to allow a first heating medium compressed by the compressor to flow therein and radiate heat of the first heating medium
Implementation Method 2
a second heat exchanger configured to allow the first heating medium having passed the first heat exchanger and a second heating medium provided to cool a cooling target to flow therein and cause heat exchange between the first heating medium and the second heating medium
Data Source
AI summary
A refrigeration apparatus includes: a compressor; a first heat exchanger that allows a first heating medium compressed by the compressor to flow therein and to radiate heat of the first heating medium; a second heat exchanger that allows the first heating medium having passed the first heat exchanger and a second heating medium cooling a cooling target to flow therein, and causes heat exchange between the first heating medium and the second heating medium; a first temperature sensor that detects temperature of the second heating medium in the second heat exchanger; and a control device that controls an operating frequency of the compressor.