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sjfotos
Posts: 667
Joined: Thu Apr 22, 2010 5:21 am
Delivery Date: 26 Jun 2015
Location: Mechanicsburg, PA

Re: Heater

Mon Apr 26, 2010 6:37 pm

Karen,
I do appreciate the citations and the perspective. I am simply making the observation that I think it very unlikely that a team of engineers at a major global company did not consider the relative merits of the system you describe. They have many factors to balance and though I have a great amount of respect for advanced engineering topics, the automotive industry does have some reason to adopt a more conservative solution when the call gets close. The number of things that can go wrong are endless even in the well understood systems.
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LTLFTcomposite
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Delivery Date: 10 Dec 2011
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Location: Central FL

Re: Heater

Mon Apr 26, 2010 6:59 pm

A heat recovery system like that would have almost certainly added to the cost, weight, or schedule. They figure the bulk of their sales will be in temperate coastal regions.

Here in south Florida home A/C systems are almost exclusively resistance heat. The systems are cheaper initially and are slightly more efficient at cooling than reverse cycle systems. Heat is almost never used here. A couple hundred miles north heat is needed more and reverse cycle is popular.

Weighing just the factors I can speculate over it's easy to see how Nissan arrived at the decision they did.

BTW what is the heat system on the Aptera?
LTL
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KarenRei
Posts: 130
Joined: Fri Apr 23, 2010 2:56 pm

Re: Heater

Mon Apr 26, 2010 7:29 pm

LTLFTcomposite wrote:A heat recovery system like that would have almost certainly added to the cost, weight, or schedule. They figure the bulk of their sales will be in temperate coastal regions.


They have a partnership for launch in DC and TN. Those may not be Minnesota winters, but they're not exactly mild, either.

The systems are cheaper initially and are slightly more efficient at cooling than reverse cycle systems.


If you already have a heat pump (the AC), the difference is a tiny bit of ducting and a couple solenoids. There's practically no COP difference for cooling, but a tremendous one for heating.

darelldd
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Re: Heater

Wed Apr 28, 2010 5:12 pm

Dav wrote:But really, it (the heat pump) was a prototype and only marginally acceptable for any use. Not cold enough air and not warm enough heat.

I guess we can consider the whole car to be a prototype. But I disagree that the HVAC system is only "marginally acceptable for any use." Not by a long shot. A few of us had issues with the HVAC EARLY ON - but when the thing works correctly (as mine does now) it can get both far too hot and far too cold for my comfort. I do live in a mild climate... but then so do millions of people. For them, this system is far from "marginally acceptable!" It actually works amazingly well for how efficient it is.
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Gonewild
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Re: Heater

Wed Apr 28, 2010 6:46 pm

I live in Chandler AZ and it is nice still building more house so I am not sure the population is moving away? I have a Nissan Leaf reserved I pick the SL in black but wanted a mix gray/ brown kinda like coffee in color. The black will look sharp and be hard to keep clean. I ask around some people about black being hotter then a lighter color but most said there was no difference hot is hot in AZ. I am hoping to get to work and back which is about 75 mile.
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