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  • Users: crb7
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  1. crb7

    cooling load calculation bug in Designbuilder Software

    No, because it is floor not a wall.
  2. crb7

    cooling load calculation bug in Designbuilder Software

    Its not thermal mass effect and both set points are the same. I guess surface convection cause this negative load but I dont get the physics behind its calculation . This is the heat gain graph through floor for summer design day. The point is that, air temperature is less than surface...
  3. crb7

    cooling load calculation bug in Designbuilder Software

    Hi I have modeled a 8-storey building in designbuilder software. there is a the problem in its cooling load report; The report indicates heat transfer in middle floors which are located between 2 conditioned spaces. I made the software to ignore thermal mass effect. Is it a bug in the software...
  4. crb7

    pressure regulating landing valve

    hi guys I have a problem with my pressure regulating landing valve.When i close nozzle and open landing valve, the connection will get out the its place: But all of a sudden, in one of the fire cabinets, the air vent open and a little air comes out, then the connection stays in its place...
  5. crb7

    humid weather in basement

    tnx LittleInch and saplanti. The basement is 21 m2 with 3m height so its volume is 63 m3.
  6. crb7

    humid weather in basement

    tnx Compositepro can u help me to choose the right ACH for the room?
  7. crb7

    humid weather in basement

    its not from the weather. i guess both surroundings and room.
  8. crb7

    humid weather in basement

    hi guys i have a problem with my design and i will appreciate if anyone can help me. i have a room in basement, that has high humid weather. its a residential room. is it possible to use exhaust fan for reducing humidity? if yes, how many ACH should i take?
  9. crb7

    detectors in high humidity weather

    tnx guys.
  10. crb7

    salt spray test for fire alarm devices

    hi guys; Is there any approval (like fm ,ul or lpcb) or standard code for salt spray test for fire alarm systems? I live in an island with 85% humidity which seawater causes corrosion in fire alarm devices which have lpcb approvals.
  11. crb7

    detectors in high humidity weather

    hi guys; Which kind of smoke/heat detectors is suggested in high humidity weather? I'm working in an Island which humidity have destructive effects on detectors, and after a period of time make false alarms.
  12. crb7

    fire extinguishers

    tnx UFT12; There is another clause which is said: E.4.6:......For fires in flammable liquids of appreciable depth, a Class B fire extinguisher is provided on the basis of two numerical units of Class B extinguishing potential per 1 ft2 (0.0929 m2) of flammable liquid surface for the largest...
  13. crb7

    fire extinguishers

    hi guys; I have a petroleum factory which is stored flammable liquids in tanks. There is a table in NPFA10 that tell us the fire extinguisher size and placement for class B fire. But also there is paragraph which is said: 6.3.2.3 For flammable liquid hazards of appreciable depth, a Class B...
  14. crb7

    hudrulically pipe sizing

    thank you so much for your precious information.
  15. crb7

    hudrulically pipe sizing

    Thank you Travis Yes I have. I guess you mean chapter 11 of NFPA 13. But I need a solved example to understand the calculations.
  16. crb7

    hudrulically pipe sizing

    hi guys I want to choose pipe sizes for fire sprinkler system. The Hazan-Williams formula have flow rate, pressure loss and pipe diameter. For determining the pipe diameter, the value of flow rate and pressure loss have to be known. We have flow rate from the required flow rate for each...
  17. crb7

    sprinkler above drop ceiling

    tnx UFT12 I guess the clause you mentioned is : A.8.15.1.2.1 Minor quantities of combustible materials such as but not limited to cabling, nonmetallic plumbing piping, nonstructural wood, and so forth can be present in concealed spaces constructed of limited or noncombustible materials but...
  18. crb7

    sprinkler above drop ceiling

    tnx cdafd 8.15.1.2.1* Concealed spaces of noncombustible and limited combustible construction with minimal combustible loading having no access shall not require sprinkler protection. what does "having no access" mean? Drop ceiling usually have access through removing tiles.
  19. crb7

    sprinkler above drop ceiling

    materials of building are steel and concrete. above the drop ceiling are hvac ducts and pipes and electrical cables.
  20. crb7

    sprinkler above drop ceiling

    Hi guys Its about 5 days that Im researching about sprinkler above drop ceiling but I can decide its a mandatory to install sprinkler above drop ceiling or not. In NFPA there are a few clauses about drop ceiling. 8.15.23 Spaces Above Ceilings. 8.15.23.1 Where spaces have ceilings that are lower...

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