Heat pump system
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Solution Overview
Problem
Heat pump systems for new energy vehicles face challenges in efficiently utilizing heating capacity, especially in ultra-low temperature conditions, where the addition of intermediate heat exchangers can limit the operating range of the compressor and reduce system performance.
Innovation Solution
A heat pump system design incorporating a compressor, multiple heat exchangers, a flow regulating device, and a throttle element, where the intermediate heat exchanger is bypassed during heating mode to enhance heating capacity, and its heat exchange capacity is adjusted in cooling mode to optimize refrigerant flow and compressor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If intermediate heat exchangers are added to improve cooling capacity and energy efficiency, then cooling performance is improved, but heating capacity is reduced due to limited compressor operating range
Solution Approach 1:
The system dynamically switches the configuration of the intermediate heat exchanger between cooling and heating modes. In cooling mode, the intermediate heat exchanger is connected to improve energy efficiency. In heating mode, the intermediate heat exchanger is bypassed to maximize heating capacity. This dynamic reconfiguration allows the system to optimize performance for different operating conditions.
Solution Approach 2:
The intermediate heat exchanger is designed to serve multiple functions: it acts as a heat exchanger in cooling mode to improve energy efficiency, and as a bypassable component in heating mode to preserve heating capacity. The flow regulating device enables the intermediate heat exchanger to be selectively included or excluded from the refrigerant circuit based on the operating mode.
2Adaptability or versatility
If intermediate heat exchanger is used in heating mode, then heat recovery function is provided, but compressor operating range is limited and system performance is reduced
Solution Approach 1:
The system employs dynamic control through the flow regulating device to adjust the refrigerant flow path. During heating operation, the flow regulating device directs refrigerant to bypass the intermediate heat exchanger, eliminating the limitation on compressor operating range and maximizing system performance while still providing heat recovery capability when needed.
Solution Approach 2:
The intermediate heat exchanger is extracted from the mandatory heating pathway and placed in a bypassable configuration. This allows the heating cycle to proceed without being constrained by the intermediate heat exchanger's heat recovery function, thereby maintaining full system performance while preserving the option to use heat recovery when appropriate.
3Power
If throttle element is opened for heating mode, then heating capacity is improved, but heat exchange capacity of intermediate heat exchanger increases unnecessarily
Solution Approach 1:
The intermediate heat exchanger is extracted from the heating refrigerant circuit by implementing a bypass path. The flow regulating device controls the refrigerant flow to exclude the intermediate heat exchanger from the heating mode operation, preventing unnecessary heat exchange that would otherwise occur when the throttle element is opened for heating.
Solution Approach 2:
The flow regulating device acts as an intermediary that controls the refrigerant flow path. It selectively directs refrigerant through or around the intermediate heat exchanger based on the operating mode, ensuring that the intermediate heat exchanger does not participate in heat exchange during heating operations when its capacity would be unnecessary.
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 allows for effective heating performance in low temperatures by restricting the intermediate heat exchanger's usage during heating, ensuring efficient compressor operation and improved energy efficiency in cooling modes by adjusting the heat exchange capacity.
Implementation Method 1
a first heat exchanger, a second heat exchanger, a third heat exchanger, and a fourth heat exchanger... The second heat exchanger includes a first heat exchange portion and a second heat exchange portion which are capable of exchanging heat with each other
Implementation Method 2
the flow regulating device throttles and depressurizes a refrigerant
Implementation Method 3
a compressor... an outlet of the compressor is in communication with an inlet of the fourth heat exchanger
Data Source
AI summary
A heat pump system includes a compressor, a fluid switching device, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a flow regulating device and a throttle element. The second heat exchanger includes a first heat exchange portion and a second heat exchange portion. An outlet of the first heat exchange portion communicates with the throttle element. An inlet of the first heat exchange portion communicates with at least one of a second port of the third heat exchanger and an outlet of the fourth heat exchanger. An inlet of the second heat exchange portion communicates with the outlet of the first heat exchanger. An outlet of the second heat exchange portion communicates with an inlet of the compressor. In a heating mode, the function of the second heat exchanger is reduced, thereby the heating capacity of the heat pump system is improved.