EV Heating System Multiple Refrigerating Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heating systems for electric or hybrid vehicles often fail to provide adequate cooling, especially during high-speed operation and rapid charging, due to limitations in air-conditioning output, requiring larger compressors that increase costs, installation space, and acoustic issues under partial load conditions.
Innovation Solution
A heating system with multiple separate refrigerating circuits, each thermally connected to a common coolant circuit, allowing for flexible switching and efficient operation by assigning different air-conditioning tasks to each circuit, using smaller compressors and existing components, and incorporating a control unit for demand-based activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single large refrigerating circuit is used to provide adequate cooling output, then cooling capacity is sufficient, but device complexity and cost increase
Solution Approach 1:
The refrigerating system is divided into multiple separate refrigerating circuits (first refrigerating circuit, second refrigerating circuit, etc.), each with its own compressor and condenser. This segmentation allows the system to achieve high cooling capacity through parallel operation of multiple smaller circuits rather than requiring a single large complex circuit, thereby reducing overall system complexity and cost while maintaining adequate cooling output.
2Power
If a single large compressor is used to provide adequate cooling output, then cooling capacity is sufficient, but acoustic issues and cost increase
Solution Approach 1:
The single large compressor is replaced by multiple smaller compressors distributed across separate refrigerating circuits. These smaller compressors operate at lower noise levels individually, and when running in parallel, they provide the same total cooling capacity as a single large compressor while significantly reducing acoustic noise and vibration issues.
Solution Approach 2:
The control unit can selectively activate or deactivate individual compressors based on the current cooling demand. This periodic or intermittent operation of multiple compressors allows the system to maintain adequate cooling output while minimizing acoustic noise, especially during partial load conditions when not all compressors need to run simultaneously.
3Object-affected harmful factors
If smaller compressors are used in multiple circuits, then acoustic issues are minimized, but cooling capacity per circuit is reduced
Solution Approach 1:
Multiple smaller refrigerating circuits with smaller compressors are merged into a unified system that collectively provides the total cooling capacity needed. While each individual circuit has reduced cooling output, the parallel combination of multiple circuits achieves the same or greater total cooling capacity as a single large circuit, while minimizing acoustic noise from each compressor unit.
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 scalable air-conditioning output, reduced component diversity, and improved efficiency by utilizing smaller compressors, minimizing acoustic issues, and optimizing coolant flow, effectively addressing cooling demands during high-speed and rapid charging operations.
Implementation Method 1
The heating system has a first refrigerating circuit in which a refrigerant is compressed and conveyed in particular by way of a compressor
Implementation Method 2
The first refrigerating circuit has an air-conditioning evaporator for air-conditioning the interior
Implementation Method 3
a first condenser, by which the first refrigerating circuit is thermally coupled to the coolant circuit, for discharging heat from the first refrigerating circuit
Implementation Method 4
a heating circuit, to which a heating heat exchanger is connected, for air-conditioning the interior
Implementation Method 5
having a cooling circuit to which a cooler and a heat source are connected
Data Source
AI summary
A heating system for an electric or hybrid vehicle, to which a high-voltage accumulator is connected, includes a coolant circuit having a heating circuit to which a heating heat exchanger is connected for air-conditioning the interior, and having a cooling circuit to which a cooler and a heat source are connected. The heating system has at least two refrigerating circuits, wherein a first refrigerating circuit includes an air-conditioning evaporator for air-conditioning the interior, and a first condenser, by which the first refrigerating circuit is thermally coupled to the coolant circuit in order to dissipate heat from the first refrigerating circuit. The second refrigerating circuit is thermally coupled by a second condenser to the coolant circuit. The two refrigerating circuits, however, are not coupled to each other. At least one of the refrigerating circuits further includes a chiller in order to dissipate heat from the coolant circuit.