[Bldg-sim] How to model floor using aluminium foil to prevent heat transfer?

[Chris]

A radiant floor performs vastly different to hydronic baseboards and that
workaround is not a valid approach in my opinion. Having an understanding of
the physics involved in the performance of radiant slabs and their influence
on space heating is essential before any modeling takes palce.

On Thu, Apr 14, 2011 at 09:40, Shubha Mohunta <shubha.mohunta at gmail.com>wrote:

> Thanks Cheney,
>
> This project uses Heat pumps for cooling and radiant floors for heating. So
> to model this i have used Heat pumps ( with just cooling) as my primary
> system and attached baseboards to them to simulate radiant floors.
>
> Do u think this would work?
>
> Shubha
>
> On Tue, Apr 12, 2011 at 4:53 PM, Cheney <chenyu73 at gmail.com> wrote:
>
>> Hi,
>>
>> I doubt you are able to simulate it by using eQuest. However, it is
>> possible to simulate it in IES VE (I guess TAS and Energy+ can do the same
>> thing). Radiant floor can be simulated by 1. top concrete (e.g. 2" of
>> concrete); 2. radiant piping zone; 3. floor assembly below the radiant
>> piping. For your case, reflectivity, emiissivity (probably conductivity)
>> should be modified accordingly between layer 2 and 3.
>>
>> Regards,
>>
>> Cheney
>>
>> LinkedIN @ http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b
>>
>>
>>
>>   On Tue, Apr 12, 2011 at 12:02 PM, Shubha Mohunta <
>> shubha.mohunta at gmail.com> wrote:
>>
>>>   Hi,
>>>
>>> The building i am modeling has steel frame floor which separates the
>>> conditioned space from unconditioned basement. There are hot water tubes
>>> running underneath between the steel joists for radiant heating. There is no
>>> use of insulation except for v thin aluminium foil below radiant tubes which
>>> is fixed to the steel joists using magnets. This foil helps with high
>>> reflectivity and low thermal absorption prevents heat transfer to the
>>> unconditioned basement.
>>>
>>> Can somebody give me ideas how to model this ? I am using eQUEST
>>>
>>> Thanks,
>>>
>>> Regards,
>>>
>>> Shubha Mohunta, LEED Green Assoc.
>>> M.S. Sustainable Design
>>> Carnegie Mellon University
>>>
>>>
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>>
>
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-- 
Chris Flood BSc (Eng)
Senior Building Analyst
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