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Re: [EnergyPlus_Support] Passive cooling


Dear Jean,
Thanks for your detailing. But is it feasible to implement any HVAC system for such a large open space? What about the matter of energy efficiency and cost effectiveness? Cross ventilation and face change materials does not work many times for the huge depth of the factory floor. But in production floor we have to keep comfort temperature range as result we need some cooling strategies so that we can apply for tropical climate. According to your reply, Displacement ventilation often works well due to the high ceiling and one of the common strategy for factory. But we observe may garments factory in the tropics (Bangladesh) using evaporation cooling but as you already told about Microbial growth. On the other hand in tropical climate if we minimize window and door, it will be no good enough. In this case, what is the best decision or research topic about passive cooling strategy for garments factory by using Energy Plus simulation engine (professor recommended) .   
Regards,  
Sajal Chowdhury




A factory in the tropics...look you're gonna need some serious cooling...nothing passive about that. You have seriously hot and humid air so I would try and minimize the outdoor air in the air supply...even at night.
Passively speaking:
What you could consider is some sort of load shedding. Large tanks full of chilled water that you charge at night when electricity is cheaper and outdoor temperatures are lower.
I would insulate heavily, minimize windows and doors and forget about daylighting.
Try pull the heat away from the processes and other heat sources before they enter the work space (direct exhaust).
Put PV on the whole roof.
I would rather dehumidify less and not use radiant cooling, than the otherway around.
Night cooling...yes if you have a heavy structure (unusual for factory), but not night outdoor air flushing if humidity is a problem.
Displacement ventilation often works well due to the high ceiling. Common strategy for factory.
Direct and indirect evaporation: bottom line...keep your loops closed. Microbial growth will be more problematic in a hot humid climate. Evaporation rates in a humid climate are possibly less than a warm and dry climate.
Solar heating.
On 19 Feb 2016 6:41 am, "Sajal Chowdhury <mailto:sajal_c@xxxxxxxxx>sajal_c@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>  
Dear Jean,
Thank you for reply.
> The options are:
1. cross ventilation
> 2. desiccant humidification
> 3. direct evaporation cooling
> 4. indirect evaporation cooling
> 5. displacement ventilation
6. radiative cooling
7. nocturnal ventilation
> So among them Which cooling technique is more efficient for large factory production space (for tropical climate and min 500 nos people work) regarding energy efficiency?
>  
Sajal Chowdhury
> B.Arch.(BUET), M.Arch.(BUET), M.Eng.(HU,Japan)C.
> Assistant Professor, Dept. of Architecture (Study Leave)
> Chittagong University of Engineering & Technology Chittagong 4349, Bangladesh
> Present Address:
> Laboratory of Environmental Ergonomics
> (Planning and Performances for Built Environment)
> Division of Human Environmental Systems
> Graduate School of Engineering
> Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JAPAN
> Mobile(P): +818096126951, E-MAIL: <mailto:sajal_c@xxxxxxxxx>sajal_c@xxxxxxxxx
> 
> 
> On Friday, February 19, 2016 2:35 PM, "Jean Marais <mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
> 
> 
>  
You should list several options so that we can discuss them.
On 18 Feb 2016 1:23 pm, "Sajal Chowdhury <mailto:sajal_c@xxxxxxxxx>sajal_c@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>>  
Dear All,
Can anybody help me regarding the issue on:
**Which passive cooling technique is more efficient for large factory production space (for tropical climate and min 500 nos people work) regarding energy efficiency? If anybody do this kind of simulation by using Energy Plus need some suggestions and feedback.
Thank you.  
Best Wishes, 
>> Sajal Chowdhury
>> B.Arch.(BUET), M.Arch.(BUET), M.Eng.(HU,Japan)C.
>> Assistant Professor, Dept. of Architecture (Study Leave)
>> Chittagong University of Engineering & Technology Chittagong 4349, Bangladesh
>> Present Address:
>> Laboratory of Environmental Ergonomics
>> (Planning and Performances for Built Environment)
>> Division of Human Environmental Systems
>> Graduate School of Engineering
>> Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JAPAN
>> Mobile(P): +818096126951, E-MAIL: <mailto:sajal_c@xxxxxxxxx>sajal_c@xxxxxxxxx
> 
> 





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 Posted by: Sajal Chowdhury <sajal_c@xxxxxxxxx>

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