Microchannel Heat Exchanger Layout for Dual-Compressor Airflow Balance
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Solution Overview
Problem
In cooling systems with microchannel heat exchangers arranged in face-split or row-split configurations, inefficiencies arise due to uneven airflow and heat transfer when one compressor is turned off, leading to reduced system efficiency.
Innovation Solution
The microchannel heat exchangers are arranged one in front of the other along the airflow direction, with each heat exchanger shared by both compressors and divided into sections by partitioning baffles, allowing refrigerant from each compressor to flow through the heat exchanger at the front, and overlapping pipes ensure continuous airflow and heat transfer even when a compressor is shut off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If microchannel heat exchangers are arranged in face-split configuration with one on top of the other, then each compressor has dedicated heat exchanger, but system efficiency reduces when one compressor is turned off because airflow cannot be reduced
Solution Approach 1:
The patent merges the heat exchanger assignments by allowing both compressors to share both heat exchangers. The first heat exchanger receives refrigerant from both compressors and transfers heat to airflow, while the second heat exchanger also receives refrigerant from both compressors. This merging eliminates the dedicated one-to-one mapping and enables flexible airflow utilization regardless of compressor status.
Solution Approach 2:
Each heat exchanger is designed to handle refrigerant from either or both compressors, making them universal components rather than dedicated to a single compressor. The first heat exchanger can serve compressor 1, compressor 2, or both simultaneously, and the same applies to the second heat exchanger, providing multi-functionality that adapts to varying operational demands.
2Speed
If microchannel heat exchangers are arranged in row-split configuration one in front of the other, then airflow direction is optimized, but the front heat exchanger experiences more heat transfer than the back, reducing system efficiency
Solution Approach 1:
The patent combines the refrigerant streams from both compressors into both heat exchangers, allowing the airflow to be utilized effectively across the entire heat exchanger assembly. The first heat exchanger in the airflow path receives refrigerant from both compressors and transfers heat to the airflow, while the second heat exchanger also receives refrigerant from both compressors, ensuring balanced heat transfer distribution.
3Device complexity
If dedicated heat exchangers are used for each compressor, then system configuration is simplified, but airflow is wasted when one compressor is shut off
Solution Approach 1:
The patent merges the refrigerant flow paths by directing refrigerant from both compressors to both heat exchangers. This is achieved through a manifold system where the first manifold receives refrigerant from both compressors and distributes it to the first heat exchanger, and the second manifold receives refrigerant from both compressors and distributes it to the second heat exchanger, eliminating wasted airflow.
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 configuration improves system efficiency by utilizing airflow and heat transfer across the entire face of the heat exchanger, even when one compressor is inactive, enhancing energy savings and performance.
Implementation Method 1
Refrigerant can flow through these microchannels and heat is transferred to or from the refrigerant to the surrounding air while the refrigerant flows through these microchannels
Implementation Method 2
The heated refrigerant from the heat exchanger is then sent to a compressor that compresses the refrigerant to a higher pressure to facilitate heat rejection
Implementation Method 3
Air to be cooled flows over a low side heat exchanger (e.g., an evaporator) that carries cold refrigerant. The refrigerant enters the low side heat exchanger and absorbs heat from the air surrounding the heat exchanger, thereby cooling the air
Data Source
AI summary
An apparatus includes first and second microchannel heat exchangers and first and second pipes. The first heat exchanger includes a first inlet, a second inlet, a first tube, a second tube, a first outlet, and a second outlet. Refrigerant at the first inlet is directed through the first tube to the first outlet and the first pipe. Refrigerant at the second inlet is directed through the second tube to the second outlet and the second pipe. The second heat exchanger includes a third inlet, a fourth inlet, a third tube, a fourth tube, a third outlet, and a fourth outlet. The third inlet directs refrigerant from the first pipe through the third tube towards the third outlet. The fourth inlet directs the refrigerant from the second pipe through the fourth tube towards the fourth outlet. The first pipe overlaps the second pipe between the two heat exchangers.