Refrigeration system, control method thereof and transport vehicle
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Solution Overview
Problem
Refrigeration systems in transport vehicles face inefficiency in the hot-gas bypass heating mode due to the cooling effect of refrigerant bypassed to the reservoir counteracting the heating effect, leading to reduced system efficiency when ambient temperatures are low.
Innovation Solution
A refrigeration system with a control valve in a branch flow path allows a portion of refrigerant to pass through the reservoir and throttling element before returning to the compressor in hot-gas bypass heating mode, and the control valve is closed after a delay time to prevent reverse flow and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a small part of superheated steam is delivered to the reservoir to discharge remaining refrigerant, then the refrigerant in the bypassed circuit can participate in the heating cycle, but the refrigerant produces a cooling effect in the heat exchanger that counters the heating effect and lowers system efficiency
Solution Approach 1:
The invention extracts the harmful cooling effect by routing the refrigerant discharged from the reservoir through a separate bypass line that bypasses the heat exchanger. This allows the refrigerant to be discharged without counteracting the heating effect in the heat exchanger, thereby maintaining system efficiency while still enabling the heating cycle to utilize the refrigerant.
Solution Approach 2:
The invention segments the refrigerant flow path by creating a separate bypass line for reservoir-discharged refrigerant. This segmentation allows different portions of the refrigerant to take different paths: the main heating refrigerant flows through the heat exchanger while the reservoir-discharged refrigerant bypasses it, eliminating the harmful cooling effect.
2Loss of energy
If refrigerant is delivered directly to the heat exchanger in hot-gas bypass heating mode, then heating efficiency is improved, but refrigerant remaining in the reservoir cannot participate in the heating cycle
Solution Approach 1:
The invention introduces a control valve as an intermediary device that manages the flow of refrigerant from the reservoir. This valve enables selective discharge of reservoir refrigerant through the bypass line, allowing the system to maintain high heating efficiency while also utilizing the refrigerant stored in the reservoir through controlled release.
3Productivity
If the control valve remains open to allow refrigerant through the branch flow path, then refrigerant utilization is improved, but the cooling effect continues to counteract the heating effect
Solution Approach 1:
The invention applies dynamic control by adjusting the control valve to open only during a specific time window after heating mode activation. This dynamic approach allows the system to discharge reservoir refrigerant temporarily without creating a sustained cooling effect that would counteract the heating process, thereby balancing refrigerant utilization with heating 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 configuration improves the efficiency of the refrigeration system by minimizing the cooling effect and optimizing the heating function, thereby maintaining system performance across varying ambient temperatures.
Implementation Method 1
the superheated steam at the outlet of the compressor
Implementation Method 2
the superheated steam at the outlet of the compressor is directly bypassed to the heat exchanger in the container for heating
Implementation Method 3
refrigerant stored in the reservoir passes through the throttling element and the second heat exchanger
Data Source
Figure 1~2
AI summary
The present application provides a refrigeration system, a control method thereof and a transport vehicle including the refrigeration system. The refrigeration system comprises: a compressor (1), a first heat exchanger (3), a reservoir (4), a throttling element (5) and a second heat exchanger (6) in the refrigeration circuit. The refrigeration system comprises a cooling mode and a hot-gas bypass heating mode. In the hot-gas bypass heating mode, the refrigerant leaving the outlet (11) of the compressor (1) is delivered directly to the second heat exchanger (6) before returning to an inlet (12) of the compressor (1), wherein, the refrigeration system further comprises a branch flow path (90) with a control valve (9) provided thereon. The control valve (9) is capable of being opened or closed in the hot-gas bypass heating mode. When the control valve (9) is opened, a portion of the refrigerant leaving the outlet (11) of the compressor (1) is delivered to the reservoir (4) after passing through the branch flow path (90), such that the refrigerant stored in the reservoir (4) passes through the throttling element (5) and the second heat exchanger (6) in turn before returning to the inlet (12) of the compressor (1). When the control valve (9) is closed, the branch flow path (90) is cut off.