Bandzai
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Joined: Mon Jun 01, 2020 9:12 am
Delivery Date: 01 Jun 2020

What are these pipes for?

Wed Jun 03, 2020 6:15 am

Hi,

I'm choosing a Leaf to buy made 2013 and later. I've noticed that under the hood some have additional pipes, but I can not find what feature they are for.

This one from 06-2013 does have it:
Image

This one from 05-2013 doesn't:
Image

So what does this specific Leaf of 06-2013 can do that the 05-2013 one can't? Is it that one has a heat pump and the other doesn't? Or is it for better cooling? Is it tied to the trims or separate additional equipment?

Thanks in advance!

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OrientExpress
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Delivery Date: 10 May 2011
Leaf Number: 2331
Location: San Jose, Ca

Re: What are these pipes for?

Wed Jun 03, 2020 7:37 am

Those pipes are for the Heat Pump hardware.
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estomax
Posts: 258
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Leaf Number: 424033
Location: Seattle

Re: What are these pipes for?

Wed Jun 03, 2020 10:15 am

yeah the bottom one is probably an S model, SV and SL came with heat pumps
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DougWantsALeaf
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Leaf Number: 407811
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Re: What are these pipes for?

Wed Jun 03, 2020 3:13 pm

Any risk of insulating the heat pump.
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LeftieBiker
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Re: What are these pipes for?

Wed Jun 03, 2020 3:16 pm

You'd really only want one line insulated: the one supplying the hot or cold refrigerant to the cabin.
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Nubo
Posts: 5702
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: What are these pipes for?

Wed Jun 03, 2020 3:22 pm

LeftieBiker wrote:
Wed Jun 03, 2020 3:16 pm
You'd really only want one line insulated: the one supplying the hot or cold refrigerant to the cabin.
Iirc, for AC you'd only want to insulate the cold line to the cabin. The hot line is destined to be cooled in the condenser anyway so any heat lost on the way there is only beneficial. Did this on my RX-8 whose cooling system was a bit marginal. As for a heat-pump system I'd first check to see if the same pipe doesn't play both roles.

But no, don't insulate the compressor, especially the electric compressor in an EV. That's a hard-working electric motor that needs to dissipate its heat.
I noticed you're still working with polymers.

AlGrsn
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Joined: Tue Jul 14, 2020 9:33 pm
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Leaf Number: 327864

Re: What are these pipes for?

Tue Jul 14, 2020 10:17 pm

A "heat pump" is jargon for a reversible heat pump. For cooling ("Air Conditioning") the radiator inside the dashboard is an evaporator; the radiator out front ahead of the engine or drive motor-reduction gearbox-inverter cooling radiator or, in the Leaf, beside it, is the condenser. When reversed the inside radiator is a condenser; the outside is an evaporator.
Air-source heat pumps become rather inefficient below 35°-40°F / °C. By 5°F they are doing just about nothing. For effective heating a supplementary source of heat is needed. Waste heat from the drive motor, reduction gearbox and inverter is free but is almost non-existent when coasting downhill. If practical, heat from a liquid cooled battery pack is also good; again, when the battery is hot from heavy current draw during acceleration and hill-climbing it is a good source, but when little power is being drawn the battery pack gives off little heat.
A supplementary booster resistance heater is a good heat source but draws the battery down.

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