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Weiwei Wang

Weiwei Wang

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Purpose

Provide ventilation to the driver and battery.

Requirements

Driver

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Airflow

While no quantitative requirement is set in regs, I don’t think having a pinhole sized vent will pass. Since it is left to the discretion of the inspector, we should aim to size the vent and duct such that it would not “look unreasonable” if it was in an actual car. A 2in diameter opening + duct, or an equivalent cross-sectional area, sounds like a reasonable lower bound.

Filtration

While not required, since it is blowing at the driver’s face it would be nice if it did does not suck through fine particulate matter from the road. Intakes should also protect against water ingress.

Battery

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Airflow

The intake/exhaust and ducting should aim to maintain a cross sectional area greater than a 4in diameter circle. This standard is currently based on nothing other than it feels off to have ducting less than half the area of the fans, which are a circle approximately 6in in diameter.

Duct Path

Below are concept sketched for the duct path for both the intake and exhaust of the battery box.

The exhaust will be fairly straightforward, routing the ducts straight back towards the tail, where both ducts will converge to the same opening in the car’s tail.

For the intake, the ducts will be routes towards the edges of the aerobody, outside of the chassis (there seems to be a lot of room to work with so this shouldn’t be an issue?). The intake ducts will vent through the front wheel wells, which can be accessed through the front ribs on both sides.

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For the dashboard, the aim is to minimize the space consumed by the duct routing. Two proposed paths are shown below, from the dashboard to the inner side of the wheel well, depending on available space.

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Battery Box Duct Attachments

As the exhaust ducts are routing to the same spot, the attachment is 1 part, featuring a 10in x 1in opening for the air to vent out of the tail. The exhaust ducts are 4in in diameter.

Development/INT/Ventilation/XV-INT-VENT002- tail exhaust attachment

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The intake ducts are to be routed into the front wheel wells, so the attachments are going to be fastened to the front ribs on the left and right side. There is a 1in flange around the attachment to fasten it to the rib.

Development/INT/Ventilation/XV-INT-VENT001- front rib intake attachment

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Dashboard Duct Attachments

To secure the duct to the dashboard, a simple 4in diameter cylindrical extrusion is attached to a flange to allow for the attachment to be adhered to the dashboard and the duct to be placed over the cylinder and attached with tape or other adhesive.

The dimensions of the flange are modelled to match the height of the dashboard, at 110mm in height and 120mm in width.

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Filtration

We should try to maintain the same standard as for the driver, although there might be some room to relax it a little when it comes to fine particulate matter.