Heat source unit and air-conditioning device
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Solution Overview
Problem
Existing air conditioner systems face challenges in efficiently performing cooling, heating, and simultaneous cooling and heating operations due to variations in air-conditioning load, which can lead to imbalances in refrigerant heat, affecting cooling and heating capacities and causing ice formation issues in outdoor heat exchangers.
Innovation Solution
The air conditioner system incorporates a heat source unit with a compressor, first and second heat exchange sections, and switching valves that allow for flexible operation modes by switching between different communication states of the high and low-pressure gas connection pipes and suction/discharge sides, ensuring stable operation and efficient heat transfer through the use of a larger first heat exchange section and a smaller second heat exchange section arranged below, with the second section acting as a radiator to reduce ice growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the air conditioner performs cooling, heating, and simultaneous cooling and heating operations with varying loads, then the system provides versatile air conditioning functions, but imbalances in refrigerant heat occur affecting cooling and heating capacities
Solution Approach 1:
The outdoor heat exchanger is divided into a first heat exchange section and a second heat exchange section, allowing independent control of refrigerant flow to each section through separate expansion valves. This segmentation enables balanced heat exchange across different operation modes, preventing refrigerant heat imbalance while maintaining versatile cooling and heating functions.
2Adaptability or versatility
If the outdoor heat exchanger operates under varying loads, then the system adapts to different air conditioning demands, but ice formation occurs in the outdoor heat exchanger
Solution Approach 1:
The second heat exchange section is specifically designed with a smaller size and positioned below the first section, creating different local thermal characteristics. This local quality differentiation ensures that the lower section can effectively dissipate heat to prevent ice formation, while the upper section provides primary heat exchange capacity, thus resolving the ice formation issue under varying loads.
3Object-affected harmful factors
If the second heat exchange section is used to reduce ice growth, then ice formation is prevented, but the overall heat exchange capacity may be reduced
Solution Approach 1:
The second heat exchange section is positioned below the first section in a vertical arrangement, utilizing the vertical dimension to accommodate both heat exchange functions. This spatial differentiation allows the lower section to serve as an anti-ice section while the upper section provides primary heat exchange, maintaining overall heat exchange capacity while preventing ice formation.
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 enables stable operation across varying air-conditioning loads, maintains adequate refrigerant heat balance, and reduces ice formation on the outdoor heat exchanger by ensuring the second heat exchange section effectively dissipates heat and melts accumulated ice, thus enhancing both cooling and heating capacities.
Implementation Method 1
a compressor (11) configured to compress a refrigerant
Implementation Method 2
a first heat exchange section (21) configured to exchange heat between the refrigerant and air; a second heat exchange section (22) configured to exchange heat between the refrigerant and the air
Implementation Method 3
a liquid line (28) connected to a liquid end of the first heat exchange section (21) and a liquid end of the second heat exchange section (22), the liquid line (28) being provided with a receiver (25) configured to accumulate the refrigerant
Data Source
AI summary
A heat source unit includes: a first switching valve configured to switch between a first state where the first switching valve brings a discharge side of a compressor and a high and low pressure gas connection pipe into communication with each other and a second state where the first switching valve brings the high and low pressure gas connection pipe and a suction side of the compressor into communication with each other; a second switching valve configured to switch between a third state where the second switching valve brings the discharge side of the compressor and a gas end of a first heat exchange section into communication with each other and a fourth state where the second switching valve brings the suction side of the compressor and the gas end of the first heat exchange section into communication with each other; and a refrigerant flow path provided with the second heat exchange section, and having two ends respectively connected to the discharge side of the compressor and a portion of the liquid line upstream of the receiver.