Well, then that is different...

As hot as can be safely touched without burning...  based on water=20
temperature recommendations...

125*F =3D burns in 2 minutes (51.7*C)
120*F =3D burns in 10 minutes  (48.8*C)

I'd probably try to keep it under 45*C.... and defintely not over 50*C=20
or so...

-forrest

On 9/15/10 9:20 AM, Mark E. Skeels wrote:
>    This design is a battery charger/discharger and the discharge portion
> of the device will dissipate around 100W-120W with both channels on.
>
> It is designed to give a measure of capacity of battery packs.
>
> The users expect it to handle a relatively high amount of power.
>
> It's not even close to green.   :-)
>
> Mark Skeels
> Engineer
> Competition Electronics, Inc.
> TEL: 815-874-8001
> FAX: 815-874-8181
> www.competitionelectronics.com
>
> On 9/15/2010 10:16 AM, Forrest Christian wrote:
>>     In this day and age, I would think quite a few times about anything
>> which dissipates any amount of heat, since heat is generally a
>> indication that the design isn't very green, which isn't very popular
>> nowadays.
>>
>> Unless you have a good reason for it, and can explain it in a way that
>> makes sense, I would avoid anything which gets much above ambient.   And
>> by 'explain', things like my motorola droid which gets hot when charging
>> plus navigating plus setting in the sun on my dash makes sense.   Or say
>> if you were doing something very computing intensive and it gets hot
>> when you do that - I.E. heat from heavy work is acceptable, heat when
>> idle or under simple tasks is not.
>>
>> -forrest
>>
>> On 9/15/10 7:51 AM, Mark E. Skeels wrote:
>>>      I am working on a consumer product that will be used by people
>>> generally a bit more technically oriented than your average person.
>>>
>>> It dissipates a fair amount of power at times and so it can generate a
>>> fair amount of heat.
>>>
>>> It will be used in a residential, indoors environment......on a table o=
r
>>> a bench.
>>>
>>> My question is this: What is a reasonable/acceptable upper limit for
>>> maximum exterior surface temperature given these circumstances?
>>>
>>> Is there an accepted specification(s) for something like this?
>>>
>>> I am thinking maybe 60 deg C........?

--=20
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