[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Passive cooling



For your consideration....
  • I have had conversations with people who live in such hot, humid climates and it seems that "comfort" is defined differently than in much of North America where I live. If comfort is acceptable at 30C and 50% RH, for example, then the HVAC design becomes different.
  • While the mass of the building envelope may be small for a factory, the manufacturing equipment, storage racking and floor can add to that substantially.  This mean that nighttime pre-cooling may become effective.
  • There are exceptionally efficient indirect evaporative systems which add no moisture and may help keep mold growth low. (e.g., www.coolerado.com)
  • Reducing solar gain via insulation or a reflective surface will be a helpful strategy for a large roof.



On Sat, Feb 20, 2016 at 4:43 AM, Sajal Chowdhury sajal_c@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Dear Jean,
What about Cross ventilation , Displacement ventilation, Mixing ventilation and Fan system for factory large production space in Tropics? Need discussion. Thank you in advance. 
 
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: sajal_c@xxxxxxxxx


On Saturday, February 20, 2016 3:47 PM, Sajal Chowdhury <sajal_c@xxxxxxxxx> wrote:


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



On Saturday, February 20, 2016 10:00 AM, "Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:


 
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 sajal_c@xxxxxxxxx [EnergyPlus_Support]" <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: sajal_c@xxxxxxxxx


On Friday, February 19, 2016 2:35 PM, "Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:


 
You should list several options so that we can discuss them.
On 18 Feb 2016 1:23 pm, "Sajal Chowdhury sajal_c@xxxxxxxxx [EnergyPlus_Support]" <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: sajal_c@xxxxxxxxx









--

James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct: 616.450.8653
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx

Website l  LinkedIn

Genius is nice, but consistency trumps genius every time



__._,_.___
Posted by: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.



Visit Your Group
Yahoo! Groups
• Privacy • Unsubscribe • Terms of Use

__,_._,___