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  1. scythe13

    Gaseous fire suppression system for electronics warehouse?

    I am involved in a project about choosing the best fire suppression system for an electronics warehouse The warehouse area is 1000 Sq M. and the maximum warehouse height is 7.3 M and it's normally occupied. Because the electronics devices stored in that warehouse are of high value, the client...
  2. scythe13

    Spacing of In-rack sprinklers?

    I am involved in a project to design sprinkler system for a warehouse. I have attached the layout of racks. The commodity class is I, II and III and the rack types are double-row without solid shelves. I know that to specify the in-rack sprinkler arrangement I can use Table 16.3.1.1 (from...
  3. scythe13

    Using ireducing elbow 1x1/2 nstead of elbow 1" + reducing coupling 1x1/2 in sprinkler system

    Hi, I am involved in a sprinkler installation project. Currently we are installing sprinklers in the rooms, the pipes size is 1" and the sprinklers are installed above false ceilings, however the client wants the false ceiling height to be as low as possible. As far as I know, to attach a...
  4. scythe13

    HVAC system selection

    Find the attachment!http://files.engineering.com/getfile.aspx?folder=e5cf8085-a771-4df8-965d-a5acc446fe45&file=Christian_Sperber.pdf
  5. scythe13

    HVAC system selection

    317069, There are some reasons behind submetering: -Submetering provides financial incentives to save energy -It's fair for the tenants to be billed based on the energy they consumed. Using a fixed charge is not fair and may cause tension between tenants and landlords
  6. scythe13

    HVAC system selection

    317069, -RT: Room Thermostat -There are ducts for exhaust fans, water pipes, ... but I see no space left for AHU ducts - Exhaust fans are considered for kitchens and bath rooms -Rental Drazen, If all the valves in the system are two-way type, the flow will vary with the load; thereby I can use...
  7. scythe13

    HVAC system selection

    Drazen, yes, I'm aware of the concerns related to VRF. It's also covered in ASHRAE 15. As for energy submetering, I didn't find any info regarding how it's calculated, except for this (which does not explain how it divides the energy consumed by the outdoor unit between tenants): "The...
  8. scythe13

    HVAC system selection

    Hi, I am working on a project to evaluate the HVAC system for a 21 storey residential building. I have attached a typical floor plan which involves Fan Coils layout. As you can see there are no mechanical ventilation system to furnish fresh air is considered. Do you think according to ASHRAE...
  9. scythe13

    The cost effective way for energy submetering?

    Hi, Because heat meters are so expensive, what are the alternative ways to calculate the energy consumption of fan coils? -consider the pipe distribution is horizontal, so by knowing the flow and supply and return temperature I can estimate the energy consumption. -The flow in fan coils are...
  10. scythe13

    Sizing sprinklers cross main

    Thanks for your answer, I want to know is it still correct to keep the size of cross main 2-1/2 and unchanged entire the cross main? I also would appreciate it if you shed some light on the rest of the questions I asked Merci!
  11. scythe13

    Sizing sprinklers cross main

    Hi, I have attached a sprinkler layout from NFPA 13. Can you tell me why the size of cross main after 10 branches has changed from 2-1/2" to 3"? I think in hydraulic calculation, the criteria in sizing main branch is keeping the velocity and pressure in an appropriate range, so the number...
  12. scythe13

    Combined AHU and Fan Coil system for a zone?

    Hi, I have seen in some buildings for a zone there are fan coils as well as AHU system. My question is what percent each system (fan coil and AHU)shares the cooling/heating load of the zone. How do you size fan coil and AHU? Thanks
  13. scythe13

    False Ceiling installation to use ESFR sprinklers?

    Hi, I am performing a basic design for a warehouse (with sloped roof), the dimensions are as follows: Ware House Dimension – Length and Width: 120m x 80m Apex. Height: 19 m Eave Height: 14 m Height Of racks: 12m Type of Racks: 3 rows, the racks are open As it's clear because of ceiling...
  14. scythe13

    Silencer Location? Before or After Fan

    Hi, What are the parameters to select silencer location (before or after fan)? For a commercial building project, there are several AHUs and as I have provided in the attached drawings in some AHUs, silencer is located before the fans and in the other cases it's located after the fans...Can...
  15. scythe13

    What's UL Listed Pressure?

    I'm looking over a fire pump catalog. There is a column that e.g. for a 300 gpm fire pump shows "87-139" UL Listed Pressure (PSI). Do you know what is 87-139? Hereunder is the link for the datasheet: http://www.naffco.com/product.php?prod_id=600&groups_id=252
  16. scythe13

    Pump selection for a hydrant system?

    I see your point, but let's consider a scenario in which the fire sprinklers have been activated and as a result all the estimated fire fighting water flow is devoted to the sprinklers. In this case, the fire pump is unable to furnish hydrants, so do you think the system design is still ok?
  17. scythe13

    Pump selection for a hydrant system?

    I forgot to say that there is not enough city water and as far as Fire Protection is concerned, there will be a need for a Fire Pump(s) as well as a water Storage tank
  18. scythe13

    Pump selection for a hydrant system?

    Thanks for your answer, the project is not in the US, and I used the IFC For now my concern is how to provide water supply for sprinkler system and hydrants (assume the fire flow calculation is correct) Do you think one 1500gpm fire pump is enough to support both systems, or I need to add...
  19. scythe13

    Pump selection for a hydrant system?

    ...flow equals 5000gpm. Because the area is fully sprinkler protected, can I reduce the fire flow by 75%? If so, the needed fire flow will get 5000*0.25=1250gpm Also, for the sprinkler system, I have chosen a 1500gpm @ 9 bar fire pump, so can this pump supply both hydrant and sprinkler system...
  20. scythe13

    How to determine number of alarm check valves?

    yes, all of them are wet systems so, if the system requires say 8 alarm check valves, it also needs 8 fire department connection? And one more question, since each alarm check valve supplies just one zone, can I choose just one "zone control valve assembly of 8" "? Therefore, the system...

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