[EnergyPlus_Support] Re: Total or sensible heat

["eric_zhou1223" <eric_zhou1223@xxxxxxxxx>]

Hi,Mike,

Sorry for the question making you a little puzzled.  

In fact, I will make a test to simulate Human's emitting heat, using 
some electric heaters (and some humidifiers for human emitting 
vapor).
I need to purchase  the  heaters with suitalble heating capcity 
first. So I checked the handbook for the human's emitting heat: 
sensible heat will be 65W, while the latent heat 69W where a male 
has light working at 25C.  Assuming 9 persons in each test cab. 
Should I chose the capacity of electric heater for each room using 
9*65W  or 9*(65+69)W ?

I am not sure if my discription is clear this time..

Besides, the variable "Zone,Sum,Zone Total Internal Total Heat Gain
[J]" can also be splitted to two parts: sensible and latent.  As I 
know , the internal heat gain will bear (or "cancel"?) a part of 
heating load in winter.   When I consider the internal gain's impact 
on the capacity of HVAC equipments, should I focus on the sensible 
part or latent part of the internal gain, or both?


The two questions may be from the same blur conceptual source in my 
knowledge.  I thought the HVAC equipment is sized based on the 
sensible heat always and the latent is just floating 
(uncontrollable) ...

Would you give me some lights on this. Thanks in advance.

Eric


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> I am sorry, but I do not understand the question about the 
electric heater.  
> Are you planning to do a physical (real life) experiment?
> 
> The internal heat gain variables are defined in the Input Output 
Reference (see 
> p. 195, pdf p. 232).  These do not include any heating added by 
the HVAC 
> system.
> 
> Mike
> 
> 
> On 9 Jul 2006 at 12:52, eric_zhou1223 wrote:
> 
> > Hi all,
> > 
> > I am studying the internal gains 's impact on humen comfort by a 
> > small test..
> > The sensible heat and the latent heat emitted by humans can be 
> > evaluated through some empirical values in handbooks.
> > Now I need to decide the size of the electric heater in my 
test.  
> > Should I choose the Total heat value emitted by humans or the 
> > Sensible heat only to make the sizing decision?
> > 
> > It seems I should use Sensible heat to size my electric heater. 
Am I 
> > right?
> > 
> > SOunds like a conceptual issue..
> > 
> > Besides, among "Zone,Sum,Zone Total Internal Total Heat Gain 
> > [J]","Zone,Sum,Zone Total Internal Convective Heat Gain 
> > [J]", "Zone,Sum,Zone Total Internal Radiant Heat Gain [J]" and 
the 
> > summation of the latter two variables, which one can account for 
the 
> > supplementary heating in winter seasons?
> > 
> > I still think the "sensibe" part should be considered as a part 
of 
> > heating ammount,working along with the HVAC equipments, whilst 
> > the "latent" part be ignored since it could not be controlled..
> > 
> > I would appreciate any instructions and help.
> > 
> > Eric
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> > 
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> > 
> > Attachments are not allowed -- please post any files to the 
appropriate folder
> > in the Files area of the Support Web Site.
> > 
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf 
and press the
> > "search" button.
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> >  
> > 
> > 
> > 
> > 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@...
>







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