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Old 04-21-2021, 04:20 PM   #1 (permalink)
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air conditioning aero drag and heat flux to radiator

* typically, the air conditioning condenser coil is placed upstream of the radiator. It's aerodynamic drag is present whether or not the system is operating, depending upon active thermal management of the cooling system, while at rest, under artificially-induced airflow, or dynamic pressure-induced flow.
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* engine / motor cooling load, battery cooling load, and climate control heat rejection must all be handled by the cooling system.
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* climate control must satisfy full passenger metabolic heat flux, any engine compartment firewall conduction, non-glazed exterior surface heat conduction, and glazed surface, direct solar greenhouse effect and infrared radiation at full-sun, peak Summer heat, at Furnace Creek, Death Valley, California, USA ( typically 120-F ), at 'idle', parked, with all accessories 'ON,' to a specified thermostat setting.
* electric forced-air power consumption must be part of the vehicle's energy accounting.

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Old 04-24-2021, 03:16 AM   #2 (permalink)
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Yes, but what's your point?
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Old 04-28-2021, 10:49 AM   #3 (permalink)
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point

You're kidding, yes?
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Old 04-28-2021, 05:07 PM   #4 (permalink)
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Quote:
Originally Posted by aerohead View Post
You're kidding, yes?
Nope. I am just not sure what it has to do with anything.
  1. The air con condenser causes aero drag.
  2. The air con condenser needs to be cooled.
  3. The air con system has to work when it is hot outside.
  4. An air con condenser fan uses electrical power.

Yes, so what? Everyone knows all that, I would have thought.
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Old 04-28-2021, 05:30 PM   #5 (permalink)
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not sure

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Originally Posted by JulianEdgar View Post
Nope. I am just not sure what it has to do with anything.
  1. The air con condenser causes aero drag.
  2. The air con condenser needs to be cooled.
  3. The air con system has to work when it is hot outside.
  4. An air con condenser fan uses electrical power.

Yes, so what? Everyone knows all that, I would have thought.
I'm sure. Until you're sure, you need to keep thinking about it. Until it clicks.
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Old 04-29-2021, 01:51 AM   #6 (permalink)
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Quote:
Originally Posted by aerohead View Post
I'm sure. Until you're sure, you need to keep thinking about it. Until it clicks.
Well, since no one else has commented, I guess the light bulb hasn't gone on for anyone else either.

In your normal overly complex manner, you're simply stating what is obvious to anyone know knows anything at all about cars:
  • The air con condenser causes aero drag.
  • The air con condenser needs to be cooled.
  • The air con system has to work when it is hot outside.
  • An air con condenser fan uses electrical power.

I guess it's only some kind of breakthrough if you'd never considered these aspects before.
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Old 04-29-2021, 05:19 AM   #7 (permalink)
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The extra drag caused by a condenser is tiny, and I haven't seen anywhere any manufacturer stating an increase in drag by opting for the air conditioning extra. I don't believe it is relevant or beneficial.

There is extra drag caused by the belt, the clutch, the weight of all the components too. And I think they have more of an impact, which is still tiny.

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I'm sure. Until you're sure, you need to keep thinking about it. Until it clicks.
It comes back to the superiority thing I think, aerohead likes to tell us there is something hidden in the data that only aerohead can see. But instead of telling us what he sees, we just get a cryptic keep looking so we can feel inferior to the omniscience.

aerohead, if there is something important that we have all missed, and only you can see, let us know. And preferably, let us know in the first thread post.
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Old 04-30-2021, 12:17 PM   #8 (permalink)
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light bulb

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Originally Posted by JulianEdgar View Post
Well, since no one else has commented, I guess the light bulb hasn't gone on for anyone else either.

In your normal overly complex manner, you're simply stating what is obvious to anyone know knows anything at all about cars:
  • The air con condenser causes aero drag.
  • The air con condenser needs to be cooled.
  • The air con system has to work when it is hot outside.
  • An air con condenser fan uses electrical power.

I guess it's only some kind of breakthrough if you'd never considered these aspects before.
Light bulb ( incandescent anyway) is an okay metaphor.
If any passenger emits 300 Btu / hour, metabolic cooling load, and four no longer equals seven, then we finally have a context with which to compare a 911 Carrera to a Model S, cooling-wise.
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Old 04-30-2021, 12:21 PM   #9 (permalink)
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something

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Originally Posted by AeroMcAeroFace View Post
The extra drag caused by a condenser is tiny, and I haven't seen anywhere any manufacturer stating an increase in drag by opting for the air conditioning extra. I don't believe it is relevant or beneficial.

There is extra drag caused by the belt, the clutch, the weight of all the components too. And I think they have more of an impact, which is still tiny.



It comes back to the superiority thing I think, aerohead likes to tell us there is something hidden in the data that only aerohead can see. But instead of telling us what he sees, we just get a cryptic keep looking so we can feel inferior to the omniscience.

aerohead, if there is something important that we have all missed, and only you can see, let us know. And preferably, let us know in the first thread post.
please reread the 3rd paragraph @ #1 permalink, and then #8 permalink
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Old 04-30-2021, 04:47 PM   #10 (permalink)
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Quote:
Originally Posted by aerohead View Post
please reread the 3rd paragraph @ #1 permalink, and then #8 permalink
Given that your theories are often quite strange - some would call them bizarre - it helps if you explain what you're actually trying to postulate.

As has been pointed out, you haven't done so - and so telling us to re-read what you've written is not much help.

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