Battery-assembled compact electric car platform and heat pump-typed cooling/heating system

Technology overview: The traditional air conditioning devices for electric cars are comprised of a cooling system that uses refrigerant, ie. vapor compression cycle, and a heating system that uses an electric heater, and it operates these two systems at the same time to maintain an appropriate temperature and comfort inside the car. This product has commercialized a heat pump system for electric car, which uses the existing vapor compression cycle, capable of using the cold spot of refrigerant for cooling use under the condition where outdoor temperature is high, and the hot spot https://korean-machinery.com///inquiryof refrigerant can be used for heating use under the condition where outdoor temperature is low. Traditional heaters that use electricity have thermal efficiency lower than 1 (0.9~0.95), consuming electricity energy more than required quantity of heat. While, the heat pump  system  has COP bigger  than 1 at all times (1.5~4), which helps reduce energy consumption by 30~60% compared to the system that uses an electricity heater to get the equivalent heating performance. In addition, it collects waste heat generated from application components of an electric car, such as inverter and drive motor, with the use of the heat pump system helping improve COP and reduce parasitic power. As a result, we could extend distance per charge by about 21% through power saving of the battery of a system requiring heating source up to 7kW for an electric car, and we have secured technology for domestically designing a heat pump system for electric cars.

Industrialization: With regard to developing a high-performance heat pump system using waste heat for the first time in the world, we have enhanced the endurance for components, at the same time being capable of domestically producing all components except for a refrigerant change valve. In addition, as we have realized power saving required for heating the inner space of a vehicle, compared to other competitor’s performance, with driving distance per charge of an electric car being increased. With this, we could satisfy customers’ requirements for increasing driving distance per charge, and have secured better competitiveness than our competitors, resulting in enhanced productivity. Further, with respect to applying a heat pump system to a vehicle, it was required to run dehumidifying and defrosting operations at the same time to remove moisture and frost on the window to assure a driver’s visibility and automatic temperature variable control operation to control the indoor air conditioning. To realize these, we have implemented integrated control logic of optimized operation satisfying the performance required by an air conditioning system for automobiles by properly combining cooling/heating modes, frost recognition and continuous operation modes. As a result, we have secured an independent technology for domestically designing a high- performance heat pump system.

Untitled-17Problem-solving in industrialization: With respect to developing a high-performance air conditioning system to extend the driving distance of an electric car, we have dramatically extended it by about 21% when running a heating system through COP improvement and power-saving by collecting only waste heat generated from application components, such as an inverter and a drive motor, of an electric car with the use a heat pump system. Then, with respect to extending the operation range of a heat pump system when it is -20℃ outside, a heat pump system tends to have deteriorated performance and endurance as the exterior temperature becomes low, due to the characteristics of refrigerant. Thus, it was not possible to run the system at low temperatures. This technology enables the waste heat generated in the application components suffers heat exchange with the refrigerant of low temperature at the entrance of the compressor, increasing the amount of refrigerant flow, and leading to secure an endurance enabling the system to run at up to -20℃. Finally, with respect to developing control technology enabling continuous operation after recognizing frost generation and ice formation on the outdoor fan, in order to overcome the frost generation and ice formation issues, which are chronic ones of a heat pump system, we have developed a method to recognize frost generation and ice formation in an outdoor fan, leading the refrigerant to the inner circulation cycle mode if frost generation is recognized so that the heat pump can continuously work in the heating mode without having a section of defrost operation.

Technology developer:

Hyundai Kia Motors / +82-80-600-6000 / www.hyundai.com

Hanonsystems Co., Ltd. / +82-42-930-6114 / www.hanonsystems.com

korean-machinery.com | Blog Magazine of korean-machinery, brands and Goods

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