The selection and application of heat exchangers are crucial in the liquid cooling system of electric vehicle charging stations. The following are several common types and applications of heat exchangers:
plate heat exchanger
Working principle: It is composed of a series of metal sheets with certain ripple shapes stacked together, and heat exchange between the cooling liquid and the external medium is achieved through the flow channels between the sheets.
Application scenario: Suitable for charging pile liquid cooling systems with high space requirements and large flow rates. It has a compact structure and high heat transfer efficiency, and can flexibly combine the number of plates and flow channel forms according to the power and heat dissipation requirements of the charging pile.
tube heat exchanger
Working principle: The tube bundle is composed of pipes, with cooling liquid flowing inside the pipes and external medium flowing outside the pipes, exchanging heat through the pipe walls.
Application scenario: Commonly used for charging stations with high reliability requirements and harsh working environments. Its structure is sturdy, resistant to high voltage and high temperature, and not easy to leak. It is suitable for some occasions with strict safety requirements, such as outdoor high-power charging piles.
microchannel heat exchanger
Working principle: Adopting microchannel structure increases the heat transfer area and improves the heat transfer efficiency. The coolant flows within the microchannel and efficiently exchanges heat with external air or other cooling media.
Application scenario: Especially suitable for electric vehicle charging stations that require high heat dissipation performance and space. It has a small volume and light weight, and can achieve efficient heat dissipation in a limited space. It is commonly used in compact charging stations or high-power charging modules with strict heat dissipation requirements.
Before You Start
A successful Selection of heat dissipation for electric vehicle charging piles project begins with measurement. Record the supply and exhaust airflow rates, the temperatures on each side, and the hours the system runs per year. Note any contaminants in the exhaust and the available space for the core and ductwork. These figures decide both the type of exchanger and whether the payback makes sense.
Step-by-Step
First, choose the exchanger type from the air cleanliness and recovery target. Second, size the core using the measured airflow and the log-mean temperature difference, leaving margin for fouling. Third, lay out the duct path so the exhaust is filtered before the core and the supply side has drainage if it may condense. Fourth, add a bypass for free cooling and wire the fans to a simple control. Finally, commission the unit and record baseline temperatures.
Verification
After startup, compare the pre- and post-installation supply temperatures at the same outdoor condition. A steady recovery of 50 percent or more confirms correct sizing. Re-check each season and clean the exhaust side when the recovered temperature begins to fall, because fouling quietly erodes performance over time.
Frequently Asked Questions
Do I need a bypass? In most climates yes, so the system can free-cool when outdoor air is mild. How is sizing done? From measured airflow and the log-mean temperature difference, not from estimates.