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THERMAL MANAGEMENT IN ELECTRIC VEHICLES
| 题名： | THERMAL MANAGEMENT IN ELECTRIC VEHICLES |
| 正文语种： | eng |
| 作者： | ADAM KIMMEL |
| 作者单位： | The Chemours Company |
| 摘要： | Then shops consider how best to prepare for electric vehicle service, thermal management is integral to the conversation. And, like many EV topics, servic-ing these vehicles presents several critical differences from the air conditioning and heating systems in combustion engine vehicles (ICEVs) that the automotive aftermarket has been servicing for decades. Unlike traditional ICEVs, thermal management in EVs takes a much more holistic approach to heating and cooling the vehicle because the lack of combustion removes a substantial source of high-quality heat. Moreover, there are several factors driven by EV technology that the thermal management system must consider. One example is "range anxiety," which is a driver's need to be confident they will be able to travel the desired distance on a charge. Energy used for heating, cooling or other functions represents energy no longer available to propel the vehicle. Another differentiator with EVs is their overarching mission to create a healthier, more sustainable planet with low-carbon emissions. An EVs thermal management must contribute to this mission, especially since OEMs and suppliers are publicly stating sustainability goals.These and other considerations have led to what, currently, are two main thermal management approaches in EV engineering. The first is the use of a positive temperature coefficient (PTC) heating element. This device draws voltage from the battery for cabin heating -which in turn lowers the vehicle range. This side effect is a key reason we're seeing fewer new EVs with electric heating coils and more with heat pump systems. Rather than generating heat, heat pumps move heat from one place to another - either absorbing heat from ambient air and transferring it into the cabin for warmth or removing heat from the cabin to cool it. Heat pumps are highly attractive for EVs because, in essence, they utilize an endless reserve of "free" source energy from outside air and transport up to three times its required operating energy load.A heat pump's effectiveness relies heavily on its refrigerant. So, it may come as no surprise that R-1234yf - the same refrigerant quickly overtaking automotive manufacturing and the aftermarket as the refrigerant of choice for air conditioning systems in other types of vehicles-is dominating the EV space as the preferred refrigerant for heat pumps. This is due to its low boiling point. In addition to its heat pump benefits, R-1234yf offers similar cooling capacities and vapor densities as legacy refrigerants, delivering superior A/C performance. |
| 出版年： | 2022 |
| 期刊名称： | Motor age |
| 卷： | 141 |
| 期： | 7 |
| 页码： | 40-40 |
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