Test of high-speed shooting with E-M5

Started Jun 13, 2012 | Discussions thread
bobn2
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Re: Personal attacks are easier than constructive criticism
In reply to Rriley, Jun 20, 2012

Rriley wrote:

it doesn't work like that, the whole idea of a 'radiator' was wrong from the beginning,

nope, it is spot on.

and naming it that is wrong.

sure, strictly a 'radiator' on a car is not a 'radiator'

that was exactly what you said it was
Think about how a cooling system on, for instance, a car works.

Yes, well when I asked the reader to 'think' it obviously wan't addressed to you.

and went on to describe a liquid cooling system of a car

indeed. In a car a fluid is circulated around a loop including the head source (engine) and a radiator. the fluid picks up heat from the heat source, travels to the radiator and dumps the heat into the radiator which dissipates it to the environment, either radiatively or convectively.

In peevee's proposed workings of the E-M5 thermal management a fluid circulates in a loop containing a heat source (chips) and a radiator (the metal body of the camera). The fluid picks up heat from the heat source and dumps it to the radiator which dissipates it to the environment, either radiatively or convectively.

heat exchangers are often solid, that doesnt describe a hollow radiator

In this case we have a hollow radiator, because the shell of the E-M5 is hollow, and contains the fluid which is used to transfer the hat from one place to another.

because most of the thermal transfer is convective, but it is accepted terminology.

nonsense, engineering term, heat exchanger.

A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. The media may be separated by a solid wall, so that they never mix, or they may be in direct contact.
http://en.wikipedia.org/wiki/Heat_exchanger

Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating.
http://en.wikipedia.org/wiki/Radiator

Possibly best if you want to have semantic arguments is to know what you are talking about in the first place.

In fact, the E-M5 case will act as more of a radiator, since the convective surface is small, which means that more heat will be lost radiatively in proportion to convectively than something like a car radiator. It's more like a domestic heating radiator in that respect. As peevee points out, the 'hump' will increase the surface area, and thus both radiative and convective heat transfer.

Its a heat exchanger,

a radiator is a heat exchanger.

classic dodgeball

Radiators are heat exchangers

a radiator is a heat exchanger but a heat exchanger is not necessarily a radiator

used to transfer thermal energy from one medium to another for the purpose of cooling and heating
http://en.wikipedia.org/wiki/Radiator

and it would be most unlikely to be hollow, which is what every 'radiator' has ever been.

You think an E-M5 shell is not hollow? Are you proposing that all the gaps are filled? If so this would be a first for a product.

clearly you dont get it

clearly I get it only too well

the challenge is the placement of heat sink, heat exchanger and fan within and without a sealed camera. Think about it

that would be true of the design of ant cooling circuit, but it's always likely that the addition of a pump (fan) to increase the flow rate of the working fluid will increase the rate of heat exchange, and therefore cooling.

Remember radiators also need flow within, necessitating using a pump or convective flow. Convective flow in a hand held device is not really possible.

It's what most hand held devices use. Do you think that your mobile phone has a fan in it? If not, how do you think the heat makes it from the chips to the shell of the phone?

lets put it this way, my cell phone doesnt have a radiator

Does it not? Does not the shell get a little warm and radiate heat into the environment?

it does have heat dissipation considerations, not the same thing

What mechanism do you propose that it uses to lose heat?

Now, where does the 'dedicated heat sink and heat exchanger' transfer the heat to .

ultimately air outside of the camera

Indeed.

Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating.
http://en.wikipedia.org/wiki/Radiator

Sorry, Ray, but you're not doing a lot better than bogus. And you started off so well.
--
Bob

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